Content and distribution of different forms of copper and zinc in calcic chernozem in ampelocenosis of Rostov Region

The results of studies of the content and distribution of various forms of copper and zinc in the calcic chernozem in the ampelocenoses of the central irrigated natural-agricultural zone of the Rostov Region are presented. It has been established that the content of gross and mobile forms of copper and zinc in the soils of industrial fields corresponds to the background level and does not exceed the maximum allowable concentrations. According to the content of mobile forms of biomicroelements, the supply of southern chernozem with zinc is low (<2.0 mg/kg), with copper ‒ medium (0.21‒0.50 mg/kg). When calculating the coefficients of radial differentiation, a general pattern was revealed in the distribution of gross and mobile compounds of copper and zinc under ampelocenosis conditions, due to their gradual decrease down the soil profile and active accumulation in humus-accumulative horizons. The content of the gross form of copper (horizon Ap ‒ 62.69 mg/kg) decreases down the profile by 31.7% to 42.80 mg/kg in horizon C, gross zinc in horizon Ap (98.47 mg/kg) decreases by 20.6% to 78.18 mg/kg in horizon C. The content of mobile forms of trace elements is also characterized by their gradual decrease: the amount of copper in the Ap horizon is 0.29 mg/kg, decreasing by 34.5% down the profile to 0.19 mg/kg (C horizon), for zinc ‒ by 50% from Ap horizon (0.36 mg/kg) to C horizon (0.18 mg/kg). It was revealed that the low content of mobile compounds of biomicroelements in the southern chernozem is due to its physicochemical properties, including the content of carbonates. An inverse correlation was noted between the studied trace elements and CaO: for copper r = −0.85, for zinc r = −0.81.

Rostov Region, calcic chernozem, mobile and gross forms of copper and zinc, vineyard, ampelocenosis