| Autor: |
Siyi Liu, Chuanhong Li, Lin Zhang, Yi Cheng, Zhiming Zhang, Fang He, Baomin Yao, Lili Han, Yuan Ge, Baodong Chen, Guoxin Sun, Congcong Shen, Limei Zhang |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Ecosystem Health and Sustainability, Vol 10 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2332-8878 |
| DOI: |
10.34133/ehs.0231 |
| Popis: |
Alpine forest soil in the southeastern Qinghai–Xizang Plateau plays a crucial role in regional and global climate and biogeochemical cycles, yet the elevational distribution of soil nitrogen (N) availability and losing risk is unresolved. In this study, we characterized soil N composition and key N transformation processes across different elevations in 3 typical mounts of the Qinghai–Xizang Plateau. In contrast to previous suggestions, soil total N and ammonium are found to accumulate in high elevation zones. This accumulation of N at higher altitudes is due to a consistent soil net N mineralization rate coupled with an extremely low net nitrification rate, which is suppressed by low pH and high soil moisture in high elevation zones. Moreover, the elevated rates of biological N fixation along the elevation further contribute to N accumulation in high elevation regions in which the acid-tolerant Bradyrhizobium, plant-associated Herbaspirillum, and Klebsiella are identified as the key diazotrophic microbial taxa responsible for active N fixation. Collectively, our results suggest that total N and NH4+-N accumulation in higher altitude zone is a ubiquitous phenomenon in the southeast Qinghai–Xizang Plateau, with lower nitrification rates and higher biological nitrogen fixation being key processes enabling this occurrence. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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