CN110596343A - Research method for carbon reserves of forest soil - Google Patents
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Abstract
The invention discloses a method for researching forest soil carbon reserves, which comprises the following steps: s1. surveying the coastal terraces of multiple areas and establishing sample plot; s2, collecting a soil sample from the soil profile excavated in the sample plot or in the extension, and analyzing and determining the physical properties, the chemical properties and the biological properties of the forest soil; s3. researching the existing carbon characteristics, root biomass stock carbon characteristics and microorganism morphological carbon of the litter of each level of soil; s4. obtaining forest carbon accumulation characteristics by researching the distribution state and stock characteristics of the main forest type soil carbon of the coastal plateau; s5. estimating and researching the carbon reserves of the soil of the main forest type in the area; the method of the invention obtains accurate data through sample plot actual measurement to analyze the distribution rule and the relation between the distribution rule and the environmental variable, is helpful for discussing the ecological function of the artificial forest soil of the coastal plateau, and has important significance for the sustainable management of the coastal plateau and the recovery of the forest productivity.
Description
Technical Field
The invention belongs to the field of research on carbon reserves of forest soil, and particularly relates to a method for researching the carbon reserves of the forest soil.
Background
In recent years, the problem of carbon reserves has increasingly become a leading edge and a hot spot in the fields of global changes and research of geoscience. Soil is the core of the terrestrial ecosystem, and the research on carbon cycle and carbon accumulation of soil is one of the hot contents of the carbon cycle of the current terrestrial ecosystem and the research on global change. The reserve of the soil carbon reservoir reflects the carbon fixation capacity of a soil system, the reserve and the spatial distribution of the soil carbon reservoir are determined, the method is a foundation for researching the carbon cycle of a land ecosystem, is an important means for researching the greenhouse gas flux and the carbon cycle balance calculation between soil and atmosphere, and is a foundation for establishing a soil carbon reservoir list, evaluating the historical shortage or surplus of the soil carbon reservoir list and predicting the soil carbon fixation potential. The forest ecosystem plays an important role in carbon cycle as a main body of a terrestrial biosphere, not only maintains a large amount of carbon reservoirs (about more than 86% of the global vegetation carbon reservoir) by itself, but also maintains a huge soil carbon reservoir (about 73% of the global soil carbon reservoir) (POETWM and the like), and the change of the carbon reservoirs is considered as a main cause of atmospheric carbon reservoir and global climate change and shows a huge carbon sink effect.
The Hainan province is the only province in all tropical zones in China, and tropical forest ecosystems including tropical rain forests, seasonal rain forests and the like become the most key and most core components in the forest ecosystems in China due to abundant species diversity, complex community structures and extremely high productivity. In recent years, researches on carbon balance of forest ecosystems are carried out successively, for example, the study on the existing quantity and water retention characteristics of 3 forest litter in Hainan and the like is carried out by Weiwei and the like, and the researches are carried out to the space-time pattern of biomass and carbon storage of an artificial forest of Hainan eucalyptus such as Yangzhou and the like, the initial exploration of easily-oxidized organic carbon and light group carbon content of the artificial lawn soil of Hainan such as Xiaodong and the like. The determination of different forest type litters and carbon reserves in different areas provides basic data for our province to evaluate the carbon sink/carbon source capacity of the corresponding forest type soil ecosystem. But the research on the carbon reserves of different types of forest soil of coastal plateau of the Hainan island is lacked. By recognizing the organic carbon components of the forest soil and researching the dynamic change of the components and the mutual dynamic change of the components, the space-time dynamics of the organic carbon reservoirs of the forest soils of different types are discussed, and a reference is provided for accurately evaluating the carbon absorption capacity and the absorption potential of the forest soil of the coastal plateau of our province, predicting and maintaining the long-term productivity of the ecological system of the artificial forest, guiding the sustainable management and the reconstruction of the artificial forest and laying a foundation for researching the carbon cycle of the ecological system of the coastal plateau of Hainan province and even the global carbon balance.
Disclosure of Invention
The purpose of the invention is: accurate data are obtained through sample plot actual measurement to analyze the distribution rule and the relation between the distribution rule and environmental variables, so that the method is beneficial to discussing the ecological function of the artificial forest soil of the coastal plateau and has important significance for the sustainable management of the coastal plateau forest land and the recovery of the forest land productivity.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows: a method for researching forest soil carbon reserves comprises the following steps:
s1. surveying the coastal terraces of multiple regions by route survey and field sample survey, selecting different forest types of representative regions to establish sample plots for the survey objects;
s2, collecting a soil sample from the soil profile excavated in the sample plot or in the extension, analyzing and determining the physical property, the chemical property and the biological property of the forest soil, and obtaining the current soil fertility and the current soil fertility trend of different forest types of the coastal terrace;
s3., existing carbon characteristics, root biomass storage carbon characteristics and microorganism form carbon of litter at each level of soil are researched, and the current situation and the pattern of the carbon density of soil of various forest types of the coastal plateau are further obtained;
s4. obtaining variation range of soil carbon of each forest type by researching distribution state and stock characteristics of soil carbon of main forest types of the coastal plateau; through the fixed-point and fixed-time observation of the years, the annual conversion characteristics of the carbon with various components are obtained, and the accumulation characteristics of the forest carbon are obtained;
s5. an estimation study was conducted on the carbon reserves of the forest type soils that predominate in the area.
Further, in step s1, 5 forest types including coconut forest, casuard forest, thinking forest, eucalyptus forest and rural secondary forest are used as survey objects and sample plots are established, cement piles or PVC pipes are used for marking each sample plot, coordinate information of the sample plot is recorded through a handheld GPS positioning device, and then plants in the sample plot are surveyed.
Further, step s2 specifically includes:
s21, measuring and analyzing the volume weight of the soil of different soil layer depths of various forest types;
s22, sampling and analyzing various types of forest soil, and determining the content of organic carbon in the soil profile;
s23, analyzing the soil fertility of various types of forests;
and S24, analyzing the relation between the forest soil organic carbon and the soil factor of the coastal plateau.
Further, step s3 specifically includes:
s31, comparing and analyzing the carbon content of the root system, the carbon density of the root system and the carbon reserve of the root system of 0-40cm in the forest;
and S32, carrying out comparative analysis on the carbon content of the forest litter, the carbon density of the forest litter and the carbon reserve of the forest litter.
Further, in step s21, when performing the profile soil volume weight analysis, the soil volume weight of each soil layer depth of each forest type is measured and analyzed, so as to obtain the variation trend of the soil volume weight with the soil depth.
Further, in step s22, when performing the profile soil organic carbon distribution analysis, statistical analysis is performed on the organic carbon content of each soil layer depth of each forest type, so as to obtain the significance of the statistical difference between the organic carbon content of each forest type and the soil layer depth.
Further, in step s23, correlation analysis is performed on the organic carbon content of different types of forest soil and the corresponding soil total nitrogen, soil total phosphorus, soil quick-acting potassium and soil ammonium nitrogen content.
Drawings
FIG. 1 is a study flow chart of the present invention;
FIGS. 2(a) - (e) are schematic diagrams of the soil volume weights of Ephedra sinica, Secondary forest, coconut, Eucalyptus and acacia, respectively, in the coastal plateau of Hainan;
FIGS. 3(a) - (d) are graphs for analyzing the correlation between organic carbon in forest soil and total nitrogen, total phosphorus, quick-acting potassium and ammonium nitrogen in coastal plateau of Hainan coast, respectively;
FIGS. 4(a) - (f) are graphs comparing the carbon content of the root system, the carbon density of the root system, the carbon reserves of the root system, the carbon content of the litter, the carbon density of the litter, and the carbon reserves of the litter, respectively, of 5 forest types of coastal plateau in Hainan province.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following embodiments are provided to further illustrate the present invention.
The method for researching the carbon reserve of the forest soil comprises the following steps:
s1. developing vegetation surveys of different forest types
The method comprises the steps of surveying 12 city-county coastal terraces by adopting a route survey method and a field sample survey method, finally selecting representative 4 city-county (Wenchang, Lingaoydong and Wanning) Hainan island coastal terraces from the 12 city-county coastal terraces, wherein different forest types (mainly comprising 5 forest types such as coconut forest, casuarina equisetifolia forest, thinking forest, eucalyptus forest, rural secondary forest and the like) are taken as survey objects, establishing sample plots, and marking each sample plot by adopting a cement boundary pillar or a PVC pipe. Coordinate information of a sample plot is recorded through a handheld GPS, and then the plants in the sample plot are investigated to know the relation between vegetation characteristics and soil carbon storage characteristics.
S2, researching physical, chemical and biological characteristics of different types of forest soil
And collecting a soil sample from the built in-sample plot or the developed soil profile, analyzing and measuring the physical properties, chemical properties (organic matters, pH value, total nitrogen, phosphorus, potassium, calcium, magnesium, quick-acting nitrogen, phosphorus, potassium, magnesium and the like) and biological properties of the forest soil to reveal the current situation and trend of the soil fertility of different forest types of the coastal plateau, provide scientific basis for sustainable operation of the forest and clarify the relationship between the soil properties and the carbon storage characteristics.
S21, analyzing the volume weight of the profile soil
Selecting 5 forest types such as casuarina equisetifolia, secondary forest, coconut tree, eucalyptus and acacia from 4 city counties such as Wenchang, Lingao, Ledong and Wanning among 12 city counties, and excavating 20 soil sections of 100cm in total. Wherein casuarina equisetifolia excavates 4 soil sections, 4 secondary forests, 4 coconuts, 4 eucalyptuses and 4 acacia. Soil bulk densities at different soil depths were determined and analyzed and the results are shown in FIGS. 2(a) - (e). Wherein the volume weight of the 0-100cm soil layer of the casuarina is between 1.34 and 1.39g/cm 3. The surface soil volume weight is the largest, and the surface soil volume weight is approximately reduced along with the increase of the soil depth; the soil layer unit weight of 0-100cm of the secondary forest is 1.48-1.57g/cm 3. The volume weight of the soil gradually increases along with the increase of the depth of the soil; the soil layer volume weight of the coconut forest of 0-100cm is between 1.39-1.57g/cm 3. The surface soil volume weight is minimum, and the volume weight of the soil gradually increases along with the increase of the soil depth; the volume weight of the soil layer of 0-100cm of the eucalyptus forest is 1.36-1.43g/cm 3. The volume weight of the soil shows a trend of increasing firstly and then decreasing on a section; the volume weight of 0-100cm soil layer of the phasian is 1.31-1.37g/cm 3. The change trend of the volume weight of the soil on the section is generally consistent with that of eucalyptus forest.
S22, analyzing organic carbon distribution of profile soil
TABLE 1 comparison of forest soil organic carbon content in coastal plateau of Hainan area/(g/kg)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The 5 types of forest soil in Hainan were sampled and analyzed, and the organic carbon content in the soil profile was determined (see Table 1). The organic carbon content of 5 forest soils in Hainan is 1.79-10.6g/kg, and the forest soils belong to the soil with low organic carbon content and have larger variation. The organic carbon content of 5 kinds of forest soil has obvious vertical distribution in the soil profile and is in a decreasing trend along with the increase of the soil depth. The content of organic carbon in the soil of 0-100cm of casuarina is 2.14-6.46 g/kg; the secondary forest is between 3.62 and 10.6 g/kg; the coconut forest is between 1.79 and 6.13 g/kg; the eucalyptus forest is between 3.32 and 8.83 g/kg; phasianoline is between 3.31-7.98 g/kg. Statistical analysis is carried out on the organic carbon content of different soil layers of different forests, and the results show that the organic carbon content of the soil in the soil layers of 0-10cm, 10-20cm and 60-100cm of 5 forests is not remarkably different statistically. The organic carbon content difference in soil layers of 20-40cm of 5 types of forests is obvious (P is less than 0.05), wherein the acacia forest is the highest, the eucalyptus forest, the secondary forest and the casuarina equisetifolia are the second, and the coconut forest is the lowest. The organic carbon content difference in soil layers of 40-60cm of 5 types of forests is obvious (P is less than 0.05), and the organic carbon content difference is also highest in terms of acacia forest, inferior in terms of eucalyptus forest, secondary forest and casuarina, and lowest in terms of coconut forest.
S23, analyzing the soil fertility of different forest types
TABLE 2 comparison of forest soil pH in coastal plateau of Hainan province
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The pH of the forest soil of the coastal plateau of Hainan is between 5.14 and 6.62 (Table 2). Wherein the soil pH of the casuarina equisetifolia is between 6.10 and 6.55 and is faintly acid soil, and the soil pH is 0 to 100 cm; the pH value of 0-100cm soil of the secondary forest is 5.17-5.56, and the secondary forest belongs to strong acid soil; the pH value of the 0-100cm soil of the coconut forest is 6.42-6.62, and the coconut forest belongs to weakly acidic soil; the pH value of the eucalyptus forest soil of 0-100cm is 5.41-5.93, and the eucalyptus forest belongs to acid soil; the pH value of the 0-100cm soil of the phasiancholia is between 5.14-5.20, and the phasiancholia belongs to strong acid soil; for topsoil (0-10cm), the difference in pH was significant for 5 forest soils (P < 0.05). The pH value of the soil on the surface layers of the coconut forest and the casuarina equisetifolia is obviously higher than that of the soil on the surface layers of other 3 forests.
TABLE 3 comparison of forest soil total nitrogen in coastal plateau of Hainan area/(g/kg)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
A comparison of the total nitrogen in forest soil of coastal plateau in Hainan is shown in Table 3. The total nitrogen of 5 forest soils in the coastal plateau of Hainan is between 0.20 and 1.04g/kg, and basically belongs to low-nitrogen fertility soil. The total nitrogen content of 5 kinds of forest soil has obvious vertical distribution in the soil profile, and the total nitrogen content of the forest soil is reduced along with the increase of the soil depth. Wherein the total nitrogen of the casuarina 0-100cm soil is between 0.20-0.54g/kg, and belongs to low-nitrogen fertility soil; the total nitrogen of 0-100cm soil of the secondary forest is 0.42-1.04g/kg, and the nitrogen fertility of other soil layers except a top soil layer (0-10cm) is still not high; the total nitrogen of the 0-100cm soil of the coconut forest is between 0.23 and 0.55g/kg, and the soil nitrogen fertility is low; the total nitrogen of the eucalyptus forest 0-100cm soil is between 0.34-0.68g/kg, and the soil nitrogen fertility is low; the total nitrogen of 0-100cm of phasianchun soil is 0.36-0.76g/kg, and the nitrogen fertility of the soil is not high. The difference between the total nitrogen contents of 5 forest surface soil (0-10cm) is obvious (P is less than 0.05), wherein the total nitrogen of the secondary forest surface soil is obviously higher than that of casuarina equisetifolia and coconut forest.
TABLE 4 comparison of Total phosphorus in Hainan coastal plateau forest soil%
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
TABLE 5 comparison of Total Potassium content of forest soil from Hainan coastal plateau%
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The total phosphorus content of 5 forest soils in coastal terraces of Hainan is between 0.03 and 0.09 percent and basically does not exceed 0.1 percent (Table 4). The statistical analysis result shows that the difference between the total phosphorus contents of the 5 kinds of forest soil is not large. The total potassium content of 5 forest soils in coastal terraces of Hainan is 0.65-1.60%, and mostly between four and five grades (Table 5). Except surface soil (0-10cm) and deep soil (60-100cm), the total potassium content of other soil layers of 5 kinds of forest soil is remarkably different (P is less than 0.05). Basically, secondary forests are the highest, and casuarina equisetifolia is the lowest.
TABLE 6 comparison of available phosphorus in forest soil of coastal plateau in Hainan area/(mg/kg)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The effective phosphorus content of 5 forest soils in coastal terraces of Hainan varies greatly between 2.33-167.76mg/kg (Table 6). The profile of the soil is basically reduced along with the increase of the depth of the soil. Wherein the soil effective phosphorus of the casuarina 0-100cm is between 13.28-86.40mg/kg, and the content of the effective phosphorus is rich; the soil 0-100cm of the secondary forest has available phosphorus of 19.71-29.78mg/kg and rich content of available phosphorus; the content of available phosphorus in 0-100cm soil of the coconut forest is 27.12-167.76mg/kg, and the content of available phosphorus is rich; the effective phosphorus content in the eucalyptus forest soil of 0-100cm is 2.33-4.56mg/kg, and the effective phosphorus content is low; the soil with 0-100cm of phasiandra has effective phosphorus content of 2.58-4.96mg/kg and low effective phosphorus content. The difference between the effective phosphorus contents of the soil with 40-100cm of 5 kinds of forests is small. And the difference of the available phosphorus of the soil with the depth of 0-40cm is obvious (P is less than 0.05), and the difference is basically highest in coconut forest and lowest in eucalyptus forest and acacia forest.
TABLE 7 comparison of fast-acting Potassium in forest soil of coastal plateau of Hainan area/(mg/kg)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The quick-acting potassium content of 5 forest soils in coastal terraces in Hainan province is between 4.85 and 74.49mg/kg, and the variation is large (Table 7). The content change of the soil conditioner also approximately shows a trend of decreasing with the increase of the soil depth in the soil profile. Wherein the fast-acting potassium in the soil with the concentration of 0-100cm of casuarina is 4.85-12.45mg/kg, and the content of the fast-acting potassium is low; the soil quick-acting potassium of 0-100cm of the secondary forest is between 27.66-39.42mg/kg, and the quick-acting potassium content is lower; the content of the quick-acting potassium in the 0-100cm soil of the coconut forest is 23.73-74.49mg/kg, and the content of the quick-acting potassium is medium; the fast-acting potassium in the eucalyptus forest 0-100cm soil is 9.06-19.19mg/kg, and the content of the fast-acting potassium is low; the soil quick-acting potassium of 0-100cm of phasianoline is 20.41-42.07mg/kg, and the quick-acting potassium content is low. The difference of the quick-acting potassium contents of the soil in different soil layers of 5 forests is obvious (P is less than 0.05), the content of the quick-acting potassium is approximately the highest in coconut forest and secondary forest, and the content of casuarina equisetifolia and eucalyptus forest is the lowest.
TABLE 8 comparison of nitrate Nitrogen in forest soil of coastal plateau in Hainan area/(mg/kg)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The nitrate nitrogen content of 5 forest soils in coastal terraces of Hainan is 0.86-7.97mg/kg (Table 8). The content of nitrate nitrogen in the soil of 0-100cm of casuarina is 0.86-3.00 mg/kg; the content of nitrate nitrogen in 0-100cm soil of the secondary forest is 1.64-4.69 mg/kg; the content of the nitrate nitrogen in the soil of 0-100cm of the coconut forest is 1.00-5.68 mg/kg; the content of nitrate nitrogen in the soil of 0-100cm of the eucalyptus forest is 1.18-2.54 mg/kg; the content of nitrate nitrogen in 0-100cm soil of the phasiacolin is 1.70-7.97 mg/kg. Roughly highest in phasianchun, lowest in casuarina and eucalyptol.
TABLE 9 comparison of forest ammonium Nitrogen in coastal plateau of Hainan area/(mg/kg)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The content of the ammonium nitrogen in 5 forest soils of coastal terraces in Hainan province is between 2.43 and 9.89mg/kg (Table 9). The content of the casuarina equisetifolia 0-100cm soil ammonium nitrogen is between 2.43-5.38 mg/kg; the content of ammonium nitrogen in 0-100cm soil of the secondary forest is 5.83-8.54 mg/kg; the content of the coconut forest 0-100cm soil ammonium nitrogen is 3.67-5.27 mg/kg; the content of ammonium nitrogen in the soil of 0-100cm of the eucalyptus forest is 5.51-6.24 mg/kg; the content of the ammonium nitrogen in the 0-100cm soil of the phasiacolin is between 5.23 and 9.89 mg/kg. The content of the ammonium nitrogen in the soil on the surface layer (0-10cm) of 5 kinds of forests has no obvious difference. The content of ammonium nitrogen in soil of other soil layers is approximately highest in thinking forest, secondary forest and eucalyptus forest, and the content of casuarina is lowest.
And s24, analyzing the relation between the organic carbon of the forest soil of the coastal plateau of Hainan province and the soil factor
Performing correlation analysis on the organic carbon content and the corresponding soil total nitrogen content of 5 forest soils (fig. 3(a) - (d)), and finding that the organic carbon content and the corresponding soil total nitrogen content are in extremely obvious positive correlation (r is 0.761 x, and P is 0.01), which indicates that the forest soil organic carbon and the soil total nitrogen of the coastal plateau have good positive correlation; carrying out correlation analysis on the organic carbon content of 5 types of forest soil and the corresponding soil total phosphorus content, and finding that the organic carbon content and the corresponding soil total phosphorus content are in extremely obvious positive correlation (r is 0.360 x, and P is 0.01), which indicates that the forest soil organic carbon of the coastal plateau and the soil total phosphorus have very good positive correlation; carrying out correlation analysis on the organic carbon content of 5 forest soils and the corresponding quick-acting soil potassium content, and finding that the organic carbon content and the corresponding quick-acting soil potassium content are in extremely obvious positive correlation (r is 0.329 x and P is 0.01), thereby indicating that the forest soil organic carbon of the coastal plateau and the quick-acting soil potassium have very good positive correlation; correlation analysis is carried out on the organic carbon content and the corresponding soil ammonium nitrogen content of 5 forest soils, and the organic carbon content and the corresponding soil ammonium nitrogen content are found to be in a very significant positive correlation (r is 0.245 and P is 0.01), which indicates that the forest soil organic carbon and the soil ammonium nitrogen content of the coastal plateau have a very good positive correlation.
s3. research on the existing carbon characteristics of litter, the carbon characteristics of root system biomass stock and the carbon of microorganism morphology
By researching carbon components of various forms of soil in each level, such as litter including root systems, soil organic carbon and soil microbial carbon, the current situation and the pattern of the carbon density of soil of various forest types in the coastal plateau of the southeast Hainan island are known, and a basis is provided for further estimation of the soil carbon reserve.
The carbon content of 0-40cm root system of the coast forest of Hainan province (figure 4a), the carbon density of the root system (figure 4b) and the carbon reserve of the root system (figure 4c) are compared and analyzed. The results show that the carbon content of the root systems of 5 forests is between 442.12 and 486.57g/kg, wherein the carbon content of the root system of casuarina equisetifolia is the highest, and the carbon content of the root system of the secondary forest is the lowest (P < 0.05). The carbon density of the 5 forest roots is between 0.03 and 0.05kg/m2, and the difference is not obvious. The carbon reserves of the root systems of the 5 kinds of forests are between 0.29 and 0.47t/hm2, and the difference is not obvious.
Comparative analysis was performed on the litters carbon content (fig. 4d), the litters carbon density (fig. 4e) and the litters carbon reserves (fig. 4f) of the forest of the coastal plateau of Hainan. The results show that the carbon content of 5 forest litter is between 384.13-477.55g/kg, wherein the secondary forest litter is significantly lower than other forests (P < 0.05). The carbon density of 5 forest litter is 0.05-0.33kg/m2, with casuarina and eucalyptus forests being the highest and coconut forests being the lowest. The carbon reserves of 5 forest litter are between 0.53 and 3.26t/hm2, and are also highest in casuarina and eucalyptus forests and lowest in coconut forest.
s4. research on organic carbon density and carbon accumulation characteristics of different forest types of soil
The distribution state and the stock characteristics of the main forest type soil carbon of the coastal plateau of the Hainan island are clarified through research, and the variation amplitude of the soil carbon of each forest type is obtained. Through the fixed-point and fixed-time annual observation, the annual conversion characteristics of the carbon with various components are obtained, the accumulation characteristics of the forest carbon are obtained, and a scientific basis is provided for large-area estimation of the soil carbon.
TABLE 10 comparison of organic carbon Density/(kg/m) of forest soils from coastal plateau in Hainan area2)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The organic carbon densities of 5 forest soils in the coastal plateau of Hainan were compared and are shown in Table 10. From the view point of the carbon density of the profile soil, the organic carbon density of the soil on the surface layer (0-10cm) of 5 forests is between 0.79 and 1.47kg/m2The secondary forest is highest, the eucalyptus forest, the juncus forest and the coconut forest are centered, and the casuarina is lowest. There is no significant difference between forests with different carbon densities in other soil layers. 0-100cm soil of 5 kinds of forestThe density of the organic carbon is between 3.57 and 6.00kg/m2The difference between them is not significant and the variation is large. Research shows that (Yanghi et al, 2016), Hainan peak Ling, Bawangling and other 5 main tropical original forests with the soil organic carbon density of 0-100cm is 14.98-18.46kg/m2. Therefore, the organic carbon density of the 5 forest soils in the coastal terraces is far lower than that of the original forest soil in the area.
s5. estimation research of carbon reserves of main forest type soil
The organic carbon reservoir of the forest soil is an important component of global carbon cycle, the change of accumulation and decomposition of the organic carbon reservoir directly influences global carbon balance, the research of the organic carbon reservoir of the forest soil accurately estimates soil carbon accumulation, reflects soil fertility and has very important practical significance for biological growth and estimation of the carbon sequestration capacity of the forest in Hainan island.
TABLE 11 comparison of forest soil organic carbon reserves/t/hm of Hainan coastal plateau2)
Note: different lower case letters after the same row of data indicate significant difference (P < 0.05).
The organic carbon reserves of 5 forest soils in coastal plateau of Hainan were compared and shown in Table 11. From the view of the carbon reserve of the profile soil, the organic carbon reserve of the soil with 5 forest surface layers (0-10cm) is between 7.9 and 14.67t/hm2The secondary forest is highest, the eucalyptus, phasiancholia and coconut forests are centered, and the casuarina is lowest (P)<0.05). There is no significant difference between other forests with different carbon reserves in the soil layers. The organic carbon reserve of 0-100cm soil of 5 kinds of forest is 35.68-60.01kg/m2The difference between them is not significant and the variation is large.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A method for researching the carbon reserve of forest soil is characterized by comprising the following steps:
s1. surveying the coastal terraces of multiple regions by route survey and field sample survey, selecting different forest types of representative regions to establish sample plots for the survey objects;
s2, collecting a soil sample from the soil profile excavated in the sample plot or in the extension, analyzing and determining the physical property, the chemical property and the biological property of the forest soil, and obtaining the current soil fertility and the current soil fertility trend of different forest types of the coastal terrace;
s3., existing carbon characteristics, root biomass storage carbon characteristics and microorganism form carbon of litter at each level of soil are researched, and the current situation and the pattern of the carbon density of soil of various forest types of the coastal plateau are further obtained;
s4. obtaining variation range of soil carbon of each forest type by researching distribution state and stock characteristics of soil carbon of main forest types of the coastal plateau; through the fixed-point and fixed-time observation of the years, the annual conversion characteristics of the carbon with various components are obtained, and the accumulation characteristics of the forest carbon are obtained;
s5. an estimation study was conducted on the carbon reserves of the forest type soils that predominate in the area.
2. The forest soil carbon reserve research method of claim 1, wherein: in step s1, 5 forest types including coco forest, casuarina, thinking forest, eucalyptus forest and rural secondary forest are used as survey objects and sample plots are established, cement boundary piles or PVC pipes are used for marking each sample plot, coordinate information of the sample plot is recorded through handheld GPS positioning equipment, and then plants in the sample plot are surveyed.
3. The forest soil carbon reserve research method of claim 1, wherein: step s2 specifically includes:
s21, measuring and analyzing the volume weight of the soil of different soil layer depths of various forest types;
s22, sampling and analyzing various types of forest soil, and determining the content of organic carbon in the soil profile;
s23, analyzing the soil fertility of various types of forests;
and S24, analyzing the relation between the forest soil organic carbon and the soil factor of the coastal plateau.
4. The forest soil carbon reserve research method of claim 1, wherein: step s3 specifically includes:
s31, comparing and analyzing the carbon content of the root system, the carbon density of the root system and the carbon reserve of the root system of 0-40cm in the forest;
and S32, carrying out comparative analysis on the carbon content of the forest litter, the carbon density of the forest litter and the carbon reserve of the forest litter.
5. A method as claimed in claim 3, wherein the method comprises the steps of: in step s21, when the profile soil volume weight analysis is performed, the soil volume weight of each soil layer depth of each forest type is measured and analyzed, and the variation trend of the soil volume weight along with the soil depth is obtained.
6. A method as claimed in claim 3, wherein the method comprises the steps of: in step s22, when the organic carbon distribution of the profile soil is analyzed, statistical analysis is performed on the organic carbon content of each soil layer depth of each forest type, so as to obtain the significance of the statistical difference of the organic carbon content of the soil in each forest type and each soil layer depth.
7. A method as claimed in claim 3, wherein the method comprises the steps of: and step s23, performing correlation analysis on the organic carbon content of different types of forest soil and the corresponding soil total nitrogen, soil total phosphorus, soil quick-acting potassium and soil ammonium nitrogen content.
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