МИКРОБИОМОРФНОЕ ИССЛЕДОВАНИЕ ПОЧВ СО ВТОРЫМ ГУМУСОВЫМ ГОРИЗОНТОМ ЮЖНО-ТАЕЖНОЙ ПОДЗОНЫ ЗАПАДНОЙ СИБИРИ

• Main Authors: Гаврилов, Денис, Гольева, Александра
• Format: Text
• Language: unknown
• Published: Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский государственный университет" 2014
• Subjects: ВТОРОЙ ГУМУСОВЫЙ ГОРИЗОНТ; МИКРОБИОМОРФНЫЙ АНАЛИЗ; ФИТОЛИТЫ; СПИКУЛЫ ГУБОК; ЛУГОВО-БОЛОТНОЕ ПОЧВООБРАЗОВАНИЕ; ПОГРЕБЕННЫЕ ПОЧВЫ; Iksa; Short Lake; taiga
• Online Access: http://cyberleninka.ru/article/n/mikrobiomorfnoe-issledovanie-pochv-so-vtorym-gumusovym-gorizontom-yuzhno-taezhnoy-podzony-zapadnoy-sibiri; http://cyberleninka.ru/article_covers/15572824.png

В результате исследования нами установлено, что вторые гумусовые горизонты представляют собой реликты лугово-болотного почвообразования, педолитореликты (аллювиальная почва), а также литореликты (сапропель). Генезис вторых гумусовых горизонтов связан с улучшением дренируемости территории вследствие углубления речной сети. Образование на глубине вторых гумусовых горизонтов есть результат регионального этапа седиментации и погребения. По данным микробиоморфного анализа в растительном покрове не выявлено изменений, выходящих за рамки зональных характеристик южнотаежной подзоны. Long-term studying of such wide-spread phenomenon in the southern taiga subzone as the second humus horizon made researchers create the theory of illuvial or relict genesis. At the present stage, the theory of relict genesis is the most proved. The problems of determining the soils which served as the bases for the second humus horizons forming have not been solved so far. Different soils of steppe and forest-steppe zones of automorphic and semihydromorphic soil forming conditions (Chernozems, Meadow-Chernozems, Chernozem-Meadow or Meadow-Bog and Meadow-Forest soils) are supposed to be original ancient soils. The question how the second humus horizons are formed is still being discussed. Our article is devoted to the results of studies on microbiomorphs (phytoliths, diatoms, sponges, pollen and spores) to reveal regional peculiarities of forming the second humus horizons of the Western Siberian southern taiga subzone soils. The studied objects are located within the Vasyugan plain (Tomsk oblast, Russia). A series of broken sections covers basic varieties of soils with the second humus horizon (AU[hh]), which are located in different geomorphological positions relative to the Iksa riverbed. The examination included two stages: field observation with sampling and further cameral treatment with isolating and studying the microbiomorphic fraction. Our results have demonstrated that the second humus horizons are relicts of meadow-bog pedogenesis and also pedolythorelicts formed due to alluvial sedimentation of organic material or its accumulation in water-short lake (sapropel). The second humus horizon genesis is connected with drainage improvement of the territory due to the Iksa riverbed becoming deeper. The second humus horizons forming within the profile is the result of regional sedimentation stage and their burning. According to microbiomorphic analysis data, we have not revealed any phytocenosis changes overcoming subtaiga zonal characteristics. The studying results expand the knowledge of the second humus horizon genesis and of evolution of soil forming conditions in the Western Siberian south-taiga subzone in the second half of Holocene. The article contains 5 figures, 1 table and 25 ref.