Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15100 |
Trade‐offs in soil carbon protection mechanisms under aerobic and anaerobic conditions | |
Wenjuan Huang; Chenglong Ye; William C. Hockaday; Steven J. Hall | |
2020-04-17 | |
发表期刊 | Global Change Biology
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出版年 | 2020 |
英文摘要 | Oxygen (O2) limitation is generally understood to suppress oil carbon (C) decomposition and is a key mechanism impacting terrestrial C stocks under global change. Yet, O2 limitation may differentially impact kinetic or thermodynamic versus physicochemical C protection mechanisms, challenging our understanding of how soil C may respond to climate‐mediated changes in O2 dynamics. Although O2 limitation may suppress decomposition of new litter C inputs, release of physicochemically protected C due to iron (Fe) reduction could potentially sustain soil C losses. To test this trade‐off, we incubated two disparate upland soils that experience periodic O2 limitation—a tropical rainforest Oxisol and a temperate cropland Mollisol—with added litter under either aerobic (control) or anaerobic conditions for 1 year. Anoxia suppressed total C loss by 27% in the Oxisol and by 41% in the Mollisol relative to the control, mainly due to the decrease in litter‐C decomposition. However, anoxia sustained or even increased decomposition of native soil‐C (11.0% vs. 12.4% in the control for the Oxisol and 12.5% vs. 5.3% in the control for the Mollisol, in terms of initial soil C mass), and it stimulated losses of metal‐ or mineral‐associated C. Solid‐state 13C nuclear magnetic resonance spectroscopy demonstrated that anaerobic conditions decreased protein‐derived C but increased lignin‐ and carbohydrate‐C relative to the control. Our results indicate a trade‐off between physicochemical and kinetic/thermodynamic C protection mechanisms under anaerobic conditions, whereby decreased decomposition of litter C was compensated by more extensive loss of mineral‐associated soil C in both soils. This challenges the common assumption that anoxia inherently protects soil C and illustrates the vulnerability of mineral‐associated C under anaerobic events characteristic of a warmer and wetter future climate. |
领域 | 气候变化 ; 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/248952 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Wenjuan Huang,Chenglong Ye,William C. Hockaday,等. Trade‐offs in soil carbon protection mechanisms under aerobic and anaerobic conditions[J]. Global Change Biology,2020. |
APA | Wenjuan Huang,Chenglong Ye,William C. Hockaday,&Steven J. Hall.(2020).Trade‐offs in soil carbon protection mechanisms under aerobic and anaerobic conditions.Global Change Biology. |
MLA | Wenjuan Huang,et al."Trade‐offs in soil carbon protection mechanisms under aerobic and anaerobic conditions".Global Change Biology (2020). |
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