The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA
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The Ohio State University / OhioLINK
2006
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1154448558 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu11544485582021-08-03T05:51:18Z The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA Hernandez, Maria Elizabeth Denitrification Created wetlands Nitrous oxide emissions Nitrate pollution Organic matter in wetlands The effect of hydrologic conditions on nitrogen biogeochemistry was investigated in two identical 1-ha surface-flow created riverine wetlands in Columbus, Ohio, USA. These wetlands, created in 1993-1994, are fed with water from Olentangy River. For two years (2003-2004), both wetlands experienced seasonal (winter-spring) controlled hydrologic flood pulses followed by one year (2005) in which they received a steady flow rate of water. Nitrogen gas flux measurements were made in plots distributed along a transverse gradient (edge plots and high marsh plots with alternate wet and dry conditions, and low marsh plots and open water plots with permanent flooding). Highest average N2O fluxes were observed in high marsh plots followed by edge plots, open water plots , and low marsh plots. In permanently flooded plots without vegetation, nitrous oxide fluxes were low, regardless of flood pulse conditions.N2O fluxes were higher in plots with vegetation than in plots without vegetation only when plots were inundated. Denitrification in all plots was significantly correlated with soil temperature and was significantly correlated with the nitrate concentration in the inflow surface water in the growing season in permanently flooded zones. Highest mean denitrification rates were observed in the low marsh and open water zonesfollowed by high marsh and edge zones. In permanently flooded areas, denitrification rates were significantly higher near the inflow than near the outflow. Denitrification appeared to be nitrogen limited in low marsh, high marsh and edge plots, but both carbon and nitrogen limited in open water. NO2- + NO3- mass retention was similar under pulsing and steady flow conditions. Total nitrogen (TN) retention was lower under pulsing than steady flow conditions as a result of an export of organic nitrogen occurred under pulsing conditions. Aboveground biomass productivity in the pulsing year was significantly lower than in the steady-flow flow. Belowground biomass productivities were similar in both years. Nitrogen accumulation in plants represented 54- 44% of total nitrogen removed. Denitrification accounted for 8-12 % of nitrate removed. Less than 1% of the total nitrogen removed was converted to N2O, regardless of hydrologic conditions. 2006-09-12 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1154448558 http://rave.ohiolink.edu/etdc/view?acc_num=osu1154448558 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Denitrification Created wetlands Nitrous oxide emissions Nitrate pollution Organic matter in wetlands |
| spellingShingle |
Denitrification Created wetlands Nitrous oxide emissions Nitrate pollution Organic matter in wetlands Hernandez, Maria Elizabeth The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA |
| author |
Hernandez, Maria Elizabeth |
| author_facet |
Hernandez, Maria Elizabeth |
| author_sort |
Hernandez, Maria Elizabeth |
| title |
The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA |
| title_short |
The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA |
| title_full |
The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA |
| title_fullStr |
The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA |
| title_full_unstemmed |
The effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern USA |
| title_sort |
effect of hydrologic pulses on nitrogen biogeochemistry in created riparian wetlands in midwestern usa |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2006 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1154448558 |
| work_keys_str_mv |
AT hernandezmariaelizabeth theeffectofhydrologicpulsesonnitrogenbiogeochemistryincreatedriparianwetlandsinmidwesternusa AT hernandezmariaelizabeth effectofhydrologicpulsesonnitrogenbiogeochemistryincreatedriparianwetlandsinmidwesternusa |
| _version_ |
1719426611567132672 |