Nonlinear responses of soil nitrous oxide emission to multi-level nitrogen enrichment in a temperate needle-broadleaved mixed forest in Northeast China
Cheng, SL; Wang, L; Fang, HJ; Yu, GR; Yang, XM; Li, XY; Si, GY; Geng, J; He, S; Yu, GX
2016
Source PublicationCATENA
ISSN0341-8162
Volume147Pages:556-563
AbstractThe responses of nitrous oxide (N2O) emission from forest soils to increasing atmospheric nitrogen (N) deposition are controversial. In this study, our objectives were to explore the response curves of soil N2O flux to multilevel N inputs, as well as to examine the key factors dominating the changes in soil N2O emission caused by N enrichment in the temperate needle-broadleaved mixed forest, Northeast China. The study consists of nine levels of urea addition (0,10, 20, 40, 60, 80, 100, 120, 140 kg N ha(-1) yr(-1)) with 4 replicates for each treatment. Soil N2O fluxes were monitored weekly using the static chamber and gas chromatograph technique. NH4+-NO3-,-N, total dissolved N (TDN), dissolved organic N (DON), and auxiliary variables (soil temperate and moisture in 0-10 cm depth) were measured at the same frequency to examine the regulation of soil N2O flux. The results showed that high rates of urea inputs (>60 kg N ha(-1) yr(-1)) significantly increased soil NO3--N concentrations in litter layer and mineral layer (0-10 cm depth) by 120-180% and 56.4-84.6%, respectively. Soil N2O flux increased exponentially with increase in the rates of urea addition by 194% to 334% for the 60 to 140 kg N ha(-1) yr(-1) treatments relative to the control. The critical level of N input for the significant alternation of soil N accumulation and N2O emission was approximately 70 kg N ha(-1) yr(-1). The changes in soil N2O flux elicited by. N addition were positively related to those of soil NOT and soil moisture contents. These results suggest that exogenous N input at the rate below the critical load will not significantly promote soil N2O emission over the short term, which is favorable to carbon sequestration of the temperate needle-broadleaved mixed forest, Northeast China. (C) 2016 Elsevier B.V. All rights reserved.
SubtypeJournal
KeywordAtmospheric N deposition Soil N2O flux Soil dissolved N Nonlinear responses Temperate needle-broadleaved mixed forest
Subject AreaGeology ; Agriculture ; Water Resources
WOS Subject ExtendedGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS KeywordFERTILIZER NITROGEN ; TERRESTRIAL ECOSYSTEMS ; CROPPING SYSTEM ; N2O EMISSION ; DEPOSITION ; CARBON ; FLUXES ; METAANALYSIS ; INPUT ; CYCLE
Indexed BySCI
Language英语
WOS IDWOS:000385598800054
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44153
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Cheng, SL,Wang, L,Fang, HJ,et al. Nonlinear responses of soil nitrous oxide emission to multi-level nitrogen enrichment in a temperate needle-broadleaved mixed forest in Northeast China[J]. CATENA,2016,147:556-563.
APA Cheng, SL.,Wang, L.,Fang, HJ.,Yu, GR.,Yang, XM.,...&Yu, GX.(2016).Nonlinear responses of soil nitrous oxide emission to multi-level nitrogen enrichment in a temperate needle-broadleaved mixed forest in Northeast China.CATENA,147,556-563.
MLA Cheng, SL,et al."Nonlinear responses of soil nitrous oxide emission to multi-level nitrogen enrichment in a temperate needle-broadleaved mixed forest in Northeast China".CATENA 147(2016):556-563.
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