Isotopic analysis of water sources of mountainous plant uptake in a karst plateau of southwest China

	Isotopic analysis of water sources of mountainous plant uptake in a karst plateau of southwest China
	Li Rong; Xi Chen; Xunhong Chen; Shijie Wang; Xuelian Du
	2011
发表期刊	Hydrological Processes
卷号	25 期号:23 页码:3666-3675
摘要	Ecosystem in the karst region of southwest China is very fragile due to a very limited amount of water storage for plant uptake in the thin and rocky soils underlain by rock fractures. Plants in these karst regions are thought to take water from the soils and shallow fractured rock zone (subcutaneous zone) as well. However, the role of subcutaneous water in maintaining karst vegetation remains unclear, and proportions of the water sources for plant uptake in different environment conditions are unknown. In this study, five typical species of plants at two sites were selected in a karst plateau of Qingzhen, central Guizhou Province of China. Proportions of the possible water sources contributed for the plant uptake from two soil layers and subcutaneous zone were determined on the basis of delta D and delta(18)O values of plant stem water, soil water and subcutaneous water. The analysis reveals that most plants take water from the soil layers and the subcutaneous zone as well, but proportions of these water contributions for plant uptake vary seasonally and depend on site-specific conditions and plant species. Plant uptake of the subcutaneous water for all species averages less than 30% of the total monthly amount in June and September, compared with more than 60% in dry December. Plants tend to take a larger proportion of water from the upper soil layer at the bush site than at the forest site in June and September (63 vs 28% in July; 66 vs 54% in September for all species in average). In December, however, 98% of water is taken from the subcutaneous zone at the bush site which is much greater than 68% at the forest site. Compared to deciduous arbor, evergreen shrub takes a greater proportion of subcutaneous water in the December drought.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/4910
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Li Rong,Xi Chen,Xunhong Chen,et al. Isotopic analysis of water sources of mountainous plant uptake in a karst plateau of southwest China[J]. Hydrological Processes,2011,25(23):3666-3675.
APA	Li Rong,Xi Chen,Xunhong Chen,Shijie Wang,&Xuelian Du.(2011).Isotopic analysis of water sources of mountainous plant uptake in a karst plateau of southwest China.Hydrological Processes,25(23),3666-3675.
MLA	Li Rong,et al."Isotopic analysis of water sources of mountainous plant uptake in a karst plateau of southwest China".Hydrological Processes 25.23(2011):3666-3675.

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