Trends in reference evapotranspiration and its attribution over the past 50 years in the Loess Plateau, China: implications for ecological projects and agricultural production
Trends in reference evapotranspiration and its attribution over the past 50 years in the Loess Plateau, China: implications for ecological projects and agricultural production
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DOI：
10.1007/s00477-015-1203-5
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发表时间：
2016
影响因子：
4.2
通讯作者：
Zhongjie Shi;Li-hong Xu;Xiaohui Yang;Hao Guo;Linshui Dong;Aiyun Song;Xiao Zhang;N. Shan
中科院分区：
文献类型：
--
作者：
Zhongjie Shi;Li-hong Xu;Xiaohui Yang;Hao Guo;Linshui Dong;Aiyun Song;Xiao Zhang;N. Shan
参考蒸散量（ETo）是影响黄土高原生态工程实施、农业生产和水资源管理的重要水文因子，其长期变化是气候变化研究的重要内容。基于57个气象站的逐日数据，对1958-2011年ETo的时空格局及其驱动因子进行了评估。此外，还分析了农业种植和城市化对ETo趋势的影响。结果表明，该地区年、季ETo序列既有减少的趋势，也有增加的趋势。区域平均ETO系列经历了一个弱的逐年下降趋势。然而，更多的ETO系列被发现与增加的趋势。在夏季、冬季和生长季，土壤水分含量呈下降趋势，而在春季和秋季，土壤水分含量呈上升趋势。分析气象变量对ETO趋势的贡献表明，在大多数站点，风速是影响ETO变化的最主要因素。此外，种植和城市化也影响了ETo趋势。城市化对ETo趋势的影响比种植业更明显。气候变暖和干旱的趋势将影响该地区生态工程的实施，土壤干层的发生，沙漠化和农业生产。
In the water-limited Loess Plateau, reference evapotranspiration (ETo) is an important hydrological factor affecting the implementation of ecological projects, agricultural production, and water resource management, and its long-term variation is of great interest in climate change studies. Based on daily data from 57 meteorological stations, temporal and spatial patterns in EToand related driving factors were evaluated for the period 1958–2011. In addition, the influences of agricultural cultivation and urbanization on ETotrends were also analyzed. The results indicated both decreasing and increasing trends in annual and seasonal EToseries in this area. The area-average EToseries experienced a weak decreasing annual trend. However, more EToseries were found with increasing trends. More decreasing trends were found in summer, winter, and the growing season, but more increasing trends were seen in spring and autumn. Analysis of the contributions of meteorological variables on trends in EToshowed that wind speed was the most dominant factor affecting ETovariation at most stations. In addition, cultivation and urbanization also affected ETotrends. The impact on ETotrend was more obvious for the urbanization than cultivation. A warmer and drier trend would affect the implementation of ecological projects, the occurrence of dried soil layers, desertification, and agricultural production of the area.