Conclusions and Prospect

Abstract

Freeze–thaw can promote the production and fixation of DOC, NH₄ ⁺–N and NO₃ ⁻–N in wetland soils, and promote the depletion and release of wetland soil organic carbon and organic nitrogen. The DOC, NH₄ ⁺–N and NO₃ ⁻–N concentrations in the water overlying wetland and downstream water bodies will increase in the freeze–thaw period. As a result of global warming, fixation of DOC and NH₄ ⁺–N and the release of organic carbon in wetland soils may be weakened. Wetland reclamation also promotes the release of DOC and NH₄ ⁺–N from wetland soils.