Acta Geographica Sinica ›› 2003, Vol. 58 ›› Issue (3): 464-469.doi: 10.11821/xb200303017

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Change about Soil Erosion and Soil Properties in Reclaimed Forestland of Loess Hilly Region

ZHA Xiaochun1, TANG Keli2   

  1. 1.College of Tourism and Environment Science, Shaanxi Normal University, Xi'an 710062, China; 2.Institute of Soil and Water Conservation, CAS and Ministry of Water Resources, Yangling 712100, China
  • Received:2002-10-09 Revised:2002-12-05 Online:2003-05-25 Published:2003-05-25
  • Supported by:

    National Natural Science Foundation of China, No.19832060

Abstract:

Based on the data observed from 1989 to 1998 in Ziwuling, the change of soil erosion and soil physico-mechanical properties was studied after forestland reclamation. When the man-induced factors changed the eco-environment by reclaiming forestlands, the intensity of man-made soil erosion in reclaimed lands was 1000 times more than that of the natural erosion to forestlands. From the analysis of soil physical mechanics properties, the clay content and physical clay content decreased 2.74% and 3.01% respectively, and the > 0.25 mm water stable aggregate content also decreased 58.7%, the soil unit weight increased and the soil shear strength decreased, all of which were easier to cause soil erosion. The results of the correlation analysis showed that > the 0.25 mm water stable aggregate content was the maximum affecting factor to soil erosion, the partial correlated coefficient was 0.9728, and then were soil coarse grain and soil shear strength, the partial correlated coefficients were 0.8879 and 0.6020 respectively. The relation between the >0.25 mm water stable aggregate content, the soil sheer strength and the soil erosion intensity were analyzed.

Key words: Loess, reclaimed forestland, soil erosion, soil physico-mechanical properties