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- Many kinds of approaches have been used for estimating crop evapotranspiration,here,we use crop coefficient approach recommended by FAO. 估算作物腾发速率的方法很多,本研究采用了联合国粮农组织推荐的作物系数法。
- Modified Penman and Penman Monteith formulae were recommended to calculate the reference crop evapotranspiration by FAO one after another. FAO先后建议用Penman修正式和Penman Monteith公式计算参考作物蒸散量 .
- The results show that precipitation, irrigation, crop evapotranspiration and soil evaporation are the main factors that affect soil moisture regime. 结果表明:大气降水、农田灌溉、作物蒸腾和田间土壤蒸发是影响土壤水分变化的主要因素。
- Reference crop evapotranspiration(ET_0) estimates on the basis of FAO recommended methodology require some meteorological data; however another approach,i. e. 根据联合国粮农组织推荐的方法估算参考作物蒸发蒸腾量(ET0)需要具备一定的气象资料,而使用另一种方法,即蒸发计估测ET0,可以减少基于作物蒸发蒸腾量制定灌溉制度的工作量,并且降低其复杂度。
- The reference crop evapotranspiration in Hunpu irrigation district,Liaoning province was calculated with the equation of Penman-Monteith recommended by FAO. 采用联合国粮农组织最新推荐的Penman-Monteith公式,分析了浑蒲灌区参考作物需水量。
- The crop coefficients (Kc) of winter wheat were obtained, based on the measured ETc by TDR in the field and calculated reference crop evapotranspiration (ETo) with meteorological data. 根据冬小麦生育期内实测的ETc以及用气象资料计算的参考作物蒸散量(ETo),求得了冬小麦的作物系数(Kc)。
- The ratio between soil evaporation and crop evapotranspiration in each month and in the whole growing period of winter wheat are obtained from observed evolution of soil evaporation rate in the field. 在农田水量平衡的各种计算模型中,总是用参照腾发量与作物系数的乘积计算作物总腾发量,而如何将土面蒸发与叶面蒸腾分开,一直是困扰着人们的难题。
- Several methods and models for the real-time forecast of the reference crop evapotranspiration were discussed.The opinion of optimization between different models was proposed during application. 评述了参考作物蒸发蒸腾量实时预报的几种方法,指出了在具体应用时宜结合实际情况进行模型的优化择选以提高预测精度。
- Isoline map of crop evapotranspiration 作物需水量等值线图
- reference crop evapotranspiration 参考作物蒸发蒸腾量
- reference crop evapotranspiration (ET0) 参考作物蒸发蒸腾量(ET0)
- Duo to crops' physiological mechanism and the unsteady,non-linear stochastic variation of meteorological factors,reference crop evapotranspiration time series is characterized by its periodicity. 受作物本身生理机制以及近地层气象因子非线性、非平稳化随机变化的影响,参考作物潜在腾发量时序过程具有周期特性。
- Rice is the chief crop in most southern provinces. 稻子是大多数南方省份的主要作物。
- The grain crop has gone down this year. 今年的粮食作物产量下降了。
- reference crops evapotranspiration quantity 参照作物腾发量
- We have had the biggest wheat crop ever this year. 今年我们的小麦收获量是有史以来最好的。
- Half the fruit crop froze out in the sudden cold. 一半的水果作物在突如其来的寒流中被冻死。
- Rice is the chief crop in this ares. 稻子是这一地区的主要作物。
- We had a poor crop of raspberries this year. 今年我们的悬钩子歉收。
- The farmer paid 3 laborers to gather the crop. 农场主雇佣3名工人收割庄稼。