Variation in water source of sand-binding vegetation across a chronosequence of artificial desert revegetation in Northwest China  

作　　者：YanXia Pan XinPing Wang Rui Hu YaFeng Zhang Yang Zhao 

机构地区：[1]Shapotou Desert Research and Experiment Station,Northwest Institute of Eco-environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China

出　　处：《Research in Cold and Arid Regions》2020年第5期306-316,共11页寒旱区科学（英文版）

基　　金：the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA23060202);the Chinese National Natural Sciences Foundation(Grant Nos.41530750,41771101).

摘　　要：Water is the most important limiting factor in arid areas,and thus water resource management is critical for the health of dryland ecosystems.However,global climate change and anthropogenic activity make water resource management more difficult,and this situation may be particularly crucial for dryland restoration,because of variation in water uptake patterns associated with artificial revegetation of different ages and vegetation type.However,there is lacking longterm restorations that are suitable for studying this issue.In Shapotou area,Northwest China,artificial revegetation areas were planted several times beginning in 1956,and now form a chronosequence of sand-binding landscapes that are ideal for studying variability in water uptake source by plants over succession.The stable isotopesδ18O andδ2H were employed to investigate the water uptake patterns of the typical revegetation shrubs Artemisia ordosica and Caragana korshinskii,which were planted in different years.We compared the stable isotope ratios of shrub stem water to groundwater,precipitation,and soil water pools at five layers(5−10,10−40,40−80,80−150,and 150−300 cm).The results indicate that Artemisia ordosica derived the majority of their water from the 20−150 cm soil layer,whereas Caragana korshinskii obtained water from the 40−150 cm soil layer.The main water sources of Artemisia ordosica and C.korshinskii plants changed over time,from deeper about 150 cm depth to shallow 20 cm soil layer.This study can provide insights into water uptake patterns of major desert vegetation and thus water management of artificial ecosystems,at least in Northwest China.

关 键 词：artificial vegetation stable isotopes soil water xylem water water source 

分 类 号：X143[环境科学与工程—环境科学] TV213.4[水利工程—水文学及水资源]