GEOGRAPHICAL RESEARCH ›› 2008, Vol. 27 ›› Issue (5): 1150-1161.doi: 10.11821/yj2008050018

• Earth Surface Processes • Previous Articles     Next Articles

The dynamic changes of ecological security in northern China

LI Yue-chen1,2   

  1. 1. College of Geographical Science, Key Laboratory of GIS Application, ChongqingNormal University, Chongqing 400047, China;
    2. College of Resources and Environmental Science,Chongqing University, Chongqing 400044, China
  • Received:2007-10-11 Revised:2008-03-03 Online:2008-09-25 Published:2008-09-25
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Regulation and rebuilding of landscape structure are the keys to redevelop the regional safe ecological pattern. The eco-environment of the 13 provinces in northern China is relatively fragile. In order to understand the eco-environment feedback mechanism and seek a way to optimize landuse/cover spatial pattern under ecological security, the temporal and spatial dynamic changes of the ecological security in northern China during the 11-year period from 1989 to 1999 is analyzed based on the landscape ecology theoretic, semivariogram and GIS in this paper. The results show that: (1)The eco-environmental quality in the study area showed an obvious decreasing trend. The eco-environmental quality in the areas with high ecological security decreased more slowly on the whole. The main reasons are that the eco-environment is better,flexible and steady. So it has higher capability to resist the outside disturbances. (2)The level of ecological security in the east region was more secure than that in the west and central regions.For each sub-region, the level of ecological security in Northwest China was the lowest; Inner Mongolia was secondly; Shaanxi and Shanxi provinces that lie in the Loess Plateau were in the third place; North China was higher than the above three sub-regions; and the three provinces in Northeast China were the highest. (3)The changes of the indexes of ecological security could be divided into three types: ①the indexes of the level of ecological security increased firstly and then decreased, including Beijing, Liaoning, Shanxi and Qinghai; ②the indexes of the level of ecological security decreased and then increased, including Heilongjiang, Jilin, Inner Mongolia, Ningxia; ③the indexes of the level of ecological security decreased continuously, including Tianjin, Hebei, Shaanxi, Gansu, and Xinjiang. During the ten years, the levels of ecological security decreased at different speeds except Northeast China.

Key words: ecological security, dynamic changes, 13 provinces in northern China