青海东部主要农业区县域农业生态系统健康评价

Assessment of agro-ecosystem health of main agricultural area in eastern Qinghai

以青海东部主要农业区县域农业生态系统作为研究对象,以农业生态系统健康的内涵为基础,从活力、组织结构、恢复力、农业生态系统服务价值四方面选取17个指标构建了评价指标体系,并采用综合AHP法和熵值法的组合权重法确定了指标权重,最后应用综合评价模型对青海东部主要农业区县域农业生态系统的健康现状进行了评价。结果显示,研究区9个县的综合健康指数在0.300～0.600间变化,其中平安县农业生态系统处于"健康"状态,互助、民和、湟中、大通4县处于"亚健康"状态,其余4县处于"不健康"状态。分析表明,干旱是该地区农业生产的最大瓶颈,实现农业生产可持续发展的重点措施是做好水资源的"开源节流"并建立有效的生态补偿机制。

By choosing the county Agro-ecosystem of main agricultural area in eastern Qinghai as study area, 17 in- dicators were selected and indices system was built regarding vigor, organic structure, resilience, ecosystem service for a- gro-ecosystem health evaluation. The indices weights were determined by an integrated methods of AHP weighing and en- tropy weighing, finally, the health status of county-scale agroecosystem was evaluated in eastern Qinghai based on a com- prehensive evaluation model. The results showed that, the health indices vary in 0. 300 - 0. 600 for 9 counties in the study area, where Ping＇ an county is in the ＂Relatively healthy＂ state, 4 counties of Huzhu, Minhe, Huangzhong and Datong are in the ＂Sub-healthy＂ state, and the remaining 4 counties are in the ＂Unhealthy＂ state. The analysis showed that drought is the biggest bottleneck of agricultural production, so the major countermeasures for sustainable development of agricultural production is to ＂broaden sources of income and reduce expenditure＂ for water resources and to establish an effective mechanism for ecological compensation.