Institute of Carbon Neutrality, Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, 100871, Beijing, China.
State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101, Beijing, China.
Nat Commun. 2023 Jun 2;14(1):3196. doi: 10.1038/s41467-023-38911-w.
Forestation is regarded as an effective strategy for increasing terrestrial carbon sequestration. However, its carbon sink potential remains uncertain due to the scarcity of large-scale sampling data and limited knowledge of the linkage between plant and soil C dynamics. Here, we conduct a large-scale survey of 163 control plots and 614 forested plots involving 25304 trees and 11700 soil samples in northern China to fill this knowledge gap. We find that forestation in northern China contributes a significant carbon sink (913.19 ± 47.58 Tg C), 74% of which is stored in biomass and 26% in soil organic carbon. Further analysis reveals that the biomass carbon sink increases initially but then decreases as soil nitrogen increases, while soil organic carbon significantly decreases in nitrogen-rich soils. These results highlight the importance of incorporating plant and soil interactions, modulated by nitrogen supply in the calculation and modelling of current and future carbon sink potential.
造林被认为是增加陆地碳固存的有效策略。然而，由于缺乏大规模采样数据和对植物与土壤碳动态之间联系的认识有限，其碳汇潜力仍不确定。在这里，我们在中国北方进行了一项大规模的调查，涉及 163 个对照样地和 614 个森林样地，涉及 25304 棵树和 11700 个土壤样本，以填补这一知识空白。我们发现，中国北方的造林对碳汇有显著贡献（913.19±47.58 太克碳），其中 74%储存在生物量中，26%储存在土壤有机碳中。进一步的分析表明，生物量碳汇最初会增加，但随着土壤氮的增加而减少，而在富氮土壤中，土壤有机碳则显著减少。这些结果强调了在计算和建模当前和未来碳汇潜力时，考虑植物和土壤相互作用以及氮供应调节的重要性。
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