Geoinformational technologies in the problem of assessing the pesticides’ impact on the arid zones soils’ condition

Abstract

The work is devoted to establishing the influence of aridity on the risk of negative soil changes caused by residual pesticides presence in spring and autumn. Using the Earth’s remote sensing method, it is shown that the NDMI index is decreasing and aridity is increasing in the following direction: Lipetsk Oblast- Kursk Oblast - Voronezh Oblast-Belgorod Oblast-Ulyanovsk Oblast -Samara Oblast -Saratov Oblast - Penza Oblast -Orenburg Oblast --Stavropol Krai-Karachay-Cherkessia. Correspondence was established between the increase in region’s aridity and the increase in the risk increment value for the period from spring to autumn due to the presence of residual pesticide content in the soil. This circumstance can be associated with pesticides accumulation in the soil cover, an increase in their consumption and a decrease in destruction in conditions of arid climate. DDT and hexachlorocyclohexane cause the highest risk increment due to soil accumulation, trifluraline is more subjected to conversion in the soil, has less effect on risk change of soil agroecological condition.