A method for screening and preparing soil carbon and nitrogen mineralization components

Abstract

The invention relates to a method for screening and preparing soil carbon and nitrogen mineralization components, which is characterized in that the soil aggregates are screened step by step according to their particle sizes in combination with the washing power of water and the power of mechanical vibration, so as to obtain different The water-stable aggregates with large particle size are then subjected to closed culture, oscillating extraction and filtration, and the ammonium nitrogen and nitrate nitrogen are measured with a continuous flow analyzer to measure the difference between ammonium nitrogen and nitrate nitrogen before and after 12 days of cultivation Indicate the net nitrogen mineralization potential of each component soil, measure the inorganic carbon content of the lye displaced by TOC instrument, and use the change of inorganic carbon before and after 12 days of cultivation to represent the net carbon mineralization potential of each component soil, and then obtain the sieve According to the mineralization ability of the easy-to-decompose and decomposition-resistant components obtained, the present invention obtains the mineralization ability of each component by testing the mineralization potential of each component of the soil, and provides new indicators for the soil's ability to supply carbon and nitrogen. Optimizing soil fertilization measures provides a better basis.

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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