Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aad363 |
Ecosystem carbon dynamics differ between tundra shrub types in the western Canadian Arctic | |
Street, Lorna E.1,2; Subke, Jens-Arne3; Baxter, Robert4; Dinsmore, Kerry J.5; knoblauch, Christian6; Wookey, Philip A.1,3 | |
2018-08-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2018 |
卷号 | 13期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | Scotland; England; Germany |
英文摘要 | Shrub expansion at high latitudes has been implicated in driving vegetation 'greening' trends and may partially offset CO2 emissions from warming soils. However, we do not yet know how Arctic shrub expansion will impact ecosystem carbon (C) cycling and this limits our ability to forecast changes in net C storage and resulting climate feedbacks. Here we quantify the allocation of photosynthate between different ecosystem components for two common deciduous Arctic shrubs, both of which are increasing in abundance in the study region; green alder (Alnus viridis (Chaix) DC.) and dwarf birch (Betula glandulosa Michx., B.). Using C-13 isotopic labelling, we show that carbon use efficiency (i.e. the fraction of gross photosynthesis remaining after subtracting respiration) in peak growing season is similar between the two shrubs (56 +/- 12% for A. viridis, 59 +/- 6% for B. glandulosa), but that biomass production efficiency (plant C uptake allocated to biomass production, per unit gross photosynthesis) is 56 +/- 14% for A. viridis, versus 31 +/- 2% for B. glandulosa. A significantly greater proportion of recent photosynthate is allocated to woody biomass in A. viridis dominated plots (27 +/- 5%), compared to plots dominated by B. glandulosa (4 +/- 1%). Allocation of C to belowground pools also differs significantly; after 2.5 weeks we recovered 28 +/- 6% of recent photosynthate in root-free soil under B. glandulosa, but under A. viridis we were unable to detect recent photosynthate in the soil. We provide the first evidence that the impact of shrub expansion on Arctic C cycling will be species dependant. Where Betula dominates, similar to 1/3 of recently photosynthesised C will be rapidly allocated belowground to soil and microbial pools. Where Alnus dominates, more recently fixed C will be allocated to woody biomass. We conclude that models driven by remotely-sensed aboveground canopy characteristics alone (i.e. greenness) will be unable to accurately represent the impact of vegetation change on Arctic C storage. |
英文关键词 | allocation biomass production efficiency carbon use efficiency photosynthesis respiration C-13 Clabelling nitrogen |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000440579800002 |
WOS关键词 | SECONDARY SUCCESSIONAL CHRONOSEQUENCE ; CLIMATE-CHANGE ; NITROGEN-FIXATION ; BIOMASS ; STORAGE ; RESPIRATION ; VEGETATION ; TEMPERATE ; FRUTICOSA ; EXPANSION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
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/34341 |
专题 | 气候变化 |
作者单位 | 1.Heriot Watt Univ, Sch Life Sci, Edinburgh EH14 4AS, Midlothian, Scotland; 2.Univ Edinburgh, Sch GeoSci, Edinburgh EH9 3FF, Midlothian, Scotland; 3.Univ Stirling, Fac Nat Sci, Biol & Environm Sci, Stirling FK9 4LA, Scotland; 4.Univ Durham, Sch Biol & Biomed Sci, Durham DH1 3LE, England; 5.Ctr Ecol & Hydrol, Bush Estate, Penicuik EH26 0QB, Midlothian, Scotland; 6.Univ Hamburg, Inst Soil Sci, Allende Pl 2, D-20146 Hamburg, Germany |
推荐引用方式 GB/T 7714 | Street, Lorna E.,Subke, Jens-Arne,Baxter, Robert,et al. Ecosystem carbon dynamics differ between tundra shrub types in the western Canadian Arctic[J]. ENVIRONMENTAL RESEARCH LETTERS,2018,13(8). |
APA | Street, Lorna E.,Subke, Jens-Arne,Baxter, Robert,Dinsmore, Kerry J.,knoblauch, Christian,&Wookey, Philip A..(2018).Ecosystem carbon dynamics differ between tundra shrub types in the western Canadian Arctic.ENVIRONMENTAL RESEARCH LETTERS,13(8). |
MLA | Street, Lorna E.,et al."Ecosystem carbon dynamics differ between tundra shrub types in the western Canadian Arctic".ENVIRONMENTAL RESEARCH LETTERS 13.8(2018). |
条目包含的文件 | 条目无相关文件。 |
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