Impacts of fine root turnover on forest NPP and soil C sequestration potential
Impacts of fine root turnover on forest NPP and soil C sequestration potential
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DOI：
10.1126/science.1089543
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发表时间：
2003-11-21
期刊：
影响因子：
56.9
通讯作者：
Schlesinger, WH
中科院分区：
文献类型：
--
作者：
Matamala, R;Gonzàlez-Meler, MA;Schlesinger, WH
森林净初级生产力的估计需要对根系生产和周转的准确估计。我们评估了根周转与使用同位素示踪剂在两个森林自由空气二氧化碳富集实验。在二氧化碳浓度升高的生长并没有加速根周转无论是在松树或阔叶林。细根碳周转量从1.2年到9年不等，取决于根直径和优势树种。这些长的周转时间表明，森林中的根系生产和周转被高估了，森林土壤中人为大气碳的固存可能低于目前的估计。
Estimates of forest net primary production (NPP) demand accurate estimates of root production and turnover. We assessed root turnover with the use of an isotope tracer in two forest free-air carbon dioxide enrichment experiments. Growth at elevated carbon dioxide did not accelerate root turnover in either the pine or the hardwood forest. Turnover of fine root carbon varied from 1.2 to 9 years, depending on root diameter and dominant tree species. These long turnover times suggest that root production and turnover in forests have been overestimated and that sequestration of anthropogenic atmospheric carbon in forest soils may be lower than currently estimated.