Optical properties of chromophoric dissolved organic matter (CDOM) of water body in Sanyang wetland, China

摘要

Sanyang wetland in Wenzhou plays an important role in urban ecological system. However, Water body in Sanyang wetland is facing many threats of industrial pollution, agricultural non-point source pollution and domestic living pollution. In order to further understand specific pollution situation, three-dimensional fluorescence fingerprinting technology and ultraviolet spectrophotometry were used to evaluate spatial distribution and temporal trends of optical properties of colored dissolved organic matter (CDOM) in Sanyang wetland. One hundred and sixty eight experimental data in seven sampling sites of Sanyang wetland were monitored during years 2015-2016. The results showed that the degree of organic pollution in Sanyang wetland was different in time and space. In summer, the organic pollution could reach a high level, while the difference in spatial distribution was small, which was related to the intertwined rivers in the wetland. Moreover, It should be emphasized that the characteristics of biological CDOM fluorescence indices in Sanyang wetland were mainly owing to more microorganisms and phytoplankton. Finally, all these results would be expected to be of use in the study of pollution problems of wetland water quality.