摘要
本文以不同肥力黑土和棕壤为试材,通过对各级微团聚体中胶结物质数量、分布及其特性的研究表明:各级微团聚体中胶结物质的分布是随着微团聚体粒径增大而减少,各级微团聚体对养分的供储功能在很大程度上取决于其中胶结物质的种类、数量和存在形态。小于10μm的微团聚体之所以对养分有较大的吸储功能,主要是由于含有大量有机和无机胶结物,大粒级微团聚体由于在其形成过程中既有松结态有机胶结物与矿质土粒的复合,又有由小粒级复合体的逐级团聚,因此表现出疏松多孔,对养分的释放能力较强。
In this experiment the distribution, contents and specificity of cementing substances in the microaggregates of Black soils and Brown forest soils of different fertility were studied. The results showed that the content of cementing substances in the microaggregates markedly decreased with the size increase of the microaggregates. The ability of microaggregates to supply and conserve plant nutrients is significantly related to the kind state and amount of cementing substances. The microaggregates of<10μm has the greater ablity than the microaggregater of>10μm in conserving plant nutrients. Therefore, increasing the content and improving the composition distribution and specificity of cementing material, espeeially the organic cementing substanles, should be noticed to promote soil fertility.
出处
《沈阳农业大学学报》
CAS
CSCD
1991年第1期55-60,共6页
Journal of Shenyang Agricultural University
关键词
黑土
棕壤
微团聚体
胶结物质
肥力
Black soil
Brown forest soil
microaggregates
cementing substances
fertility
