Sablina O.A., Doezzhak A.V.
INFLUENCE OF PHYTOGENIC FIELDS OF TREE SPECIES ON THE PROPERTIES OF SOUTH CHERNOZEMS IN THE PARK AREA OF ORSK ^{[№ 8 ' 2017]}
The data on the influence of phytopogenic fields of Аcer negundo and Populus nigra on the properties of southern chernozem in the Park Stroitelei in Orsk are given. Samples of soil were selected from a depth of 0-10 cm and 10-20 cm in the middle of the projection of the crowns of the trees and beyond the projection of the crown evenly along the entire perimeter. Such properties of chernozems as humus content, catalase activity, pH of water extract are investigated. The content of organic matter in the soils was determined by the method of wet ashing according to I.V. Tyurin and in modification B.A. Nikitin. The catalase activity was determined by the gasometric method. The pH of the water extract was determined in accordance with GOST 26423-85. The reliability of the differences was established by the t-test for p = 0.05. It was revealed that under the crown of the Populus nigra the humus content significantly increases in the 0-10 cm layer. The humus content in the phytogenic field of the maple tree was not significantly altered. The catalase activity in the soil layer 0-10 cm in the phytogenic field of the studied tree species is significantly higher than outside. The pH of the water extract of the soils is the most stable index. In the phytogenic field of trees the pH varies little in comparison with the space behind the projection of the crown. The studied soils can be classified as slightly alkaline in pH, which is quite typical for this subtype of chernozems. Thus, the most sensitive indicator, indicating a change in environmental conditions in the subcircular zone of Аcer negundo and Populus nigra, was catalase activity.