The role of mosses in carbon uptake and partitioning in arctic vegetation.
The role of mosses in carbon uptake and partitioning in arctic vegetation.
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DOI：
10.1111/nph.12285
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发表时间：
2013-07
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影响因子：
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通讯作者：
L. Street;J. Subke;M. Sommerkorn;V. Sloan;Helene Ducrotoy;G. Phoenix;M. Williams
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作者：
L. Street;J. Subke;M. Sommerkorn;V. Sloan;Helene Ducrotoy;G. Phoenix;M. Williams
北极已经经历了植物群落组成的变化，因此了解不同植被成分对碳（C）循环的贡献对于准确量化生态系统C平衡至关重要。藓类植物对生物量的贡献很大，但它们对碳利用效率（CUE）的影响-总初级生产力（GPP）纳入增长的比例-以及地上与地下C分配知之甚少。我们使用（13）C脉冲标记跟踪同化的C在苔藓（泥炭藓组Acutifolia和Pleurozium schreberi）和矮灌木P. schreberi植被在亚北极芬兰。基于（13）C库和通量，定量分析了藓类植物对GPP、CUE和分配的贡献。苔藓植物将20 ± 9%的生态系统GPP转化为生物量。泥炭藓的CUE为68- 71%，长白山云杉为62-81%，矮生灌丛长白山云杉为58- 74%。地下C的掺入量为GPP的10 ± 2%，而维管植物单独掺入地下固定C的15 ± 4%。我们已经证明，苔藓强烈影响北极矮灌木植被的碳吸收和保留。它们增加了CUE和GPP在地上分配的分数。北极碳模型必须包括苔藓，以准确地代表生态系统碳动态。
The Arctic is already experiencing changes in plant community composition, so understanding the contribution of different vegetation components to carbon (C) cycling is essential in order to accurately quantify ecosystem C balance. Mosses contribute substantially to biomass, but their impact on carbon use efficiency (CUE) - the proportion of gross primary productivity (GPP) incorporated into growth - and aboveground versus belowground C partitioning is poorly known. We used (13) C pulse-labelling to trace assimilated C in mosses (Sphagnum sect. Acutifolia and Pleurozium schreberi) and in dwarf shrub-P. schreberi vegetation in sub-Arctic Finland. Based on (13) C pools and fluxes, we quantified the contribution of mosses to GPP, CUE and partitioning. Mosses incorporated 20 ± 9% of total ecosystem GPP into biomass. CUE of Sphagnum was 68-71%, that of P. schreberi was 62-81% and that of dwarf shrub-P. schreberi vegetation was 58-74%. Incorporation of C belowground was 10 ± 2% of GPP, while vascular plants alone incorporated 15 ± 4% of their fixed C belowground. We have demonstrated that mosses strongly influence C uptake and retention in Arctic dwarf shrub vegetation. They increase CUE, and the fraction of GPP partitioned aboveground. Arctic C models must include mosses to accurately represent ecosystem C dynamics.