【作者】 苏春宏； 陈亚新； 张富仓； 李志军；

【Author】 SU Chun-hong~(1,2) CHEN Ya-xin~1 ZHANG Fu-cang~3 LI Zhi-jun~3 (1.Institute of water conservancy and civil engineering of Inner Mongolia agriculture university Huhhot 010018; 2.Inner Mongolia autonomous region water resource and hydropower survey design institute Huhhot 010020; 3.Key Lab of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,Ministry of Education,Northwest Sci-Tech University of A& F,Yangling,Shaanxi 712100)

【机构】 内蒙古农业大学水资源与水工程研究所； 西北农林科技大学旱区农业水土工程教育部重点实验室；

【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 r_c 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86.9s/m 和66.3s/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 r_c 的主要参数有:r_a、e_s-e_a、R_n、ET₀,采用 PM 公式对这几项参数与 r_c-PM值进行多元回归分析,表明 ET₀对 r_c-PM值的影响最显著,其次是 r_a、R_n 值,而 e_s-e_a 对 r_c-PM值的影响不显著,本研究有助于参考作物 r_c 数值的动态揭示和影响因子分析。更多还原

【Abstract】 This paper studies through testing surely for the rate of our country that ETo of semi-arid climate reference crop（alfalfa）,have revealed in ET0 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 ET₀ value set condition,in duration crest layer resistance change range in 86.9 s/m and 66.3 s/m between;The day of surface resistance change course present the shape of "U ",minimum point appears in noon,is lower than 50 s/m,is highest to count appearance in morning 8: 00-20:00 is higher than 100 s/m generally;In surface resistance PM and Todorovic calculation formula in,the major parameter that affects r_c value together has:r_a e_s-e_a,R_R and ET₀,with PM formula for this some of parameter and r_c-PMvalue carry out multivariate regression analysis,Think that the influence of ETo to r_c-PMvalue is most notable of PM,secondly,it is ra and Rn value,and e_x-e_a for r_c-PMis not notable,it is revealed that this research is helpful to refer to the development of crop r_c value with the analysis of factor of influence.更多还原