Spatial and temporal distribution of dissolved organic carbon in Tuojia River watershed
To discover the characteristics of dissolved organic carbon(DOC)in water in small scale agricultural watershed and its relation-ship with the environment variables, a one-year’s continuous survey(from December 2014 to November 2015)was conducted to observe the variation of DOC concentration and environmental factors in 4 different reaches of Tuojia River(S1, S2, S3 and S4)by the Gas Chromatog-raphy and high temperature catalytic oxidation method(HTCO). Results showed that the concentration of DOC ranged from 0.46 to 9.54 mg·L-1, with an average value of 3.09 mg·L-1 in the four reaches water of Tuojia River. Moreover, the spatial distribution of DOC concentra-tion increased gradually from 1.36 to 4.25 mg·L-1 with the river levels(from S1 to S4), and the DOC concentration presented the significant differences among 4 reaches(P<0.01), which demonstrates that the exogenous contamination may lead to the variation of DOC concentration in different reaches. Additionally, the DOC has a positive correlation with the dissolved carbon dioxide(CO2)concentration, salinity, tem-perature, TDS and EC(P<0.01), while DOC concentration showed a negative correlation with the dissolved oxygen(P>0.05). The results of our study indicated that the intensity of different physical and chemical properties of water and exogenous contamination are the main reason for spatial and temporal variation of DOC concentration in Tuojia River. This research may provide important reference for further under-standing and research on the source and control of DOC load in small agricultural watershed in subtropical China.
dissolved organic carbonspatial and temporal distributioninfluence factorsTuojia River
国家科技期刊平台
NSTL
万方数据
维普
