Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.16005 |
Unexpected high retention of 15N-labeled nitrogen in a tropical legume forest under long-term nitrogen enrichment | |
Jinhua Mao; Qinggong Mao; Per Gundersen; Geshere A. Gurmesa; Wei Zhang; Juan Huang; Senhao Wang; Andi Li; Yufang Wang; Yabing Guo; Rongzhen Liu; Jiangming Mo; Mianhai Zheng | |
2021-11-28 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | The responses of forests to nitrogen (N) deposition largely depend on the fates of deposited N within the ecosystem. Nitrogen-fixing legume trees widely occur in terrestrial forests, but the fates of deposited N in legume-dominated forests remain unclear, which limit a global evaluation of N deposition impacts and feedbacks on carbon sequestration. Here, we performed the first ecosystem-scale 15N labeling experiment in a typical legume-dominated forest as well as in a nearby non-legume forest to determine the fates of N deposition between two different forest types and to explore their underlying mechanisms. The 15N was sprayed bimonthly for 1 year to the forest floor in control and N addition (50 kg N ha−1 year−1 for 10 years) plots in both forests. We unexpectedly found a strong capacity of the legume forest to retain deposited N, with 75 ± 5% labeled N recovered in plants and soils, which was higher than that in the non-legume forest (56 ± 4%). The higher 15N recovery in legume forest was mainly driven by uptake by the legume trees, in which 15N recovery was approximately 15% more than that in the nearby non-legume trees. This indicates higher N-demand by the legume than non-legume trees. Mineral soil was the major sink for deposited N, with 39 ± 4% and 34 ± 3% labeled N retained in the legume and non-legume forests, respectively. Moreover, N addition did not significantly change the 15N recovery patterns of both forests. Overall, these findings indicate that legume-dominated forests act as a strong sink for deposited N regardless of high soil N availability under long-term atmospheric N deposition, which suggest a necessity to incorporate legume-dominated forests into N-cycling models of Earth systems to improve the understanding and prediction of terrestrial N budgets and the global N deposition effects. |
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/342354 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Jinhua Mao,Qinggong Mao,Per Gundersen,et al. Unexpected high retention of 15N-labeled nitrogen in a tropical legume forest under long-term nitrogen enrichment[J]. Global Change Biology,2021. |
APA | Jinhua Mao.,Qinggong Mao.,Per Gundersen.,Geshere A. Gurmesa.,Wei Zhang.,...&Mianhai Zheng.(2021).Unexpected high retention of 15N-labeled nitrogen in a tropical legume forest under long-term nitrogen enrichment.Global Change Biology. |
MLA | Jinhua Mao,et al."Unexpected high retention of 15N-labeled nitrogen in a tropical legume forest under long-term nitrogen enrichment".Global Change Biology (2021). |
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