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首页> 外文期刊>Ecosystems >The Importance of Aquatic Carbon Fluxes in Net Ecosystem Carbon Budgets: A Catchment-Scale Review
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The Importance of Aquatic Carbon Fluxes in Net Ecosystem Carbon Budgets: A Catchment-Scale Review

机译：水生碳通量在净生态系统碳预算中的重要性：集水区审查

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The growing importance of resolving ecosystem carbon budgets has resulted in more studies integrating terrestrial and aquatic carbon fluxes. Although recent estimates highlight the importance of inland waters in global carbon budgets, the extent to which aquatic pathways contribute to the net ecosystem carbon budget (NECB) of different ecosystems remains poorly understood. Here, we provide a cross-ecosystem review of annual carbon budgets integrating terrestrial and aquatic fluxes. Large variability in the proportion of aquatic carbon offset to terrestrial net ecosystem productivity (NEP) was observed, with aquatic offsets ranging from 1% in a boreal forest to 590% in a freshwater marsh. The total aquatic carbon flux was positively correlated with terrestrial NEP, suggesting highly productive ecosystems will have greater aquatic carbon offsets. However, due to an order of magnitude difference in the range of terrestrial NEP (similar to 1000gCm(-2)y(-1)) compared to aquatic fluxes (similar to 100gCm(-2)y(-1)), ecosystems with small NEP's had greater relative aquatic carbon offsets overall in their NECB's. Northern hemisphere peatlands and forests represented 54% of all integrated carbon budget studies collected, indicating a severe ecosystem and spatial bias. Mangroves, agricultural, and disturbed ecosystems were the most underrepresented, yet had extreme ranges in terrestrial NEP and NECB (-638 to 1170gCm(-2)y(-1)). To improve our mechanistic understanding of the role of aquatic pathways in NECB's, more site-specific integrative studies need to be undertaken across a broader range of climatic regions and ecosystem types.
机译：解决生态系统碳预算的越来越重要导致了综合陆地和水生碳通量的更多研究。尽管最近的估计突出了内陆水域在全球碳预算的重要性，但水生途径对不同生态系统的净生态系统碳预算（NECB）的程度仍然明白。在这里，我们提供了整合陆地和水生势态的年度碳预算的交叉生态系统综述。观察到陆地净净生态系统生产率（NEP）的水生碳偏移比例的大幅变异，水生散液范围从爆炸林中的北方森林中的590％左右。总水生碳通量与陆地奈普呈正相关，表明高生产率生态系统将具有更大的水生碳偏移。然而，由于与水生助焊剂（类似于100GCM（-2）y（-1）），生态系统（类似于1000gcm（-2）y（-1）），因此小型NEP在他们的NECB中总体上有更大的水生碳抵消。北半球泥炭地和森林占收集的所有综合碳预算研究的54％，表明严重的生态系统和空间偏见。红树林，农业和受扰动的生态系统是最强名的，但陆地NEP和NECB（-638至1170克（-2）y（-1））具有极端范围。为了提高对NECB中水生途径的作用的机制理解，需要在更广泛的气候区域和生态系统类型中进行更多的特定于网站的综合研究。

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