Open AccessCHARACTERISTICS OF CHEMICAL COMPOSITION OF UPPER HORIZONS OF SOILS OF ROADSIDE PHYTOCENOSIS
Author(s) -
Gulsem Salimovna Alimova,
Alena Yurievna Tokareva,
Elena Popova
Publication year - 2018
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 2687-1076
pISSN - 1812-9498
DOI - 10.24143/1812-9498-2018-1-95-100
Subject(s) - soil water , soil salinity , chemistry , salinity , nitrate , environmental chemistry , ammonium , nitrite , nitrogen , chemical composition , composition (language) , soil horizon , sulfate , botany , environmental science , soil science , ecology , biology , linguistics , philosophy , organic chemistry
Geobotanical descriptions of roadside phytocenoses of south of the Tyumen region were made within the boundaries of five administrative districts: Uporovsky, Zavodoukovsky, Yalutorovskiy, Yarkovsky, Tobolsk. Soil cuts were taken at each site and their morphological and chemical characteristics were determined. The biogenic composition (nitrite nitrogen, nitrates, mobile phosphorus compounds, exchange ammonium), the degree and type of soil salinization have been determined. The investigated soils, in accordance with the taxonomy of A. G. Dyukarev, belong to sod podzolic and podzolic types, typical subtype, ordinary genus. As for degree of salinity, soils are non-saline. Type of salinity is chloride-sulfate, sulfate. The reaction of the aqueous extract medium is weakly acidic. Biogenic elements determined during the study are concentrated to a greater extent in the upper horizons of the soil and are characterized by a low degree of availability of available phosphates in all areas from 28 to 50 mg/kg (movable forms). The nitrate content in all areas is in the same range, from 0.2 to 0.8 mg/kg. Distribution of ammonium metabolic (4.5-23.6 mg/kg), nitrates vary from 0.2 to 0.8 mg/kg. The content of nitrite nitrogen in all soil samples is minimal: less than 0.037 mg/kg of soil. The investigated phytocenoses are characterized by poor and stable floral composition. Most of the total projective cover of studied phytocenoses account for synanthropic species. Synanthropization index of the flora of the studied phytocenoses lies within 43-64%.