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ET_0计算公式设定条件下冠层阻力的实验率定研究 被引量:3

Basic Resear_ch and Experiment Rate of Surface Resistance in the ET_0 calculates formula to set condition
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摘要 本文通过对我国半干旱区参考作物(修剪苜蓿)ET0值的率定实验研究,揭示了在ET0计算公式设定条件下冠层阻力rc的变化规律,认为:随着作物生育期的延长,冠层阻力呈现递增趋势,且生育中期实验条件及结果比较接近ICID和FAO建议ET0值的设定条件,期间冠层阻力变化幅度在86.9 s/m和66.3 s/m之间;冠层阻力的日变化过程呈现"U"形,最低点出现在中午,低于50s/m,最高点出现在早晨8∶00、20∶00,普遍高于100s/m;在冠层阻力PM、Todorovic计算公式中,共同影响rc的主要参数有:ra、es-ea、Rn、ET0,采用PM公式对这几项参数与rc-PM值进行多元回归分析,表明ET0对rc-PM值的影响最显著,其次是ra、Rn值,而es-ea对rc-PM值的影响不显著,本研究有助于参考作物rc数值的动态揭示和影响因子分析。 This paper studies through testing surely for the rate of our country that ET_0 of semi-arid climate reference crop(alfalfa),have revealed in ET_0 calculation formula set condition the change law of next crest layer resistance r_c,think: Along with crop give birth to issue prolong,crest layer resistance present to increase progressively tendency,and give birth to mid-term experiment condition and result more near ICID and FAO suggest ET_0 value set condition,in duration crest layer resistance change range i...
出处 《水利学报》 EI CSCD 北大核心 2007年第S1期269-275,共7页 Journal of Hydraulic Engineering
基金 教育部博士点学科专项科研基金项目(20050129006) 教育部西北农林科技大学旱区农业水土工程重点实验室科学基金联合资助
关键词 ET0计算公式 设定条件 冠层阻力 实验率定 研究 ET_0 calculates formula Set condition Surface resistance Test rate to decide Study
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共引文献25

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  • 1苏春宏,陈亚新,王亚东,徐冰.ET_0计算模型及其主要输入因子的影响分析评估[J].灌溉排水学报,2006,25(1):14-19. 被引量:15
  • 2苏春宏,陈亚新,张富仓,梁鸿.ET_0计算公式的设定条件和重要影响因子的实验率定研究[J].中国农村水利水电,2007(1):16-21. 被引量:12
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