青海省农业灌溉耗水系数影响因素分析

Influence Factor Analysis of Water Consumption Coefficient of Agricultural Irrigation in Qinghai Province

灌溉耗水系数是灌区管理水平的重要参考指标。在青海省黄河干支流及西北内陆河流域典型农业灌区,研究了不同空间尺度上农业灌溉水循环规律,率定了青海省典型灌区耗水系数。在此基础上,将影响耗水系数的相关因素按影响性质分类,以层次分析法进行重要性排序,遴选出农业灌区耗水系数关键影响因素,并确定其影响方向和程度。结果表明,田间综合渗漏系数、非节水灌溉比率、地下水平均埋深调整系数、斗农渠退水率、提灌方式占比等因素对农业灌区耗水系数影响较为重要。根据分析结果为加强农业灌区水资源管理提出了相关建议。

Water consumption coefficient is an important reference index of irrigation area management level. Agricultural irrigation water cycle law of different spatial scales was researched and water consumption coefficient of agricultural irrigation in Qinghai province was calibrated in typical agricultural irrigation area of the main stream and tributary of the Yellow River and the continental river basin in the northwest in Qinghai province. On this basis, the influence factors of water consumption coefficient were classified according to the factors ＇ properties. The order of importance was based on analytic hierarchy process method（AHP）. Key influence factors of agricultural irrigation water consumption coefficient were selected and its direction and degree of influence were determined. The results showed that such five Influence factors as comprehensive coefficient of seepage field, without water-saving irrigation ratio, average groundwater depth adjustment coefficient,bucket ditches depletion rate and lift irrigation rate were more sensitively influenced the agricultural irrigation water consumption coefficient. According to the analysis results,suggestions could be put forward for strengthening agricultural irrigation water management.