Soil Nitrogen Transformations Respond Diversely to Multiple Levels of Nitrogen Addition in a Tibetan Alpine Steppe
文献类型：期刊论文
| 作者 | Mao, Chao1; Kou, Dan; Peng, Yunfeng; Qin, Shuqi1; Zhang, Qiwen; Yang, Yuanhe1
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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| 出版日期 | 2021 |
| 卷号 | 126期号:5 |
| 关键词 | gross nitrification gross nitrogen mineralization microbial immobilization nitrogen cycling nitrogen input |
| ISSN号 | 2169-8953 |
| DOI | 10.1029/2020JG006211 |
| 文献子类 | Article |
| 英文摘要 | Elevated reactive nitrogen (N) input could modify soil N transformations, regulating ecosystem functions such as soil N retention and loss. Although multiple hypotheses advocate nonlinear variations in soil N transformations with continuous N input, there still lacks empirical evidences for the responses of soil N transformations to multiple N additions. Here, based on a manipulative N addition experiment and a N-15 pool dilution approach, we explored changes in soil gross N transformations with eight N addition levels and associated mechanisms in a Tibetan alpine steppe. Our results showed that soil gross N mineralization rate (GNM) increased first and then stabilized with increasing N additions. Meanwhile, soil microbial immobilization rate (MIM) exhibited an initially increased and subsequently declined pattern under various N addition levels. In contrast, soil gross nitrification rate (GN) increased linearly across multiple N addition levels. Our results also revealed that variations in GNM were mainly regulated by aboveground vegetation N pool-induced changes in dissolved organic N content along the N addition gradient. Meanwhile, changes in GN were dominantly modified by soil pH-induced variations in ammonia-oxidizing archaea abundance across multiple N addition levels. Additionally, alterations in MIM under various N input levels were primarily controlled by microbial biomass which was regulated by dissolved organic carbon content under low N input and NH4+-N content at high N level, respectively. Overall, patterns and drivers of soil N transformations observed in this study provide valuable benchmark for Earth system models to better predict ecosystem N dynamics under global N-enrichment scenarios. |
| 学科主题 | Environmental Sciences ; Geosciences, Multidisciplinary |
| 出版地 | WASHINGTON |
| 电子版国际标准刊号 | 2169-8961 |
| WOS关键词 | AMMONIA-OXIDIZING ARCHAEA ; TERRESTRIAL ECOSYSTEMS ; MICROBIAL BIOMASS ; FOREST SOILS ; SATURATION ; CARBON ; NITRIFICATION ; DEPOSITION ; MODEL ; CYCLE |
| WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
| 语种 | 英语 |
| WOS记录号 | WOS:000655232300002 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Natural Science Foundation of China [31825006, 31988102, 91837312] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program [2019QZKK0106] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SMC049] |
| 源URL | [http://ir.ibcas.ac.cn/handle/2S10CLM1/26790]  |
| 专题 | 植被与环境变化国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mao, Chao,Kou, Dan,Peng, Yunfeng,et al. Soil Nitrogen Transformations Respond Diversely to Multiple Levels of Nitrogen Addition in a Tibetan Alpine Steppe[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2021,126(5). |
| APA | Mao, Chao,Kou, Dan,Peng, Yunfeng,Qin, Shuqi,Zhang, Qiwen,&Yang, Yuanhe.(2021).Soil Nitrogen Transformations Respond Diversely to Multiple Levels of Nitrogen Addition in a Tibetan Alpine Steppe.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,126(5). |
| MLA | Mao, Chao,et al."Soil Nitrogen Transformations Respond Diversely to Multiple Levels of Nitrogen Addition in a Tibetan Alpine Steppe".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 126.5(2021). |
入库方式： OAI收割
来源：植物研究所
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