Study on soil aggregate stability of farmland based on Le Bissonnais method in the black soil region, Northeast China
ZHANG Xiao-cun1,3, ZHENG Fen-li2,*
(1 College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi′an 710062, Shaanxi, China;2 The State Key Laboratory of Soil Erosion and Dry Land Farming of Loess Plateau , Institute of Soil and Water Conservation, Chinese Academy Sciences and Ministry of Water Resource, Yangling 712100, Shaanxi, China;3 Department of Urban and Rural Development Management Engineering, Shangluo University, Shangluo 726000, Shaanxi, China)
Abstract:
The composition and stability of aggregate are used as indicators for soil structure and soil quality. The aggregate size distribution and aggregate stability in black soil were measured by Le Bissonnais method. The aggregate size distribution of aggregates after fast wetting (FW), slow wetting (SW) and wet stirring (WS) treatments was significantly affected by treatment method. The FW treatment had the largest aggregate disruption while WS treatment the lowest, the order of MWD was WS>SW>FW. It suggested that aggregate breakdown in black soil was mainly caused by the compression of air entrapped inside aggregates and clay swelling during wetting while small mechanical stirring the least. There was a significant relation between MWDFW, MWDSW and organic matter. The aggregate stability indices were significantly negatively related to clay content,which suggested that the organic matter is the main cementing and stabilization agent of aggregate, and clay content affects the aggregate stability.
KeyWords:
Le Bissonnais method; black soil; aggregate stability; organic matter
