Acta Geographica Sinica ›› 2005, Vol. 60 ›› Issue (3): 519-525.doi: 10.11821/xb200503019

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Field Survey on Water Erosion of the Rural Settlements in the Loess Hilly-gully Area of Northern Shaanxi Province

GAN Zhimao, YUE Dapeng, GAN Rui, ZHA Xiaochun   

  1. College of Tourism and Environment Science, Shaanxi Normal University, Xi'an 710062, China
  • Received:2004-02-26 Revised:2005-02-01 Online:2005-05-25 Published:2005-05-25
  • Supported by:

    Combined research fund item between the National Natural Science Foundation of China & the Yellow River Water Conservancy Committee of China's Water Conservancy Ministry, No.50279019

Abstract:

After observing the soil erosion of rural settlements formed by rainfalls (water erosion) based on field survey in northern Shaanxi province, this paper draws the following conclusions. (1) The average runoff coefficient of rural settlements is 0.335. The maximum runoff coefficient is 0.44, which exists in Yan'an county. The runoff coefficient in Yulin city and Suide county is 0.293 and 0.272 respectively, relatively small. Among the land-use types of rural settlements, the runoff coefficient of road land and yard is greater (separately 0.39 and 0.377), and the runoff coefficient of open space between houses is smaller (0.277). (2) The average runoff-contained sediment amount of open space between houses is the greatest (52.54 g/L), that of settlement yards is the smallest (17.19 g/L), and that of road land is placed in the middle (41.42 g/L). (3) The average erosion intensity of the rural settlements in northern Shaanxi Provence is 5434 t/km2·a, falling into the category of severity erosion. The erosion intensity of road land and open space between houses is respectively 7348 and 6873 t/km2·a, greater than that of the settlement yard (2081.7 t/km2·a). (4) The change of soil erosion of rural settlements is affected more prominently by human activities. It concludes that soil erosion of rural settlements on the Loess Plateau is quite severe and has its particularity. Therefore it can not be ignored and must be paid attention to its research and prevention.

Key words: Shaanxi Province, loess hilly-gully area, rural settlements, water erosion of soil