Leaching of dissolved organic carbon from mineral soils plays a significant role in the terrestrial carbon balance.
Leaching of dissolved organic carbon from mineral soils plays a significant role in the terrestrial carbon balance.
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DOI：
10.1111/gcb.15460
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发表时间：
2020-11-28
影响因子：
11.6
通讯作者：
Friedlingstein P
中科院分区：
文献类型：
--
作者：
Nakhavali M;Lauerwald R;Regnier P;Guenet B;Chadburn S;Friedlingstein P
溶解有机碳（DOC）从土壤向河网的淋滤是陆地土壤碳收支中一个被忽视的组成部分。土壤、径流和排水中DOC浓度的测量很少，其空间分布高度偏向工业化国家。因此，陆地DOC淋失对陆地生态系统全球尺度碳平衡的贡献仍然知之甚少。在此，利用基于过程的综合建模方法对现有观测结果进行升级，我们估计全球陆地DOC淋失通量为0.28±0.07 Gt C年−1，这是保守的，因为它只包括矿物土壤的贡献。我们的研究结果表明，全球约15%的陆地生态系统净生产力（NEP，以净初级生产与土壤呼吸之间的差计算）以沥滤DOC的形式输出到水生系统。在热带雨林中，陆地NEP的淋滤率甚至达到22%。此外，我们还模拟了1860 - 2010年DOC从土壤向河网淋滤的时空趋势。我们估计，从1860年到2010年，全球陆地DOC输入河网的年- 1增加了35 Tg C（14%）。尽管它们对DOC淋失通量的全球贡献较低，但在历史时期（19世纪60年代与2000年代相比），北方地区的相对增幅最高（28%），而热带地区的相对增幅最低（9%）。我们的观测约束模式方法的结果表明，在区域和全球尺度上，DOC淋失是陆地碳收支的一个重要通量。利用基于过程的综合建模方法对现有观测结果进行升级，我们估计全球陆地DOC淋滤通量为0.28±0.07 Gt C年−1，这是保守的，因为它只包括矿物土壤的贡献。我们的研究结果表明，全球大约15%的陆地生态系统净生产力以沥滤DOC的形式输出到水生系统。在热带雨林中，陆地NEP的淋滤率甚至达到22%。
The leaching of dissolved organic carbon (DOC) from soils to the river network is an overlooked component of the terrestrial soil C budget. Measurements of DOC concentrations in soil, runoff and drainage are scarce and their spatial distribution highly skewed towards industrialized countries. The contribution of terrestrial DOC leaching to the global‐scale C balance of terrestrial ecosystems thus remains poorly constrained. Here, using a process based, integrative, modelling approach to upscale from existing observations, we estimate a global terrestrial DOC leaching flux of 0.28 ± 0.07 Gt C year−1 which is conservative, as it only includes the contribution of mineral soils. Our results suggest that globally about 15% of the terrestrial Net Ecosystem Productivity (NEP, calculated as the difference between Net Primary Production and soil respiration) is exported to aquatic systems as leached DOC. In the tropical rainforest, the leached fraction of terrestrial NEP even reaches 22%. Furthermore, we simulated spatial‐temporal trends in DOC leaching from soil to the river networks from 1860 to 2010. We estimated a global increase in terrestrial DOC inputs to river network of 35 Tg C year−1 (14%) from 1860 to 2010. Despite their low global contribution to the DOC leaching flux, boreal regions have the highest relative increase (28%) while tropics have the lowest relative increase (9%) over the historical period (1860s compared to 2000s). The results from our observationally constrained model approach demonstrate that DOC leaching is a significant flux in the terrestrial C budget at regional and global scales. Using a process‐based, integrative, modelling approach to upscale from existing observations, we estimate a global terrestrial DOC leaching flux of 0.28 ± 0.07 Gt C year−1 which is conservative, as it only includes the contribution of mineral soils. Our results suggest that globally about 15% of the terrestrial Net Ecosystem Productivity is exported to aquatic systems as leached DOC. In the tropical rainforest, the leached fraction of terrestrial NEP even reaches 22%.
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影响因子：
20.6
作者：
Ciais P;Yao Y;Gasser T;Baccini A;Wang Y;Lauerwald R;Peng S;Bastos A;Li W;Raymond PA;Canadell JG;Peters GP;Andres RJ;Chang J;Yue C;Dolman AJ;Haverd V;Hartmann J;Laruelle G;Konings AG;King AW;Liu Y;Luyssaert S;Maignan F;Patra PK;Peregon A;Regnier P;Pongratz J;Poulter B;Shvidenko A;Valentini R;Wang R;Broquet G;Yin Y;Zscheischler J;Guenet B;Goll DS;Ballantyne AP;Yang H;Qiu C;Zhu D
通讯作者：
Zhu D
影响因子：
64.8
作者：
Gedney, N;Cox, PM;Stott, PA
通讯作者：
Stott, PA
DOI：
10.1002/joc.3711
发表时间：
2014-03-15
期刊：
INTERNATIONAL JOURNAL OF CLIMATOLOGY
影响因子：
--
作者：
Harris, I.;Jones, P. D.;Lister, D. H.
通讯作者：
Lister, D. H.
影响因子：
5.1
作者：
Bowring, Simon P. K.;Lauerwald, Ronny;Ciais, Philippe
通讯作者：
Ciais, Philippe
影响因子：
56.9
作者：
Janssens, IA;Freibauer, A;Dolman, AJ
通讯作者：
Dolman, AJ