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

CCPortal

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	00128252
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.
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
语种	英语
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/203667
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).