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The tree specie selection is the critical part in the process of vegetation restoration and reconstruction in arid and semi-arid areas.As a reliable indicator of drought resistance and water use characteristics of tree species,water use efficiency(WUE) has become a hotspot in the research on tree specie selection.This paper introduced the concept and correspondingly research method of leaf WUE and summarized the research progress of leaf WUE in terms of the variation in leaf WUE between species,positions in the canopy,and characteristics of temporal and spatial variation,its influence on environmental factors like illumination,moisture,temperature, CO_2 and O_3 concentrations.Furthermore,it put forward the problems currently existing in the research and prospected the trend of future research on leaf WUE.
The tree specie selection is the critical part in the process of vegetation restoration and reconstruction in arid and semi-arid areas. As a reliable indicator of drought resistance and water use characteristics of tree species, water use efficiency (WUE) has become a hotspot in the research on tree specie selection.This paper introduced the concept and correspondingly research method of leaf WUE and summarized the research progress of leaf WUE in terms of the variation in leaf WUE between species, positions in the canopy, and characteristics of temporal and spatial variation , its influence on environmental factors like illumination, moisture, temperature, CO 2 and O 3 concentrations. Future, it put forward the problems currently existing in the research and prospected the trend of future research on leaf WUE.