Model responses to CO(2) and warming are underestimated without explicit representation of Arctic small-mammal grazing.
Model responses to CO(2) and warming are underestimated without explicit representation of Arctic small-mammal grazing.
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对CO（2）和变暖的模型反应被低估了，而无需明确表示北极小哺乳动物放牧。
DOI：
10.1002/eap.2478
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发表时间：
2022-01
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影响因子：
--
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中科院分区：
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--
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我们使用陆地生态系统中碳氮循环耦合的简单模型来研究“明确代表食草动物”与“模型中的食草动物效应与其他生物地球化学过程隐式聚合”如何改变对二氧化碳升高和变暖的预测反应。聚合方法可以影响模型预测，因为与通常聚合的过程相比，放牧介导的过程对气候变化的反应不同。我们以苔原上的小型哺乳动物食草动物为例，发现典型的三到四年的循环频率太快，循环峰谷的影响无法在生态系统生物地球化学中充分体现。我们的结论是，相对于明确表示食草动物影响的估计，将小哺乳动物食草动物的影响与其他过程隐式汇总会导致低估生态系统对气候变化的响应。这种低估的程度随着食草动物密度的增加而增加。因此，我们建议在应用生态系统对全球变化的响应模型时明确考虑放牧效应。
We use a simple model of coupled carbon and nitrogen cycles in terrestrial ecosystems to examine how “explicitly representing grazers” vs. “having grazer effects implicitly aggregated in with other biogeochemical processes in the model” alters predicted responses to elevated carbon dioxide and warming. The aggregated approach can affect model predictions because grazer‐mediated processes can respond differently to changes in climate compared with the processes with which they are typically aggregated. We use small‐mammal grazers in a tundra as an example and find that the typical three‐to‐four‐year cycling frequency is too fast for the effects of cycle peaks and troughs to be fully manifested in the ecosystem biogeochemistry. We conclude that implicitly aggregating the effects of small‐mammal grazers with other processes results in an underestimation of ecosystem response to climate change, relative to estimations in which the grazer effects are explicitly represented. The magnitude of this underestimation increases with grazer density. We therefore recommend that grazing effects be incorporated explicitly when applying models of ecosystem response to global change.
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