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Effect of open-field experimental warming on the leaf phenology of oriental oak (Quercus variabilis) seedlings

Journal of Plant Ecology 2014年第6期7卷 559-566页

作者： Saerom Han Haegeun Chung Nam Jin Noh Sun Jeoung Lee Wooyong Jo Tae Kyung Yoon Koong Yi Chan-woo Park Suin Ko Yowhan Son Department of Environmental Science and Ecological Engineering Graduate SchoolKorea UniversitySeoul 136-713Korea Department of Environmental Engineering Konkuk UniversitySeoul 143-701Korea River Basin Research Center Gifu UniversityGifu 501-1193Japan Forest and Climate Change Center Korea Forest Research InstituteSeoul 130-712Korea Hanlim Patent and Law Office Seoul 152-050Korea Forest Soil and Water Conservation Division Korea Forest Research InstituteSeoul 130-712Korea Environmental Policy Research Group Korea Environment InstituteSeoul 122-706Korea

Aims An open-field warming experiment enables us to test the effects of projected temperature increase on change in plant phenology with fewer confounding factors and to study phenological response to temperature ranges beyond natural *** study aims to(i)examine the effect of temperature increase on leaf unfold-ing and senescence of oriental oak(Quercus variabilis Blume)under experimental warming and(ii)measure temperature-related parameters used in estimating phenological response to tempera-ture *** Using an open-field warming system with infrared heaters,we increased the air temperature by~3℃ in the warmed plots compared with that of the control plots consistently for 2 *** unfolding and senescence dates of *** seedlings were recorded and temperature-related phenological parameters were *** Findings The timing of leaf unfolding was advanced by 3-8 days(1.1-3.0 days/℃)and the date of leaf senescence was delayed by 14-19 days(5.0-7.3 days/℃)under elevated air ***,the cumulative degree days(CDD)of leaf unfolding were not significantly changed by experimental warming,which suggest the applicability of a constant CDD value to estimate the change in spring leaf phe-nology under 3℃ *** ranges of advancement and temperature sensitivity in spring phenology and delayed autumn phe-nology and proposed temperature parameters from this study might be applied to predict future phenological change.

关键词： climate change cumulative degree days experimental warming leaf senescence leaf unfolding

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Influence of short-term experimental warming on heat-waterprocesses of the active layer in a swamp meadow ecosystemof the Qinghai-Tibet Plateau

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Research in Cold and Arid Regions 2016年第2期8卷 125-134页

作者： GuangSheng Liu GenXu Wang College of Environmental Science and Engineering Xiamen University of TechnologyXiamenFujian 361024China Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduSichuan 610041China

Climate change is now evident in the Qinghai-Tibet Plateau(QTP), with impacts on the alpine ecosystem, particularly on water and heat balance between the active layer and the atmosphere. Thus, we document the basic characteristics of changes in the water and heat dynamics in response to experimental warming in a typical alpine swamp meadow ecosystem. Data sets under open top chambers(OTC) and the control manipulations were collected over a complete year. The results show that annual(2008) air temperatures of OTC-1 and OTC-2 were 6.7 °C and 3.5 °C warmer than the control. Rising temperature promotes plant growth and development. The freeze-thaw and isothermal days of OTCs appeared more frequently than the control, owing to comparably higher water and better vegetation conditions. OTCs soil moisture decreased with the decrease of soil depth; however, there was an obviously middle dry aquifer of the control, which is familiar in QTP. Moreover, experimental warming led to an increase in topsoil water content due to poorly drained swamp meadow ecosystem with higher organic matter content and thicker root horizons. The results of this study will have some contributions to alpine cold ecosystem water-heat process and water cycle under climate change.

关键词： experimental warming open top chamber Qinghai-Tibet Plateau soil moisture soil temperature alpine swamp meadow ecosystem

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

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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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warming Changed Soil Respiration Dynamics of Alpine Meadow Ecosystem on the Tibetan Plateau

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Journal of Environmental & Earth Sciences 2019年第2期1卷 7-17页

作者： Junfeng Wang Ziqiang Yuan Qingbai Wu Rashad Rafique School of Environmental Science and Technology Shanxi University of Science&TechnologyXi’anShanxi710021China State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouGansu730000China Joint Global Change Research Institute Pacific Northwest National LabCollege ParkMD 20740USA Department of Microbiology and Plant Biology University of OklahomaNormanOK 73019USA Beiluhe Observation Station of Frozen Soil Environment and Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouGansu730000China

Alpine meadow system underlain by permafrost on the Tibetan Plateau contains vast soil organic carbon and is sensitive to global ***,the dynamics of annual soil respiration(Rs)under long-term warming and the determined factors are still not very *** opentop chambers(OTC),we assessed the effects of two-year experimental warming on the soil CO2 emission and the Q10 value(temperature sensitivity coefficient)under different warming *** study showed that the soil CO2 efflux rate in the warmed plots were 1.22 and 2.32 times higher compared to that of controlled ***,the Q10 value decreased by 45.06%and 50.34%respectively as the warming magnitude *** results suggested that soil moisture decreasing under global warming would enhance soil CO2 emission and lower the temperature sensitivity of soil respiration rate of the alpine meadow ecosystem in the permafrost region on the Tibetan ***,it is necessary to take into account the combined effect of ground surface warming and soil moisture decrease on the Rs in order to comprehensively evaluate the carbon emissions of the alpine meadow ecosystem,especially in short and medium terms.

关键词： Soil respiration Alpine meadow experimental warming Open-top chamber

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