Decadal fates and impacts of nitrogen additions on temperate forest carbon storage: a data-model comparison
Decadal fates and impacts of nitrogen additions on temperate forest carbon storage: a data-model comparison
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DOI：
10.5194/bg-16-2771-2019
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发表时间：
2019-07-16
期刊：
影响因子：
4.9
通讯作者：
Goodale, Christine L.
中科院分区：
文献类型：
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作者：
Cheng, Susan J.;Hess, Peter G.;Goodale, Christine L.
为了准确地捕捉地球系统模型中氮（N）对陆地碳汇（C）的影响，模型对氮限制和生态系统氮增加的响应（例如，大气氮沉降和肥料）需要进行评估。土地碳汇对氮添加的反应取决于这些添加物的命运：即，有多少添加的氮通过氮损失途径从生态系统中损失，或者被回收并用于增加植物和土壤中的碳储存。在这里，我们评估了最新版本的全球土地模型，社区土地模型版本5（CLM 5）的C-N动态，以及当生态系统有大量的N输入和损失时，它们是如何变化的（即，开路N周期）或小的N输入和损耗（即，封闭的N循环）。这种比较使我们能够确定CLM 5的潜在改进，这些改进将适用于沿着开放到闭合频谱的模拟N个周期。我们也比较短-（
To accurately capture the impacts of nitrogen (N) on the land carbon (C) sink in Earth system models, model responses to both N limitation and ecosystem N additions (e.g., from atmospheric N deposition and fertilizer) need to be evaluated. The response of the land C sink to N additions depends on the fate of these additions: that is, how much of the added N is lost from the ecosystem through N loss pathways or recovered and used to increase C storage in plants and soils. Here, we evaluate the C-N dynamics of the latest version of a global land model, the Community Land Model version 5 (CLM5), and how they vary when ecosystems have large N inputs and losses (i.e., an open N cycle) or small N inputs and losses (i.e., a closed N cycle). This comparison allows us to identify potential improvements to CLM5 that would apply to simulated N cycles along the open-to-closed spectrum. We also compare the short- (