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The dissolved organic matter (DOM) composition in river ecosystems couldreflect the human impacts on the river ecosystem, and plays an important rolein the carbon cycling process. We collected water and phytoplankton samples at107 sites in the Dongjiang River in two seasons to assess the impact of thesub-catchments land use structure on the DOM composition. The results showedthat (1) the forested sub-catchments had higher humic-like C1 (16.45%) and C2(25.04%) and lower protein-like C3 (22.57%) and C4 (35.95%) than urbanized andmixed forest-agriculture sub-catchments, while the urbanized sub-catchmentsshowed an inverse trend (4.54%, 15.51%, 33.97% and 45.98%, respectively). (2)The significant variation in the proportion of C1 and C4 between the dry andrainy seasons was recorded in both the forested and the mixedforest-agriculture sub-catchments (p<0.01), but only C4 showed an obviousseasonal variation in the urbanized sub-catchments (p<0.01). While the DOMcomposition was mainly related to the proportion of urbanized land and forestedland year-round (p<0.01), it had stronger correlation with forested land in thedry season and urbanized land in the rainy season. (3) No significantcorrelation between the DOM composition and the agricultural land proportionwas found in either season (p>0.05). Our findings indicated that the DOMcomposition was strongly dependent on the land use structure of thesub-catchments and varied seasonally, but the seasonal variation pattern couldbe disturbed by human activities in the extensively urbanized catchments.Notably, the higher C4 proportion compared with those in temperate riversimplied a larger amount of CO2 released from the subtropical rivers into theatmosphere when considering bioavailability.

Impact of Land Use on the DOM Composition in Different Seasons in a Subtropical River Flowing through the Region Undergoing Rapid Urbanization