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Soil Science Society of America Journal Abstract - Wetland Soils

Comparison of Soil Organic Carbon Dynamics in Forested Riparian Wetlands and Adjacent Uplands

 

This article in SSSAJ

  1. Vol. 78 No. 5, p. 1817-1827
     
    Received: Jan 26, 2014
    Published: August 29, 2014


    * Corresponding author(s): mstolt@uri.edu
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doi:10.2136/sssaj2014.01.0036
  1. Matthew C. Rickera,
  2. Mark H. Stolt *b and
  3. Michael S. Zavadac
  1. a Dep. of Environmental, Geographical, and Geological Sciences Bloomsburg Univ. of Pennsylvania 130 Hartline Science Center Bloomsburg, PA 17815
    b Dep. of Natural Resources Science Univ. of Rhode Island, 1 Greenhouse Rd. Kingston, RI 02881
    c College of Arts & Sciences Seton Hall Univ. South Orange, NJ 07079

Abstract

Wetland riparian soils typically have greater C pools than adjacent uplands, yet quantifying soil organic C (SOC) sequestration in riparian systems remains difficult. Quantification of major inputs and losses of autochthonous SOC through process-based measurements would allow for better comparisons between riparian and upland systems. In this study, we quantified major soil C fluxes within five paired headwater riparian and upland sites in Rhode Island. The difference between total C inputs and losses were used to construct net annual landscape-scale SOC sequestration rates. Annual SOC inputs were statistically similar between landscapes, with the exception of those from understory herbaceous vegetation, which were significantly greater (p < 0.001) in riparian zones than uplands. Mean annual C losses via soil respiration were also statistically similar between landscapes, but estimates of microbial respiration (actual loss of SOC) were significantly less (p < 0.01) in riparian ecosystems. Thus, riparian forests had greater net annual SOC sequestration (range 2.4–3.4 Mg C ha−1 yr−1) than paired upland sites (range 0.4–2.1 Mg C ha−1 yr−1). Our results suggest that process-based SOC sequestration measures can yield similar results to traditional methods, such as chronosequences, but our averaged estimates (2.0 Mg C ha−1 yr−1) were greater than those typically reported using alternate approaches.

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Copyright © 2014. Copyright © by the Soil Science Society of America, Inc.