气候变化领域集成服务门户(CCPortal): Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons

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DOI	10.1016/j.earscirev.2019.103033
	Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons
	Cheng Y.; Wang J.; Wang J.; Wang S.; Chang S.X.; Cai Z.; Zhang J.; Niu S.; Hu S.
发表日期	2020
ISSN	0012-8817
卷号	201
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.
英文关键词	Gross mineralization; Gross NH4 + and NO3 ¯ immobilization; Gross nitrification; Microbial biomass; Net N mineralization; Nitrogen deposition
语种	英语
scopus关键词	biomass; deposition; forest soil; immobilization; mineralization; nitrification; organic nitrogen; soil nitrogen; transformation
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209746
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 N...
推荐引用方式 GB/T 7714	Cheng Y.,Wang J.,Wang J.,et al. Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons[J],2020,201.
APA	Cheng Y..,Wang J..,Wang J..,Wang S..,Chang S.X..,...&Hu S..(2020).Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons.EARTH-SCIENCE REVIEWS,201.
MLA	Cheng Y.,et al."Nitrogen deposition differentially affects soil gross nitrogen transformations in organic and mineral horizons".EARTH-SCIENCE REVIEWS 201(2020).