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The increase of atmospheric nitrogen deposition has greatly affected soil CO2 emission caused by microbial respiration, probably resulting in the acceleration of global warming. However, the effect of atmospheric nitrogen deposition on soil CO2 emission is not still entirely clear, especially in riparian zone ecosystems. In this study, we studied the riparian zone of the Three Gorges Reservoir after a 36-d soil incubation with four nitrogen species, including NH4Cl, NaNO3, CO(NH2)2 and CO(NH2)2 (28%), as well as NH4NO3 (72%) with three nitrogen addition levels to the soil at 44.39, 88.77 and 133.16 μg N g. Soil cumulative carbon respiration was promoted by 13.37%, 21.55% and 27.59% with the nitrogen addition of 44.39, 88.77 and 133.16 μg N g soil, respectively, increasing linearly with the increase of nitrogen addition levels. However, it was not changed with the nitrogen species. In conclusion, soil cumulative carbon respiration increased with the nitrogen addition levels regardless of the nitrogen species. Thus, induced by atmospheric nitrogen deposition, soil CO2 emission from riparian zone should not be ignored in the twenty-first century.

THE EFFECT OF INCREASED NITROGEN LEVELS ON SOIL CO2 EMISSION CAUSED BY MICROBIAL RESPIRATION IN THE RIPARIAN ZONE OF THE THREE GORGES RESERVOIR