Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13412 |
Carbon cycle responses of semi-arid ecosystems to positive asymmetry in rainfall | |
Haverd, Vanessa1; Ahlstrom, Anders2,3; Smith, Benjamin3; Canadell, Josep G.1 | |
2017-02-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA; Sweden |
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 (Ahlstrom etal. 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. |
英文关键词 | Australia global carbon cycle greening trend rainfall asymmetry semi-arid ecosystems |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394343300029 |
WOS关键词 | TERRESTRIAL CARBON ; CLIMATE VARIABILITY ; INTERANNUAL VARIABILITY ; VEGETATION DYNAMICS ; WATER ; MODEL ; PRECIPITATION ; PHENOLOGY ; PATTERNS ; FRACTION |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17789 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.CSIRO Oceans & Atmosphere, GPO Box 3023, Canberra, ACT 2601, Australia; 2.Stanford Univ, Sch Earth Energy & Environm Sci, Dept Earth Syst Sci, Stanford, CA 94305 USA; 3.Lund Univ, Dept Phys Geog & Ecosyst Sci, S-22362 Lund, Sweden |
推荐引用方式 GB/T 7714 | Haverd, Vanessa,Ahlstrom, Anders,Smith, Benjamin,et al. Carbon cycle responses of semi-arid ecosystems to positive asymmetry in rainfall[J]. GLOBAL CHANGE BIOLOGY,2017,23(2). |
APA | Haverd, Vanessa,Ahlstrom, Anders,Smith, Benjamin,&Canadell, Josep G..(2017).Carbon cycle responses of semi-arid ecosystems to positive asymmetry in rainfall.GLOBAL CHANGE BIOLOGY,23(2). |
MLA | Haverd, Vanessa,et al."Carbon cycle responses of semi-arid ecosystems to positive asymmetry in rainfall".GLOBAL CHANGE BIOLOGY 23.2(2017). |
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