Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2020790118 |
Nitrogen deposition accelerates soil carbon sequestration in tropical forests | |
Xiankai Lu; Peter M. Vitousek; Qinggong Mao; Frank S. Gilliam; Yiqi Luo; Benjamin L. Turner; Guoyi Zhou; Jiangming Mo | |
2021-04-20 | |
发表期刊 | Proceedings of the National Academy of Sciences |
出版年 | 2021 |
英文摘要 | Terrestrial ecosystem carbon (C) sequestration plays an important role in ameliorating global climate change. While tropical forests exert a disproportionately large influence on global C cycling, there remains an open question on changes in below-ground soil C stocks with global increases in nitrogen (N) deposition, because N supply often does not constrain the growth of tropical forests. We quantified soil C sequestration through more than a decade of continuous N addition experiment in an N-rich primary tropical forest. Results showed that long-term N additions increased soil C stocks by 7 to 21%, mainly arising from decreased C output fluxes and physical protection mechanisms without changes in the chemical composition of organic matter. A meta-analysis further verified that soil C sequestration induced by excess N inputs is a general phenomenon in tropical forests. Notably, soil N sequestration can keep pace with soil C, based on consistent C/N ratios under N additions. These findings provide empirical evidence that below-ground C sequestration can be stimulated in mature tropical forests under excess N deposition, which has important implications for predicting future terrestrial sinks for both elevated anthropogenic CO2 and N deposition. We further developed a conceptual model hypothesis depicting how soil C sequestration happens under chronic N deposition in N-limited and N-rich ecosystems, suggesting a direction to incorporate N deposition and N cycling into terrestrial C cycle models to improve the predictability on C sink strength as enhanced N deposition spreads from temperate into tropical systems. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/322845 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Xiankai Lu,Peter M. Vitousek,Qinggong Mao,et al. Nitrogen deposition accelerates soil carbon sequestration in tropical forests[J]. Proceedings of the National Academy of Sciences,2021. |
APA | Xiankai Lu.,Peter M. Vitousek.,Qinggong Mao.,Frank S. Gilliam.,Yiqi Luo.,...&Jiangming Mo.(2021).Nitrogen deposition accelerates soil carbon sequestration in tropical forests.Proceedings of the National Academy of Sciences. |
MLA | Xiankai Lu,et al."Nitrogen deposition accelerates soil carbon sequestration in tropical forests".Proceedings of the National Academy of Sciences (2021). |
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