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RESEARCH ARTICLE

Wetland soil carbon storage exceeds uplands in an urban natural area (Florida, USA)

Jennifer D. Bennett A and Lisa Chambers https://orcid.org/0000-0001-6432-8038 A *
+ Author Affiliations
- Author Affiliations

A Department of Biology, University of Central Florida, 4000 Central Florida Boulevard, Building 20, BIO 301, Orlando, FL 32816, USA.

* Correspondence to: lisa.chambers@ucf.edu

Handling Editor: Samuel Abiven

Soil Research 61(6) 542-559 https://doi.org/10.1071/SR22235
Submitted: 8 November 2022  Accepted: 28 March 2023   Published: 28 April 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Urban greenspaces and natural areas are often recognised for their cultural services, but may also provide ecological services, including carbon (C) sequestration and storage.

Aims: This study investigated the strength of the relationship between easily discernable ecosystem characteristics (e.g. topographic position, vegetation, and soil type) and soil C storage, and evaluated common conversion factors and methodologies used in soil C inventories.

Methods: Sixty-seven full-depth (up to 5 m) soil cores were collected across nine community types in University of Central Florida’s Arboretum (Orlando, Florida, USA) and were analysed for bulk density, organic matter (OM) content, total C, and total nitrogen (N).

Key results: Wetlands stored an average of 16 times more C than uplands and C density increased with soil depth. A 70% underestimation of soil C stocks would have occurred if sampling stopped at 50 cm. A strong linear relationship between soil C and OM supports the use of a 0.56 (C:OM) conversion factor for estimating soil organic C.

Conclusions: The presence of wetlands is the key predictor of soil C and N storage, but the magnitude of storage varies widely among wetlands. Overall, the 225-ha study area stored 85 482 ± 3365 Mg of soil C.

Implications: Urban natural areas should be evaluated for their ecosystem services separately from their surrounding developed land use/land cover with consideration for C storage potential. Leveraging topographic position, a site-specific soil OM conversion factor, and depth to refusal testing can increase the accuracy and cost-effectiveness of soil C inventories.

Keywords: biogeochemistry, carbon inventory, climate change, soil carbon, soil type, uplands, urbanization, wetlands.


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