Method for screening and preparing soil carbon and nitrogen mineralized components

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 [0001] The invention relates to the field of soil chemistry, in particular to a method for screening and preparing soil carbon and nitrogen mineralization components, which can be applied to the fields of soil fertilization and improvement. Background technique [0002] The organic carbon and nitrogen components in the soil are an important indicator reflecting soil fertility and biological activity, which can be divided into easily decomposed parts and decomposed parts, while the easily decomposable and refractory parts of the soil are composed of aggregates of different particle sizes. Composition, easily decomposable carbon and nitrogen components refer to the active carbon and nitrogen components in the soil that are highly effective, easily decomposed and mineralized by soil microorganisms, and have a direct effect on plant nutrient supply. It can indicate changes in soil organic carbon and nitrogen, and is a reflection of soil Sensitivity indicators of ...

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Problems solved by technology

Domestic researchers Ju Xiaotang, Li Shengxiu, Zhu Zhaoliang, etc. have done a lot of work on the mineralization rate and mineralization parameters by using easily mineralized carbon and nitrogen to accurately predict the soil's carbon and nitrogen supply capacity. However, the soil carbon and nitrogen mineralization process is extremely complicated, and soil It is still difficult to accurately predict the soil nitrogen supply in the process of organic carbon and nitrogen mineralization

[0004] Through the previous research work, it is found that the sieving of soil aggregates with different particle sizes is mainly a small amount or a small amount of sieving (25-80g), only to achieve the basic carbon and nitrogen pool content required by simple determination. If a large number of components are required Repeated screening is required, the workload is heavy and cumbersome, and the carbon and nitrogen turnover characteristics of different components are generally predicted by models, and the mineralization capacity of each component is not unified with the mineralization capacity of the original soil. Compare

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