| 摘要: |
| 以历史资料为依据，分析地处农牧交错带的武川县近50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50内该地入口增长了1．6倍多，耕地面积增长了0．63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，不合理的生态系统的结构是农牧交错带生态系统退化的直接原因。 |
| 关键词: 农牧交错带 生态系统结构变化 系统退化 生态退化 |
| DOI： |
| 修订日期：2002-06-18 |
| 基金项目:国家自然科学基金资助项目 (30 10 0 12 7)，国家“十五”科技攻关课题 (2 0 0 1BA5 0 8B12 )，国家重点基础研究发展规划资助项目 (G2 0 0 0 0 186 0 6 ) |
|
| Eco-systematical Structure Change and Its Impacts on Ecological Degradation in the Northern Ecotone |
|
|
|
| Abstract: |
| 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. |
| Key words: the Northern Ecotone,the eco system structure,ecological degradation |
