山西省参考作物蒸散量的时空变化特征及影响因素分析

孙晶华; 张吴平; 吴亚楠; 魏 强

引用本文:	孙晶华,张吴平,吴亚楠,等.山西省参考作物蒸散量的时空变化特征及影响因素分析[J].灌溉排水学报,2017,36(4):.
	SUN Jinghua,ZHANG Wuping,WU Yanan,et al.山西省参考作物蒸散量的时空变化特征及影响因素分析[J].灌溉排水学报,2017,36(4):.

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山西省参考作物蒸散量的时空变化特征及影响因素分析
孙晶华，张吴平，吴亚楠，魏强
山西农业大学资源环境学院，山西太谷 030801

摘要:

利用山西省及周边地区共计35个气象站点1957—2014年的逐日气象数据，使用Penman-Monteith公式计算参考作物蒸散量（ET0），采用一元线性回归和反距离加权插值法分析ET0的时空变化特征，并采用逐步回归分析对ET0的影响因素进行研究。结果表明，①年ET0随时间的变化特征呈现混合模式，以下降趋势为主。②多年平均ET0空间分布差异显著，区域内存在2个高值区、2个次高值区和2个低值区。秋季ET0的空间分布特征与年ET0的空间分布最为接近，而冬季，春季和夏季ET0的空间分布特征与年ET0的空间分布相差较大。③各站点年ET0受同时期气象要素的影响程度由大到小的排序为：风速、温度、相对湿度、日照时间或降水量。全省不同站点多年平均年ET0受气象要素的影响程度由大到小的排序为：风速、温度、相对湿度、日照时间、降水量。全省不同站点多年平均年ET0受地理要素的影响程度由大到小的排序为：海拔、纬度。

关键词: 山西省；参考作物蒸散量；时空变化；影响因素

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Spatio-Temporal Variations of Reference Crop Evapotranspiration and Factors Affecting It in Shanxi Province

SUN Jinghua, ZHANG Wuping, WU Yanan, WEI Qiang

College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China

Abstract:

Spatio-temporal variation of reference evaporation (ET0) in Shanxi Province was calculated using the Penman-Monteith model based on daily climatic data collected from 35 meteorological stations in Shanxi and its proximal regions from 1957 to 2014, using a simple linear regression with an inverse distance-weighting method. We also analyzed the factors that affect the variation of ET0 using a stepwise regression. The results showed that: ①The change of annual average ET0 fluctuated but with a declining trend. ②The multi-year average of ET0 varied spatially with two peaks, two sub-peaks and two troughs; the spatial distribution of multi-yearaverage of ET0 was similar to the distribution of ET0 in autumn, but differed considerably from that in spring, winter and summer. ③In each meteorological station, the factors that significantly affected the annual average ET0 was in order of wind speed, temperature, relative humidity, sunshine hours or precipitation, while for the average over the province, the factors that affected the ET0 significantly was in the order of wind speed, temperature, relative humidity, sunshine hours and precipitation. Also, the impact of altitude on ET0 was more significant than latitude.

Key words: Shanxi province; reference crop evapotranspiration; temporal-spatial variation; influencing factors