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基于雨养玉米农田生态系统2007年整个生长季的涡度相关通量资料,对蒸散的日、季动态进行分析.结果表明:玉米农田生态系统蒸散的日、季动态均呈单峰型变化,最大值分别出现在12:00左右和7月.结合修正的Penman-Monteith公式与相应的生态、气象观测要素,对作物系数(K指数)影响因子的分析结果表明,K指数主要受叶面积指数(LAI)、气温(Ta)、净辐射(Rn)以及表层土壤含水量的影响.在此基础上,初步建立了半小时尺度的作物系数(K指数)模型.
The daily and seasonal dynamics of evapotranspiration were analyzed based on the vorticity-related flux data of rainfed maize agro-ecosystem in the whole growing season in 2007. The results showed that the daily and seasonal dynamics of evapotranspiration of maize agroecosystem all showed a unimodal variation, The maximum values appeared around 12:00 and July respectively. Combined with the modified Penman-Monteith formula and corresponding ecological and meteorological factors, the analysis of the influence factors of crop coefficient (K-index) showed that K-index was mainly affected by leaf area index (LAI), temperature (Ta), net radiation (Rn) and soil moisture content of the topsoil. On this basis, a semi-hourly crop coefficient model was established.