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本文结合塔里木河下游地区地下水位埋深的变化,运用先进仪器,对不同监测断面的胡杨液流变化特征进行了测定,结果表明:塔里木河下游地区胡杨液流日变化表现出单峰值和双峰值两种形式,且有明显的昼夜节律变化;胡杨液流在树干2个方位上,东南面液流速率高于西北面,且液流速率随木质部深度的增加而减小;具有较大直径的胡杨,其液流速率、耗水量相对较大;空气湿度、太阳辐射和大气温度是影响塔里木河下游地区胡杨蒸腾耗水量变化的主要环境因子;塔里木河下游地区高温干旱的环境特征,以及生态输水提供的较为充分的水分来源,决定了该区胡杨日水耗量较其他地区胡杨大,2005年2次生态输水后,河岸两侧地下水位明显抬升,胡杨液流和水势作为两项生理指标都对地下水位变化灵敏响应。
Based on the changes of groundwater table buried depth in the lower reaches of the Tarim River, the characteristics of Populus euphratica flow at different monitoring sections were measured using advanced instruments. The results show that the diurnal changes of Populus euphratica flow in the lower reaches of the Tarim River show single peak and double peak There were obvious changes of circadian rhythms in Populus euphratica, Populus euphratica and Populus euphratica at two orientations of the tree trunk. The flow velocity in the southeast was higher than that in the northwest and the flow rate decreased with the depth of the xylem. Populus euphratica, its flow rate and water consumption are relatively large; air humidity, solar radiation and atmospheric temperature are the main environmental factors that affect the transpiration of Populus euphratica in the lower reaches of the Tarim River; environmental characteristics of high temperature and drought in the lower reaches of the Tarim River, Water provides a more adequate source of water, determines the area Populus euphratica daily water consumption than Populus euphratica in other areas, ecological water in 2005 2, river water level on both sides of the ground significantly elevated, Populus flow and water potential as two physiological Indicators are sensitive to changes in groundwater level.