多年生人工牧草“老芒麦”根系层土壤含水率对节水的影响研究  

Study on Influence of Root Layer Soil Moisture Content on Water-saving of Perennial Tame Pasture of Elymus

作　　者：于婵[1,2] 高瑞忠[1] 朝伦巴根[1] 朱仲元[1] 李和平 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018 [2]内蒙古自治区水文总局,内蒙古呼和浩特010010 [3]中国水科院牧区水利科学研究所,内蒙古呼和浩特010010

出　　处：《节水灌溉》2010年第8期18-22,26,共6页Water Saving Irrigation

基　　金：国家自然科学基金重点资助项目(50139040);水利部公益性行业科研专项经费项目(200801034)

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％。Based on the ohserved 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 wa- ter requirements of Elymus in 2004 and 2005. The consistency of crop water requirements is tested by comparing the simulation val- ues 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 mois- ture content are discussed. The results show that the most direct way for saving-water from the aspect of restraining useless transpi- ration should be the soil moisture of effective root layer is maintained at field water-holding rate of 51% to 74 % for Elymus.

关 键 词：人工牧草 灌溉试验 双作物系数法 光饱和点 根系层土壤含水率 

分 类 号：S274.1[农业科学—农业水土工程]