CN105137036A - Method for screening and preparing soil carbon and nitrogen mineralized components - Google Patents
Method for screening and preparing soil carbon and nitrogen mineralized components Download PDFInfo
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Abstract
The invention relates to a method for screening and preparing soil carbon and nitrogen mineralized components, and is characterized in that with combination of water swashing power and mechanical shock power, soil aggregates are screened step by step according to the particle size, so that water-stability aggregates with different particle sizes are obtained and then are subjected to closed culture, oscillation extraction and filtration, ammonium nitrogen and nitric nitrogen are measured by a continuous flow analyzer, the difference value of ammonium nitrogen and nitric nitrogen measured after being cultured for 12 days is used for representing soil pure nitrogen mineralization potential of each component, the inorganic carbon content of a displaced alkali liquor is measured by a TOC analyzer, the variable quantity of inorganic carbon after being cultured for 12 days is used for representing the soil pure carbon mineralization potential of each component, and thus the mineralization ability of obtained easy-decomposition and anti-decomposition components is screened; through testing the mineralization potential of each soil component, the mineralization ability of each component is obtained, and a new index is provided for soil carbon and nitrogen supply ability and a better basis is provided for optimization of soil fertilization measures.
Description
Technical field
The present invention relates to soil chemistry field, be specially a kind of method of sieving and preparing SOIL CARBON AND NITROGEN mineralising component, improvement of soil fertility and improvement field can be applied to.
Background technology
Organic Carbon And Total Nitrogen component in soil is reflect soil fertility and a bioactive important indicator, it can be divided into easy decomposition part and resistance to decomposition part, easy, the difficult decomposition components of soil is then made up of the aggregate of different-grain diameter, easy decomposition carbon nitrogen component to refer in soil that validity is high, is easily decomposed mineralising by soil microorganism, be supplied with direct acting part acticarbon nitrogen to plant nutrient, it can indicate Soil Organic Carbon And Total Nitrogen to change, and is reflect soil carbon, the dynamic susceptibility index in nitrogen storehouse.The carbon of resistance to decomposition nitrogen component is comparatively stable, has larger effect for SOIL CARBON AND NITROGEN fixing and soil texture, but it decomposes slow, and the supply capacity impact in a short time for soil nutrient is less.As far back as 1978, Campbell just the soil organism is divided into relatively stable with enliven two parts, afterwards along with research is goed deep into, the concept (MonaghanandBarraclough1995) of lightweight organic matter and stable humus was proposed, i.e. the origin of easy decomposition components and resistance to decomposition components.
The turnover characteristic of soil easy decomposition components carbon nitrogen weighs the important indicator of soil supply carbon nitrogen ability and fertility level thereof, in soil Carbon and nitrogen cycles process, have important effect.Therefore, research is easily decomposed the turnover characteristics such as the mineralising of carbon nitrogen component and is fostered and apply fertilizer to agricultural land soil and all to have great importance with soil fertility management.Meijboom etc. sum up and filter out the grouping that silicasol can optimize easy, the resistance to decomposition components of soil, Huygens etc. improve the group technology of Meijboom, utilize aggregate-density associating method of grouping to be divided into by the soil organism and easily decompose carbon nitrogen component and the carbon of resistance to decomposition nitrogen component, the mineralising etc. simulating carbon base in soil and nitrogen storehouse transforms dynamically.Studies in China person Chinese bush cherry huge dawn, Li Shengxiu, Zhu Zhaoliang etc. utilize easy mineralising carbon nitrogen accurate forecast soil to do a lot of work to mineralization rate and mineralization parameter for carbon nitrogen ability, but SOIL CARBON AND NITROGEN mineralization process is extremely complicated, quantitative Soil Organic Carbon And Total Nitrogen mineralization process also to acquire a certain degree of difficulty with Accurate Prediction Nitrogen rate provided by soil.
Screening mainly trace or a small amount of screening (25-80g) to different-grain diameter soil agreegate is found by the research work of forefathers, only for reaching the basic carbon nitrogen storehouse content required by simple mensuration, if a large amount of component need be obtained, through repeatedly sieving, workload is large and loaded down with trivial details, and the carbon nitrogen of different component turnover characteristic is generally drawn by model prediction, and compares the mineralization ability of each component is carried out unitarity with the mineralization ability of original soil.Therefore need a kind of rapid, high volume to sieve soil thus obtain the method for the organic component of different-grain diameter aggregate, considering whether the mineralization ability semi-invariant of different component and total mineralization ability of original soil are unified by longitudinal culture experiment.
This also just means that a kind of means of needs or technology accurately can be prepared a large amount of soil and easily decompose with resistance to decomposition components with the requirement meeting follow-up cultivation and observe its component characteristic.Current acquisition soil easily decomposes with resistance to decomposition components namely a lot to the method for soil organism grouping, wherein the structural failure degree of physical method to the soil organism is minimum, the component be separated can the 26S Proteasome Structure and Function of reflect soil original state component, and therefore the method is subject to the employing of many researchers all the time and becomes the main flow of soil organism grouping.
Summary of the invention
The invention provides a kind of disposable a large amount of screening soil and obtain easily decomposition and the carbon of resistance to decomposition nitrogen component, and determine by cultivating the research method that each screening component carbon nitrogen mineralization is mutually unified with original soil.According to the requirement obtaining different-grain diameter aggregate, quantitative soil is carried out wet method to sieve, utilize the water stability of soil and compass screen surface to shake up and down and isolate the aggregate component of different-grain diameter thus obtain easily decomposition and resistance to decomposition components.The application of this aggregate sieving machine can meet the aggregate component preparing a large amount of different-grain diameter interval, the new method of the soil different carbon nitrogen mineralization component that contributes to follow-up cultivation and research component characteristics, can become a kind of a large amount of screening, prepares.
The present invention is such technical solution problem: comprise the following steps:
(1) drench with the compass screen surface of water by upper screen and lower screen, then dry ground is laid on the compass screen surface of upper screen, 250 microns, upper screen aperture, then add water to the dry ground part not having moisture absorption with dropper, until dry ground all soaks;
(2) soil adding water to upper screen is submerged, and water level reaches screen frame 1/3 eminence;
(3) pulp classifier lower screen sieve aperture is 150 microns, shakes sieve for 30 minutes with pulp classifier;
(4) clarify to effusion by component in washed with de-ionized water upper screen and lower screen after screening, then the remaining ingredient in upper screen and lower screen is all transferred to other containers;
(5) adopt decantation repeatedly to spend component in deionized water container, top dirty solution is separated and collects, and till wash solution clarification, the object of washing is like this that suspension is separated with mineral parts;
(6) adopting hydro-extractor, to arrange rotating speed be that 3000r/min rotates 5 minutes, the thick organic matter after washing and particle diameter is greater than the mineral parts of 150 μm _ MF and particle diameter and is less than 150 μm of components and collects respectively;
(7) sieve thick organic matter that gained is greater than 150 μm _ MOM dry after for easy decomposition components, screening gained be greater than 150 μm _ MF mineral parts and screening gained be less than 150 μm of components dry mixing after be resistance to decomposition components;
(8) dried 48 hours under 45 DEG C of conditions by the pedotheque of different component, crossing 60 object sieves, easily decomposing and resistance to decomposition C, N content for measuring soil, soil organic matter adopts potassium dichromate Outside Heating Method mensuration, full nitrogen semimicro Kelvin method to measure.
The present invention can also technical solution problem like this: comprise the following steps:
(1) drench with the compass screen surface of water by upper screen and lower screen, then dry ground is laid on the compass screen surface of upper screen, 250 microns, upper screen aperture, then add water to the dry ground part not having moisture absorption with dropper, until dry ground all soaks;
(2) soil adding water to upper screen is submerged, and water level reaches screen frame 1/3 eminence;
(3) pulp classifier lower screen sieve aperture is 150 microns, shakes sieve for 30 minutes with pulp classifier;
(4) clarify to effusion by component in washed with de-ionized water upper screen and lower screen after screening, then the remaining ingredient in upper screen and lower screen is all transferred to other containers;
(5) adopt decantation repeatedly to spend component in deionized water container, top dirty solution is separated and collects, and till wash solution clarification, the object of washing is like this that suspension is separated with mineral parts;
(6) adopting hydro-extractor, to arrange rotating speed be that 3000r/min rotates 5 minutes, the thick organic matter after washing and particle diameter is greater than the mineral parts of 150 μm _ MF and particle diameter and is less than 150 μm of components and collects respectively;
(7) sieve thick organic matter that gained is greater than 150 μm _ MOM dry after for easy decomposition components, screening gained be greater than 150 μm _ MF mineral parts and screening gained be less than 150 μm of components dry mixing after be resistance to decomposition components;
(8) dried 48 hours under 45 DEG C of conditions by the pedotheque of different component, milled 2mm sieve after weighing, for Mineralized Culture;
(9) by above-mentioned oven dry, grind after two components of the same process of pedotheque respectively take 40g and equivalent to be placed in volume with the moistening mineralization soil Homogeneous phase mixing processed be airtight cultivation at 25 DEG C, 250ml Mason bottle, the built-in cuvette of Mason's bottle, the solution that 10ml concentration is 0.1mol/lNaOH is filled in built-in cuvette, arrange three repetitions, similarity condition arranges original soil and cultivates;
(10) cultivate the 2nd day and the 13rd day time the every bottle of 10g 2mol/lKCl that fetches earth respectively shake lixiviate, its ammonium nitrogen and nitrate nitrogen is measured with Continuous Flow Analysis instrument after filtering, cultivating 12 days ammonium nitrogens, nitrate nitrogen differences is each component soil net nitrogen mineralization potentiality, and then show that screening gained easily decomposes the mineralization ability with resistance to decomposition components;
(11) in cup, NaOH alkali lye was changed every 48 hours, and the alkali lye TOC instrument that swaps out measures its CO in time
2uptake, cultivating inorganic carbon content difference before and after 12 days is each component soil clean carbon mineralising potentiality, and then show that screening gained easily decomposes the mineralization ability with resistance to decomposition components.
The all right technical solution problem like this of the present invention: engine is fixed on frame, engine power output connecting eccentric wheel, and eccentric wheel connects screen frame (unit) by expansion link, screen frame (unit) is fixed upper screen and lower screen.
The principle that the present invention sieves different-grain diameter aggregate is: the flush power of Bound moisture and mechanical shock power, soil agreegate is sieved step by step by its particle size, the aggregate that particle diameter is greater than screen mesh diameter is stayed on compass screen surface, particle diameter is less than the aggregate of screen mesh diameter then through compass screen surface, enter next compass screen surface and continue screening, until not by compass screen surface mesh, thus obtain the water-stable aggregate of different-grain diameter size.
The beneficial effect that invention can reach is: on existing basis, improve the efficiency obtaining different carbon nitrogen mineralization component, namely can easy, the carbon of the resistance to decomposition nitrogen component of the stable soil of disposable a large amount of acquisition, avoid the systematic error that current a small amount of screening causes, to carry out the further research of SOIL CARBON AND NITROGEN component characteristic; Obtain a kind of method that SOIL CARBON AND NITROGEN component Mineralized Culture is mutually unified with original soil mineralising, namely the mineralising amount sum of original soil screening gained two kinds of decomposition components accounts between the 92-105% of the total mineralising amount of original soil, and the mineralising recovery is within zone of reasonableness.After this method solving soil constitution screening there is a difficult problem for larger difference in Mineralized Culture and original soil, will promote the development of pedology and Plant Nutrition.
Accompanying drawing explanation
Fig. 1 is soil agreegate sieving machine structural representation of the present invention;
Fig. 2 is black earth different component of the present invention clean carbon mineralising potentiality figure;
Fig. 3 is moisture soil different component of the present invention clean carbon mineralising potentiality figure;
Fig. 4 is black earth different component net nitrogen mineralization potentiality figure of the present invention;
Fig. 5 is moisture soil different component net nitrogen mineralization potentiality figure of the present invention.
Embodiment
Parts title in accompanying drawing representated by each label is as follows:
Frame 1, engine 2, eccentric wheel 3, expansion link 4, screen frame (unit) 5, upper screen 6, lower screen 7.
A kind of method of sieving soil carbon/nitrogen mineralization component in the present invention, is characterized in that: comprise the following steps:
(1) drench with the compass screen surface of water by upper screen and lower screen, then dry ground is laid on the compass screen surface of upper screen, 250 microns, upper screen aperture, then add water to the dry ground part not having moisture absorption with dropper, until dry ground all soaks;
(2) soil adding water to upper screen is submerged, and water level reaches screen frame 1/3 eminence;
(3) pulp classifier lower screen sieve aperture is 150 microns, shakes sieve for 30 minutes with pulp classifier;
(4) clarify to effusion by component in washed with de-ionized water upper screen and lower screen after screening, then the remaining ingredient in upper screen and lower screen is all transferred to other containers;
(5) adopt decantation repeatedly to spend component in deionized water container, top dirty solution is separated and collects, and till wash solution clarification, the object of washing is like this that suspension is separated with mineral parts;
(6) adopting hydro-extractor, to arrange rotating speed be that 3000r/min rotates 5 minutes, the thick organic matter after washing and particle diameter is greater than the mineral parts of 150 μm _ MF and particle diameter and is less than 150 μm of components and collects respectively;
(7) sieve thick organic matter that gained is greater than 150 μm _ MOM dry after for easy decomposition components, screening gained be greater than 150 μm _ MF mineral parts and screening gained be less than 150 μm of components dry mixing after be resistance to decomposition components;
(8) pedotheque of different component is dried 48 hours under 45 DEG C of conditions, 60 object sieves are crossed after weighing, easily decompose and resistance to decomposition C, N content for measuring soil, soil organic matter adopts potassium dichromate Outside Heating Method mensuration, full nitrogen semimicro Kelvin method to measure.
A kind of method preparing SOIL CARBON AND NITROGEN mineralising component in the present invention, is characterized in that: comprise the following steps:
(1) drench with the compass screen surface of water by upper screen and lower screen, then dry ground is laid on the compass screen surface of upper screen, 250 microns, upper screen aperture, then add water to the dry ground part not having moisture absorption with dropper, until dry ground all soaks;
(2) soil adding water to upper screen is submerged, and water level reaches screen frame 1/3 eminence;
(3) pulp classifier lower screen sieve aperture is 150 microns, shakes sieve for 30 minutes with pulp classifier;
(4) clarify to effusion by component in washed with de-ionized water upper screen and lower screen after screening, then the remaining ingredient in upper screen and lower screen is all transferred to other containers;
(5) adopt decantation repeatedly to spend component in deionized water container, top dirty solution is separated and collects, and till wash solution clarification, the object of washing is like this that suspension is separated with mineral parts;
(6) adopting hydro-extractor, to arrange rotating speed be that 3000r/min rotates 5 minutes, the thick organic matter after washing and particle diameter is greater than the mineral parts of 150 μm _ MF and particle diameter and is less than 150 μm of components and collects respectively;
(7) sieve thick organic matter that gained is greater than 150 μm _ MOM dry after for easy decomposition components, screening gained be greater than 150 μm _ MF mineral parts and screening gained be less than 150 μm of components dry mixing after be resistance to decomposition components;
(8) dried 48 hours under 45 DEG C of conditions by the pedotheque of different component, milled 2mm sieve after weighing, for Mineralized Culture;
(9) by above-mentioned oven dry, grind after two components of the same process of pedotheque respectively take 40g and equivalent to be placed in volume with the moistening mineralization soil Homogeneous phase mixing processed be airtight cultivation at 25 DEG C, 250ml Mason bottle, the built-in cuvette of Mason's bottle fills that volume is 10ml, concentration is 0.1mol/lNaOH solution, arrange three repetitions, similarity condition arranges original soil and cultivates;
(10) cultivate the 2nd day and the 13rd day time the every bottle of 10g 2mol/lKCl that fetches earth respectively shake lixiviate, its ammonium nitrogen and nitrate nitrogen is measured with Continuous Flow Analysis instrument after filtering, cultivating 12 days ammonium nitrogens, nitrate nitrogen differences is each component soil net nitrogen mineralization potentiality, and then show that screening gained easily decomposes the mineralization ability with resistance to decomposition components;
(11) in cup, NaOH alkali lye was changed every 48 hours, and the alkali lye TOC instrument that swaps out measures its CO in time
2uptake, cultivating inorganic carbon content difference before and after 12 days is each component soil clean carbon mineralising potentiality, and then show that screening gained easily decomposes the mineralization ability with resistance to decomposition components.
As shown in Figure 1, employ a kind of soil agreegate sieving machine in method of the present invention, it is characterized in that: engine 2 is fixed on frame 1, engine 2 clutch end connecting eccentric wheel 3, eccentric wheel 3 connects screen frame (unit) 5 by expansion link 4, screen frame (unit) 5 is fixed upper screen 6 and lower screen 7.
A kind of soil agreegate sieving machine course of work of the present invention, engine provides machine power, band movable eccentric wheel rotates, and eccentric wheel drives connecting link to move up and down, and connecting link is that the connectionist of engine and sifter device drives again screen frame (unit) to shake up and down, and then drive sifter device to shake up and down and sieve soil sample, wherein upper screen is different with lower screen aperture, and upper screen aperture is comparatively large, and lower screen aperture is less, frame is used for fixing engine and eccentric wheel, and makes both smooth and easyly connect; Container has accommodation sifter device and also accepts the soil constitution of sifting out.
In addition, for carrying out better management and control operation to a kind of soil agreegate sieving machine of the present invention, be also provided with numerical control part, wherein digital display screen can be understood in time and regulate and control rotating speed.
In accompanying drawing 2 ~ 5, lowercase represents the variance conspicuousness between same place reason different component, and capitalization represents the variance conspicuousness (P<0.05) between different disposal.
Table 1 soil sieve divides component ratio and quality, and full carbon and full nitrogen reclaim yield
[note: in table, numeral lowercase below represents the variance conspicuousness (P<0.05) under the different screening quality gradient in same place .]
Table 2 screening amount is 300g and 50g soil quality, full carbon and the contrast of full nitrogen recovery
[note: in table, numeral lowercase below represents the variance conspicuousness (P<0.05) under the different screening quality gradient in same place .]
Table 3 screening amount be 300g and 50g soil easily/contrast of the carbon of resistance to decomposition nitrogen content
[note: in table, numeral lowercase below represents the variance conspicuousness (P<0.05) under the different screening quality gradient in same place .]
Table 4 easily/resistance to decomposition components mineralising accounts for the number percent of original soil mineralising
Fig. 2 ~ 5 are clean carbon/nitrogen mineralization potentiality figure under black earth and moisture soil different component, and A is CK, represents the soil of not fertilizing and planting crop; B is NPK, represents the soil of normal fertilising N P and K long-term cropping; C is NPKS, represents that normal fertilising N P and K adds the soil of stalk Planting Crops; D is NPKM, represents that normal fertilising N P and K adds the soil of fertilizer Planting Crops.
Fig. 2 ~ 5 show black earth and moisture soil screening gained easily decomposes carbon nitrogen mineralization potentiality with resistance to decomposition components and original soil, and the clean carbon of easy decomposition components under each fertilizer treatment, net nitrogen mineralization potentiality are 1-3 times of resistance to decomposition components, have significant difference.
Prove that the carbon nitrogen mineralization ability of easily decomposition and resistance to decomposition components and original soil keep unified by Mineralized Culture test.The soil dissimilar to two kinds, the north sieves the recovery result obtaining Zhengzhou moisture soil and Gongzhuling black earth, and mass recovery on average maintains Zhengzhou 98.65%, Gongzhuling 97.38%; The nutrient recovery: the organic carbon nutrient recovery is Zhengzhou 97.53%, Gongzhuling 97.57%, the nitrogen nutrient recovery is Zhengzhou 97.54%, Gongzhuling 97.36%, all maintains higher recovery level; A small amount of and a large amount of screening result of two kinds of Different Soil has done to contrast and has passed through the present invention simultaneously, the more micro-screening result of mass recovery of this screening result improves 1%-2% on the original basis, the nutrient recovery improves 1%-8%, and the quantum of output of unit interval can promote 5 times than before simultaneously; The clean carbon of easy decomposition components under each fertilizer treatment, net nitrogen mineralization potentiality be the 1-3 of resistance to decomposition components doubly, have significant difference; Each component carbon nitrogen mineralization ability sum and original soil unification mutually, namely the mineralising amount sum of original soil screening gained two kinds of decomposition components accounts between the 92-105% of the total mineralising amount of original soil, the mineralising recovery is within zone of reasonableness, the present invention provides reliable technical support for the relation between the nutritional labeling studying ASI systematic approach and plant growth and need later, and then realizes volume increase, the high yield of China's plant husbandry.
Claims (3)
1. sieve a method for soil carbon/nitrogen mineralization component, it is characterized in that: comprise the following steps:
(1) drench with the compass screen surface of water by upper screen and lower screen, then dry ground is laid on the compass screen surface of upper screen, 250 microns, upper screen aperture, then add water to the dry ground part not having moisture absorption with dropper, until dry ground all soaks;
(2) soil adding water to upper screen is submerged, and water level reaches screen frame 1/3 eminence;
(3) pulp classifier lower screen sieve aperture is 150 microns, shakes sieve for 30 minutes with pulp classifier;
(4) clarify to effusion by component in washed with de-ionized water upper screen and lower screen after screening, then the remaining ingredient in upper screen and lower screen is all transferred to other containers;
(5) adopt decantation repeatedly to spend component in deionized water container, top dirty solution is separated and collects, and till wash solution clarification, the object of washing is like this that suspension is separated with mineral parts;
(6) adopting hydro-extractor, to arrange rotating speed be that 3000r/min rotates 5 minutes, the thick organic matter after washing and particle diameter is greater than the mineral parts of 150 μm _ MF and particle diameter and is less than 150 μm of components and collects respectively;
(7) sieve thick organic matter that gained is greater than 150 μm _ MOM dry after for easy decomposition components, screening gained be greater than 150 μm _ MF mineral parts and screening gained be less than 150 μm of components dry mixing after be resistance to decomposition components;
(8) pedotheque of different component is dried 48 hours under 45 DEG C of conditions, 60 object sieves are crossed after weighing, easily decompose and resistance to decomposition C, N content for measuring soil, soil organic matter adopts potassium dichromate Outside Heating Method mensuration, full nitrogen semimicro Kelvin method to measure.
2. prepare a method for the Mineralized Culture component of earth carbon nitrogen mineralization potentiality, it is characterized in that: comprise the following steps:
(1) drench with the compass screen surface of water by upper screen and lower screen, then dry ground is laid on the compass screen surface of upper screen, 250 microns, upper screen aperture, then add water to the dry ground part not having moisture absorption with dropper, until dry ground all soaks;
(2) soil adding water to upper screen is submerged, and water level reaches screen frame 1/3 eminence;
(3) pulp classifier lower screen sieve aperture is 150 microns, shakes sieve for 30 minutes with pulp classifier;
(4) clarify to effusion by component in washed with de-ionized water upper screen and lower screen after screening, then the remaining ingredient in upper screen and lower screen is all transferred to other containers;
(5) adopt decantation repeatedly to spend component in deionized water container, top dirty solution is separated and collects, and till wash solution clarification, the object of washing is like this that suspension is separated with mineral parts;
(6) adopting hydro-extractor, to arrange rotating speed be that 3000r/min rotates 5 minutes, the thick organic matter after washing and particle diameter is greater than the mineral parts of 150 μm _ MF and particle diameter and is less than 150 μm of components and collects respectively;
(7) sieve thick organic matter that gained is greater than 150 μm _ MOM dry after for easy decomposition components, screening gained be greater than 150 μm _ MF mineral parts and screening gained be less than 150 μm of components dry mixing after be resistance to decomposition components;
(8) pedotheque of different component is dried 48 hours under 45 DEG C of conditions, milled 2mm sieve after weighing;
(9) by above-mentioned oven dry, grind after two components of the same process of pedotheque respectively take 40g and equivalent to be placed in volume with the moistening mineralization soil Homogeneous phase mixing processed be airtight cultivation at 25 DEG C, 250ml Mason bottle, the built-in cuvette of Mason's bottle, the solution that 10ml concentration is 0.1mol/lNaOH is filled in built-in cuvette, arrange three repetitions, similarity condition arranges original soil and cultivates;
(10) cultivate the 2nd day and the 13rd day time the every bottle of 10g 2mol/lKCl that fetches earth respectively shake lixiviate, its ammonium nitrogen and nitrate nitrogen is measured with Continuous Flow Analysis instrument after filtering, cultivating 12 days ammonium nitrogens, nitrate nitrogen differences is each component soil net nitrogen mineralization potentiality, and then show that screening gained easily decomposes the mineralization ability with resistance to decomposition components;
(11) in cup, NaOH alkali lye was changed every 48 hours, and the alkali lye TOC instrument that swaps out measures its CO in time
2uptake, cultivating inorganic carbon content difference before and after 12 days is each component soil clean carbon mineralising potentiality, and then show that screening gained easily decomposes the mineralization ability with resistance to decomposition components.
3. a kind of soil agreegate sieving machine according to claim 1, it is characterized in that: engine (2) is fixed on frame (1), engine (2) clutch end connecting eccentric wheel (3), eccentric wheel (3) connects screen frame (unit) (5) by expansion link (4), the upper fixing upper screen (6) of screen frame (unit) (5) and lower screen (7).
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| CN114097521A (en) * | 2021-12-27 | 2022-03-01 | 贵州大学 | In-situ culture method for content of ammonium nitrogen and nitrate nitrogen in soil under pinus massoniana forest |
| CN114097521B (en) * | 2021-12-27 | 2022-12-02 | 贵州大学 | In-situ culture method for content of ammonium nitrogen and nitrate nitrogen in soil under pinus massoniana forest |
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