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 |
DOI | 10.1016/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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