Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15540 |
No evidence for increased loss of old carbon in a temperate organic soil after 13 years of simulated climatic warming despite increased CO2 emissions | |
Maria J. I. Briones; Mark H. Garnett; Phil Ineson | |
2021-02-11 | |
发表期刊 | Global Change Biology
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出版年 | 2021 |
英文摘要 | Determining the temperature sensitivity of terrestrial carbon (C) stores is an urgent priority for predicting future climate feedbacks. A key aspect to solve this long‐standing research gap is to determine whether warmer temperatures will increase autotrophic activities leading to greater C storage or promote heterotrophic activities that will drive these systems to become C sources. We experimentally addressed this critical question by subjecting intact plant‐soil systems in a UK upland ecosystem to simulated climate warming under natural field conditions. We report the results of a 13‐year field‐based climate manipulation experiment combining in situ respiration measurements with radiocarbon (14C) analyses of respired CO2, dissolved organic carbon (DOC), soil and the tissue contents of the dominant soil fauna (enchytraeids). We found that warming during the growing season produced the largely expected increases in ecosystem respiration (63%) and leaching of DOC (19%) with no evidence for thermal acclimation or substrate exhaustion over the whole 13‐year experimental period. Contrary to expectations, we found no evidence to support an increased release of old soil C after more than a decade of simulated climatic change, and indeed, 14C analyses indicated that warming caused a significant shift towards mineralisation of more recent plant‐derived C inputs. Further support came from the radiocarbon analyses of the enchytraeid tissues, which showed a greater assimilation of the more recent (plant‐derived) C sources following warming. Therefore, in contrast to subarctic ecosystems, our results suggest that changes in C storage in this UK upland soil are strongly coupled to plant activities and that increasing temperatures will drive the turnover of organic material fixed only within recent years, without resulting in the loss of existing old carbon stores. |
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/313765 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Maria J. I. Briones,Mark H. Garnett,Phil Ineson. No evidence for increased loss of old carbon in a temperate organic soil after 13 years of simulated climatic warming despite increased CO2 emissions[J]. Global Change Biology,2021. |
APA | Maria J. I. Briones,Mark H. Garnett,&Phil Ineson.(2021).No evidence for increased loss of old carbon in a temperate organic soil after 13 years of simulated climatic warming despite increased CO2 emissions.Global Change Biology. |
MLA | Maria J. I. Briones,et al."No evidence for increased loss of old carbon in a temperate organic soil after 13 years of simulated climatic warming despite increased CO2 emissions".Global Change Biology (2021). |
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