QQ客服 官方微博 反馈留言

	Plant water sources in the cold semiarid ecosystem of the upper Kherlen River catchment in Mongolia: A stable isotope approach
	Li S. G. ; Romero-Saltos H. ; Tsujimura M. ; Sugimoto A. ; Sasaki L. ; Davaa G. ; Oyunbaatar D.
	2007
关键词	ecohydrology deuterium (D) oxygen-18 ((18)O) Larix sibirica water use Mongolia RAISE soil-water seasonal-variation hydrogen isotopes amazon basin precipitation forest resource savanna desert oxygen
英文摘要	In the cold semiarid region of northeastern Mongolia, we used stable isotopes (180 and D) to determine potential plant water sources during the 2003 growing season (June to September) in two habitats: montane forest and an elevation gradient from the forest to Kherten river bank. The forest is dominated by larch (Larix sibirica) with patches of cinquefoil shrubs (Potentilla fruticosa). The latter also grow throughout the elevation gradient, while the Larch grows only on the top slope. Poplar (Populus spp.) and willow (Salix spp.) trees grow only on the river bank. All plant and soil samples showed isotopic signatures similar to summer precipitation, which is isotopically heavier in summer than winter. In July and August, [arch trees in the forest tended to shift their water uptake to shallow depths in response to recent rainfall, but during the remaining months (June and September), depths of water uptake were unclear. Further, both the larch trees and cinquefoil shrubs in the forest used water at similar depths, suggesting potential competition for water. Plants along the elevation gradient showed different patterns of water use: (1) in July, larch used recent rainfall only, but in other months, the pattern was unclear; (2) cinquefoil depended on rainfall from recent weeks (as in August), but sometimes used antecedent rainwater from one month prior; and (3) poplar and willow seemed to use water from the river (as in August) or from precipitation that felt a few weeks prior (as in September), but the factors controlling this unusual shift are unknown. This study contributes to our understanding of plant water use strategies in cold semiarid ecosystems, and provides baseline data for models designed to understand large-scale hydrological effects of global climate change. (c) 2006 Elsevier B.V. All rights reserved.
出处	Journal of Hydrology
卷	333
期	1
页	109-117
收录类别	SCI
语种	英语
ISSN号	0022-1694
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23616]
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	Li S. G.,Romero-Saltos H.,Tsujimura M.,et al. Plant water sources in the cold semiarid ecosystem of the upper Kherlen River catchment in Mongolia: A stable isotope approach. 2007.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。