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›› 2005, Vol. 22 ›› Issue (4): 447-453.DOI: 10.7523/j.issn.2095-6134.2005.4.008

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The Effect of Landscape Pattern on Soil Erosion in Loess Plateau Catchment---Take Huangjia Ercha Catchment as an Example

YOU Zhen1,2, LI Zhan-Bin1,3   

  1. 1. State Key Laboratory of Soil Erosion and Dry Land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China;
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China;
    3. Xi’an University of Technology, Xi’an 710000, China
  • Received:2004-06-09 Revised:2004-10-08 Online:2005-07-15

Abstract:

In the catchments of Loess Plateau, the landscape pattern has been formed mainly by human activities. So the land use is the key factor of landscape patterns. It is very valuable to pay attention to the effect of landscape patterns on soil erosion. The paper takes the Huangjia Ercha catchment as an example, analyses its landscape patterns in several parts : the patch’s area, the patch’s pattern direction and the patch’s arrange order. We select the patch’s area rate and the patch’s fragment extent to show the patch’s area ; Select the connection extent along the contour and the connection extent along the slope to show the patch’s pattern direction ; Select the patch’s relative position to show the patch’s arrange order. Combining the landform, we divide the catchment into two parts : the sun slope and the shade slope. Then we calculate their landscape pattern factors, analyze the effect of landscape on soil erosion. The results show that : artificial grassland is the main land use type, the rate of tilth is little in sun slope, artificial grassland is connected well along the contour. The landscape pattern in sun slope is in favour of soil and water conservation. But in the shade slope, tilth is the main land use type, the tilth is connected well along slope, and the landscape pattern can aggravate soil erosion. So soil erosion is more intense in the shade slope than that in the sun slope.

Key words: land use, landscape pattern, soil erosion, Loess Plateau, catchment

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