塔克拉玛干沙漠腹地参考作物蒸散量与蒸发皿蒸发量的对比分析

利用2005-2010年塔克拉玛干沙漠腹地气象资料计算了极端干旱区塔克拉玛干沙漠腹地参考作物蒸散量(ET0),并与气象站蒸发皿蒸发量(Ep)进行了对比分析及影响因素的灰色关联度排序。结果表明:极端干旱区ET0最大值出现于7月,最小值则出现在1月;Ep最大值分别出现在6月,最小值出现在12月。灰色关联分析表明,在年时间尺度上与ET0关系最为紧密的气象因子是Umean,其次是Tmax,而影响Ep气象因子最为紧密的气象因子是Tmax,其次是Umean;在春、夏、秋、冬四个季节尺度上夏季对影响ET0和Ep的气象因子差异最大。ET0与Ep在春、秋、冬三个季节都成极显著关系,而在夏季呈显著线性关系,因此在不同时间尺度上二者可以进行互相替换。

Changes of reference crop evapotranspiration and pan evaporation in hinderland of Taklimakan Desert

Pan evaporation(Ep) and crop evapotranspiration(ET0),as a measurement of soil-plantation-atmosphere transfer system models,which influence the application of models and the precision of prediction,has traditionally been used for water use and water consumption of plant.The changing trend of pan evaporation and crop evapotranspiration are also attracting attention from the hydrological community worldwide due to its indicative meaning in hydrological cycles.In this article,compared the two results from Penman-Monteith formula and pan evaporation based on daily meteorological data from 2005-2010 of Tazhong weather station in hinderland of Taklimakan Desert,grey relational analysis was conducted characters of the pan evaporation,crop evapotranspiration and different effects of meteorological factors,and the correlations between ET0 and Ep were analyzed.The results indicate that there is the same trend in both crop evapotranspiration and pan evaporation of the years.The maximum of the ET0 appears in July and the minimum appears in January.However,the maximum of the Ep appears in June and the minimum appears in December.Meanwhile,the figures of reference crop evapotranspiroaion vary from 0.30 to 0.46.The grey relational analysis showed that there is a close correlation between ET0 and Umean,just ahead of Tmax.On the contrary,the pan evaporation is a strongly relation with Umean,then Umean.The scale of different seasons of ET0 and Ep has different affected of meteorological factors and the maximum meteorological factors of otherness appear the summer.The correlative analysis showed that there is a very significant correlation between ET0 and Ep with the spring,the autumn and the winter.Nevertheless,the relationships of ET0 and Ep are significant correlation in summer.The results of research are provided some scientific insights on the water use,water consumption of the shelterbelts along the Tarim Desert Highway as well as the management of groundwater.In addition,these results can also shed a light on the sustainability of shelterbelts along the Tarim Desert Highway.