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

Journal of Plant Ecology 2009年第4期2卷 207-216页

作者： Haihua Shen julia aklein Xinquan Zhao Yanhong Tang Environmental Biology Division National Institute for Environmental StudiesOnogawa 16-2TsukubaIbaraki305-8506Japan Department of Forest Rangeland&Watershed StewardshipColorado State UniversityFort CollinsCO 80523USA Northwest Plateau Institute of Biology Chinese Academy of SciencesXiningQinghaiChina

Aims Alpine ecosystems may experience larger temperature increases due to global warming as compared with lowland *** on physiological adjustment of alpine plants to temperature changes can provide insights into our understanding how these plants are responding to current and future *** 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 *** Open-top chambers(OTCs)were set up for a period of 11 years to artificially increase the temperature in an alpine meadow *** 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 *** rates of the photosynthetic electron transport(J_(max)),RuBP carboxylation(V_(cmax))and temperature sensitivity of respiration Q10 were obtained from the *** further estimated the leaf carbon budget of *** using the physiological parameters and environmental variables obtained in the *** findings 1)The OTCs consistently elevated the daily mean air temperature by;1.6℃and soil temperature by;0.5℃during the growing season.2)Despite the small difference in the temperature environment,there was strong tendency in the temperature acclimation of *** estimated temperature optimum of light-saturated photosynthetic CO_(2)uptake(A_(max))shifted;1℃higher from the plants under the ambient regime to those under the OTCs warming regime,and the Amax 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

关键词： alpine plant acclimation experimental warming open-top chamber photosynthesis temperature

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