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Method of diagnosis for forest tree nutritional equilibrium

A diagnostic method and tree technology, applied in the field of afforestation, can solve problems such as inaccurate judgment of the nutritional balance of forest trees

Inactive Publication Date: 2008-08-20
INST OF FORESTRY CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0003] The shortcoming of above-mentioned prior art is: to the inaccurate state judgment of tree nutrient balance

Method used

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  • Method of diagnosis for forest tree nutritional equilibrium

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specific Embodiment

[0026] Through the influence of N, P, and NP nutrition on the growth of Chinese fir seedlings and the distribution of photosynthetic products, the relationship between the root-to-shoot ratio R / S and the nutritional balance of forest trees was analyzed:

[0027] Under different nutrient stress conditions, the pattern of accumulation and distribution of photosynthetic products in Chinese fir seedlings is different. In the state of N and P deficiency, increasing the supply of N causes the accumulation of photosynthetic products in 2-year-old seedlings to transfer from roots and stems to leaves; For 1-year-old seedlings, applying P could transfer photosynthetic products from roots to stems and leaves; different from applying phosphorus to 1-year-old seedlings, applying phosphorus to 2-year-old seedlings could transfer photosynthetic products from stems to roots.

[0028] In the state of sufficient N nutrition and P deficiency, the effect of NP fertilizer application on the dry mat...

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Abstract

The invention discloses a diagnosis method for forest nutrient balance, which is characterized in that, forest nutrient balance is determined by judging the root-shoot ratio R / S of the forest; when R / S is equal to a reference value, the forest has nutrient balance; when R / S is larger than the reference value, the forest has nutrition deficiency; when R / S is smaller than the reference value, the forest has nutrient excess; the root-shoot ratio R / S can also be described by an allometric model y=axk to be: lnS=a+klnR, when k<1, the forest has nutrition deficiency; when k>1, the forest has nutrient excess; when k=1, the forest has nutrient balance. The diagnosis method is formed from the relation angle of the adaptive mechanism of the forest to nutrition stress and the distribution pattern of Chinese fir seedling photosynthate. The diagnosis method has an advantage that the state of forest nutrient balance can be judged accurately.

Description

technical field [0001] The invention relates to an afforestation technique, in particular to a diagnosis method for tree nutrition balance. Background technique [0002] The nutrient deficiency of trees is caused by the lack of nutrient elements and the imbalance of nutrients in the soil. In the prior art, about the diagnosis of tree nutrition, the critical value method, the comprehensive diagnosis method (DRIS method) and the vector analysis method are mainly used. [0003] The shortcoming of above-mentioned prior art is: the state judgment to the tree nutrient balance is inaccurate. Contents of the invention [0004] The purpose of the present invention is to provide a diagnostic method for accurately judging the nutritional balance state of forest trees. [0005] The purpose of the present invention is achieved through the following technical solutions: [0006] The diagnosis method of tree nutritional balance of the present invention is characterized in that the nut...

Claims

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Application Information

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IPC IPC(8): A01G23/00
Inventor 张建国
Owner INST OF FORESTRY CHINESE ACAD OF FORESTRY
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