有机物料对白浆土微团聚体组成及其养分含量的影响

通过长期盆栽试验,研究了施用有机物料对白浆土各粒径微团聚体及其养分的影响。结果表明,施加有机物料能明显减少<1与1～2μm小粒径微团聚体和促进2～5μm与5～10μm粒径微团聚体的形成,提高各粒径微团体中有机碳和全N的含量,后二者主要分布于小粒径的微团聚体中。小粒径微团聚体中的全P含量较高,随着粒径增大,P含量呈下降趋势,在10～50μm粒径处最低,随后又呈上升趋势。其中<1、1～2和5～10μm各粒径中的P含量与土壤有效P呈显着正相关。牛粪对白浆土微团聚体组成及其养分含量的影响好于麦秸。

Effect of organic materials on the composition characteristics of micro-aggregates in albic soils and their nutrient contents

A long term pot experiment shows that the composition of various particle sizes of micro-aggregates in albic soils could be altered through adding organic materials. The content of＜1μm and 1～2μm micro-aggregates was decreased, while that of 2～5μm and 5～10μm micro-aggregates increased. The contents of organic C and total N were markedly increased in all sizes micro-aggregates after organic materials amendment, which mainly distributed in small sizes of micro-aggregates. The P content was higher in small sizes of micro-aggregates, while the 10～50μm micro-aggregates had the least P content. There was a significant positive relationship between total P and Olsen P in ＜1, 1～2 and 5～10μm micro-aggregates. The effect of cow manure was better than that of wheat straw.