Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13638 |
Direct and indirect climate change effects on carbon dioxide fluxes in a thawing boreal forest-wetland landscape | |
Helbig, Manuel1,2; Chasmer, Laura E.3; Desai, Ankur R.4; Kljun, Natascha5; Quinton, William L.6; Sonnentag, Oliver1,2 | |
2017-08-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA; Wales |
英文摘要 | In the sporadic permafrost zone of northwestern Canada, boreal forest carbon dioxide (CO2) fluxes will be altered directly by climate change through changing meteorological forcing and indirectly through changes in landscape functioning associated with thaw-induced collapse-scar bog (` wetland') expansion. However, their combined effect on landscape-scale net ecosystem CO2 exchange (NEELAND), resulting from changing gross primary productivity (GPP) and ecosystem respiration (ER), remains unknown. Here, we quantify indirect land cover change impacts on NEELAND and direct climate change impacts on modeled temperature-and light-limited NEELAND of a boreal forestwetland landscape. Using nested eddy covariance flux towers, we find both GPP and ER to be larger at the landscape compared to the wetland level. However, annual NEELAND (-20 g C m(-2)) and wetland NEE (-24 g C m(-2)) were similar, suggesting negligible wetland expansion effects on NEELAND. In contrast, we find non-negligible direct climate change impacts when modeling NEELAND using projected air temperature and incoming shortwave radiation. At the end of the 21st century, modeled GPP mainly increases in spring and fall due to reduced temperature limitation, but becomes more frequently light-limited in fall. In a warmer climate, ER increases year-round in the absence of moisture stress resulting in net CO2 uptake increases in the shoulder seasons and decreases during the summer. Annually, landscape net CO2 uptake is projected to decline by 25 +/- 14 g C m(-2) for a moderate and 103 +/- 38 g C m(-2) for a high warming scenario, potentially reversing recently observed positive net CO2 uptake trends across the boreal biome. Thus, even without moisture stress, net CO2 uptake of boreal forest-wetland landscapes may decline, and ultimately, these landscapes may turn into net CO2 sources under continued anthropogenic CO2 emissions. We conclude that NEELAND changes are more likely to be driven by direct climate change rather than by indirect land cover change impacts. |
英文关键词 | boreal forest carbon dioxide climate change ecosystem respiration eddy covariance gross primary productivity permafrost wetlands |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404863300023 |
WOS关键词 | NET ECOSYSTEM EXCHANGE ; ELEVATED GROWTH TEMPERATURES ; BLACK SPRUCE FORESTS ; PERMAFROST THAW ; DISCONTINUOUS PERMAFROST ; NORTHWEST-TERRITORIES ; NORTHERN ECOSYSTEMS ; THERMAL ADAPTATION ; PEAT ACCUMULATION ; METHANE EMISSION |
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/17614 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Montreal, Dept Geog, 520 Chemin Cote St Catherine, Montreal, PQ H2V 2B8, Canada; 2.Univ Montreal, Ctr Etud Nord, 520 Chemin Cote St Catherine, Montreal, PQ H2V 2B8, Canada; 3.Univ Lethbridge, Dept Geog, Lethbridge, AB T1K 3M4, Canada; 4.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA; 5.Swansea Univ, Dept Geog, Singleton Pk, Swansea SA2 8PP, W Glam, Wales; 6.Wilfrid Laurier Univ, Cold Reg Res Ctr, Waterloo, ON N2L 3C5, Canada |
推荐引用方式 GB/T 7714 | Helbig, Manuel,Chasmer, Laura E.,Desai, Ankur R.,et al. Direct and indirect climate change effects on carbon dioxide fluxes in a thawing boreal forest-wetland landscape[J]. GLOBAL CHANGE BIOLOGY,2017,23(8). |
APA | Helbig, Manuel,Chasmer, Laura E.,Desai, Ankur R.,Kljun, Natascha,Quinton, William L.,&Sonnentag, Oliver.(2017).Direct and indirect climate change effects on carbon dioxide fluxes in a thawing boreal forest-wetland landscape.GLOBAL CHANGE BIOLOGY,23(8). |
MLA | Helbig, Manuel,et al."Direct and indirect climate change effects on carbon dioxide fluxes in a thawing boreal forest-wetland landscape".GLOBAL CHANGE BIOLOGY 23.8(2017). |
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