期刊
NEW PHYTOLOGIST
卷 184, 期 4, 页码 944-949出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1469-8137.2009.03022.x
关键词
13C; Arctic; carbon; decomposition sequestration; grass; moss; plant growth form
资金
- NERC [NE/C514866]
- Natural Environment Research Council [NE/C514866/1] Funding Source: researchfish
P>This study investigates the influence of vegetation composition on carbon (C) sequestration in a moss-dominated ecosystem in the Arctic. A 13C labelling study in an arctic wet meadow was used to trace assimilate into C pools of differing recalcitrance within grasses and mosses and to determine the retention of C by these plant groups. Moss retained 70% of assimilated 13C over the month following labelling, which represented half the growing season. By contrast, the vascular plants, comprising mostly grasses, retained only 40%. The mechanism underlying this was that moss allocated 80% of the 13C to recalcitrant C pools, a much higher proportion than in grasses (56%). This method enabled elucidation of a plant trait that will influence decomposition and hence persistence of assimilated C in the ecosystem. We predict that moss-dominated vegetation will retain sequestered C more strongly than a grass-dominated community. Given the strong environmental drivers that are causing a shift from moss to grass dominance, this is likely to result in a reduction in future ecosystem C sink strength.
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