Abstract
Inter-year variability of hydrochemical indicators of water quality was studied for the main rivers of Primorye: Ussuri, B.Ussurki, Razdolnaya, as well as the Knevichenka river with the maximum anthropogenic load. Analysis was based on the data obtained at the stations of the GSN Primorsky UGMS in 2001-2017. A significant increasing the average annual concentration of nitrates has been detected both in the relatively clean rivers Ussuri and B. Ussurka, as well as in the rivers Razdolnaya and Knevichenka contaminated due to human activities. The increase is correlated with the volume of mineral fertilizers used, indicating the intensification of agriculture in the region as a cause of deterioration in water quality. The inter-annual variability of phosphate concentrations is non-linear, possibly due to changes in the composition of detergents, which are an important source of phosphates in surface waters. A significant trend of growth of COD, found in the relatively clean rivers Ussuri and B. Ussurka, can be associated with both an increase in annual water runoff and a change in the structure of the land field.
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