Advances in Earth Science ›› 2002, Vol. 17 ›› Issue (5): 739-747. doi: 10.11867/j.issn.1001-8166.2002.05.0739

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BOUNDARY LINE ON AGRO-PASTURE ZIGZAG ZONE IN NORTH CHINA AND ITS PROBLEMS ON ECO-ENVIRONMENT

ZHAO Ha-Lin,  ZHAO Xue-Yong,  ZHANG Tong-Hui,  ZHOU Rui-lian   

  1. Cold and Arid Region Environment and Engineering Research Institute,Lanzhou 730000,China
  • Received:2002-03-01 Revised:2002-06-10 Online:2002-12-20 Published:2002-10-01

ZHAO Ha-Lin, ZHAO Xue-Yong, ZHANG Tong-Hui, ZHOU Rui-lian. BOUNDARY LINE ON AGRO-PASTURE ZIGZAG ZONE IN NORTH CHINA AND ITS PROBLEMS ON ECO-ENVIRONMENT[J]. Advances in Earth Science, 2002, 17(5): 739-747.

North Agro-pasture zigzag zone located mainly in south edge on Inner Mongolia plateau and area along the line of Great Wall, the boundaries of east and south part are Lonjing, Anda, Qian'an, Changling, Kangping, Fuxin, Fengning, Huai'an, Hunyuan, Wuzai, Shenmu,Yulin and Huanxian, and that of west and north are Chenbaerhu, Wulanhaote, Linxi, Duolun, Tuoketuo, Etuoke and Yanchi.It involves 9 provinces and 106 counties that total area is 654 564 km2 and total population is 3135.6×104 and average density of population per km2 is 47.9 and ratio among farmland and woodland and pasture is 1.0∶1.17∶3.67. In recent tens years, There are some ecological problems in the zone inclusing desertification developing rapidly and land resources and its bearing capacity decreasing sharply and eco-environment worsening obviously and natural calamity appearing frequently. The causes of formation, expecting for  natural harmful factors and artificially strong disturbance, includes yet the history brand of desertification and northern moving of the zigzag zone in recent hundred years and economic geography. Degeneration eco-environment control in the zone should pay attention to replace poplar by local tree species progressively and to adopt banding afforestation ways combined with tree and shrub and grass.To establish a artificia1 steppe vegetation with scattered trees and to make its eco-barrier affects well.

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