Water Balance Characteristics of Some Grass Communities in Songnen Grassland

Wang Renzhong (National Laboratory of Grassland Ecological Engineering, Northeast Normal University, Changchun 130024)  

The ecological characteristics of water balance in plants were studied on Songnen grassland for four major grass communities, these were Leymus chinensis, Puccinellia tenuiflora, Puccinellia chinampoensis and Chloris virgata. A set of self-made lysimeters and a Campbell CR10 datalogger were employed in the study. The results showed that the diurnal variation in plant transpiration rate was characterised by a curve with twin peaks for all the four grass communities, but it varied significantly among them and between different months. The most significant factor influencing the rate of transpiration was, among many others, solar radiation. All the three communities other than Chloris virgata suffered a serious water deficit in the growing season, with the most serious for Leymus chinensis. It is needed in planning a large-area plantation of these species to consider water deficit an important limiting factor.

【Key Words】： Grass communities water ecology Songnen grassland
【Fund】： 国家自然科学基金
【CateGory Index】： S812.3

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