Marhaba TURHUN¹, Mamattursun EZIZ^1,2, Aynur MATNURI¹, WANG Weiwei¹

(1. College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;
2. Xinjiang Laboratory of Lake Environment and Resources in Arid Zone, Xinjiang Normal University, Urumqi 830054, China)

Abstract：The heavy metal pollution risk assessment of soil and agricultural products is a hot topics in the related research fields worldwide. A total of 101 typical vineyard soil samples were gathered from vineyards of the Turpan basin, Xinjiang, and concentrations of six heavy metals (As, Cd, Cr, Ni, Pb and Hg) in the soil samples were identified. The characteristics and spatial distributions of environmental capacities of heavy metals in vineyard soils were analyzed based on the GIS technology and the comprehensive environmental capacity index (PI). The static and dynamic environmental capacities of heavy metals in soils of the Turpan basin were estimated by the soil environmental capacity model and their changing trends were also predicted. The results showed that: (1) The average concentrations of As, Cd, Cr, Ni, Pb and Hg in vineyard soils of the Turpan basin did not exceed their limits guided by the “Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land” (GB15618-2018); (2) The average values of the single environmental capacity index for heavy metals in vineyard soils ranked as: Ni > Pb = Hg > As > Cr > Cd. Among them, the environmental capacity of Ni fell into the high capacity level, while the environmental capacities of As, Cd, Cr, Pb and Hg fell into the medium capacity level. 98.02% of vineyard soils in the study area fell into the medium-capacity zone, PI values of heavy metals in vineyard soils from the central area of the study area were higher than those from eastern and western areas; (3) The static annual capacity and the dynamic annual capacity showed a same order: Cr > Ni > Pb > As > Hg > Cd. The changing rates of static and dynamic annual capacity within 20~40a were higher than those of other times, and the dynamic annual capacity of each year was greater than the corresponding static annual capacity.

Key words: vineyard soil; heavy metals; environmental capacity; Turpan basin

EARTH AND ENVIRONMENT Vol.48, No.5, Tot No.337, 2020, Page 584-592