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Feedbacks between nitrogen fixation and soil organic matter increase ecosystem functions in diversified agroecosystems
dc.contributor.authorBlesh, Jennifer
dc.date.accessioned2020-01-13T15:11:11Z
dc.date.availableWITHHELD_12_MONTHS
dc.date.available2020-01-13T15:11:11Z
dc.date.issued2019-12
dc.identifier.citationBlesh, Jennifer (2019). "Feedbacks between nitrogen fixation and soil organic matter increase ecosystem functions in diversified agroecosystems." Ecological Applications 29(8): n/a-n/a.
dc.identifier.issn1051-0761
dc.identifier.issn1939-5582
dc.identifier.urihttps://hdl.handle.net/2027.42/152835
dc.description.abstractNitrogen (N) losses from intensified agriculture are a major cause of global change, due to nitrate (NO3−) export and the eutrophication of aquatic systems as well as emissions of nitrous oxide (N2O) into the atmosphere. Diversified agroecosystems with legume cover crops couple N and carbon (C) inputs to soil and reduce N pollution, but there is a need to identify controls on legume N2 fixation across ecosystems with variable soil conditions. Here, I tested the hypothesis that N mineralization from turnover of soil organic matter (SOM) regulates legume N2 fixation across 10 farms that spanned a gradient of SOM levels. I separated soil samples into two SOM fractions, based on size and density, which are indicators of soil nutrient cycling and N availability (free particulate organic matter and intra‐aggregate particulate organic matter [POM]). This study indicates downregulation of legume N2 fixation in diversified agroecosystems with increasing N availability in intra‐aggregate POM and increasing N mineralization. Intercropping the legume with a grass weakened the relationship between N in POM and N2 fixation due to N assimilation by the grass. Further, mean rates of N and C mineralization across sites increased with two seasons of a legume‐grass cover crop mixture, which could enhance this stabilizing feedback between soil N availability and N2 fixation over time. These results suggest a potential mechanism for the diversity–ecosystem‐function relationships measured in long‐term studies of agroecosystems, in which regular use of legume cover crops increases total soil organic C and N and reduces negative environmental impacts of crop production.
dc.publisherWiley Periodicals, Inc.
dc.publisherSSSA Special Publication 49
dc.subject.otherparticulate organic matter
dc.subject.othersoil carbon
dc.subject.othersoil organic matter
dc.subject.otheragroecosystem
dc.subject.otherbiological nitrogen fixation
dc.subject.othercover crop
dc.subject.otherlegume
dc.subject.othermineralization
dc.titleFeedbacks between nitrogen fixation and soil organic matter increase ecosystem functions in diversified agroecosystems
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelEcology and Evolutionary Biology
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/152835/1/eap1986.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/152835/2/eap1986-sup-0001-AppendixS1.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/152835/3/eap1986_am.pdf
dc.identifier.doi10.1002/eap.1986
dc.identifier.sourceEcological Applications
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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