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	Water sources of dominant species in three alpine ecosystems on the Tibetan Plateau, China
	Duan D. Y. ; Ouyang H. ; Song M. H. ; Hu Q. W.
	2008
关键词	delta D delta(18)O precipitation river water soil water Tibetan Plateau summer precipitation trees plants perspectives vegetation responses shrubs
英文摘要	Plant water sources were estimated by two or three compartment linear mixing models using hydrogen and oxygen isotope (delta D and delta(18)O) values of different components such as plant xylem water, precipitation and river water as well as soil water on the Tibetan Plateau in the summer of 2005. Four dominant species (Quercus aquifolioides, Pinus tabulaeformis, Salix rehderiana and Nitraria tangutorum) in three typical ecosystems (forest, shrub and desert) were investigated in this study. Stable isotope ratios of the summer precipitations and the soil water presented variations in spatial and temporal scales. delta(18)O values of N. tangutorum xylem water were constant in the whole growth season and very similar to those of deep soil water. Water sources for all of the plants came from both precipitations and soil water. Plants switched rapidly among different water sources when environmental water conditions changed. Rainwater had different contributions to the plants, which was influenced by amounts of precipitation. The percentage of plant xylem water derived from rainwater rose with an increase in precipitation. Water sources for broad-leaved and coniferous species were different although they grew in the same environmental conditions. For example, the broad-leaved species Q. aquifolioides used mainly the water from deep soil, while 92.5% of xylem water of the coniferous species P. tabulaeformis was derived from rainwater during the growth season. The study will be helpful for us to fully understand responses of species on the Tibetan Plateau to changes in precipitation patterns, and to assess accurately changes of vegetation distribution in the future.
出处	Journal of Integrative Plant Biology
卷	50
期	3
页	257-264
收录类别	SCI
语种	英语
ISSN号	1672-9072
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24097]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Duan D. Y.,Ouyang H.,Song M. H.,et al. Water sources of dominant species in three alpine ecosystems on the Tibetan Plateau, China. 2008.

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