【摘要】 基于浑善达克沙地人工牧草灌溉试验场观测的气象、叶片的蒸腾速率、叶面积指数、有效根系层深度、土壤含水率、土壤蒸发等数据,利用双作物系数法模拟计算了2004、2005年老芒麦的日作物需水量,经与实测的作物蒸腾和土壤蒸发数据对比分析,检验了需水量模拟值与实测值间的一致性,在此基础之上,讨论了老芒麦需水量与产量、光合作用与蒸腾速率、光合作用与根系层土壤含水率的关系,结果表明:对老芒麦来说,从抑制无效蒸腾角度实现节水最直接的方法应该是有效根系层的土壤水分保持在田间持水率的51%~74%。更多还原

【Abstract】 Based on the observed datum in Otingag sandy area,including weather,leaf transpiration rate,leaf area index,effective rooting depth,soil moisture,soil evaporation and other data,the authors use dual crop coefficient method to simulate daily crop water requirements of Elymus in 2004 and 2005.The consistency of crop water requirements is tested by comparing the simulation values of crop transpiration and evaporation with the measured values.Based on it,the relationship between water requirements and yields,the relationship between photosynthesis and transpiration,the relationship between photosynthesis and root layer soil moisture content are discussed.The results show that the most direct way for saving-water from the aspect of restraining useless transpiration should be the soil moisture of effective root layer is maintained at field water-holding rate of 51% to 74% for Elymus.更多还原