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| Content Provider | Springer Nature Link |
|---|---|
| Author | Htar, Swe Hlaing Zhu, Wei Huang, Jingyu Nkrumah, Philip Nti |
| Copyright Year | 2013 |
| Abstract | The experiment was conducted to ascertain net production and consumption rates of $^{15}$NH$_{4}$ $^{+}$ and $^{15}$NO$_{3}$ $^{−}$ for water and sediment in a wetland. This was done using $^{15}$N isotope pool dilution methodology under ambient and elevated atmospheric CO$_{2}$ concentrations in experimental riparian wetlands to obtain the gross N transformation rates. The $^{15}$N budget for sediment was also estimated. The results suggested that the differences in high proportion of $^{15}$N concentration in the overlying water body under elevated CO$_{2}$ could be attributed to the low production and high consumption rates of $^{15}$NH$_{4}$ $^{+}$ in sediment. The elevated CO$_{2}$ effect on production and consumption of NH$_{4}$ $^{+}$ decreased by 144 % (P = 0.014) and increased by 153 % (P = 0.009), respectively. Thereby, $^{15}$NH$_{4}$ $^{+}$ production rates are negatively related with $^{15}$NO$_{3}$ $^{−}$ consumption rates and this accounted for the decreases in net $^{15}$NO$_{3}$ $^{−}$ consumption under CO$_{2}$ enrichment in the wetland sediment by 11 % (P = 0.528). Therefore, $^{15}$NO$_{3}$ $^{−}$ production and consumption rates may strongly depend on NH$_{4}$ $^{+}$ production. Inorganic $^{15}$N and total $^{15}$N exported from sediment to overlying water body by the effect of CO$_{2}$ were 41 % (P = 0.071) and 18 % (P = 0.000), respectively. Therefore, low net $^{15}$NH$_{4}$ $^{+}$ production and high $^{15}$NH$_{4}$ $^{+}$ consumption rates under elevated CO$_{2}$ may partly explain the significant reduction of N from the sediment. |
| Starting Page | 3185 |
| Ending Page | 3195 |
| Page Count | 11 |
| File Format | |
| ISSN | 18666280 |
| Journal | Environmental Earth Sciences |
| Volume Number | 70 |
| Issue Number | 7 |
| e-ISSN | 18666299 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2013-03-23 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Elevated CO$_{2}$ $^{15}$NH$_{4}$ $^{+}$ production $^{15}$NH$_{4}$ $^{+}$ consumption $^{15}$NO$_{3}$ $^{−}$ production $^{15}$NO$_{3}$ $^{−}$ consumption $^{15}$N budget Geology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology |
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