PROGRESS IN GEOGRAPHY ›› 2010, Vol. 29 ›› Issue (3): 327-334.doi: 10.11820/dlkxjz.2010.03.011

• Original Articles • Previous Articles     Next Articles

Regional Differentiation of Drought South Slopes in the Gullies of the Loess Plateau

ZHAO Hui1, ZHU Qingke1, QIN Wei1|2, ZHANG Ying3|4, AN Yanchuan1, XUE Zhide5, LIU Zhongqi1   

  1. 1. Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education,
    Beijing Forestry University, Beijing 100083, China|
    2. Department of Sedimentation, China Institute of Water Resources and Hydropower Research, Beijing 100048, China|
    3. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China|
    4. Graduate University of Chinese Academy of Sciences, Beijing 100049, China|
    5. College of Resources and Environment, Northwest A &|F University, Yangling 712100, China
  • Online:2010-03-25 Published:2010-03-25

Abstract:

This paper systematically studied the drought south slopes of typical difficult site in the gullies of the Loess Plateau in order to resume and reconstruct vegetation based on the principle of local conditions. This paper took Xifeng in Gansu, Jixian in Shanxi, Ansai in Shaanxi, Guyuan in Ningxia as study areas, and used DEM with a resolution of 25 meters to research the regional differentiation characteristics of drought south slope in different type gully regions based on GIS. Results indicated that: (1) The area proportions of drought south slopes in different type gully regions are 45%-54%, and the ranking order is: the plateau gully region of Loess Plateau > the transitional region> the hill and gully region of Loess Plateau. (2) The distributions of drought south slopes in different types gully regions of the Loess Plateau are different. The plateau gully region of Loess Plateau has a positively skewed distribution and the other areas have an approximately normal distribution. The 5th sub-region of hilly and gully regions and the transitional region have a double-peak distribution. (3) The order of loess slope area proportion in the different type gully regions is the plateau gully region of Loess Plateau > the transition zone > the hill and gully region of Loess Plateau, that of gully slope area proportion is the hill and gully region of Loess Plateau > the transition zone > the plateau gully region of Loess Plateau,and that of valley flatland area proportion is the 5th sub-region of hilly and gully regions > the transition zone > the 2nd sub-region of hilly and gully regions> the plateau gully region of the Loess Plateau. (4) The area proportion of site types groups in different type gully regions except the plateau gully region of the Loess Plateau showd the following order: sunny side gentle slope group > sunny side steep risk slope group > slope top and bottom. The results can provide the scientific theory basis for drought-resistant afforestation and vegetation restoration in the Loess Plateau.

Key words: drought south slope, regional differentiation, the hill and gully region of Loess Plateau, the plateau gully region of Loess Plateau, the transition zone