译 名：
Land Gradient and Reclamation Ratio on Loess Plateau Based on GIS
作 者：
PENG Wen-ying, ZHANG Ke-li, LIU Li, WEI Hai-yan (Department of Resources and Environmental Sciences, Beijing N ormal University, Beijing 100875)
关键词：
land gradient; steep sloping plantation; recla mation ratio
摘 要：
The soil erosion on Loess Plateau is one of the most serious problems, which re sulted in series of severe environment question in the Yellow River valley. Land gradient and reclamation ratio are important factors to soil erosion. On the base of GIS method, land resources on Loess Plateau was analyzed , and with the degree of ground gradient varying, the land proportion, the plant ation proportion, the reclamation ratio, and their zone distribution were ascert ained. The results showed, the counties that the proportion of land and plantat ion gradient exceeding 15° and 25° is bigger mainly distribute in the several branches valley in the middle reach of Yellow River and Liupan mountain and its west, in which reclamation ratio of land gradient ≥15° exceed 0.1, some extend ing 0.5. The several branches valley in the middle reach of Yellow River and Liu pan mountain area are not only the mainly concentrated section for steep sloping plantation on Loess Plateau, but also the area of high erosion.
