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Chronic nitrogen enrichment decreases soil gross nitrogen mineralization by acidification in topsoil but by carbon limitation in subsoil

文献类型：期刊论文

作者Song, Lei1,2; Wang, Jinsong1,2; Pan, Junxiao1,2; Yan, Yingjie1,2; Niu, Shuli1,2,3
刊名GEODERMA
出版日期2022-12-15
卷号428页码:9
ISSN号0016-7061
关键词Chronic nitrogen deposition gradient Soil nitrogen mineralization Gross rate Deep soil Grassland Carbon limitation
DOI10.1016/j.geoderma.2022.116159
通讯作者Niu, Shuli(sniu@igsnrr.ac.cn)
英文摘要Continuously increasing nitrogen (N) deposition alters soil N mineralization, which is of vital importance in regulating soil N availability and satisfying plant N demands. Neither the response pattern of soil N minerali-zation to the chronic N enrichment nor the related mechanism has been well studied, particularly in deep soils. In this study, we measured the gross N mineralization rate (GNMR) as well as the corresponding soil abiotic and biotic properties along a chronic N addition gradient (7 years) at different soil depths in an alpine meadow. The results showed that GNMR was negatively correlated with the N addition rate and soil available NO3- content at each soil depth (P < 0.05). GNMR was positively correlated with soil pH, which was significantly decreased by N addition in the topsoil (0-10 cm, P < 0.05), but GNMR was not related to pH in the subsoil (10-20 or 20-40 cm). Instead, it was positively correlated with the soil carbon/nitrogen ratio (C/N), which was significantly decreased by N addition in subsoil (P < 0.05). Soil pH and C/N mainly explained the decreased GNMR with N enrichment in the topsoil and subsoil, respectively, and the contribution of the soil C/N to the decreased GNMR at the 20-40-cm soil depth was larger than that at the 10-20-cm soil depth. The results demonstrated that acidification, increased N availability, and C limitation all decreased soil N mineralization under chronic N deposition, but acidification dominated the decrease in the topsoil, while C limitation dominated the decrease in the subsoil. These findings extend our understanding of the response pattern and mechanism of soil N mineralization with chronic N enrichment at different soil depths. The diverse mechanisms underlying soil N mineralization in response to chronically increasing N deposition at different soil depths should be considered when predicting soil N mineralization in the context of global change.
WOS关键词MICROBIAL BIOMASS ; TEMPERATE FOREST ; DEPOSITION ; PH ; RESPONSES ; ECOSYSTEM ; FLUXES ; TRANSFORMATIONS ; MICROORGANISMS ; SEQUESTRATION
资助项目Second Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0302] ; National Natural Science Foundation of China[31988102] ; International Partnership Program of Chinese Academy of Sciences[121311KYSB20170004]
WOS研究方向Agriculture
语种英语
出版者ELSEVIER
WOS记录号WOS:000887169200004
资助机构Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences
源URL[http://ir.igsnrr.ac.cn/handle/311030/187377]  
专题中国科学院地理科学与资源研究所
通讯作者Niu, Shuli
作者单位1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Song, Lei,Wang, Jinsong,Pan, Junxiao,et al. Chronic nitrogen enrichment decreases soil gross nitrogen mineralization by acidification in topsoil but by carbon limitation in subsoil[J]. GEODERMA,2022,428:9.
APA Song, Lei,Wang, Jinsong,Pan, Junxiao,Yan, Yingjie,&Niu, Shuli.(2022).Chronic nitrogen enrichment decreases soil gross nitrogen mineralization by acidification in topsoil but by carbon limitation in subsoil.GEODERMA,428,9.
MLA Song, Lei,et al."Chronic nitrogen enrichment decreases soil gross nitrogen mineralization by acidification in topsoil but by carbon limitation in subsoil".GEODERMA 428(2022):9.

入库方式： OAI收割

来源：地理科学与资源研究所

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