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	Vertical patterns of soil water acquisition by non-native rubber trees (Hevea brasiliensis) in Xishuangbanna, southwest China
	Liu W. J. ; Li J. T. ; Lu H. J. ; Wang P. Y. ; Luo Q. P. ; Liu W. Y. ; Li H. M.
	2014
关键词	pronounced dry season rubber trees stable isotope water-use patterns tropical rain-forest stable-isotopes woody-plants dry-season drought systems climate alters catchment resources
英文摘要	The rubber tree (Hevea brasiliensis) has been extensively cultivated in Xishuangbanna, southwest (SW) China. It shows strong synchronicity for flushing and shedding, displaying a very different phenology to the native vegetation. However, little is known about the water-use patterns of the plant in this area. We assessed seasonal water-use strategies of rubber trees over the course of a rainy/dry season cycle. Stable isotope compositions of water in xylem, soil, rain and groundwater were sampled on seasonally distinct dates, and soil water content, root distribution and leaf water potential on sunny days were measured in order to determine the proportion of water derived from different soil layers. Midday leaf water potential of rubber trees was relatively stable throughout the year and did not drop significantly during the late dry season, displaying isohydric behaviour. Soil and stem water isotope signatures along with rooting distributional patterns revealed that rubber trees extracted their water mostly from the top 30 cm and less from below 70 cm of the soil profile during the late rainy season when soil water was plentiful. During the late dry season, as the moisture in the middle soil layers (30-70 cm) was gradually depleted, the depth of water uptake shifted to deeper soil levels. Model calculations showed that the proportion of water uptake from the shallow soil layer (<30 cm) increased markedly after the most recent rainfall in the late dry season and the early rainy season (varying between 65% and 71%), indicating significant plasticity in sources of water uptake in this dimorphic-rooted species. This ability to take up a large proportion of shallow soil water after rainfall is likely the key feature enabling rubber trees to thrive through the period of greatestwater demand. Our results suggest that rubber trees are able to adjust the allocation of resources and thus acclimate to the spatiotemporal changes to water conditions in the soil profile. Copyright (C) 2013 John Wiley & Sons, Ltd.
出处	Ecohydrology
卷	7
期	4
页	1234-1244
收录类别	SCI
语种	英语
ISSN号	1936-0584
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29718]
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	Liu W. J.,Li J. T.,Lu H. J.,et al. Vertical patterns of soil water acquisition by non-native rubber trees (Hevea brasiliensis) in Xishuangbanna, southwest China. 2014.

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