Evidence for Edge Enhancements of Soil Respiration in Temperate Forests
Evidence for Edge Enhancements of Soil Respiration in Temperate Forests
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DOI：
10.1029/2019gl082459
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发表时间：
2019-04
影响因子：
5.2
通讯作者：
I. Smith;L. Hutyra;A. Reinmann;Jonathan R. Thompson;D. Allen
中科院分区：
文献类型：
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作者：
I. Smith;L. Hutyra;A. Reinmann;Jonathan R. Thompson;D. Allen
森林破碎化影响碳吸收和储存;然而，破碎化对土壤呼吸的影响的程度和方向仍然不清楚。我们量化土壤呼吸率沿沿着边缘到内部样带在美国东部的两个温带阔叶林，不同的气候，物种组成和土壤类型。我们观察到平均土壤呼吸率高15-26%，在森林边缘相比，内部，对应于大梯度的土壤温度。结果表明，林缘和林内土壤呼吸对温度的敏感性无显著差异。小环境的破碎化和由此产生的变化改变了森林生产力和森林边缘附近的土壤呼吸。生态系统模型目前并不代表边缘动态，但鉴于景观破碎化的普遍性及其对沿着森林边缘碳循环的影响，这种遗漏可能会在我们对陆地碳动态的理解中引入一个重要的不确定性来源。
Forest fragmentation impacts carbon uptake and storage; however, the magnitude and direction of fragmentation impacts on soil respiration remain poorly characterized. We quantify soil respiration rates along edge‐to‐interior transects in two temperate broadleaf forests in the eastern United States that vary in climate, species composition, and soil type. We observe average soil respiration rates 15–26% higher at the forest edge compared to the interior, corresponding to large gradients in soil temperature. We find no significant difference in the sensitivity of soil respiration to temperature between the forest edge and interior. Fragmentation and resultant shifts in microenvironment alter forest productivity and soil respiration near forest edges. Ecosystem models do not currently represent edge dynamics, but given the prevalence of landscape fragmentation and its effect on carbon cycling along forest edges, this omission likely introduces an important source of uncertainty in our understanding of terrestrial carbon dynamics with a changing landscape and climate.