【摘要】 植物群落生理生态用水包括生理用水和生态用水。认为植物蒸腾耗水既属于生理用水也属于生态用水,具有两重性。人工杨树林地主要建群树种的蒸腾速率日均值按大小顺序为:沙柳>小叶杨>中间锦鸡儿。林地生态用水包括林地群落蒸散量与土壤贮水量。2001年7～8月皇甫川人工杨树林地生态用水量达142mm,林地蒸散量为99mm,同期降雨量181mm,虽然有82mm的降水用于土壤水分补偿,但由于降雨集中于生长季后期,即较大降雨发生在野外观测之后,所以实验观测结果是一组难得的连年干旱期的生理生态用水数据。更多还原

【Abstract】 Physio-ecological use of water includes physiological use of water and ecological use of water. Transpiration water consumption not only belongs to physiological use of water, but also ecological use of water. Leaf water potential of C. intermedia showed high level all day, which didn’t benefit maintenance of leaf water. Transpiration rates of P. simonii, S. psammophyla, C. intermedia were in the following order: S. psammophyla>P. simonii>C. intermedia.Ecological use of water includes transpiration water consumption, inter-tree evapotranspiration (IET) and soil water storage of the community. Ecological use of water of the poplar forest land was (142) mm,in which ET was 99 mm, and rainfall was 181 mm at the same period, though there was 82 mm rainfall to compensate for soil water. But rainfall mainly focused on later growth time and was behind the observation, so the results of physio-ecological use of water in the paper are a rare group of data during dry period and very important for vegetation construction of the semi-arid region.更多还原