globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2019.103033
论文题名:
Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons
作者: Cheng Y.; Wang J.; Wang J.; Wang S.; Chang S.X.; Cai Z.; Zhang J.; Niu S.; Hu S.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 201
语种: 英语
中文关键词: Gross mineralization ; Gross NH4 + and NO3 ¯ immobilization ; Gross nitrification ; Microbial biomass ; Net N mineralization ; Nitrogen deposition
英文关键词: biomass ; deposition ; forest soil ; immobilization ; mineralization ; nitrification ; organic nitrogen ; soil nitrogen ; transformation
英文摘要: Reactive nitrogen (N) input can profoundly alter soil N transformations and long-term productivity of forest ecosystems. However, critical knowledge gaps exist in our understanding of N deposition effects on internal soil N cycling in forest ecosystems. It is well established that N addition enhances soil N availability based on traditional net mineralization rate assays. Yet, experimental additions of inorganic N to soils broadly show a suppression of microbial activity and protein depolymerization. Here we show, from a global meta-analysis of 15N-labelled studies that gross N transformation rates in forest soil organic and mineral horizons differentially respond to N addition. In carbon (C)-rich organic horizons, N addition significantly enhanced soil gross rates of N mineralization, nitrification and microbial NO3 ¯ immobilization rates, but decreased gross microbial NH4 + immobilization rates. In C-poor mineral soils, in contrast, N addition did not change gross N transformation rates except for increasing gross nitrification rates. An initial soil C/N threshold of approx. 14.6, above which N addition enhanced gross N mineralization rates, could explain why gross N mineralization was increased by N deposition in organic horizons alone. Enhancement of gross N mineralization by N deposition was also largely attributed to enhanced N mineralization activity per unit microbial biomass. Our results indicate that the net effect of N input on forest soil gross N transformations are highly stratified by soil C distribution along the soil profile, and thus challenge the perception that N availability ubiquitously limits N mineralization. These findings suggest that these differences should be integrated into models to better predict forest ecosystem N cycle and C sequestration potential under future N deposition scenarios. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166037
Appears in Collections:气候变化与战略

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作者单位: School of Geography, Nanjing Normal University, Nanjing, 210023, China; College of Forestry, Nanjing Forestry University, Nanjing, 210037, China; School of the Environment, Natural Resources and Geography, Bangor UniversityGwynedd LL57 2UW, United Kingdom; State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; Department of Renewable Resources, University of Alberta, 442 Earth Sciences Building, Edmonton, T6G 2E3, Canada; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China; State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing, 210023, China; Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing, 210023, China; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC 27695, United States; College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China

Recommended Citation:
Cheng Y.,Wang J.,Wang J.,et al. Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons[J]. Earth Science Reviews,2020-01-01,201
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