CN109105091B - Rapid determination method for drought resistance of tree species based on stomatal safety margin index - Google Patents
Rapid determination method for drought resistance of tree species based on stomatal safety margin index Download PDFInfo
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- CN109105091B CN109105091B CN201811061623.4A CN201811061623A CN109105091B CN 109105091 B CN109105091 B CN 109105091B CN 201811061623 A CN201811061623 A CN 201811061623A CN 109105091 B CN109105091 B CN 109105091B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G17/00—Cultivation of hops, vines, fruit trees, or like trees
- A01G17/005—Cultivation methods
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
Abstract
The invention discloses a rapid determination method for drought resistance of tree species based on stomatal safety margin index. The rapid determination method comprises the following steps: measuring the water potential value of stomatal closure and the water potential value of xylem embolism threshold; and the difference value of the water potential value of the closed air hole and the water potential value of the embolism threshold value is the safety margin of the air hole, and the corresponding drought resistance is strong if the safety margin value of the air hole of the tree species is large. The invention adopts the stomata safety margin as an index for measuring the drought resistance of the tree species, the stomata safety margin is a character reflecting the inherent attribute of the plant and can not change greatly along with the change of the environment, the measurement result of the drought resistance of the tree species can be more accurate, the comprehensive characteristics of closing, water retention and xylem embolism resistance of the stomata of the tree species can be more comprehensively reflected, and the relativity of the stomata safety margin and the survival rate of the tree species is higher compared with the relativity of the anti-embolism capacity of the xylem and the relativity of the hydraulic safety margin and the survival rate of the tree species under the drought condition.
Description
Technical Field
The invention relates to the technical field of tree drought resistance determination, in particular to a rapid tree drought resistance determination method based on stomatal safety margin indexes.
Background
Drought is a main environmental factor limiting the survival and growth of trees, and the response and adaptation mechanism of plants to drought stress is always the key research content of plant physiology. Along with frequent drought events caused by climate change, forest decay and death in various regions around the world are increased remarkably. And the well-conditioned land is greened, and the rest is difficult land which is drought and barren. The afforestation is carried out on a drought-barren difficult place, firstly, a suitable drought-resistant afforestation tree species is selected, but various problems still exist on how to accurately and scientifically select and match the suitable tree species for the difficult place with great difficulty in afforestation in the future. Therefore, it is very important to master the method for judging the drought resistance between the tree species and select the appropriate tree species for different difficult places.
At present, the method for really proving the drought resistance among tree species is to select a typical difficult place, plant the tree species to be compared on the place, investigate the survival rate of the tree species after a plurality of years and judge the drought resistance among the tree species according to the survival rate. However, this method requires a very long time, at least 5 years or more. Therefore, it is necessary to find a more convenient and reliable index for characterizing drought resistance among tree species.
The anti-embolism capability of the xylem is considered as an important drought resistance index of the tree, and the stronger the anti-embolism capability is, the more the tree can maintain water conductance in the tree body under the drought condition. However, this is only one aspect of the drought of trees, so the drought resistance of tree species cannot be judged comprehensively and accurately.
In previous studies, hydraulic safety margin was considered to be a very good indicator for predicting drought resistance of tree species. The hydraulic safety margin is the difference between the lowest water potential of the tree species and the xylem embolism threshold water potential value. However, the water potential of the tree species varies with the environment, and if the minimum water potential of the tree species is required to be accurately obtained, the monitoring needs a long time, generally from one growing season to several years, so that the hydraulic safety margin index of the tree species is not a very determined value or needs a long time to be accurately measured, that is, the hydraulic safety margin has uncertainty and the measuring time period is long.
In the prior art, biochemical indexes such as superoxide dismutase, malondialdehyde and the like are often used for representing the drought resistance of tree species. The biochemical indexes respond to the change of drought conditions, but the single biochemical index is difficult to directly represent the drought resistance among tree species, and the biochemical indexes change along with the change of the environment and cannot quantify the drought resistance of the normally growing trees. In addition, if stress treatment is adopted to determine the biochemical indexes, a long time is needed, the workload is high and the accuracy is low when the number of trees is large, and the drought resistance of seedlings is difficult to represent adult tree species.
In summary, there is a need for a method for rapidly and accurately determining drought resistance between tree species.
Disclosure of Invention
The invention aims to provide a rapid determination method for drought resistance of tree species based on stomatal safety margin index, which can solve the problems of long determination time, large environmental influence on determination data and inaccurate determination result in the prior art of drought resistance determination of tree species.
In order to achieve the purpose, the invention provides a rapid determination method of drought resistance of tree species based on stomata safety margin index, which comprises the following steps: measuring the water potential value of stomatal closure and the water potential value of xylem embolism threshold; the difference value of the water potential value of the closed air hole and the water potential value of the embolism threshold value is the safety margin of the air hole, and if the safety margin value of the air hole of the tree species is large, the corresponding drought resistance is strong;
wherein, the step of measuring the closed water potential value of the air vent comprises the following steps:
step A: collecting branches of the tree species to be measured in the morning on a sunny day after rain or water irrigation;
and B: in the sun, measuring the stomatal conductance of the leaves by adopting a portable photosynthetic apparatus;
and C: after the conductivity of the air hole is measured, cutting off the leaves of the branches immediately, and measuring the water potential of the leaves by adopting a pressure chamber water potential instrument; measuring the air hole conductivity and the water potential value of another blade immediately after one blade is measured to obtain the air hole conductivity under different water potential gradients until the air hole conductivity is close to zero;
step D: drawing by taking the water potential of the blade as an abscissa and the gas hole conductivity of the blade as an ordinate to obtain a gas hole conductivity-water potential relation curve of the blade, wherein a point on the gas hole conductivity-water potential relation curve when the maximum gas hole conductivity is closed by 88% is taken as a gas hole closed water potential value;
the method for measuring the xylem embolism threshold water potential value comprises the following steps:
step E: collecting branches of tree species to be measured in the morning after rain, bringing the branches back to the room immediately after collection to enable the branches to be naturally dehydrated, and wrapping leaves or small branches on large branches at the upper parts and the lower parts of the branches by using tin foils;
step F: when the water is lost to a certain degree, the branches are protected from light, and the water of the whole branches is balanced for 2 hours; then measuring the water potential of the leaves or the twigs by using a pressure chamber water potential meter; then, immediately immersing long branches into water, cutting off stem sections for measuring xylem embolism, trimming the cuts of the stem sections by using a sharp blade, measuring the xylem embolism by using a low-pressure liquid flow system, and measuring a plurality of branches; and (3) constructing a xylem embolism vulnerability curve by taking the water potential as an abscissa and the embolism value as an ordinate, wherein the water potential (P88) when the broad-leaved trees are embolized for 88% is lethal water potential, and the water potential value is taken as an embolization threshold water potential value.
In a preferred embodiment, in step a, the timing of the collection of shoots is selected after 9:00 am on a sunny day after rain.
In a preferred embodiment, in step B, the portable photosynthetic apparatus is an L i-6400XT photosynthetic apparatus.
In a preferred embodiment, in step B, the light source of the leaf chamber in the portable photosynthetic apparatus is set to 1500 μmol/m2·s。
Wherein the light source of the leaf chamber in the portable photosynthetic apparatus is 1500 μmol/m2S to ensure comparability between tree species.
In a preferred embodiment, in step C, the pressure cell water potential meter is a PMS pressure cell water potential meter.
In a preferred embodiment, in step E, shoots are harvested using a shoot length selected to be greater than 1.5 times the maximum vessel length of the species.
Wherein, the length of the selected branch is 1.5 times of the maximum conduit length of the tree species, so that the artificial embolism generated during the shearing can be avoided.
In a preferred embodiment, in step F, at least 15 shoots are measured per species.
In a preferred embodiment, in step F, the branches are completely wrapped with black plastic bags and protected from light.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the safety margin of the air holes as an index for measuring the drought resistance of the tree species, the tree species with large safety margin of the air holes has stronger drought resistance, the safety margin of the air holes is a character reflecting the inherent attribute of the plant, can be quantified and cannot be greatly changed along with the change of the environment, therefore, the drought resistance measuring result of the tree species can be more accurate by adopting the safety margin of the air holes as the index for measuring the drought resistance of the tree species.
(2) Under drought conditions, trees have two main drought-adaptive strategies, one is to close air holes to reduce water loss, and the other is to resist the plugging of xylem ducts for transporting and guiding water; the stomata safety margin index unifies a plant stomata regulation strategy and a xylem embolism resistance strategy, represents the synergistic capability of tree stomata behaviors and xylem embolism resistance, and can more comprehensively reflect the comprehensive characteristics of closing, water retention and xylem embolism resistance of tree stomata compared with the conventional method for judging the drought resistance of trees only from the aspect of xylem embolism resistance.
(3) The woody part anti-embolism capability and the hydraulic safety margin are indeed related to the survival rate of the tree species, but the correlation between the air hole safety margin and the survival rate of the tree species is higher than that of the woody part anti-embolism capability and the hydraulic safety margin, so that the correlation between the air hole safety margin and the survival rate is strong and weak through the air hole closed water potential value, the anti-embolism capability index, the hydraulic safety margin index and the air hole safety margin, and the air hole safety margin is the best index for judging the drought resistance of the tree species.
(4) The method for measuring the drought resistance of the tree species by adopting the stomata safety margin index has short time, the stomata safety margin of one tree species can be measured within a few days, the existing hydraulic safety margin index needs to measure the time from one growing season to several years, and the measuring period of the measuring method is shorter.
Drawings
FIG. 1 is a graph of the safety margin indicator-survival rate relationship for different tree species stomata according to an embodiment of the present invention.
FIG. 2 is a graph of closed water potential point-survival rate for leaf stomata of different species according to comparative examples of the present invention.
FIG. 3 is a graph showing the relationship between the anti-embolism capability and the survival rate of xylem of different tree species according to the comparative example of the present invention.
FIG. 4 is a graph of hydraulic safety margin-survival rate for xylem of different species of trees according to comparative examples of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The portable photosynthetic apparatus is available from Beijing Gaotai technologies, Inc. under model number L i-6400 XT.
The pressure cell water potential meter was purchased from PMS instruments ltd, oregon, usa under model number PMS 1000.
Example (b): rapid determination method for drought resistance of tree species based on stomatal safety margin index
(1) The experimental summary:
a field afforestation test is carried out on a representative limestone mountain land in North China, the site is located in Taian city, Shandong province, the proportion of bare rocks in the limestone mountain land is more than 40%, the thickness of a soil layer is 5-15cm, and the limestone mountain land has the characteristics of drought and barren mountains in North China.
(2) And (3) experimental tree species:
selecting 15 tree species which are planted in the test place in 2011, wherein the 15 tree species are fraxinus chinensis, ailanthus altissima swingle, robinia pseudoacacia, walnuts, pepper, pistacia chinensis bunge, cotinus coggygria, torch trees, monarch drug substances, chinaberry, goldenrain tree, mulberry, wild apricot, persimmon tree and wild peach. The tree species cover most of drought-resistant local tree species commonly used for afforestation in northern China, and are strong in drought resistance, but after the tree species survive in the limestone habitat with severe drought for 7 years, the survival rates of different tree species still show a remarkable difference gradient.
The survival rate of the tree species represents the true drought resistance of the tree species, so that the survival rate of the tree species represents the drought resistance of the tree species.
(3) The experimental steps are as follows:
collecting branches of the above 15 tree species at 10:00 am on sunny days after rain, measuring stomatal conductance of leaves with L i-6400XT photosynthetic apparatus under sunlight, wherein light source of leaf chamber in the photosynthetic apparatus is 1500 μmol/m2S; after the conductivity of the air hole is measured, cutting off the blades of the branches immediately, and measuring the water potential of the blades by adopting a PMS pressure chamber water potential instrument; measuring the gas hole conductivity and the water potential value of another blade immediately after one blade is measured to obtain the gas hole conductivity under different water potential gradients until the gas hole conductivity is close to zero; drawing by taking the water potential of the blade as an abscissa and the gas hole conductivity of the blade as an ordinate to obtain a gas hole conductivity-water potential relation curve of the blade, wherein on the gas hole conductivity-water potential relation curve, a point at which the maximum gas hole conductivity is closed by 88% is taken as a gas hole closing water potential value;
collecting branches of tree species in the morning after rain, wherein the length of the collected branches is 1.5 times larger than the maximum conduit length of the tree species so as to avoid artificial embolism when the tree species is cut off; the branches are taken back to the room immediately after being collected so that the branches are naturally dehydrated, and when the water is dehydrated to a certain degree, black plastic bags are adopted to completely wrap the branches for light-shielding treatment, so that the water content of the whole branches is balanced for 2 hours; measuring the water potential of the wrapped blades or twigs by adopting a PMS pressure chamber water potential meter; then, immediately immersing long branches into water, cutting off stem sections needing to be measured for xylem embolism, trimming cut of the stem sections by using a sharp blade, measuring the xylem embolism by using a low-pressure liquid flow system, measuring 15 branches, constructing a xylem embolism vulnerability curve by using water potential as abscissa and embolism value as ordinate, and using the water potential (P88) when the broad-leaved tree is embolized for 88% as lethal water potential and using the water potential value as an embolization threshold water potential value;
the difference value of the water potential value of the air hole closing and the water potential value of the embolism threshold value is the air hole safety margin; the stomata safety margin index is used as an abscissa, and the survival rate of the corresponding tree species is used as an ordinate, so as to obtain a stomata safety margin index-survival rate relation graph of different tree species shown in fig. 1, wherein different points in the graph represent different tree species.
In arid mountains, the drought resistance of the tree species with high survival rate is high, and therefore, the height of the survival rate represents the drought resistance of the tree species. As can be seen from FIG. 1, the survival rate between tree species and the safety margin of air holes are obviously related, the correlation coefficient (R) reaches 0.782 and is higher than that of other indexes in the comparative example, which shows that the drought resistance between tree species represented by the safety margin index of air holes can reflect the real drought resistance of tree species better, and the drought resistance between tree species detected by the safety margin index of air holes is less interfered by the environment and has short determination time.
Comparative example: the drought resistance is respectively measured by adopting the pore closing water potential value, the anti-embolism capability index and the hydraulic safety margin index of the tree species
(1) Measuring drought resistance of the 15 tree species based on stomata closing water potential points
Collecting branches of the above 15 tree species at 10:00 am on sunny days after rain, measuring stomatal conductance of leaves with L i-6400XT photosynthetic apparatus under sunlight, wherein light source of leaf chamber in the photosynthetic apparatus is 1500 μmol/m2S; after the conductivity of the air hole is measured, cutting off the blades of the branches immediately, and measuring the water potential of the blades by adopting a PMS pressure chamber water potential instrument; measuring the air hole conductivity and water potential value of another blade immediately after one blade is measured to obtain the air hole conductivity under different water potential gradients until the air hole conductivity approaches toZero; plotting by taking the water potential of the blade as an abscissa and the gas hole conductivity of the blade as an ordinate to obtain a gas hole conductivity-water potential relation curve (see fig. 2) of the blade, and taking a point at which the maximum gas hole conductivity is closed by 88% as a gas hole closed water potential value on the gas hole conductivity-water potential relation curve; and (3) obtaining a relationship graph of the closed water potential points of the air holes of different tree species and the survival rate shown in the graph 2 by taking the index of the closed water potential of the air holes as an abscissa and the survival rate of the corresponding tree species as an ordinate, wherein different points in the graph represent different tree species.
As can be seen from FIG. 2, there is no correlation between the closed water potential point of the stomata and the survival rate, i.e., whether the stomata of the tree species are easy to close or not does not represent the drought resistance of the tree species.
(2) Drought resistance of the 15 tree species is determined based on xylem anti-embolism capacity index
Collecting branches of the 15 tree species in the morning after rain, wherein the length of the collected branches is 1.5 times larger than the maximum conduit length of the tree species; the branches are taken back to the room to be naturally dehydrated, and when the water is dehydrated to a certain degree, black plastic bags are adopted to completely wrap the branches for light-shielding treatment, so that the water content of the whole branches is balanced for 2 hours; measuring the water potential of the wrapped blades or twigs by adopting a PMS pressure chamber water potential meter; then, immediately immersing long branches into water, cutting off stem sections needing to be measured for xylem embolism, trimming the cuts of the stem sections by using a sharp blade, measuring the xylem embolism of 15 branches by using a low-pressure liquid flow system, constructing a xylem embolism vulnerability curve by using the water potential as a horizontal coordinate and the embolism value as a vertical coordinate, and using the water potential (P88) when the broad-leaved tree is embolized for 88% as a lethal water potential value as an embolization threshold water potential value; the anti-embolism capability index is used as the abscissa and the survival rate of the corresponding tree species is used as the ordinate, so as to obtain a relationship graph of the anti-embolism capability and survival rate of xylem of different tree species shown in fig. 3, wherein different points in the graph represent different tree species.
As can be seen from fig. 3, the anti-embolism capability of xylem significantly correlates with survival rate, but the correlation coefficient R is 0.673, which is smaller than that in the example (R ═ 0.782).
(3) Measuring the drought resistance of the 15 tree species based on the hydraulic safety margin index
The hydraulic safety margin is the difference between the seasonal minimum water potential of the tree species and the xylem embolism threshold water potential value. The xylem embolism threshold water potential value is measured as described above. The method for quickly measuring the lowest seasonal water potential comprises the following steps: during the long-term non-raining period of a year, the water potential of the tree species is measured by a pressure chamber water potential meter for many times, and the lowest value of the water potential values is taken as the seasonal lowest water potential of the tree species. The difference is made between the measured seasonal minimum water potential of the 15 kinds of tree species and the xylem embolism threshold value water potential value to obtain a hydraulic safety margin value; and (3) obtaining a relationship graph of the hydraulic safety margin-survival rate of xylem of different tree species shown in the graph 4 by taking the hydraulic safety margin index as an abscissa and the survival rate of the corresponding tree species as an ordinate, wherein different points in the graph represent different tree species.
As can be seen from fig. 4, the hydraulic safety margin and the survival rate are also significantly related, but the correlation coefficient R is 0.73, which is smaller than that in the example (R ═ 0.782).
In conclusion, the woody part anti-embolism capability and the hydraulic safety margin are indeed related to the survival rate of the tree species, but the correlation between the air hole safety margin and the survival rate of the tree species is higher than that between the woody part anti-embolism capability and the hydraulic safety margin, so that the correlation between the air hole safety margin and the survival rate is strong and weak through the air hole closed water potential value, the anti-embolism capability index, the hydraulic safety margin index and the air hole safety margin, and the air hole safety margin is the best index for judging the drought resistance of the tree species.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. A rapid determination method for drought resistance of tree species based on stomatal safety margin index is characterized in that: the assay method comprises: measuring the water potential value of stomatal closure and the water potential value of xylem embolism threshold; the difference value of the water potential value of the closed air hole and the water potential value of the embolism threshold value is the safety margin of the air hole, and if the safety margin value of the air hole of the tree species is large, the corresponding drought resistance is strong;
wherein, the step of measuring the closed water potential value of the air vent comprises the following steps:
step A: collecting branches of the tree species to be measured in the morning on a sunny day after rain or water irrigation;
and B: in the sun, measuring the stomatal conductance of the leaves by adopting a portable photosynthetic apparatus;
and C: after the conductivity of the air hole is measured, cutting off the leaves of the branches immediately, and measuring the water potential of the leaves by adopting a pressure chamber water potential instrument; measuring the air hole conductivity and the water potential value of another blade immediately after one blade is measured to obtain the air hole conductivity under different water potential gradients until the air hole conductivity is close to zero;
step D: drawing by taking the water potential of the blade as an abscissa and the gas hole conductivity of the blade as an ordinate to obtain a gas hole conductivity-water potential relation curve of the blade, wherein a point on the gas hole conductivity-water potential relation curve when the maximum gas hole conductivity is closed by 88% is taken as a gas hole closed water potential value;
the method for measuring the xylem embolism threshold water potential value comprises the following steps:
step E: collecting branches of tree species to be measured in the morning after rain, bringing the branches back to the room immediately after collection to enable the branches to be naturally dehydrated, and wrapping leaves or small branches on large branches at the upper parts and the lower parts of the branches by using tin foils;
step F: when the branches lose water to different water potentials which can completely construct a embolism vulnerability curve, shading treatment is carried out, and the water content of the whole branches is balanced for 2 hours; then measuring the water potential of the leaves or the twigs by using a pressure chamber water potential meter; then, immediately immersing long branches into water, cutting off stem sections for measuring xylem embolism, trimming the cuts of the stem sections by using a sharp blade, measuring the xylem embolism by using a low-pressure liquid flow system, and measuring a plurality of branches; and (3) constructing a xylem embolism vulnerability curve by taking the water potential as an abscissa and the embolism value as an ordinate, wherein the water potential (P88) when the broad-leaved trees are embolized for 88% is lethal water potential, and the water potential value is taken as an embolization threshold water potential value.
2. The rapid assay method according to claim 1, wherein in step a, the time for collecting shoots is selected after 9:00 am on a sunny day after rain.
3. The rapid assay method of claim 1, wherein in step B, the portable photosynthetic apparatus is an L i-6400XT photosynthetic apparatus.
4. The rapid measurement method according to claim 1 or 3, wherein in step B, the light source of the leaf chamber in the portable photosynthetic apparatus is set to 1500 μmol/m2·s。
5. The rapid assay method of claim 1, wherein in step C, the pressure cell water potential meter is a PMS pressure cell water potential meter.
6. The rapid assay method according to claim 1, wherein in step E, shoots are harvested at a length selected to be greater than 1.5 times the maximum vessel length of the species.
7. The rapid assay method according to claim 1, wherein in step F, at least 15 shoots are assayed per species.
8. The rapid assay method according to claim 1, wherein in step F, the shoots are completely wrapped with black plastic bag and protected from light.
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| CN113203655A (en) * | 2021-05-24 | 2021-08-03 | 昆明理工大学 | Measuring equipment for measuring anti-embolism degree of plant xylem by using pneumatic method |
| CN113466289B (en) * | 2021-06-28 | 2022-07-12 | 中国农业大学 | System and method for measuring vulnerability of crop leaf embolism |
| CN114383666B (en) * | 2022-01-20 | 2023-11-28 | 信阳师范学院 | Leaf hydraulic vulnerability curve measuring equipment and method |
| CN114441712B (en) * | 2022-01-21 | 2023-04-28 | 中国农业大学 | Irrigation curve determination method and device based on fragile characteristic of air hole |
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| 木本植物木质部栓塞测定技术的争议与进展;陈志成 等;《林业学报》;20180531;第54卷(第5期);第144-151页 * |
| 树木抗旱机理研究进展;李燕 等;《生态学杂志》;20071130;第26卷(第11期);第1587-1866页 * |
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