Water Source of Salix Matsudana and Populus Simonii in Mu Us Sandy Land,China Based on Stable Oxygen Isotopes
It is of great significance to determine the water source of different vegetations in arid area and to grasp the utilization rate of potential water sources by vegetation under different water conditions for improving the utilization efficiency of water resources and more rational utilization of water resources in Mu Us sandy land.It is of great significance to understand the water sources of Salix matsudana(S.matsudana)and Populus simonii(P.simonii)in Mu Us sandy land for the efficient utilization of water resources.By analyzing the oxygen isotope composition of branch water,soil water and groundwater of S.matsudana and P.simonii,the Bayesian mixture(MixSIAR)model was used to quantify the water utilization rate of S.matsudana and P.simonii.The results show that the monthly soil water content and soil water δ18O values of S.matsudana and P.simonii increase first and then decrease with the increasing depth.In the growing season,S.matsudana and P.simonii adjust the utilization ratio of soil water and groundwater according to the environment change.When the rainfall is less,the utilization rate of soil water in each layer of S.matsudana and P.simonii is more balanced,and the utilization rate is 21.6％-28.2％and 22.6％-28.8％,respectively.When the rainfall is more,the main water source of S.matsudana and P.simonii is shallow soil water,and the utilization rate is up to 60.1％and 52.1％.It reflects the water adaptation of S.matsudana and P.simonii in Mu Us sandy land,determines the water use mode of artificial vegetation in arid area,and grasps the utilization rate of vegetation to potential water sources under different water conditions.It shows that in the future construction of artificial vegetation in Mu Us sandy land,water should be used to fix green,shrub and grass should be combined,and high water-consuming plant species such as trees should be selected as sand-fixing afforestation tree species as little as possible.
plant water useSalix matsudanaPopulus simoniistable isotopeMixSIAR modelwater absorption sourcegroundwaterMu Us sandy land
NETL
NSTL
万方数据
