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Method for measuring nutrient concentration of leaves

A nutrient and concentration technology, applied in the direction of measuring devices, analysis materials, instruments, etc., can solve problems such as inaccurate calculation results, reduced weight of a single leaf, inappropriateness, etc., and achieve simple and accurate calculation methods. Effect

Inactive Publication Date: 2010-06-09
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Therefore, when calculating leaf nutrient concentration, the algorithm based on leaf weight is not appropriate, because nutrients migrate and redistribute in the poplar before and after leaf litter, resulting in the recovery of litter leaf nutrients and the decrease of single leaf weight , the calculation result is not accurate

Method used

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  • Method for measuring nutrient concentration of leaves

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Embodiment

[0016] Take poplar as an example:

[0017] 1) A. Collect mature leaves and fallen leaves from a tree to be tested as leaf samples, randomly select 100 mature leaves as the group before falling leaves, and 100 leaves as the group after falling leaves; Make 400 holes respectively on the blade of group after falling leaves (on each blade, the leaf disc area=63-70% leaf area that gets off), obtain 800 leaf discs, the area of ​​puncher is 2.77cm 2 , the two parts of leaves were dried at 80°C to constant weight and then weighed, and the calculated specific leaf weight LMA of leaves and fallen leaves were 93.1 and 70.2g / m 2 , LMA = total dry weight of all leaf discs / total area of ​​all leaf discs.

[0018] B. Dry the leaf samples of the pre-defoliation group and the post-defoliation group of the trees to be tested at 80°C to constant weight, grind them, pass through a 2mm sieve, and take 0.5-5g of the leaves after grinding to measure the nutrient concentration. Determination, repea...

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Abstract

The invention relates to measurement for nutrient concentration in leaves, in particular to the method for measuring the nutrient concentration of leaves, which comprises the following steps: firstly, calculating a specific leaf weight of the leaves; secondly, measuring the nutrient concentration of a unit mass; and finally, converting the nutrient concentration of the unit mass to the nutrient concentration of a unit leaf area. The nutrient concentration calculated by the method is truer and more reliable.

Description

technical field [0001] The invention relates to the determination of nutrient concentration in leaves, in particular to a method for measuring the nutrient concentration of leaves. Background technique [0002] The function of trees to recycle many nutrient elements is one of the most important mechanisms for forest ecosystems to keep nutrients from being lost in the system. The leaves are the photosynthetic organs of trees, with strong physiological activities and high nutrient content, which can reflect the nutrient status of forest stands and soil, and are an important basis for nutrient management of plantation forests. [0003] Xue Li et al. reported that the leaf thickness of broad-leaved tree species varies with different tree species, and the cellulose and lignin in the leaves increase with the thickening of the leaves, resulting in an increase in the dry weight of the leaves. Therefore, the nutrient concentration based on the dry weight cannot represent the nutrient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 周桦宇万太张璐马强
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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