Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15754 |
Long-term geothermal warming reduced stocks of carbon but not nitrogen in a subarctic forest soil | |
Tino Peplau; Julia Schroeder; Edward Gregorich; Christopher Poeplau | |
2021-07-10 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Global warming is accelerating the decomposition of soil organic matter (SOM). When predicting the net SOM dynamics in response to warming, there are considerable uncertainties owing to experimental limitations. Long-term in situ whole-profile soil warming studies are particularly rare. This study used a long-term, naturally occurring geothermal gradient in Yukon, Canada, to investigate the warming effects on SOM in a forest ecosystem. Soils were sampled along this thermosequence which exhibited warming of up to 7.7℃; samples were collected to a depth of 80 cm and analysed for soil organic carbon (SOC) and nitrogen (N) content, and estimates made of SOC stock and fractions. Potential litter decomposition rates as a function of soil temperature and depth were observed for a 1-year period using buried teabags and temperature loggers. The SOC in the topsoil (0–20 cm) and subsoil (20–80 cm) responded similar to warming. A negative relationship was found between soil temperature and whole-profile SOC stocks, with a total loss of 27% between the warmest and reference plots, and a relative loss of 3%℃−1. SOC losses were restricted to the particulate organic matter (POM) and dissolved organic carbon (DOC) fractions with net whole-profile depletions. Losses in POM-C accounted for the largest share of the total SOC losses. In contrast to SOC, N was not lost from the soil as a result of warming, but was redistributed with a relatively large accumulation in the silt and clay fraction (+40%). This suggests an immobilization of N by microbes building up in mineral-associated organic matter. These results confirm that soil warming accelerates SOC turnover throughout the profile and C is lost in both the topsoil and subsoil. Since N stocks remained constant with warming, SOM stoichiometry changed considerably and this in turn could affect C cycling through changes in microbial metabolism. |
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/333708 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Tino Peplau,Julia Schroeder,Edward Gregorich,et al. Long-term geothermal warming reduced stocks of carbon but not nitrogen in a subarctic forest soil[J]. Global Change Biology,2021. |
APA | Tino Peplau,Julia Schroeder,Edward Gregorich,&Christopher Poeplau.(2021).Long-term geothermal warming reduced stocks of carbon but not nitrogen in a subarctic forest soil.Global Change Biology. |
MLA | Tino Peplau,et al."Long-term geothermal warming reduced stocks of carbon but not nitrogen in a subarctic forest soil".Global Change Biology (2021). |
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