JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (2): 287-298.doi: 10.11849/zrzyxb.20141207

• Resource Evaluation • Previous Articles     Next Articles

Research on the Effect of Vegetation and Slope Aspect on the Stability and Erodibility of Soil Aggregate in Loess Hilly Region Based on Le Bissonnais Method

LI Ya-yun1, LIU Lei1, AN Shao-shan1, 2, ZENG Quan-chao1, 3, LI Xin3   

  1. 1. College of Resource and Environment, Northwest A & F University, Yangling 712100, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Research Center of Soil and Water Conservation and Ecological Environment, CAS, Yangling 712100, China;
    3.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-09-15 Online:2016-02-25 Published:2016-02-25
  • Supported by:
    National Natural Science Foundation of China, No.41171226; Natural Science Basic Research Program of Shaanxi, No.2011JM5011; Fundamental Research Funds for the Northwest A & F University, No.Z109021514

Abstract: In this article, the distribution characteristics, stability and erodibility of soil aggregate in three zones of forest, forest-steppe and steppe on the Loess Plateau are studied with the Le Bissonnais (LB) method. The effect of vegetation and slope aspect on the characteristics and erodibility of soil aggregate is also discussed. The results show that: 1) for the surface soil (0-20 cm) in different vegetation zones, both the content of soil aggregate (R0.2) and the mean weight diameter (MWD) are less on sunny slopes than on shady slopes, while the soil erodibility factor K is a little bigger on sunny slopes than on shady slopes with no significance. This implies that both the stability and erodibility of soil aggregate are slightly higher on the shady slope than on the sunny slope in the three vegetation zones in hilly loess region, but the differences are not significant. 2) In the surface layer (0-20 cm) under different vegetation, R0.2 and MWD decrease as follows: forest > forest steppe > steppe, while soil erodibility factor K decreases in the following order: steppe> forest-steppe > forest. This suggests that the stability and anti-erosion ability of soil aggregate in the forest vegetation zone is the highest. 3) Under processes of WS (wet-stirring sieving method) and FW (fast-wetting sieving method), there are significant difference between samples in forest zone and in steppe zone in both the soil stability and the soil erodibility (R0.2, MWD, K value), especially under the process of FW. The stability and erodibility of soil in forest-steppe zone are in between. A conclusion can be drawn that in the hilly loess zone, the stability and the anti-erosion ability of soil aggregate is ever increasing from north to south. The stability and the anti-erosion ability of soil aggregate is significantly higher in the southern forest zone than in the northern steppe zone.

CLC Number: 

  • S157