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农田土壤的“抗逆性”是表征土壤肥力水平的一项综合指标.其重要内容之一,就是土壤对营养物质的保持和持续供应的能力.我国农民对肥沃土壤所谓“饱得饿得”的描述,就是指的这一点.考虑到土壤氮素在作物营养中的重要作用,和以不同粒径微团聚体构成的土壤有机无机复合体是土壤肥力的基础物质和土体结构的基本单元,并在保持和调节作物氮素营养方面具有重要作用,本文对不同肥力水平的棕壤及其各粒径微团聚体的氮素特征和供氮性能进行了比较研究,以期进一步了解土壤的肥力实质.
The “resistance” of farmland soil is a comprehensive indicator of soil fertility level, one of the important contents is the ability of soil to maintain and supply nutrients continuously.The so-called “hungry” Is to refer to this point.Considering the important role of soil nitrogen in crop nutrition, and soil organic-inorganic complex composed of micro-aggregates of different particle size is the basic unit of soil fertility and soil structure , And plays an important role in maintaining and regulating the nitrogen nutrition of crops. In this paper, the nitrogen characteristics and nitrogen-supplying performance of brown soil and its micro-aggregates with different fertility levels were compared in order to further understand the fertility of soil substance.