Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13793 |
Modelling the dynamic physical protection of soil organic carbon: Insights into carbon predictions and explanation of the priming effect | |
Luo, Zhongkui1; Baldock, Jeff2; Wang, Enli1 | |
2017-12-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | The role and significance of physically protected soil organic carbon (SOC) in regulating SOC dynamics remains unclear. Here, we developed a simple theoretical model (DP model) considering dynamic physical protection to simulate the dynamics of protected (C-p) and unprotected SOC (C-u), and compared the modelling results with a conventional two-pool (fast vs. slow) model considering chemical recalcitrance. The two models were first constrained using extensive SOC data collected from soils with and without fresh carbon (C) inputs under incubation conditions, and then applied to project SOC dynamics and explore mechanisms underpinning the priming effect (PE). Overall, both models explained more than 99% of the variances in observed SOC dynamics. The DP model predicted that C-p accounted for the majority of total SOC. As decomposition proceeds, the proportion of C-p reached >90% and kept relatively constant. Although the similar performance of the two models in simulating observed total SOC dynamics, their predictions of future SOC dynamics were divergent, challenging the predictions of widely used pool-based models. The DP model also suggested alternative mechanisms underpinning the priming of SOC decomposition by fresh C inputs. The two-pool model suggested that the PE was caused by the stimulated decomposition rates, especially for the slow recalcitrant pool, while the DP model suggested that the PE might be the combined consequence of stimulated C-u decomposition, the liberation of C-p to decomposition and the inhibition of the protection of unprotected SOC. The model-data integration provided a new explanation for the PE, highlighting the importance of liberation of initially physically protected SOC to decomposition by new C inputs. Our model-data integration demonstrated the importance of simulating physical protection processes for reliable SOC predictions, and provided new insights into mechanistic understanding of the priming effect. |
英文关键词 | accessibility vs recalcitrance carbon models carbon pools physical protection priming effect soil carbon stability |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414969000027 |
WOS关键词 | TEMPERATURE SENSITIVITY ; LITTER DECOMPOSITION ; MICROBIAL EFFICIENCY ; MATTER DECOMPOSITION ; STABILIZATION ; MECHANISMS ; FRAMEWORK ; TURNOVER ; NITROGEN ; IMPACTS |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
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/17523 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.CSIRO Agr & Food, Canberra, ACT, Australia; 2.CSIRO Agr & Food, Glen Osmond, SA, Australia |
推荐引用方式 GB/T 7714 | Luo, Zhongkui,Baldock, Jeff,Wang, Enli. Modelling the dynamic physical protection of soil organic carbon: Insights into carbon predictions and explanation of the priming effect[J]. GLOBAL CHANGE BIOLOGY,2017,23(12). |
APA | Luo, Zhongkui,Baldock, Jeff,&Wang, Enli.(2017).Modelling the dynamic physical protection of soil organic carbon: Insights into carbon predictions and explanation of the priming effect.GLOBAL CHANGE BIOLOGY,23(12). |
MLA | Luo, Zhongkui,et al."Modelling the dynamic physical protection of soil organic carbon: Insights into carbon predictions and explanation of the priming effect".GLOBAL CHANGE BIOLOGY 23.12(2017). |
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