摘要
通过多年定位试验,研究黄土高原丘陵沟壑区不同耕作制度和种植方式对坡耕地土壤团聚数量、分布和稳定性的影响。结果表明,不同耕作方式下,免耕覆盖处理和免耕处理可明显增加土壤中大团聚体的含量,免耕覆盖处理有着相对更高的团聚体稳定性,并且更易形成>5mm水稳性团聚体;不同种植方式下,处理对大团聚体含量影响差异不显著。在同一耕作方式下不同种植方式的土壤大团聚体含量变化趋势不同。相关分析表明,大团聚体含量为土壤团聚体平均重量直径(MWD)产生影响的主要因素,容重对土壤团聚体平均重量直径亦有影响,团聚体破坏率只对水稳团聚体平均重量直径有影响。
A study of different tillage and cropping patterns was conducted by years on Loess Plateau hilly,by which effects of tillage and cropping patterns on quantity,distribution and stability of soil aggregate. The result showed that,in different tillage patterns,no-tillage with straw cover（NTS） and no-tillage （NT） has a significant impact on increased macro-aggregate content,specially in NTS,which has higher stability of soil aggregates than other treaments,moreover,it has more water-stable aggregates of 〉5 mm; It has not significant impact on macro-aggregate content in different cropping pattern. Soil macro-aggregate content which in different cropping but same tillage pattern has different tendency. The analysis of correlation indicated that,macro-aggregate content is main factor affect to the mean weight diameter（MWD）,bulk density have influence to MWD too,however destruction rate only impact on MWD of soil water-stable aggregates.
出处
《水土保持学报》
CSCD
北大核心
2010年第1期252-256,共5页
Journal of Soil and Water Conservation
基金
国家"十一五"科技支撑计划重点项目(2006BAD15B06)
