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	Are plants more responsive to decreased than to increased rainfall on the Tibetan Plateau? Evidence from Carex duriuscula subsp stenophylloides
	He Z. S. ; He W. M. ; Xu L. L. ; Shi P. L. ; Zhang X. Z. ; He Y. T. ; Zhong Z. M. ; Dong M.
	2006
关键词	biomass production Carex duriuscula subsp stenophylloides grassland ecosystems photosynthesis rainfall change carbon isotope discrimination gas-exchange water deficits drought stress leaves
英文摘要	Carex duriuscula subsp. stenophylloides is a sedge species in alpine grassland ecosystems on the Tibetan Plateau. Here we examine its physiological and growth responses to variation in simulated rainfall in a growing season. Compared with the present local rainfall, increased rainfall had no effect on any measured trait except for long-term water use efficiency, and decreased rainfall significantly reduced total leaf area and biomass production, while only severe limitation of rainfall decreased net photosynthetic rate, stomatal conductance, transpiration rate, and apparent carboxylation efficiency. Net photosynthetic rate was significantly correlated with stomatal conductance, transpiration rate, apparent carboxylation efficiency, and leaf water potential. Total plant dry weight was significantly correlated with net photosynthetic rate, total leaf area, and leaf area ratio. These findings suggest that stomatal limitation and degraded activity of mesophyll cells result in a decrease in net photosynthesis, and that decreased net photosynthesis and total leaf area lead to a decrease in plant production. Based on our measurements, sedge-dominated ecosystems of the Tibetan Plateau are more likely to be impacted by decreases in growing season rainfall than by increases.
出处	Annales Botanici Fennici
卷	43
期	6
页	401-408
收录类别	SCI
语种	英语
ISSN号	0003-3847
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23869]
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	He Z. S.,He W. M.,Xu L. L.,et al. Are plants more responsive to decreased than to increased rainfall on the Tibetan Plateau? Evidence from Carex duriuscula subsp stenophylloides. 2006.

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