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Spectral characteristics of chromophoric dissolved organic matter (CDOM)were examined in conjunction with environmental factors in the waters ofrivers and terminal lakes within the Hulun Buir plateau, northeast China.Dissolved organic carbon (DOC), total nitrogen (TN), and total phosphorous (TP)were significantly higher in terminal lakes than rivers waters(p  <  0.01). Principal component analysis (PCA) indicated that non-water light absorption and anthropogenic nutrient disturbances were thelikely causes of the diversity of water quality parameters. CDOM absorptionin river waters was significantly lower than terminal lakes. Analysis of theratio of absorption at 250 to 365 nm (E250 : 365), specific ultraviolet (UV) absorbance(SUVA254), and the spectral slope ratio (Sr) indicated that CDOMin river waters had higher aromaticity, molecular weight, and vascular plantcontribution than in terminal lakes. Furthermore, results showed that DOCconcentration, CDOM light absorption, and the proportion of autochthonoussources of CDOM in plateau waters were all higher than in other freshwaterrivers reported in the literature. The strong evapoconcentration, intenseultraviolet irradiance, and landscape features of the Hulun Buir plateau may beresponsible for the above phenomenon. Redundancy analysis (RDA) indicatedthat the environmental variables total suspended matter (TSM), TN, andelectrical conductivity (EC) had a strong correlation with light absorptioncharacteristics, followed by total dissolved solid (TDS) and chlorophyll a. In most samplinglocations, CDOM was the dominant non-water light-absorbing substance. Lightabsorption by non-algal particles often exceeded that by phytoplankton inthe plateau waters. Study of these optical–physicochemical correlations ishelpful in the evaluation of the potential influence of water qualityfactors on non-water light absorption in cold plateau water environments.The construction of a correlation between DOC concentration and waterquality factors may help contribute to regional estimates of carbon sourcesand fate for catchment carbon budget assessments

Influence of environmental factors on spectral characteristics of chromophoric dissolved organic matter (CDOM) in Inner Mongolia Plateau, China