皇甫川流域人工植被沙打旺水分状况研究

A Study on the Water Regime of Artificial Vegetation Astragalus adsurgens pall.cv. in Huangfuchuan Watershed

通过 1 998年 (丰年 )和 1 999年 (旱年 )连续两年对皇甫川流域人工植被——沙打旺 (As-tragalusadsurgens pall.cv.)蒸腾状况的定期野外测定 ,结果表明沙打旺蒸腾速率日变化曲线呈单峰型 ;其蒸腾速率季节动态 ,随土壤含水量和降水量的增减而波动 ,1 998年沙打旺平均蒸腾速率为 2 .1 1 4g水 /(g干重· h小时 ) ,而 1 999年为 1 .945 g水 /(g干重· h小时 ) ;

The water regime study of Astragalus adsurgens pall.cv. in Huangfuchuan watershed was conducted in growing season of 1998 (Abundant Precipitation) and 1999 (Deficit Precipitation).The results confirmed the following conclusion. The daily change of transpiration rate of A. adsurgens pall.cv. has one peak .The seasonal change of its transpiration rate increased with soil water content and precipitation increasing. The mean value of transpiration rate in 1998 and 1999 is 2.114 g /(g·h) and 1.945 g /(g·h)respectively. The aboveground biomass and water consumption of A.adsurgens pall.cv. has similar steps.