globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13646
论文题名:
Changes in vegetation phenology are not reflected in atmospheric CO2 and 13C/12C seasonality
作者: Gonsamo A.; D'Odorico P.; Chen J.M.; Wu C.; Buchmann N.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:10
起始页码: 4029
结束页码: 4044
语种: 英语
英文关键词: Alert station ; carbon isotope ; climate change ; CO2 seasonality ; La Jolla station ; Mauna Loa Observatory ; phenology ; Point Barrow station ; soil respiration ; δ13C
英文摘要: Northern terrestrial ecosystems have shown global warming-induced advances in start, delays in end, and thus increased lengths of growing season and gross photosynthesis in recent decades. The tradeoffs between seasonal dynamics of two opposing fluxes, CO2 uptake through photosynthesis and release through respiration, determine the influence of the terrestrial ecosystem on the atmospheric CO2 and 13C/12C seasonality. Here, we use four CO2 observation stations in the Northern Hemisphere, namely Alert, La Jolla, Point Barrow, and Mauna Loa Observatory, to determine how changes in vegetation productivity and phenology, respiration, and air temperature affect both the atmospheric CO2 and 13C/12C seasonality. Since the 1960s, the only significant long-term trend of CO2 and 13C/12C seasonality was observed at the northern most station, Alert, where the spring CO2 drawdown dates advanced by 0.65 ± 0.55 days yr−1, contributing to a nonsignificant increase in length of the CO2 uptake period (0.74 ± 0.67 days yr−1). For Point Barrow station, vegetation phenology changes in well-watered ecosystems such as the Canadian and western Siberian wetlands contributed the most to 13C/12C seasonality while the CO2 seasonality was primarily linked to nontree vegetation. Our results indicate significant increase in the Northern Hemisphere soil respiration. This means, increased respiration of 13C depleted plant materials cancels out the 12C gain from enhanced vegetation activities during the start and end of growing season. These findings suggest therefore that parallel warming-induced increases both in photosynthesis and respiration contribute to the long-term stability of CO2 and 13C/12C seasonality under changing climate and vegetation activity. The summer photosynthesis and the soil respiration in the dormant seasons have become more vigorous which lead to increased peak-to-through CO2 amplitude. As the relative magnitude of the increased photosynthesis in summer months is more than the increased respiration in dormant months, we have the increased overall carbon uptake rates in the northern ecosystems. © 2017 John Wiley & Sons Ltd
资助项目: We thank the Scripps CO2 Programs, Climatic Research Unit, National Oceanic and Atmospheric Administration National Weather Service and National Climatic Data Center, SPOT VEGETATION Programme, and Compton J. Tucker and the Global Inventory Modeling and Mapping Studies team for making their data available. A.G. would like to thank the CAS President's International Fellowship Initiative Grant (No. 2015PE030). Two anonymous reviewers provided valuable comments which greatly improved the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60803
Appears in Collections:影响、适应和脆弱性

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作者单位: State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China; Department of Geography and Planning, University of Toronto, Toronto, ON, Canada; Institute of Agricultural Sciences, Swiss Federal Institute of Technology Zurich, Zurich, Switzerland

Recommended Citation:
Gonsamo A.,D'Odorico P.,Chen J.M.,et al. Changes in vegetation phenology are not reflected in atmospheric CO2 and 13C/12C seasonality[J]. Global Change Biology,2017-01-01,23(10)
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