Potential capability of soils of Yamalo-Nenets Autonomous region (Western Siberia) for woody plants cultivation

Lead Author Ksenia, Bakhmatova
Institution Contact St. Petersburg State University, Universitetskaya nab. 7-9, St. Petersburg, 199034, Russia
Co-Authors Alexandr Egorov, St. Petersburg State University, Russia
Theme Theme 1: Vulnerability of Arctic Environments
Session Name 1.6 Strategies for ecosystem services and sustainable environmental management of soils and contaminated areas in the Arctic
Presentation Type Poster
Abstract text The soils on experimental sites of woody plants cultivation in the forest tundra and northern taiga in Yamalo-Nenets Autonomous region (Western Siberia) were investigated. The aim is to find out the soil capability for woody plants cultivation. Native soils of the region refer to Al-Fe-humus podzols, cryozems, peat soils and alluvial soils, according classification system of the soils of Russia (2004, 2008) and Carbic and Rustic Podzols, Histic and Turbic Cryosols, Cryic Fibric Histosols and Fluvisols (IUSS Working Group WRB, 2015). The anthropogenic soils of experimental sites in Salekhard and Nadym refer to replantozems (Russian soil classification system, 2004, 2008). Studied soils are predominantly acidic and strongly acidic (pHKCl = 3,2-5,3; рН H2O = 3,9-6,1) and base-unsaturated. At the same time the replantozems have a neutral reaction (pHKCl = 5,6-5,9; рН H2O = 6,3-7,2). Hydrolytic soil acidity and exchangeable base status of surface horizons vary considerably (0,25-63,0 mmol/100g and <0,2-10,1 mmol/100 g, respectively), depending on type of horizon (organic or mineral) and cation exchange capacity. Organic matter content also varies (from <0,5 to 5-7 %). The significant increase of organic matter content to 11-14% and more was found after peat and peat-humus material addition. The majority of investigated soils have very low content of mobile forms of N, P, K. The low availability of nutrients partly depends on sandy and loamy-sandy texture of soils, which is advantageous in terms of their faster heating in summer. Light textured soils also have insufficient water capacity that may lead to instability of plants water supply during warm period without precipitation. The optimal availability of plant nutrients should be maintain by addition of mineral and organic fertilizers. It is also recommended to carry out the entire set of agronomic practices, including watering, when it needs to.
This work was supported by the Yamalo-Nenets Autonomous District (N01-15/4_25.07.2012).