Water Use Strategies of Populus euphratica and Tamarix ramosissima at Different Ages in Tarim River Basin
Based on the stable isotope method,The water use patterns and strategies of Populus euphratica and Tamarix ramosissima at different ages were studied in Tarim River Basin.The results showed that:(1)precipitation offset of plant and soil water were significantly different from that of groundwater,indicating that there were two inhomogeneous and incompletely mixed water reservoirs that supply either for the plant water fluxes or the fluxes of groundwater.(2) The δ18O value of surface soil water fluctuated widely,which was affected by evaporation,and the δ18O value of soil water decreased gradually with the increasing soil depth.(3) The water used by the Populus euphratica and Tamarix ramosissima with different ages came from different sources.The deeper soil water could be accessed after the ages increased.There might be water competition at the mature age of Populus euphratica and seedling age of Tamarix ramosissima.Whether seedling or mature,Tamarix ramosissima could use deeper water than Populus euphratica,and therefore,be more adaptable to the arid environment.
Populus euphraticaTamarix ramosissimadifferent ages of vegetationwater use strategiesstable isotope
国家科技期刊平台
NSTL
万方数据
维普
