Method for measuring contribution rate of plant root system to nitrification and denitrification of soil

Abstract

The invention provides a method for measuring a contribution rate of a plant root system to nitrification and denitrification of soil. The method comprises the following steps: selecting a 20m*20m sample area in a forest or in a field, selecting five 2m*2m small units in the sample area according to an S-shaped point sampling method, digging ditches with widths of 0.3m and depths which exceed the root depth by 0.2m around the small units, inserting fiber glass into the ditches to stop roots from growing inwards, and filling back the dug soil into the ditches; then sampling by adopting a cutting ring, measuring nitrification and denitrification rates of the soil in the 2m*2m small units by utilizing a BaPS soil nitrogen cycle monitoring system, simultaneously measuring nitrification and denitrification rates in adjacent 2m*2m small units, and calculating the contribution rate of the plant root system to the nitrification and denitrification process of the soil according to a formula. The method is used for guiding to measure how the root system influences the forest soil ecological system and regulates carbon-nitrogen balance, and has an important effect of knowing about participation of a root system layer of the integral forest in geobiochemical nitrogen cycle.

Description

technical field [0001] The invention relates to the field of geochemistry, in particular to a method for measuring the contribution rate of plant roots to soil nitrification and denitrification. Background technique [0002] According to a study by the Intergovernmental Panel on Climate Change (IPCC), since the industrialization era, human activities have caused an increase in global greenhouse gas emissions, with emissions increasing by 70% from 1970 to 2004. Global atmospheric CO due to human activity since 1750 2 , N 2 O and CH 4 Concentrations have increased significantly and are now far beyond those measured in ice core records in the pre-industrial millennia. CO 2 is the most important anthropogenic greenhouse gas, and from 1970 to 2004, CO 2 The emission of N has increased by about 80%, and its concentration change has risen from 280ppm before the industrial revolution to 379ppm in 2005; while N 2 O is a relatively stable greenhouse gas, and its Global Warming P...

AI Technical Summary

Problems solved by technology

[0004] Soil nitrification and denitrification process is N 2 O The main process of greenhouse gas release. In the existing technology, only the release of N from forest soil is measured. 2 O greenhouse gas is used to study the adjustment of carbon and nitrogen balance in the soil ecosystem, and the determination of the contribution rate of forest plant roots to the soil nitrification and denitrification process is still not intuitive.

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