Spatiotemporal variation and driving forces of reference evapotranspiration in Jing River Basin, northwest China
Spatiotemporal variation and driving forces of reference evapotranspiration in Jing River Basin, northwest China
复制标题
西北泾河流域参考蒸散量时空变化及驱动力
DOI：
10.1002/hyp.10541
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发表时间：
2015
影响因子：
3.2
通讯作者：
Wang Yunni
中科院分区：
文献类型：
--
作者：
Xu Lihong;Shi Zhongjie;Wang Yanghui;Zhang Shulan;Chu Xinzheng;Yu Pengtao;Xiong Wei;Zuo Haijun;Wang Yunni
蒸散是水文循环的一个重要组成部分，它综合了大气需求和地表条件。研究参考蒸散量的时空变化有助于了解气候变化及其对水文过程和水资源的影响。本研究利用中国泾河流域37个气象站1960 - 2005年的逐日资料，采用FAO‐56 Penman-Monteith方法估算了泾河流域的ETo。通过Mann-Kendall检验在年度、季节和月度时间尺度上检测ETO趋势。敏感性系数被用来研究重要的气象变量对ETO的贡献。分析了农业生产活动尤其是灌溉活动对ETo的影响。我们发现，除秋季呈增加趋势外，流域大部分地区的ETo在所有季节均呈下降趋势。平均最高温度一般是最敏感的参数，相对湿度，太阳辐射，平均最低温度和风速。风速是影响ETO下降趋势的最主要因素。农业站及灌溉站的ETo较天然站及非灌溉站显著减少，主要是由于风速及日照时数较天然站及非灌溉站显著减少、气候变暖有所缓和，以及相对湿度较天然站及非灌溉站显著增加。地形也影响ETo的变化和气象变量对ETo的敏感系数。深入了解气候变化对生态环境的响应，有助于提高农业生产和水资源利用效率，改善泾河流域生态环境。版权所有© 2015约翰威利父子有限公司.
Evapotranspiration is an important component of the hydrological cycle, which integrates atmospheric demands and surface conditions. Research on spatial and temporal variations of reference evapotranspiration (ETo) enables understanding of climate change and its effects on hydrological processes and water resources. In this study, ETowas estimated by the FAO‐56 Penman–Monteith method in the Jing River Basin in China, based on daily data from 37 meteorological stations from 1960 to 2005. ETotrends were detected by the Mann–Kendall test in annual, seasonal, and monthly timescales. Sensitivity coefficients were used to examine the contribution of important meteorological variables to ETo. The influence of agricultural activities, especially irrigation on ETowas also analyzed. We found that EToshowed a decreasing trend in most of the basin in all seasons, except for autumn, which showed an increasing trend. Mean maximum temperature was generally the most sensitive parameter for ETo, followed by relative humidity, solar radiation, mean minimum temperature, and wind speed. Wind speed was the most dominant factor for the declining trend in ETo. The more significant decrease in ETofor agricultural and irrigation stations was mainly because of the more significant decrease in wind speed and sunshine hours, a mitigation in climate warming, and more significant increase in relative humidity compared with natural stations and non‐irrigation stations. Changes in EToand the sensitivity coefficient of meteorological variables in relation to ETowere also affected by topography. Better understanding of EToresponse to climate change will enable efficient use of agricultural production and water resources, which could improve the ecological environment in Jing River Basin. Copyright © 2015 John Wiley & Sons, Ltd.