四川省湿润气候区参考作物蒸散量趋势变化及成因分析

武剑飞; 康银红; 梁友鹏

引用本文:	武剑飞,康银红,梁友鹏.四川省湿润气候区参考作物蒸散量趋势变化及成因分析[J].灌溉排水学报,0,():-.
	Wu Jianfei,Kang Yinhong,Liang Youpeng.四川省湿润气候区参考作物蒸散量趋势变化及成因分析[J].灌溉排水学报,0,():-.

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四川省湿润气候区参考作物蒸散量趋势变化及成因分析
武剑飞,康银红,梁友鹏
四川农业大学水利水电学院

摘要:

【目的】分析四川省湿润气候区参考作物蒸散量（ET0）的趋势变化及其影响因子，以期为农业灌溉提供合理的依据。【方法】根据雅安市1954-2009年逐日的气象资料，采用Penman-Monteith（PM）公式计算ET0，通过气候倾向率、Mann-Kendall法、通径分析对研究区域近56年ET0的趋势变化与成因进行分析。【结果】ET0年际变化不稳定，多年平均值为861.2mm，且呈现极显著的下降趋势（z=-3.06<-1.96），气候倾向率为9.3mm/10a；相对湿度无显著性下降趋势（z=-0.52），风速（z=-7.09）、日照时数（z=-2.61）、净辐射（z=-2.64）在1954-2009年都呈现显著性下降趋势，而日平均温度（z=2.96）呈现显著性上升趋势；影响ET0的因素依次为净辐射、相对湿度、风速、日平均气温；采用辐射法中Pristley-Taylor法计算得到的ET0与PM法计算下的ET0相近。【结论】雅安市多年平均ET0呈显著性下降趋势；日照时数是影响ET0减少的主要因素；在气象资料缺失的湿润地区，可以采用Pristley-Taylor法代替PM公式来计算ET0。

关键词: 参考作物蒸散发;Mann-Kendall检验;通径分析

DOI：

分类号:S161.4；S274.4

基金项目:国家自然科学基金(41601292)；农业部农业水资源高效利用重点实验室开放课题(2017002)

Trend change and causes analysis of reference crop evapotranspiration in the humid climate region of Sichuan Province

Wu Jianfei¹, Kang Yinhong², Liang Youpeng²

1.College of Water Conservancy and Hydropower Engineering,Sichuan Agriculture University,Sichuan Yaan;2.College of Water Conservancy and Hydropower Engineering ,Sichuan Agriculture University

Abstract:

【Objective】To provide reasonable basis for agriculture irrigation, this paper analyzed the trend change and effect factors of reference crop evapotranspiration（ET0）in humid region of Sichuan Province.【Method】This paper employed the Penman-Monteith equation to calculate ET0 with the daily meteorological data from 1954 to 2009 in Ya’an. Using the climate trend rate, Mann-Kendall test and path analysis, the trend variation and causes of ET0 were analyzed during the past 56 years for this region.【Result】The annual variation of ET0 was unstable with average of 861.2mm, and showed significantly decreasing trend at average rates of 9.3mm/10a. There is no significant decreasing trend for relative humidity（z=-0.52）, while wind speed（z=-7.09）, sunshine hours（z=-2.61）and net radiation（z=-2.64）all decreased significantly, and the daily mean temperature（z=2.96）rose significantly. With the path analysis, it was presented that the factors which affected ET0 were net radiation, relative humidity, wind speed and daily average temperature in sequence; The value of ET0 calculated by Pristley-Taylor was similar to the one of PM.【Conclusion】The annual average ET0 in Ya’an has significant decreasing trend. The sunshine hours is the main factor leading to the reductions of the ET0. Pristley-Taylor method can be used to calculate ET0 for the humid area without meteorological data.

Key words: Reference crop evapotranspiration; Mann-Kendall test; Path analysis