Regional Differentiation of Drought South Slopes in the Gullies of the Loess Plateau
Online published: 2010-03-25
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.
ZHAO Hui1, ZHU Qingke1, QIN Wei1|2, ZHANG Ying3|4, AN Yanchuan1, XUE Zhide5, LIU . Regional Differentiation of Drought South Slopes in the Gullies of the Loess Plateau[J]. PROGRESS IN GEOGRAPHY, 2010 , 29(3) : 327 -334 . DOI: 10.11820/dlkxjz.2010.03.011
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