干旱区研究2017，Vol.34Issue(5)：1027-1034,8.DOI:10.13866/j.azr.2017.05.09
西藏参考作物蒸散量时空变化特征与影响因素
Spatiotemporal Variation of Evapotranspiration of Referred Crops and the Affecting Factors in Tibet
摘要
Abstract
In order to have a thorough recognition of the variation patterns of reference evapotranspiration (ETo)in Tibet,in this study the Penman-Monteith method,recommended by the United Nations Food and Agriculture Organization in 1998,was used to estimate the daily ETo at 37 meteorological stations in Tibet during the period from 1981 to 2012.Also,the global aridity index (UNEP) proposed by the United Nations Convention on Combating Desertification was applied for the climatic regionalization in Tibet,accompanied by the application of spatial interpolation method and Mann-Kendall Test to explore the spatiotemporal variation of ET0 in different climatic zones in Tibet.The factors affecting the ET0 variation were explored through the partial correlation analysis.Results indicated that Tibet could be divided into the hyper-arid,arid,semiarid,dry sub-humid,moist sub-humid and humid climatic subregions,in which the semiarid subregion was the largest.A general decreasing trend of ET0 with a rate of 1.508 mm · a-1 was detected in whole Tibet in recent 32 years,and this process could be classified into three stages.The evapotranspiration was high during the period from 1981 to 1989,it was low after 1989,but it began to increase after 2005.The annual ET0 was decreased from the west to the east of the study area.The climatic factors contributing to the ET0 variation in Tibet were generally in an order of mean temperature ＞ sunshine duration ＞ mean wind speed ＞relative humidity,and the impacts of mean temperature,sunshine duration and mean wind speed in arid region were relatively higher than those in other climatic areas.关键词
参考作物/蒸散量/时空变化/成因分析/偏相关分析/西藏Key words
evapotranspiration/spatiotemporal variation/formation cause/partial correlation analysis/Tibet引用本文复制引用
张娜,金建新,佟长福,张红玲,屈忠义..西藏参考作物蒸散量时空变化特征与影响因素[J].干旱区研究,2017,34(5):1027-1034,8.基金项目
国家自然科学基金项目(51469020) （51469020）
中国水利科学院科研专项(Mk2014J06)资助 （Mk2014J06）
