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Ecosystem development after mangrove wetland creation: plant-soil change across a 20-year chronosequence

September 12, 2012

Mangrove wetland restoration and creation efforts are increasingly proposed as mechanisms to compensate for mangrove wetland losses. However, ecosystem development and functional equivalence in restored and created mangrove wetlands are poorly understood. We compared a 20-year chronosequence of created tidal wetland sites in Tampa Bay, Florida (USA) to natural reference mangrove wetlands. Across the chronosequence, our sites represent the succession from salt marsh to mangrove forest communities. Our results identify important soil and plant structural differences between the created and natural reference wetland sites; however, they also depict a positive developmental trajectory for the created wetland sites that reflects tightly coupled plant-soil development. Because upland soils and/or dredge spoils were used to create the new mangrove habitats, the soils at younger created sites and at lower depths (10-30 cm) had higher bulk densities, higher sand content, lower soil organic matter (SOM), lower total carbon (TC), and lower total nitrogen (TN) than did natural reference wetland soils. However, in the upper soil layer (0-10 cm), SOM, TC, and TN increased with created wetland site age simultaneously with mangrove forest growth. The rate of created wetland soil C accumulation was comparable to literature values for natural mangrove wetlands. Notably, the time to equivalence for the upper soil layer of created mangrove wetlands appears to be faster than for many other wetland ecosystem types. Collectively, our findings characterize the rate and trajectory of above- and below-ground changes associated with ecosystem development in created mangrove wetlands; this is valuable information for environmental managers planning to sustain existing mangrove wetlands or mitigate for mangrove wetland losses.

Citation Information

Publication Year 2012
Title Ecosystem development after mangrove wetland creation: plant-soil change across a 20-year chronosequence
DOI 10.1007/s10021-012-9551-1
Authors Michael J. Osland, Amanda C. Spivak, Janet A. Nestlerode, Jeannine M. Lessmann, Alejandro E. Almario, Paul T. Heitmuller, Marc J. Russell, Ken W. Krauss, Federico Alvarez, Darrin D. Dantin, James E. Harvey, Andrew S. From, Nicole Cormier, Camille L. Stagg
Publication Type Article
Publication Subtype Journal Article
Series Title Ecosystems
Index ID 70039865
Record Source USGS Publications Warehouse
USGS Organization National Wetlands Research Center