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Effect of continued nitrogen enrichment on greenhouse gas emissions from a wetland ecosystem in the Sanjiang Plain, Northeast China: A 5 year nitrogen addition experiment


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dc.creatorSong, Changchun
dc.creatorWang, Lili
dc.creatorTian, Hanqin
dc.creatorLiu, Deyan
dc.creatorLu, Chaoqun
dc.creatorXu, Xiaofeng
dc.creatorZhang, Lihua
dc.creatorYang, Guisheng
dc.creatorWan, Zhongmei
dc.date.accessioned2023-01-25T19:42:41Z
dc.date.available2023-01-25T19:42:41Z
dc.date.created2013
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrg.20063en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50489
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-557
dc.description.abstractMounting evidence supports that wetland ecosystems, one of the largest carbon pools on the earth, are exposed to ample nitrogen (N) additions due to atmospheric deposition or N loading from upstream agricultural fertilizer application. However, our understanding of how N enrichment affects the fluxes of greenhouse gases (GHGs) in wetlands is weak. A 5year N addition experiment was conducted to examine the responses of CH4 and N2O fluxes as well as ecosystem respiration from wetlands in the Sanjiang Plain, Northeast China, through 2005 to 2009. Four levels of N addition (control, 0kgN ha(-1)yr(-1); low-level, 60kgN ha(-1)yr(-1); medium-level, 120kgN ha(-1)yr(-1); high-level, 240kgN ha(-1)yr(-1)) were designed in this study. Overall, our results show that medium and high levels of N addition increased ecosystem respiration by 28% and 69% (P<0.05), respectively, while low-level N addition has no effect on ecosystem respiration (P>0.05). High-level N fertilization exerted stronger effects on ecosystem respiration in the initial year than the following years. It indicated that the effects of high-level N fertilization on CO2 might be overestimated by short-term observations. High-level N fertilization increased N2O emissions by 396% over the 5years (P<0.05), but the low- and medium-level-N addition did not exert any apparent effect on N2O emissions (P>0.05). N2O emission under high-level N addition in the first and fifth years showed stronger pronounced responses to N addition compared with that from the third and fourth years, indicating the importance of long-term field observation. Over the 5years, however, the low and medium-level N addition showed no effect on N2O emissions. The four levels of N addition exerted no effect on CH4 emissions (P>0.05). Furthermore, the relationship between GHGs and soil temperature or water table depth varied among different plots and experimental time. Our findings highlighted the importance of gas species, experimental time, and the amount of fertilizer N with regard to the responses of GHG emissions to N fertilization.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCESen_US
dc.relation.ispartofseries2169-8953en_US
dc.rights©American Geophysical Union 2015. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Song, Changchun, et al. "Effect of continued nitrogen enrichment on greenhouse gas emissions from a wetland ecosystem in the Sanjiang Plain, Northeast China: A 5 year nitrogen addition experiment." Journal of Geophysical Research: Biogeosciences 118.2 (2013): 741-751.en_US
dc.titleEffect of continued nitrogen enrichment on greenhouse gas emissions from a wetland ecosystem in the Sanjiang Plain, Northeast China: A 5 year nitrogen addition experimenten_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume118en_US
dc.citation.issue2en_US
dc.citation.spage741en_US
dc.citation.epage751en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-6553-6514en_US
dc.creator.orcid0000-0002-1806-4091en_US
dc.creator.orcid0000-0002-1526-0513en_US
dc.creator.orcid0000-0002-6553-6514en_US
dc.creator.orcid0000-0002-1526-0513en_US

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