Empirical estimates of regional carbon budgets imply reduced global soil heterotrophic respiration.
Empirical estimates of regional carbon budgets imply reduced global soil heterotrophic respiration.
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DOI：
10.1093/nsr/nwaa145
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发表时间：
2021-03
影响因子：
20.6
通讯作者：
Zhu D
中科院分区：
文献类型：
--
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
解决区域碳预算问题对于为陆地减缓政策提供信息至关重要。对于几乎覆盖整个地球仪的九个地区，我们收集了碳储量变化的库存估计值，并在库存数据缺失的情况下补充了生物量变化的卫星估计值。通过计算碳储量变化和来自农作物和木材贸易的横向碳通量以及河流向海洋的碳输出，计算了陆地-大气净碳交换（NEE）。综合所有区域的NEE，我们得到了全球陆地人为CO2净吸收的“自下而上”NEE为-2.2 ± 0.6 PgC yr−1，与2000-2009年全球大气碳收支中独立的自上而下的NEE一致。这是迄今为止最全面的全球自下而上的碳收支核算，为全球碳循环研究树立了一个重要里程碑。通过将NEE分解为组分通量，我们发现全球土壤异养呼吸相当于39 PgC yr−1的CO2来源，四分位数为33-46 PgC yr−1-净初级生产力的比例比以前报道的要小得多。
Resolving regional carbon budgets is critical for informing land-based mitigation policy. For nine regions covering nearly the whole globe, we collected inventory estimates of carbon-stock changes complemented by satellite estimates of biomass changes where inventory data are missing. The net land–atmospheric carbon exchange (NEE) was calculated by taking the sum of the carbon-stock change and lateral carbon fluxes from crop and wood trade, and riverine-carbon export to the ocean. Summing up NEE from all regions, we obtained a global ‘bottom-up’ NEE for net land anthropogenic CO2 uptake of –2.2 ± 0.6 PgC yr−1 consistent with the independent top-down NEE from the global atmospheric carbon budget during 2000–2009. This estimate is so far the most comprehensive global bottom-up carbon budget accounting, which set up an important milestone for global carbon-cycle studies. By decomposing NEE into component fluxes, we found that global soil heterotrophic respiration amounts to a source of CO2 of 39 PgC yr−1 with an interquartile of 33–46 PgC yr−1—a much smaller portion of net primary productivity than previously reported.
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影响因子：
56.9
作者：
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通讯作者：
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通讯作者：
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