农牧交错带生态系统结构变化及其对系统退化的影响

Eco-systematical Structure Change and Its Impacts on Ecological Degradation in the Northern Ecotone

以历史资料为依据 ,分析地处农牧交错带的武川县近 5 0年的生态系统的结构变化及其对系统退化的影响。结果表明 ,近 5 0年内该地人口增长了 1.6倍多 ,耕地面积增长了 0 .6 3倍 ,小牲畜数量增长了 9倍多。认为人口增加是生态系统退化的根本原因 。

Eco systematical structure change and its impacts on ecological degradation have been studied according to the 50 year historical statistics and research data in the Northern Ecotone. Now the population is 2.6 times, the cultivated area is 1.63 times, the number of small livestock is more than 10 times what they were in 1950. The excessively growing population is the root cause and the irrational eco systematical structure is the direct cause of the degradation in the eco system.