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中文摘要：
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.
英文摘要：
Based on the eddy covariance flux data, meteorological gradient data, and ecological observation data, an analysis was made on the diurnal and seasonal dynamics of evapotranspiration from a rain-fed maize agroecosystem in the growth season of 2007. The diurnal and seasonal dynamics of the evapotranspiration could be both expressed as parabola curve, with the peak values appeared at about 12：00 and July, respectively. The crop coefficient of the agroecosystem was mainly affected by leaf area index （LAI）, air temperature, net radiation, and surface soil moisture content. A statistical model of crop coefficient on half-hour scale was constructed.
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