摘要
为解决气候变化与灌溉对区域参考作物蒸散量(ET0)的影响问题,利用Penman-Monteith公式计算都江堰灌区5个站点60年逐日蒸散量,定性定量研究气候变化与灌溉对灌区蒸散量的影响。结果表明:近60年灌区蒸散量总体呈降低趋势。各气候变量对蒸散量的敏感性由高到底依次为相对湿度、平均温度、日照时数、风速;风速、日照时数的降低是蒸散量下降的主要原因,灌区建设前后相比,遂宁站风速的下降趋势远大于全国风速的下降趋势,灌溉主要使区域风速显著下降。在春、夏、秋、冬、主要作物生长期,蒸散量变化的主控因素分别为平均温度、相对湿度、平均温度、相对湿度和相对湿度。灌区灌溉与气候变化对蒸散量影响分别为49.97%、50.03%,因此气候变化与灌溉是引起灌区蒸散量变化的重要原因。
In order to study the impacts of climate change and irrigation on reference crop evapotranspiration( ET0),the daily evapotranspirations estimated by Penman-Monteith equation in 5 meteorological stations of Dujiangyan irrigated area were used to analyze the trend of evapotranspiration. The results showed that in recent 60 years,the evapotranspiration in the area had a downward trend as a whole,relative humidity was tsensitive to evapotranspiration in these climate variables,and mean air temperature was the second,sunshine duration and wind speed were lower. In recent 60 years,the reduce of wind speed and sunshine duration was the main reason of the declining of evapotranspiration. Compared with the prior to the construction of irrigation area and irrigation area expansion period,the down trend of wind speed was far higher than that nationwide,so the influence of irrigation on local climate of the area realized by reducing wind speed in the area. In spring,summer,autumn,winter,and the main crop growth period,the main control factors of evapotranspiration's change were mean air temperature,relative humidity,mean air temperature,relative humidity and relative humidity. The influences of irrigation and climate change on evapotranspiration in Dujiangyan irrigation area were 49. 97% and 50. 03%,respectively,so climate change and irrigation were important factors to influence evapotranspiration in the irrigation area.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2016年第S1期69-79,共11页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(51009101)
水利部公益性行业科研专项经费项目资助(201101039)
南方丘区节水农业研究四川省重点实验室开放基金项目(JSSYS2014-C)
