caa a22 4500 445891254 CHVBK 20180317145617.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10750-010-0471-9 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0471-9 Comparison of denitrification characteristics among three habitat types of a large river floodplain: Atchafalaya River Basin, Louisiana [Elektronische Daten] [Amy Scaroni, John Nyman, Charles Lindau] Mobile forms of nitrogen leach from upland environments into aquatic systems, often discharging to coastal zones. Addition of nitrogen to once N-limited systems results in a host of changes ranging from eutrophication to loss of biodiversity. Floodplains can ameliorate these changes by removing and sequestering nitrogen. In many coastal floodplains, sedimentation causes lakes to transition to baldcypress swamps, and ultimately to bottomland hardwood (BLHW) forests. These habitats differ in their contact with floodwater, which directly and indirectly affects their ability to process nutrients, but the effects of habitat change on denitrification at the floodplain scale cannot be predicted because of lack of suitable data. This study compared denitrification characteristics among the aforementioned habitats within the Atchafalaya River Basin (ARB). Microcosms were established in the laboratory, and the acetylene block technique was used to estimate four denitrification characteristics: background denitrification rates, maximum rates, time to reach maximum rates, and the linear response of denitrification to nitrate concentration. There were significant differences in denitrification characteristics among the three habitat types; specifically, all habitats differed in the time required for denitrification to respond to nitrate in the overlying water, and denitrification in lake habitats differed from both BLHWs and baldcypress swamps. Landscape-scale models should account for different linear relationships between denitrification and nitrate concentrations, and different response times to nitrate concentrations for different habitats. Because denitrification characteristics differ across habitats within the ARB, continued habitat change within the floodplain will alter nutrient discharge to coastal waters. Springer Science+Business Media B.V., 2010 Acetylene blockage technique nationallicence Eutrophication nationallicence Mississippi River nationallicence Nitrate removal nationallicence Succession nationallicence Wetlands nationallicence Scaroni Amy School of Renewable Natural Resources, Louisiana State University Agricultural Center, Louisiana State University, 70803, Baton Rouge, LA, USA aut Nyman John School of Renewable Natural Resources, Louisiana State University Agricultural Center, Louisiana State University, 70803, Baton Rouge, LA, USA aut Lindau Charles School of the Coast and Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut Hydrobiologia Springer Netherlands 658/1(2011-01-01), 17-25 0018-8158 658:1<17 2011 658 10750 https://doi.org/10.1007/s10750-010-0471-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0471-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Scaroni Amy School of Renewable Natural Resources, Louisiana State University Agricultural Center, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Nyman John School of Renewable Natural Resources, Louisiana State University Agricultural Center, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Lindau Charles School of the Coast and Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 658/1(2011-01-01), 17-25 0018-8158 658:1<17 2011 658 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer