Southeastern Section - 68th Annual Meeting - 2019

Paper No. 18-4
Presentation Time: 1:00 PM-5:00 PM


ALLAN, Craig1, ALLAN, Bryan1, VENKETASUBRAMANIAN, Kailas2, VINSON, David S.3, ZHENG, Minrui4, TANG, Wenwu4 and TRETTIN, Carl C.5, (1)Department of Geography and Earth Sciences, University of North Carolina Charlotte, 9201 University City Blvd, Charlotte, NC 28223, (2)Project Mosaic, UNC Charlotte, 9201 University City Blvd., Charlotte, NC 28223, (3)Department of Geography & Earth Sciences, University of North Carolina at Charlotte, 9201 University City Blvd., McEniry 324, Charlotte, NC 28223, (4)Ceanter for Applied GIScience, UNC Charlotte, 9201 University City Blvd., Charlotte, NC 28223, (5)Center for Forested Wetlands Research, USDA Forest Service, 3734 Highway 402, Cordesville, SC 29434

The environmental variables: soil temperature, water level position and soil redox were measured in conjunction with gross and microbial soil respiration rates and methane emissions along a freshwater tidal gradient in a bottomland forest from May 2015 through January 2016. Soil respiration and methane emission rates were measured with standard static chamber techniques, with chambers situated on sites representative of the hummock and hollow microtopograhy characteristic of these low gradient tidal wetlands. Wetland microtopography was found to significantly influence soil and microbial respiration rates but significant differences in these rates were not measured between similar topographic sites along the tidal gradient. Methane emissions were measured at two locations along the tidal gradient with tidally impacted hollows exhibiting significantly higher emission rates during the growing season than all other sites measured during the study. Elevated CH4 emissions in tidal hollows are hypothesized to be related to seasonal increases in soil temperature and ebullition during inter tidal periods.