Water Use Process of Salix psammophila and Salix cheilophila in Gonghe Basin, Qinghai Province
Water source of Salix psammophila and Salix cheilophila in Gonghe Basin was studied by stable hydrogen and oxygen isotope, and their long term water use efficiency was studied by stable carbon isotope.The results showed S.psammophila evenly used 10-150 cm soil water and ground water in spring, mainly used shallow soil water (10-25 cm) and ground water in summer, and mainly used deep soil water (50-150 cm) and ground water in autumn.Meanwhile, S.cheilophila mainly used shallow soil water (10-25 cm) and ground water in spring, evenly used 10-200 cm soil water and ground water in summer, and mainly used deep soil water (100-200 cm) in autumn.Therefore, S.psammophila and S.cheilophila selected different water source to use depend on their availability in different seasons.There was a competition for water between two Salix shrubs.Their long term water use efficiency indicated by leaf carbon isotope decreased in drought spring.The long term water use efficiency of S.psammophila indicated by leaf δ13C was higher than S.cheilophila in different season, which mean the former might have more adaptability in Gonghe Basin with semiarid climate.
Salix psammophilaSalix cheilophilawater sourceground waterwater use efficiency
NETL
NSTL
万方数据
维普
