Seasonal partitioning of resource use and constraints on the growth of soil microbes and a forage grass in a grazed Arctic salt-marsh

dc.contributor.authorHargreaves, Sarah K.
dc.contributor.authorHorrigan, Emma J.
dc.contributor.authorJefferies, Robert L.
dc.date.accessioned2012-12-29T03:58:09Z
dc.date.available2012-12-29T03:58:09Z
dc.date.issued2009
dc.description.abstractSeasonal growth responses of plants and soil microorganisms to additions of nitrogen (N), phosphorus (P) and carbon (C) were examined in goose-grazed and exclosed plots in an Arctic salt marsh. Plants showed strong growth responses to N and NP additions but not to P. Nitrogen levels in the shoots and roots of Puccinellia phryganodes declined as summer progressed. Microbial biomass was low in spring in spite of N and P additions, likely due to C limitation, but values rose in autumn, independent of nutrient treatment, as dissolved organic carbon (DOC) increased. Glucose addition (C source) elicited a transitory increase in microbial biomass. Multiple plant defoliations by geese had a negative effect on microbial biomass, in spite of the presence of DOC and added N and P, possibly because hypersalinity restricted growth. Plants appear to limit soil inputs of C in summer and compete effectively for resources in contrast to autumn, indicating a temporal partitioning of resources.en_US
dc.identifier.citationPlant Soil 322 (2009) :279–291
dc.identifier.urihttp://hdl.handle.net/10315/20472
dc.language.isoenen
dc.publisherSpringer Verlag
dc.rights.articlehttp://rd.springer.com/article/10.1007/s11104-009-9915-2
dc.rights.journalhttp://www.springer.com/life+sciences/plant+sciences/journal/11104en_US
dc.rights.publisherwww.springerlink.com
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectmicrobial carbon
dc.subjectplant carbon
dc.subjectmicrobial and plant carbon
dc.subjectnitrogen
dc.subjectphosphorus
dc.subjectseasonal biomass changes
dc.subjectbiomass
dc.subjectfertilizer
dc.subjectfertilizer addition
dc.subjectPuccinellia phryganodes
dc.subjectLesser snow geese
dc.subjectLesser snow goose
dc.subjectGrazing
dc.subjectHudson Bay coast
dc.subjectHudson Bay
dc.titleSeasonal partitioning of resource use and constraints on the growth of soil microbes and a forage grass in a grazed Arctic salt-marsh
dc.typeArticle

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