基于农户尺度的社会-生态系统对干旱的恢复力研究--以甘肃省榆中县为例

分析了延安燕沟流域近年来的降雨观测资料以及野外人工降雨试验数据,结果表明,燕沟流域年均输沙量比治理前的1997年减少了80%以上.在造成输沙量减少的原因中,降雨因素影响约占30%,而以植被建设为主的水土保持措施影响约占70%,证明植被恢复在流域综合治理中占有重要地位.

Social Ecosystem Based on Peasant Household Versus Drought Resilience -A Case Study in Yuzhong County of Gansu Province

Frequent drought disaster has been the crucial meteorological factor limiting the agricultural development and eco-environmental construction in the northwest area of China. Based on the household question-naire,the resilience of social-ecological system to droughtin Yuzhong County,Gansu Province was studied by integrating statistical approaches and GIS. Water-sensitive factors were selected in view of society,economy,and ecology so as to build social-ecological systems. The resilience of the systems was then calculated at the household level under arid environment according to the modified conceptual model of fragility degree. Results indicate that the resilience of Yuzhong County depends on the interactions between internal factors (social,economical,and ecological) and external factors (drought). Population quantity,soil moisture,and soil nutrients are the common water-sensitive factors to the household social-ecological systems in the three regions,whereas others belong to local villages.