1 Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, China 2 KeyLaboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China

Abstract:
The Heilongjiang River Basin in the eastern Siberia, one of the largest river basins draining to the North Pacific Ocean, is a border river between China, Mongolia and Russia. In this study, we examined the spatial and seasonal variability in dissolved organic carbon (DOC), dissolved inorganic carbon (DIC) and dissolved total carbon (DTC) concentrations along lower reaches of Heilongjiang River Basin, China. Water samples were collected monthly along the mouths of main rivers (Heilongjiang River, Wusuli River and Songhua River) and their ten tributary waters for two years. The DOC concentrations of waters ranged from 1.74~16.64 mg/L, with a mean value of 8.90±0.27mg/L (n=165). Notably, mean DIC concentrations were 9.08±0.31mg/L, accounting for 13.26~83.27% of DTC. DIC concentrations increased significantly after the Heilongjiang River passed through Northeast China, while DOC concentrations decreased. Over 50% of DIC concentrations were decreased during exports from groundwater to rice fields, and from ricefields to ditches. Water dissolved carbon showed large spatial and temporal variations during the two-year measurement, suggesting that more frequently samplings were required. Carbon (DIC+DOC) loads from the Heilongjiang River to the Sea of Okhotsk were estimated to 3.26Tg C/year in this study, accounting for 0.64% of the global water dissolved carbon flux. DIC export contributed an average of 51.84% of the estimated carbon load in the Heilongjiang River, acting as an important carbon component during riverine transport. Our study could provide some guides on agricultural water management and contribute to more accurately estimate global carbon budgets.

Keywords:    Potentiometric sensor    Lead ion sensor    Ionophore    Anthraquinone    Aromatic carboxylic acid    Phosphate    Thioamide    Review