Relationships between forest fine and coarse woody debris carbon stocks across latitudinal gradients in the United States as an indicator of climate change effects
Relationships between forest fine and coarse woody debris carbon stocks across latitudinal gradients in the United States as an indicator of climate change effects
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DOI：
10.1016/j.ecolind.2007.11.002
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发表时间：
2008-09
影响因子：
6.9
通讯作者：
C. Woodall;G. Liknes
中科院分区：
文献类型：
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作者：
C. Woodall;G. Liknes
粗、细木质物质（CWD和FWD）是森林生态系统重要的碳储量。人们对这些碎屑碳储量如何应对气候变化缺乏了解。这项研究使用了美国全国范围内的CWD和FWD库存，以研究这些C库存如何随纬度而变化。结果表明，最高的CWD和FWD C库存被发现在森林中的最高纬度，而相反，最低的C库存被发现在最南部的森林。CWD和FWD对纬度变化的反应不同，CWD C库存随着纬度的降低而下降得更快。如果纬度可以被广泛地假定为指示温度和碎屑衰变的潜在速率，则可以假定，如果温度升高，化学品消耗殆尽的C库存可能处于成为净C源的最高风险。CWD和FWD碳储量大致相等的纬度（平衡点）可以作为全球变暖情景下碳储量平衡变化的指标。鉴于碎屑碳储量，生物量的生产/衰减，和气候变量之间的复杂关系，建议进一步研究，以完善这项研究的指标。
Coarse and fine woody materials (CWD and FWD) are substantial forest ecosystem carbon (C) stocks. There is a lack of understanding how these detritus C stocks may respond to climate change. This study used a nation-wide inventory of CWD and FWD in the United States to examine how these C stocks vary by latitude. Results indicate that the highest CWD and FWD C stocks are found in forests with the highest latitude, while conversely the lowest C stocks are found in the most southerly forests. CWD and FWD respond differently to changes in latitude with CWD C stocks decreasing more rapidly as latitude decreased. If latitude can be broadly assumed to indicate temperature and potential rate of detrital decay, it may be postulated that CWD C stocks may be at the highest risk of becoming a net C source if temperatures increase. The latitude at which CWD and FWD C stocks roughly equal each other (equilibrium point) may serve as an indicator of changes in C stock equilibrium under a global warming scenario. Given the complex relationships between detrital C stocks, biomass production/decay, and climatic variables, further research is suggested to refine this study's indicator.