Document Type
Article
Publication Title
Ecosystems
Publisher
Springer Verlag
Rights and Access Note
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s).
Publication Date
12-2014
Publisher location
Berlin, Germany
First Page
1455
Last Page
1468
Issue Number
8
Volume Number
17
Abstract/ Summary
Quantifying spatial and temporal heterogeneity in ecosystem processes presents a challenge for conserving ecosystem function across landscapes. In particular, many ecosystems contain small features that play larger roles in ecosystem processes than their size would indicate; thus, they may represent ‘‘hotspots’’ of activity relative to their surroundings. Biogeochemical hotspots are characterized as small features within a landscape that show comparatively high chemical reaction rates. In northeastern forests in North America, vernal pools are abundant, small features that typically fill in spring with snow melt and precipitation and dry by the end of summer. Ephemeral flooding alters soil moisture and the depth of the soil’s oxic/anoxic boundary, which may affect biogeochemical processes. We studied the effects of vernal pools on leaf-litter decomposition rates, soil enzyme activity, and denitrification in vernal pools to assess whether they function as biogeochemical hotspots. Our results indicate that seasonal inundation enhanced leaf-litter decomposition, denitrification, and enzyme activity in vernal pools relative to adjacent forest sites. Leaves in seasonally flooded areas decomposed faster than leaves in terra firme forest sites. Flooding also influenced the C, N, and P stoichiometry of decomposing leaf litter and explained the variance in microbial extracellular enzyme activity for phosphatase, β-D- glucosidase, and β-N-acetylglucosaminidase. Additionally, denitrification rates were enhanced by seasonal flooding across all of the study pools. Collectively, these data suggest that vernal pool eco- systems may function as hotspots of leaf-litter decomposition and denitrification and play a significant role in decomposition and nutrient dynamics relative to their size.
Repository Citation
Capps, Krista A.; Rancatti, Regina L.; Tomczyk, Nathan; Calhoun, Aram J K; and Hunter Jr., Malcolm L., "Biogeochemical hotspots in Forested Landscapes: The Role of Vernal Pools in Denitrification and Organic Matter" (2014). Publications. 30.
https://digitalcommons.library.umaine.edu/mitchellcenter_pubs/30
Citation/Publisher Attribution
Capps, K.A., Rancatti, R., Tomczyk, N., Parr, T., Calhoun, A., & Hunter, M.L. Jr. 2014. Biogeochemical hotspots in forested landscapes: The role of vernal pools in denitrification and organic matter processing. Ecosystems. Volume 17, Issue 8, pp 1455-1468
Publisher Statement
© 2014 Springer Science+Business Media New York
DOI
DOI: 10.1007/s10021-014-9807-z
Version
post-print (i.e. final draft post-refereeing with all author corrections and edits)
Included in
Biodiversity Commons, Biology Commons, Forest Biology Commons, Terrestrial and Aquatic Ecology Commons