罗雨,刘海军,李艳.北京地区参考作物蒸散量变化趋势及其主要影响因素分析[J].干旱地区农业研究,2010,28(1):34~38 |
北京地区参考作物蒸散量变化趋势及其主要影响因素分析 |
Changing trend and dominated meteorological variables of reference crop evapotranspiration in Beijing |
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DOI:10.7606/j.issn.1000-7601.2010.01.07 |
中文关键词: 参考作物蒸散量 Penman-Monteith公式 变化趋势 敏感性分析 |
英文关键词:reference crop evapotranspiration Penman-Monteith equation changing trend sensitivity analysis |
基金项目:北京市科技计划项目(D07050601510703);国家自然科学基金项目(50509025) |
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中文摘要: |
利用1951~2007年北京气象站的气象资料,采用FAO56 Penman-Monteith公式(PM公式),计算了北京地区每日的参考作物蒸散量(ET0),分析了北京地区各气象要素和ET0的变化趋势,利用敏感性分析找出影响ET0变化的主要因子。研究结果表明:在1951~2007年期间北京地区的平均相对湿度和日照时数呈下降趋势,平均温度呈升高趋势,平均风速呈现先增加(1951~1972年)后下降的趋势(1973~2007年);饱和水汽压差升高造成的ET0值正变化不仅抵消了净辐射降低对ET0造成的负影响,还使得参考作物蒸散量表现为逐渐增加趋势;敏感性分析显示相对湿度和温度是影响北京地区年ET0变化的主要因子;在年内,夏季(6~8月份)对ET0影响最大的因素为日照时数,在其它时间段内,温度对ET0的影响最大。 |
英文摘要: |
Daily reference crop evapotranspiration(ET0)in Beijing from 1951~2007 was computed with FAO Penman-Monteith equation (PM) to find the changing trends of meteorological variables and ET0 and to find the dominated meteorological variables of ET0 using a sensitivity analysis method. Results showed that in the past 57 years, the relative humidity and daily sunshine hours decreased, the air temperature increased, the average wind speed increased from 1951~1972, and then decreased during 1973~2007. Although net radiation had negative effect on ET0, the increasing of saturated vapour pressure deficit made ET0 increasing slowly. Sensitivity analysis on yearly ET0 indicated that the relative humidity and air temperature were two dominated meteorological elements to ET0 in Beijing area. Within a year, the number of daily sunshine hours is the dominating element to ET0 in summer (June~Aug.) and air temperature is in other seasons. |
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