庆阳市西峰区生态脆弱性评价  

Ecological vulnerability evaluation in Xifeng District of Qingyang City

作　　者：孙倩[1] 刘学录[1] 

机构地区：[1]甘肃农业大学资源与环境学院,甘肃兰州730070

出　　处：《甘肃农业大学学报》2012年第6期129-133,共5页Journal of Gansu Agricultural University

摘　　要：西峰区地处黄土高原丘陵沟壑区,是典型的生态脆弱区.根据导致该区生态环境脆弱的自然成因-结果表现因素,构建了该区生态脆弱性评价指标体系,运用变异系数法对西峰区10a来的生态脆弱性变化趋势进行了量化评价.结果表明:西峰区生态脆弱度指数随时间呈波动式下降趋势,由2000年的0.714 3下降到2009年0.490 3.经历了2000年的强度脆弱阶段到2009年的轻度脆弱阶段,西峰区生态环境呈现出良好状态发展趋势.人为因素是影响生态脆弱性的关键因素,西峰区脆弱生态环境具有不稳定性,对外界干扰较敏感的特性.Xifeng District located in loess hill gully area,where is the typical ecological fragile area.According to the factors leading to ecological vulnerability of this area,a scientific and objective evaluation index system was constructed,based on this system and using variation method of coefficient,variation tendency of ecological vulnerability of Xifeng District from 2000 to 2009 was evaluated.The results showed that the index of ecological vulnerability in Xifeng District showed a descending trend in fluctuation with time,descending from 0.714 3 in 2000 to 0.490 3 in 2009.Xifeng District went through the intense vulnerable stage in 2000,and then went into the mild vulnerable stage in 2009,its eco-environment developed toward the good stage.Based on the evaluation results,human factors was a key factor affecting the ecological fragility.The vulnerable ecological environment of Xifeng District was unstable and sensitive to external disturbance.

关 键 词：生态脆弱性评价 变异系数法 西峰区 

分 类 号：X171.1[环境科学与工程—环境科学]