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.author | Hargreaves, Sarah K. | |
| dc.contributor.author | Horrigan, Emma J. | |
| dc.contributor.author | Jefferies, Robert L. | |
| dc.date.accessioned | 2012-12-29T03:58:09Z | |
| dc.date.available | 2012-12-29T03:58:09Z | |
| dc.date.issued | 2009 | |
| dc.description.abstract | Seasonal 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.citation | Plant Soil 322 (2009) :279–291 | |
| dc.identifier.uri | http://hdl.handle.net/10315/20472 | |
| dc.language.iso | en | en |
| dc.publisher | Springer Verlag | |
| dc.rights.article | http://rd.springer.com/article/10.1007/s11104-009-9915-2 | |
| dc.rights.journal | http://www.springer.com/life+sciences/plant+sciences/journal/11104 | en_US |
| dc.rights.publisher | www.springerlink.com | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ | * |
| dc.subject | microbial carbon | |
| dc.subject | plant carbon | |
| dc.subject | microbial and plant carbon | |
| dc.subject | nitrogen | |
| dc.subject | phosphorus | |
| dc.subject | seasonal biomass changes | |
| dc.subject | biomass | |
| dc.subject | fertilizer | |
| dc.subject | fertilizer addition | |
| dc.subject | Puccinellia phryganodes | |
| dc.subject | Lesser snow geese | |
| dc.subject | Lesser snow goose | |
| dc.subject | Grazing | |
| dc.subject | Hudson Bay coast | |
| dc.subject | Hudson Bay | |
| dc.title | Seasonal partitioning of resource use and constraints on the growth of soil microbes and a forage grass in a grazed Arctic salt-marsh | |
| dc.type | Article |