库布齐沙漠几种旱生灌木耗水特性研究  

Water consumption characteristics of several shrubs in Kubuqi desert

作　　者：王晓江[1,2] 贺康宁[1] 唐道峰[1] 

机构地区：[1]北京林业大学水土保持学院,北京100086 [2]内蒙古林业科学研究院,呼和浩特010010

出　　处：《干旱区资源与环境》2010年第10期116-121,共6页Journal of Arid Land Resources and Environment

基　　金：国家科技支撑计划项目(2006BAC01A12)资助

摘　　要：从土壤-植物-大气连续体(SPAC)理论角度出发,利用整树容器实测法和彭曼联合(Penman-Monteith)估算法的互证研究方法,对库布齐沙地主要造林树种沙柳、沙枣、小叶锦鸡儿和四翅滨藜的蒸腾耗水特性及其主要影响因子进行了研究。结果表明:1)稳态气孔计测定值始终大于整株称重测定值。随着苗木土壤含水量的提高,两种方法测定值均上升,说明土壤水分对两种方法的测定值有一定影响。2)从Penman-Monteith修正方程模拟结果可以看出,准确的测算消光系数与叶面积指数是提高准确性的关键。3)四种灌木年蒸腾量大小排列顺序为:沙柳﹥沙枣﹥小叶锦鸡儿﹥四翅滨藜。不同林分的月蒸腾量差异较大,6～8月月蒸腾总量可达生长季蒸腾量的70%～80%。沙柳、沙枣和四翅滨藜林分月蒸腾量最大值分别出现在7月、小叶锦鸡儿则出现在6月。Based on the soil-plant-atmosphere continuum（SPAC） theories,by making use of the whole tree container actual measurement and Penman-Monteith estimation,we researched the transpiration characteristics and affecting factors for Salix Psammophila,Elaeagnus angustifolia,Caragana microphylla Lam and Atripldex canescens,which are main forestation species in Kubuqi desert.The results show as follows：1.The value of steady pore measurement is always more than value of weighing whole tree measurement.Two kinds of measurement values all rise when the soil water increases.The phenomenon explains that the soil mosture influences the two measurement methods.2.Form the simulative result of Penman-Monteith amendatory equation,we can find out that accurately measuring the eliminate light coefficient and leaf area index is the key for enhancing precision.3.The sequence of four shrub＇s transpiration value is that Salix Psammophila 〉Elaeagnus angustifolia 〉Caragana microphylla Lam〉 Atripldex canescens.The monthly transpiration is discrepant between different woods.The transpiration amount from June to August can take 70 ～ 80% of the whole growth season.The max transpiration amounts of Salix Psammophila,Elaeagnus angustifolia and Atripldex canescens appear in July.The max transpiration amount of Caragana microphylla Lam appears in June.

关 键 词：旱生灌木 林木蒸腾量 库布齐 

分 类 号：Q945.17[生物学—植物学]