长期定位监测黑土结构质量指标的分异研究

Index variations of structure and quality of black soil with a long-term located monitoring

长期定位监测研究不同施肥处理黑土结构指标的分异结果表明 ,长期施用有机肥有利于 0 .0 5～ 0 .0 2mm和 0 .0 2～ 0 .0 0 2mm土壤粒级微团聚体形成及 >0 .2 5mm团聚体水稳性 ,并一定程度促进小粒级微团聚体的团聚 ;单施N肥处理土壤容重最大 ,对照处理土壤结构已明显退化且团聚体水稳性较低 ,而休闲地团聚体水稳性明显较高 。

The index variations of structure and quality of black soil with a long-term located monitoring are analyzed.The results show that a long-term utilization of organic manure increases the microaggregate of the fraction,i.e.0.05～0 02mm,0.02～0.002mm and the waterstable capability of soil aggregate (>0.25mm),and may facilitate the microaggregate to form lots of stable clay-particles.The soil bulk density of single use of N disposal is the largest in all the fertilized treatments, the soil structure of CK is markedly degenerated and the soil aggregate waterstable is low ,while the soil aggregate waterstable capability of fallow is markedly higher compared with others,thus indicating that the organic materials play a determinative role in the shape and conservation process of soil structure.