Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14620 |
Aquatic carbon fluxes dampen the overall variation of net ecosystem productivity in the Amazon basin: An analysis of the interannual variability in the boundless carbon cycle | |
Hastie, Adam1,2; Lauerwald, Ronny1,3; Ciais, Philippe4; Regnier, Pierre1 | |
2019-06-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2019 |
卷号 | 25期号:6页码:2094-2111 |
文章类型 | Article |
语种 | 英语 |
国家 | Belgium; Scotland; England; France |
英文摘要 | The river-floodplain network plays an important role in the carbon (C) cycle of the Amazon basin, as it transports and processes a significant fraction of the C fixed by terrestrial vegetation, most of which evades as CO2 from rivers and floodplains back to the atmosphere. There is empirical evidence that exceptionally dry or wet years have an impact on the net C balance in the Amazon. While seasonal and interannual variations in hydrology have a direct impact on the amounts of C transferred through the river-floodplain system, it is not known how far the variation of these fluxes affects the overall Amazon C balance. Here, we introduce a new wetland forcing file for the ORCHILEAK model, which improves the representation of floodplain dynamics and allows us to closely reproduce data-driven estimates of net C exports through the river-floodplain network. Based on this new wetland forcing and two climate forcing datasets, we show that across the Amazon, the percentage of net primary productivity lost to the river-floodplain system is highly variable at the interannual timescale, and wet years fuel aquatic CO2 evasion. However, at the same time overall net ecosystem productivity (NEP) and C sequestration are highest during wet years, partly due to reduced decomposition rates in water-logged floodplain soils. It is years with the lowest discharge and floodplain inundation, often associated with El Nino events, that have the lowest NEP and the highest total (terrestrial plus aquatic) CO2 emissions back to atmosphere. Furthermore, we find that aquatic C fluxes display greater variation than terrestrial C fluxes, and that this variation significantly dampens the interannual variability in NEP of the Amazon basin. These results call for a more integrative view of the C fluxes through the vegetation-soil-river-floodplain continuum, which directly places aquatic C fluxes into the overall C budget of the Amazon basin. |
英文关键词 | Amazon boundless carbon cycle carbon CO2 evasion ENSO floodplains interannual variation NEP |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467441900018 |
WOS关键词 | HYDROLOGICAL CYCLE ; ORGANIC-CARBON ; CO2 EVASION ; CLIMATE ; LAND ; RIVERS ; VEGETATION ; DYNAMICS ; ORCHIDEE ; SYSTEM |
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/183823 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Libre Bruxelles, Dept Geosci Environm & Soc, Biogeochem & Earth Syst Modelling, Brussels, Belgium; 2.Univ Edinburgh, Sch GeoSci, Edinburgh, Midlothian, Scotland; 3.Univ Exeter, Coll Engn Math & Phys Sci, Exeter, Devon, England; 4.CEA CNRS UVSQ, UMR8212, Lab Sci Climat & Environm, Gif Sur Yvette, France |
推荐引用方式 GB/T 7714 | Hastie, Adam,Lauerwald, Ronny,Ciais, Philippe,et al. Aquatic carbon fluxes dampen the overall variation of net ecosystem productivity in the Amazon basin: An analysis of the interannual variability in the boundless carbon cycle[J]. GLOBAL CHANGE BIOLOGY,2019,25(6):2094-2111. |
APA | Hastie, Adam,Lauerwald, Ronny,Ciais, Philippe,&Regnier, Pierre.(2019).Aquatic carbon fluxes dampen the overall variation of net ecosystem productivity in the Amazon basin: An analysis of the interannual variability in the boundless carbon cycle.GLOBAL CHANGE BIOLOGY,25(6),2094-2111. |
MLA | Hastie, Adam,et al."Aquatic carbon fluxes dampen the overall variation of net ecosystem productivity in the Amazon basin: An analysis of the interannual variability in the boundless carbon cycle".GLOBAL CHANGE BIOLOGY 25.6(2019):2094-2111. |
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