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陕西关中地区参考作物蒸发蒸腾量变化及原因
引用本文:曹红霞,粟晓玲,康绍忠,孙华银.陕西关中地区参考作物蒸发蒸腾量变化及原因[J].农业工程学报,2007,23(11):8-16.
作者姓名:曹红霞  粟晓玲  康绍忠  孙华银
作者单位:1. 西北农林科技大学,教育部旱区农业水土工程重点实验室,杨凌,712100
2. 西北农林科技大学,教育部旱区农业水土工程重点实验室,杨凌,712100;中国农业大学,中国农业水问题研究中心,北京,100083
基金项目:国家自然科学基金;教育部高等学校博士学科点专项科研基金;水利部黄河水利委员会基金
摘    要:根据关中地区30个气象站41年的气象资料,采用FAO推荐的Penman-Monteith公式计算参考作物蒸发蒸腾量(ET0),分析了陕西关中地区ET0的变化及原因,结果表明,从长期来看,关中地区ET0在减少趋势的基础上表现出周期性变化,从阶段性来看,1980年之前和之后则主要表现为增加趋势。关中地区年内ET0的最大值在1980年前主要出现在6月,1980年以后则主要出现在6月和7月,且以7月为多;1980年后5~8月ET0所占比值在减少,但仍在全年中占50%以上。关中地区平均气温、最高气温和最低气温表现为增加趋势,风速、日照时数和相对湿度表现为减少趋势。关中地区ET0与平均气温、最高气温和最低气温表现为不显著正相关,与风速和日照时数表现为显著正相关,与水汽压表现为显著负相关,与年降水量表现为不显著负相关,近一半地区的ET0与年蒸发量显著正相关。对关中地区ET0影响显著的气象因子的顺序为:风速〉日照时数〉水汽压〉年蒸发量。即风速和日照时数的减少趋势是引起关中地区ET0降低趋势的主要原因。

关 键 词:陕西关中地区  参考作物蒸发蒸腾量(ET0)  气象因子  Penman-Monteith公式
文章编号:1002-6819(2007)11-0008-09
收稿时间:2007-01-05
修稿时间:2007-06-04

Changes of reference crop evapotranspiration and causes in Guanzhong Region of Shaanxi Province
Cao Hongxi,Su Xiaoling,Kang Shaozhong and Sun Huayin.Changes of reference crop evapotranspiration and causes in Guanzhong Region of Shaanxi Province[J].Transactions of the Chinese Society of Agricultural Engineering,2007,23(11):8-16.
Authors:Cao Hongxi  Su Xiaoling  Kang Shaozhong and Sun Huayin
Institution:Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-arid Areas of the Ministry of Education, Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-arid Areas of the Ministry of Education, Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-arid Areas of the Ministry of Education, Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China;Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-arid Areas of the Ministry of Education, Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China
Abstract:Changes of reference crop evapotranspiration(ET0) and its causes were analyzed by the computed ET0 using Penman-Monteith equation which was recommended by FAO according to weather data of 41 years for 30 weather stations in Guanzhong Region of Shaanxi Province(Central Shaanxi Plain).The results show that ET0 presents periodical changes based on decreasing trend in the long term and increasing trend before and after 1980 respectively in the short term.The maximum ET0 appeared on June before 1980 and on June and July after 1980.ET0 percentage between May and August in a year after 1980 is less than the one before 1980,but still is over 50%.The tendencies for mean,maximum and minimum temperature are to increase and those for wind speed,sunlight hours and relative humidity are to decrease.ET0 is related positively to wind speed,sunlight hours insignificantly,and is related negatively to water vapor insignificantly.The influence capacity of weather factors on ET0 is as follows: wind speed>sunlight hours>water vapor>yearly evaporation.The decline trend of ET0 is mainly caused by the decrease of wind speed and sunlight hours.
Keywords:Guanzhong Region of Shaanxi  reference crop evapotranspiration(ET0)  weather factors  Penman-Monteith equation
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