Leaf photosynthesis and simulated carbon budget of Gentiana straminea from a decade-long warming experiment

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	Leaf photosynthesis and simulated carbon budget of Gentiana straminea from a decade-long warming experiment
	Shen, Haihua 1; Klein, Julia A.2; Zhao, Xinquan 3; Tang, Yanhong 1
	2009-12-01
发表期刊	JOURNAL OF PLANT ECOLOGY
ISSN	1752-9921
卷号	2 期号:4 页码:207-216
文章类型	Article
摘要	Alpine ecosystems may experience larger temperature increases due to global warming as compared with lowland ecosystems. Information on physiological adjustment of alpine plants to temperature changes can provide insights into our understanding how these plants are responding to current and future warming. We tested the hypothesis that alpine plants would exhibit acclimation in photosynthesis and respiration under long-term elevated temperature, and the acclimation may relatively increase leaf carbon gain under warming conditions. Open-top chambers (OTCs) were set up for a period of 11 years to artificially increase the temperature in an alpine meadow ecosystem. We measured leaf photosynthesis and dark respiration under different light, temperature and ambient CO(2) concentrations for Gentiana straminea, a species widely distributed on the Tibetan Plateau. Maximum rates of the photosynthetic electron transport (J(max)), RuBP carboxylation (V(cmax)) and temperature sensitivity of respiration Q(10) were obtained from the measurements. We further estimated the leaf carbon budget of G. straminea using the physiological parameters and environmental variables obtained in the study. 1) The OTCs consistently elevated the daily mean air temperature by similar to 1.6 degrees C and soil temperature by similar to 0.5 degrees C during the growing season. 2) Despite the small difference in the temperature environment, there was strong tendency in the temperature acclimation of photosynthesis. The estimated temperature optimum of light-saturated photosynthetic CO(2) uptake (A(max)) shifted similar to 1 degrees C higher from the plants under the ambient regime to those under the OTCs warming regime, and the A(max) was significantly lower in the warming-acclimated leaves than the leaves outside the OTCs. 3) Temperature acclimation of respiration was large and significant: the dark respiration rates of leaves developed in the warming regime were significantly lower than leaves from the ambient environments. 4) The simulated net leaf carbon gain was significantly lower in the in situ leaves under the OTCs warming regime than under the ambient open regime. However, in comparison with the assumed non-acclimation leaves, the in situ warming-acclimated leaves exhibited significantly higher net leaf carbon gain. 5) The results suggest that there was a strong and significant temperature acclimation in physiology of G. straminea in response to long-term warming, and the physiological acclimation can reduce the decrease of leaf carbon gain, i.e. increase relatively leaf carbon gain under the warming condition in the alpine species.; Alpine ecosystems may experience larger temperature increases due to global warming as compared with lowland ecosystems. Information on physiological adjustment of alpine plants to temperature changes can provide insights into our understanding how these plants are responding to current and future warming. We tested the hypothesis that alpine plants would exhibit acclimation in photosynthesis and respiration under long-term elevated temperature, and the acclimation may relatively increase leaf carbon gain under warming conditions.
关键词	Alpine Plant Acclimation Experimental Warming Open-top Chamber Photosynthesis Temperature
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	RELATIVE GROWTH-RATE ; THERMAL-ACCLIMATION ; TIBETAN PLATEAU ; RESPIRATORY ACCLIMATION ; TEMPERATURE-ACCLIMATION ; DARK RESPIRATION ; ROOT RESPIRATION ; PLANTS ; MODEL ; PARAMETERS
收录类别	SCI
语种	英语
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
WOS类目	Plant Sciences ; Ecology
WOS记录号	WOS:000272465200005
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1800
专题	中国科学院西北高原生物研究所
作者单位	1.Natl Inst Environm Studies, Div Environm Biol, Tsukuba, Ibaraki 3058506, Japan 2.Colorado State Univ, Dept Forest Rangeland & Watershed Stewardship, Ft Collins, CO 80523 USA 3.Chinese Acad Sci, NW Plateau Inst Biol, Xining, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Shen, Haihua,Klein, Julia A.,Zhao, Xinquan,et al. Leaf photosynthesis and simulated carbon budget of Gentiana straminea from a decade-long warming experiment[J]. JOURNAL OF PLANT ECOLOGY,2009,2(4):207-216.
APA	Shen, Haihua,Klein, Julia A.,Zhao, Xinquan,&Tang, Yanhong.(2009).Leaf photosynthesis and simulated carbon budget of Gentiana straminea from a decade-long warming experiment.JOURNAL OF PLANT ECOLOGY,2(4),207-216.
MLA	Shen, Haihua,et al."Leaf photosynthesis and simulated carbon budget of Gentiana straminea from a decade-long warming experiment".JOURNAL OF PLANT ECOLOGY 2.4(2009):207-216.

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