北京师范大学学报（自然科学版）2016，Vol.52Issue(3)：271-276,6.DOI:10.16360/j.cnki.jbnuns.2016.03.004
黑河下游荒漠河岸林植物水分传输观测试验研究
Field experiment on water transport in desert riparian forests downstream of the Heihe River
摘要
Abstract
Desert riparian forests are the result of long-term adaptation to a particular environment in arid inland area,with special water use and survival strategies.In the this study the water potential,sap flow, hydraulic conductivity,hydraulic lift,and water use sources of Populus euphratica and Tamarixramosissima, major constructive species in the desert riparian forest in the lower Heihe River,were investigated.It was found that Populus euphratica and Tamarix ramosissima mainly used deep subsoil water and groundwater, mature Populus euphratica in the lower reaches of the Heihe River mainly absorbed soil water and groundwater at 175~325 cm for transpiration.The hydraulic lift of Populus euphratica roots mainly occurred at soil layer of 10~ 70 cm,where lift water accounts for 10% of water consumption.Initial and maximum hydraulic conductivity of roots and stems xylem of Populus euphratica and Tamarix ramosissima were high.Moreover, potential hydraulic conductivity of Tamarix ramosissima xylem was stronger than that of Populus euphratica xylem.Daily variation of the main trunk sap flow rate of Populus euphratica showed a unimodal distribution and reached its peak at 12:00 LT.There was no significant change in water potential of Populus euphratica at predawn,indicating that Populus euphratica and Tamarix ramosissima did not suffer serious water stress. Groundwater depth in lower reaches of the Heihe River was within 4 m,suitable for growth and development of desert riparian forest.关键词
荒漠河岸林/水分传输/水分来源/水力提升/内陆河Key words
desert riparian forests/water transport/plant water use sources/hydraulic lift/inland river分类
天文与地球科学引用本文复制引用
陈亚宁,李卫红,周洪华,陈亚鹏,郝兴明,付爱红,马建新..黑河下游荒漠河岸林植物水分传输观测试验研究[J].北京师范大学学报（自然科学版）,2016,52(3):271-276,6.基金项目
国家自然科学基金资助项目(91025025,41271006) （91025025,41271006）
