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Warming-induced vegetation growth cancels out soil carbon-climate feedback in the northern Asian permafrost region in the 21st century
 

第一作者:

Liu, Jianzhao

英文第一作者:

Liu, Jianzhao

联系作者:

Song, Changchun

英文联系作者:

Song, Changchun

发表年度:

2022

卷:

17

摘要:

Permafrost soils represent an enormous carbon (C) pool that is highly vulnerable to climate warming. We used the model output ensemble of the Coupled Model Intercomparison Project Phase 6 to estimate the C storage in soil, litter, and vegetation in the current extent of northern Asian permafrost during 1900-2100. The contemporary (1995-2014) C storage was estimated to be 368.1 +/- 82.5 Pg C for the full column depth of the soil, 13.3 +/- 4.6 Pg C in litter, and 22.2 +/- 3.2 Pg C in vegetation biomass, while these C storage levels are projected to decline by 3.9 Pg C (1.1%) in soils, increase of 0.03 Pg C (0.2%) in litter, and increase by 21.1 Pg C (95.3%) in vegetation biomass by the end of the 21st century under SSP585. The total C storage was dominated by warming-induced vegetation growth. Partial correlation analysis showed that surface air temperature (TAS), soil liquid water, and soil mineral nitrogen (SMN) dominated the soil and vegetation C pools, while SMN controlled litter C during the historical period. Under future scenarios, TAS and SMN dominated the changes of soil and litter C, while TAS determined the vegetation C increase. The growing soil C loss with warming indicates positive C-climate feedback in soils; this warming-induced acceleration of soil C loss was canceled out by the enhanced vegetation C accumulation, leading to a strong C sink in the 21st century.

刊物名称:

Environmental Research Letters

参与作者:

J. Z. Liu, F. H. Yuan, Y. J. Zuo, R. Zhou, X. H. Zhu, K. X. Li, N. N. Wang, N. Chen, Z. Y. Guo, L. H. Zhang, Y. Sun, Y. D. Guo, C. C. Song and X. F. Xu