【摘要】 本文采用FAO-56推荐的计算牧草需水量的双作物系数法,应用内蒙古正蓝旗的人工草地试验资料,模拟计算无水分胁迫条件下的人工牧草的需水量(蒸散发)的基础上,分析模拟计算值与Li6400光合作用仪以及微型土壤蒸发器的实测值之间存在的误差,用迭代反推法确定了人工牧草———披碱草生长阶段基本作物系数地区值(Kcb地)为0.203、0.691、0.461。用Kcb地模拟计算了有水分胁迫的披碱草需水量,并用实测值对迭代法确定的Kcb地合理性进行了验证,验证结果表明合理,可用做地区参数来模拟计算人工牧草需水量。更多还原

【Abstract】 Based on the field experimental data from Zhenglan banner of inner Mongoliaunder non-water stress condition water requirements(ET) of grass was simulated using dual crop coefficient approachpresented in FAO-56.The regional basal coefficients of Elymus excelsus Trucz.ingrowing season was determined by iteration method as 0.203、0.691 and 0.461 after comparing the results between water requirementsfrom simulation and from measurement with LI 6400 Portable Photosynthesis System and Micro-lysimeters.The water requirementsfor the Elymus excelsus Trucz.under water stress conditions was simulated using the basal coefficients.The comparison results betweenestimated value of water requirement under water stress condition and measured data tell us the accuracy of the basal grass coefficients are OK and can be used as regional standard parameters.更多还原