几种沙生植物水分生理生态特征的研究  

AN INVESTIGATION ON THE WATER PHYSIO-ECOLOGICAL CHARACTERISTICS OF SOME PSAMMOPHYTES

作　　者：董学军[1] 杨宝珍[1] 郭柯[1] 刘志茂 阿拉腾宝 韩松[1] 赵雨兴 

机构地区：[1]中国科学院植物所,内蒙古伊克昭盟林业治沙所

出　　处：《植物生态学报》1994年第1期86-94,共9页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金

摘　　要：本文研究了毛马素沙地一些沙生植物尤其是沙生灌木的蒸腾作用，并探讨了土壤－植物－大气体系水势梯度的变化，得出下列结论：１．根据植物蒸腾速率的日变化规律及叶子水分平衡的差异，将旱生植物水分生态类型分为１）非蒸腾午休型；２）轻蒸腾午休型；３）强蒸腾午休型。２．在分析了土壤－植物体系的水流控制后，认为干旱区灌木植物根系吸水能力对叶子气孔阻力变化的敏感程度与植物种群密度有密切关系。This paper concerns mainly the midday depression of transpiration and water potential gradiant of the soil-plant system of some mesophytes and xe-rophytes in ordos Sandland of China。The conclusions are given below:1. A new concept of dividing the ecological types in light of plant water relations is provided based on the midday depression of transpiration,and three types of typical features of different plant species are given:a. non midday depression type; b.weak midday depression type;c. strong midday depression type.2. By analyzing the water potential gradiant of the soil-plant system,we hypothesized that population density is affected by the sensitivity of soil wa- ter availability change to the change of leaf stomatal resistance.

关 键 词：水分亏缺 沙生植物 生理生态学 

分 类 号：Q948.112.3[生物学—植物学]