【摘要】 通过综合考虑影响作物蒸散量的土壤、作物、大气3方面因子,结合新疆滴灌棉田覆膜栽培的生产实际,设计了不同覆盖度和品种试验,以Penman-Montieth方程估算参考作物蒸散量,确定了不同覆盖度及品种条件下的作物系数,并在此基础上实现了覆膜滴灌棉田蒸散量较为准确地估计。试验结果认为覆膜滴灌棉田全生育期蒸散量在540～620mm之间,全生育期蒸散量和作物系数都随着覆盖度的增加而减小,叶面积指数与日蒸散量及作物系数关系密切,品种间由于品种特性的差异而引起的叶面积指数变化,最终导致了品种间作物系数Kc的不同。更多还原

【Abstract】 <Abstrcat> Three crop evapotranspiration affecting factors of soil,crop and atmosphere were calculated synthetically, combining with the actual situation of drip-irrigated cotton field with plastic film mulching in Xinjiang Region, the experiment with different film mulching degrees and cotton varieties was designed, the reference evapotranspiration was estimated by the model of Penman-Montieth, then the crop coefficients of different film mulching degrees and varieties were determined. Moreover, the goal of caculating evapotranspiration of drip irrigation with plastic film mulching in cotton field precisely based on it was reached. The results of experiment show that the whole growing period’s evapotranspirations of drip-irrigated cotton field with plastic film mulching range from 540 mm to 620 mm, the evapotranspiration and crop coefficient are reduced with the increasing of film mulching degree, there are close correlations among leaf area index, daily evapotranspiration and crop coefficient,the changes of variety characteristics between different varieties lead to the distinctness of different crop coefficients.更多还原