Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15205 |
Permafrost nitrogen status and its determinants on the Tibetan Plateau | |
Chao Mao; Dan Kou; Leiyi Chen; Shuqi Qin; Dianye Zhang; Yunfeng Peng; Yuanhe Yang | |
2020-07-01 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
英文摘要 | It had been suggested that permafrost thaw could promote frozen nitrogen (N) release and modify microbial N transformation rates, which might alter soil N availability and then regulate ecosystem functions. However, the current understanding of this issue is confined to limited observations in the Arctic permafrost region, without any systematic measurements in other permafrost regions. Based on a large‐scale field investigation along a 1,000 km transect and a laboratory incubation experiment with a 15N pool dilution approach, this study provides the comprehensive evaluation of the permafrost N status, including the available N content and related N transformation rates, across the Tibetan alpine permafrost region. In contrast to the prevailing view, our results showed that the Tibetan alpine permafrost had lower available N content and net N mineralization rate than the active layer. Moreover, the permafrost had lower gross rates of N mineralization, microbial immobilization and nitrification than the active layer. Our results also revealed that the dominant drivers of the gross N mineralization and microbial immobilization rates differed between the permafrost and the active layer, with these rates being determined by microbial properties in the permafrost while regulated by soil moisture in the active layer. In contrast, soil gross nitrification rate was consistently modulated by the soil content in both the permafrost and the active layer. Overall, patterns and drivers of permafrost N pools and transformation rates observed in this study offer new insights into the potential N release upon permafrost thaw and provide important clues for Earth system models to better predict permafrost biogeochemical cycles under a warming 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/281747 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Chao Mao,Dan Kou,Leiyi Chen,et al. Permafrost nitrogen status and its determinants on the Tibetan Plateau[J]. Global Change Biology,2020. |
APA | Chao Mao.,Dan Kou.,Leiyi Chen.,Shuqi Qin.,Dianye Zhang.,...&Yuanhe Yang.(2020).Permafrost nitrogen status and its determinants on the Tibetan Plateau.Global Change Biology. |
MLA | Chao Mao,et al."Permafrost nitrogen status and its determinants on the Tibetan Plateau".Global Change Biology (2020). |
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