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FOREST RESOURCES WANAGEMENT ›› 2010, Vol. 0 ›› Issue (2): 73-77.

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Study on Soil Erosiveness in the Area of Returning Farmland to Forest in Huangshui River Watershed of Qinghai Province

ZHAO Chuanchuan1, WANG Shi1, SUN Genxing1, YANG Qiaomei1, YANG Ninggui1, ZHANG Wenjuan1, DONG Xu2   

  1. 1. College of Resources & Environment, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China;
    2. Qinghai Provincial Forest Inventory and Planning Institute, Xining 810008, China
  • Received:2009-11-06 Revised:2010-03-09 Published:2020-12-14

Abstract: With the area of returning farmland to forest in Huangshui River watershed of Qinghai province in the years from 2000 to 2009 as a study object,research work was conducted on changes of soil erosiveness in different years of vegetation restoration and different vegetation types. Soil physical and chemical properties were measured by field investigation and experiment and soil erodibility (K-factor) was calculated by EPIC model.The conclusions showed that with the increase of returning farmland to forest years,soil porosity would become smaller gradually,the sand content was increased little,the silt content had a little decrease and the clay content was almost invariant.Soil organic matter gradually decreased in the previous seven years of returning farmland to forest,and then increased.There was some tendency indicating that soil erodibility would become smaller,particularly after nine years of returning farmland to forest. In the same year,the ability of improvement of soil erodibility was as follows: tree mixed forest>tree and shrub mixed forest>tree forest>shrub forest,and with the year increase the difference became bigger.

Key words: soil erodibility, returning farmland to forest, vegetation, Qinghai, Huangshui river

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