基于生态足迹的定西市人地关系动态研究

The Study of Man-land Relationship in Dingxi City Based on Ecological Footprint

利用生态足迹模型,对甘肃省定西市2001～2008年耕地生态足迹和生态承载力进行分析。结果表明,研究时段内定西市人均耕地生态足迹经历了先降后升再降的变化过程,但是总体上呈现增加的趋势,由2001年的1.101 hm^2增加到2008年的1.146 hm^2,增长了4.09%。人均耕地生态承载力经历了先降后升再降再升4个阶段,但总体上呈减少的趋势,由2001年的0.177 hm^2减少到2008年的0.167 hm^2,下降幅度达到5.65%,定西地区生态承载力在逐渐削弱。耕地人均生态赤字呈增加趋势,由2001年的0.924 hm^2增加到2008年的0.979 hm^2,增长5.95%,说明定西市耕地生态系统存在不稳定性。耕地生态超载指数呈现出增长趋势,由2001年的5.211增加到5.860,增幅达12.45%,耕地可持续指数呈减小趋势,由2001年的0.139减小到2008年的0.127,说明定西耕地的超负荷状态不断加剧,土地可持续性不断下降,环境压力越来越严峻。

Based on the ecological footprint model,the dynamic change of ecological footprint and ecological capacity of cultivated land in Dingxi City,Gansu Province from 2001 to 2008 was analyzed. The results indicated that the ecological footprint of cultivated land per capita in Dingxi obtained a＂decreased first,then increased and decreased last＂tendency,increased from 1. 101 hm^2 in 2001 to 1. 146 hm^2 in 2008,it increased by 4. 09%. The ecological capacity of cultivated land per capita obtained a＂down-up-down-up＂tendency,declined from 0. 177 hm^2in2001 to 0. 167 hm^2 in 2008,it was dropped by 5. 65%. The ecological capacity of cultivated land per capita in Dingxi was gradually weakened.During this period,the ecological deficits of cultivated land were increased in total. It was increased from 0. 924 hm^2 in 2001 to 0. 979 hm^2in2008. The ecological system of cultivated land was instability. The overload index of cultivated land was increased from 5. 211 in 2001 to 5. 860 in 2008,and the sustainable index of cultivated land was declined from 0. 139 in 2001 to 0. 127 in 2008. The overload state of cultivated land was growing,the sustainable of cultivated land was declined,and the environment pressure was more severe.