哈尼梯田灌区生态需水评价

Evaluation of ecological water demand in Hani terrace irrigated area

针对云南省元阳县哈尼梯田灌区特点与实际情况,选用层次分析法和数据包络分析法,综合考虑自然、社会、水资源、生态环境等方面因素,建立生态需水评价模型,对灌区2000年和2005年的生态需水状况进行对比分析。结果表明,生物丰度指数、径流系数、植被覆盖指数、干旱指数4个指标为影响生态需水的重要指标,灌区2005年的生态需水状况比2000年有所改善,与灌区实际情况基本相符。

Based on the characteristics and real conditions of the Hani Terrace Irrigated Area in Yuanyang County, Yunnan Province, and considering comprehensively the natural, social, water resources and ecological factors, a model for evaluating the ecological water demand was established using the analytic hierarchy process （AHP） and data envelopment analysis （DEA）. The model was applied to do the contrastive analysis of the ecological water demand in the irrigation area for the years of 2000 and 2005. The results showed that four indicators were important in predicting ecological water demand： the biological abundance index, the runoff coefficient, the vegetation index, and the drought index. The results also showed that the ecological water demand of the irrigation area in 2005 was improved over that in 2000, and this was basically supported by the actual conditions in the irrigation area.