globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13412
论文题名:
Carbon cycle responses of semi-arid ecosystems to positive asymmetry in rainfall
作者: Haverd V.; Ahlström A.; Smith B.; Canadell J.G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:2
起始页码: 793
结束页码: 800
语种: 英语
英文关键词: Australia ; global carbon cycle ; greening trend ; rainfall asymmetry ; semi-arid ecosystems
英文摘要: Recent evidence shows that warm semi-arid ecosystems are playing a disproportionate role in the interannual variability and greening trend of the global carbon cycle given their mean lower productivity when compared with other biomes (Ahlström et al. 2015 Science, 348, 895). Using multiple observations (land-atmosphere fluxes, biomass, streamflow and remotely sensed vegetation cover) and two state-of-the-art biospheric models, we show that climate variability and extremes lead to positive or negative responses in the biosphere, depending on vegetation type. We find Australia to be a global hot spot for variability, with semi-arid ecosystems in that country exhibiting increased carbon uptake due to both asymmetry in the interannual distribution of rainfall (extrinsic forcing), and asymmetry in the response of gross primary production (GPP) to rainfall change (intrinsic response). The latter is attributable to the pulse-response behaviour of the drought-adapted biota of these systems, a response that is estimated to be as much as half of that from the CO2 fertilization effect during 1990–2013. Mesic ecosystems, lacking drought-adapted species, did not show an intrinsic asymmetric response. Our findings suggest that a future more variable climate will induce large but contrasting ecosystem responses, differing among biomes globally, independent of changes in mean precipitation alone. The most significant changes are occurring in the extensive arid and semi-arid regions, and we suggest that the reported increased carbon uptake in response to asymmetric responses might be contributing to the observed greening trends there. © 2016 John Wiley & Sons Ltd
资助项目: VH and JGC thank the support of the Australian Climate Change Science Program. AA acknowledges support from The Royal Physiographic Society in Lund (Birgit and Hellmuth Hertz Foundation) and the Swedish Research Council (grant no: 637-2014-6895). BS acknowledges funding as an OCE Distinguished Visiting Scientist to CSIRO Oceans and Atmosphere, Canberra. This study is a contribution to the strategic research areas BECC and MERGE.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61072
Appears in Collections:影响、适应和脆弱性

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作者单位: CSIRO Oceans and Atmosphere, GPO Box 3023, Canberra, ACT, Australia; Department of Earth System Science, School of Earth, Energy and Environmental Sciences, Stanford University, Stanford, CA, United States; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden

Recommended Citation:
Haverd V.,Ahlström A.,Smith B.,et al. Carbon cycle responses of semi-arid ecosystems to positive asymmetry in rainfall[J]. Global Change Biology,2017-01-01,23(2)
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