检索结果-南通市图书馆

Ectomycorrhiza of Larix sibirica Ledeb. along the gradients of main ecological factors and elevation at the Northern and Subpolar urals

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2018年第12期15卷 2603-2613页

作者： SIZONENKO Tatyana Alexandrovna DUBROVSKIY Yuriy Alexandrovich Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences Russia SyktyvkarKommunistieheskaya str28Syktyvkar167000Russian Federation

Siberian larch(Larix sibirica Ledeb.) forests cover the largest areas in the Eurasian boreal zone, but there are insufficient data on its root system including the structure and functional traits of ectomycorrhizas(EM). The aim of this research is to find out if the morphological parameters of Larix sibirica EMs responded to the changes in elevation and main ecological factors(soil humidity, soil richness, soil acidity and habitat illumination). Using light microscopy, we studied EM diameter, root diameter, mantle width, and mantle volume share, share of tannin cells layers, EM density and EM length of Larix sibirica in two main types of plant communities along the elevation gradient at the Northern and Subpolar urals. Differences in the environment were traced using phytoindication approach and the Ellenberg ecological scales. All the studied traits depend on the elevation and studied ecological factors. The diversity of fungal mantles is low, and the proportion of unstructured and pseudoparenchymatous mantles is high in response to the deterioration of the humidity, soil nitrogen content and acidity at higher-altitude habitats. Results of EM quantitative parameters measurements confirmed this pattern. We found a decline in the EM linear dimensions accompanied by a compensatory growth of the EM density with the raised elevation and the deterioration of environmental conditions.

关键词： Ectomycorrhiza Larix sibirica Anatomy Fungal mantles diversity Elevation urals

Timanide(Ediacaran–Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex,SW-urals,Russia

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2019年第6期30卷 1144-1165页

作者： Arne P.Willner Michael Gopon Johannes Glodny Victor N.Puchkov Hans-Peter Schertl Institute of Geology Mineralogy and GeophysicsRuhr-University BochumD-44780 BochumGermany College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Deutsches Geoforschungszentrum GFZ、Telegrafenberg 14473 Potsdam、Germany Institute of Geology and Geochemistry Uralian Branch of Russian Academy of Science、620016 EkaterinburgRussia

The Beloretsk Metamorphic Complex in the SW urals formed at a convergent eastern margin of Baltica during the Neoproterozoic–Early Cambrian Timanide *** comprises three major units with lenses of facies-critical metabasites within metasedimentary rocks:A lowermost eclogite unit,an intermediate garnet amphibolite unit and an upper amphibolite-greenschist ***(P)-temperature(T)-paths of four rocks from the two lowermost units were determined mainly by PT pseudosection techniques showing similar clockwise loops at different peak metamorphic,watersaturated conditions:A phengite-bearing eclogite shows peak PT conditions of 16.5–18.5 kbar/525–550℃(stage I)followed by stage II at 11.5–13.0 kbar/585–615℃.A garnet amphibolite from the intermediate unit yields lower peak conditions of 11.7–14.5 kbar/480–510℃(stage I)followed by stage II at 9.5–11.0 kbar/535–560℃.However,a granite gneiss in the eclogite unit shows similar maximum pressures as the eclogite,but higher temperatures at 15.6–16.2 kbar/660–675℃,whereas a garnet micaschist contains comparable high pressure relicts,but underwent an advanced midcrustal reequilibration at 7.5–9.0 kbar/555–610℃.We dated the eclogite by a 7-point Rb/Sr mineral isochron(phengite,omphacite,apatite)at 532.2±9.1 Ma interpreted as age of crystallisation of the eclogitic peak PT *** age is the youngest compared to the known Timanide metamorphic and magmatic ages.

关键词： urals eclogite high pressure metamorphism Timanide orogeny Rb-Sr dating PT pseudosections PT-path

Peat Accumulation and Early Carboniferous Environments of the Kizel Coal Basin,the urals,Russia

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2022年第3期96卷 1098-1112页

作者： Serge V.NAUGOLNYKH Geological Institute of Russian Academy of Sciences Pyzhevsky per.7119017 MoscowRussia

The lithological and geochemical composition and conditions of formation of the coal-bearing deposits of the Kizel Coal Basin in the Perm region of the urals(central Russia)are described using the two most representative sections,Gubakha-Stary Most and Krestovaya Mountain,based on a detailed“layer-by-layer”*** characteristics of the Lower Carboniferous paleosols from fossil paleosol(FPS-)profiles of the studied region are *** attention is paid to the parent vegetation of the coal-forming processes,based on an analysis of both plant macrofossils and *** peat accumulation in conditions of permanent incoming of clastic material from the Paleo-urals to the Kizel Basin was probably effective only in more or less stable environments,when the accumulated organic matter produced by plant mortmass was not dissolved by clastic ***,the conditions of coal-forming are reconstructed as a forest swamp,where the main dominants are represented by lycopodiopsids of the order Lepidodendrales,predominantly Lepidodendron *** plants in particular were the source of the initial organic matter for the peat(and later coal)of the Kizel Coal Basin.

关键词： paleobotany palynology coal lithology paleogeography Viséan urals

Heterogeneity of Mantle Peridotites from the Polar urals (Russia): Evidence from New LA-ICP-MS Data

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2019年第3期30卷 431-450页

作者： Vladimir R.Shmelev Shoji Arai Akihiro Tamura Institute of Geology and Geochemistry Ural Branch Russian Academy of Sciences Yekaterinburg 620075 Russia Earth Science Department Kanazawa University Kanazawa 920-1192 Japan

To discuss the nature of the compositional heterogeneity of the peridotite massifs of the Polar urals(Russia), the geochemical study by LA-ICP-MS of pyroxenes and amphiboles from these mantle formations was performed. The trace element compositions in clinopyroxenes indicate the existence of the mantle protolith of two types. The first protolith type, represented by lherzolites and diopside harzburgites,was originated from the partial melting(5%–10%) under the spinel facies conditions, while the second one,represented by diopside harzburgites, was formed under the polybaric partial melting(17%–19%) under garnet and spinel facies conditions. Subsequently, the mantle peridotite protolith was subject to fluidinduced partial melting in the suprasubduction setting that was resulted in the formation of *** affected by penetrating melts and fluids peridotites experienced the refertilization(LREE enrichment of clinopyroxenes) and high-temperature hydratation with subsequent development of pargasite and Mg amphibole. The high-T fluid-induced metamorphism at the subduction zone was accompanied by the formation of metaperidotites with clinochlore and REE-depleted tremolite.

关键词： pyroxene amphibole peridotite LA-ICP-MS Polar urals Russia

Lower Kungurian shallow-water lagoon biota of Middle Cis-urals,Russia:towards paleoecological reconstruction

在线全文

学校读者我要写书评

暂无评论

Global Geology 2017年第1期20卷 1-13页

作者： Serge V.Naugolnykh Geological Institute of Russian Academy of Sciences 119017 Pyzhevsky per.7MoscowRussia Kazan Federal University Kazan 420008Republic of TatarstanRussian Federation

The paper deals with the Lower Kungurian （Philippovian Horizon; Lower Permian） biota of the Mid-dle Cis-urals, Russia. The biota is characterized on the basis of four representative localities （ Philippovskoe Bus-stop, Philippovskian Quarry, Kamai and Kiselevo-Suksun Highway） , which are situated in the stratotype area of the Kungurian stage. All the localities can be regarded as Lagerstatten, but of authentically low biodi-versity ,since they represent oligotrophic lagoons of abnormal fluctuating salinity. General reconstruction of the Philippovian near-shore shallow-water ecosystem is given. Two new species of algae Algites philippoviensis sp. nov., A. shurtanensis sp. nov., and a new species of the limulids Paleolimulus kunguricus sp. nov. are de-scribed for the first time.

关键词： Permian palaeoecology Kungurian urals algae Algites limulids Paleolimulus

Conodonts from Lower Silurian Strata of the Subpolar urals

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 251-251页

作者： Sokolova Liubov Institute of Geology Pervomajskaya Str 54167982 Syktyvkar

The distribution of Lower Silurian conodonts from the sections on the Kozhym River was studied first by S.V. *** additional studies of the Upper Ordovician-Lower Silurian strata,Oulodus? ***, Walliserodus ***,Panderod... 详细信息

关键词： conodonts Lower Silurian Subpolar urals

Climate change evidence in tree growth and stand productivity at the upper treeline ecotone in the Polar Ural Mountains

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2020年第1期7卷 76-91页

作者： Nadezhda M.Devi Vladimir V.Kukarskih Аrina A.Galimova Valeriy S.Mazepa Andrey A.Grigoriev Institute of Plant and Animal Ecology Ural BranchRussian Academy of Sciences8 Marta202/3Ekaterinburg 620144Russia

Background:Recent warming is affecting species composition and species areal distribution of many ***,although most treeline studies have estimated the rates of forest expansion into tundra,still little is known about the long-term dynamic of stand productivity at the forest-tundra ***,we make use of tree-ring data from 350 larch(Larix sibirica Ledeb.)and spruce(Picea obovata Ledeb.)sampled along the singular altitudinal treeline ecotone at the Polar urals to assess the dynamic of stand establishment and productivity,and link the results with meteorological observations to identify the main environmental ***:The analysis of stand instalment indicated that more than 90%of the living trees appeared after *** this period,the stand became denser and moved 50m upward,while in recent decades the trees of both species grew *** maximum afforestation occurred in the last decades of the twentieth century,and the large number of encountered saplings indicates that the forest is still *** upward shift coincided with a slight increase of May-August and nearly doubling of September-April precipitation while the increase in growth matched with an early growth season warming(June+0.27°C per decade since 1901).This increase in radial growth combined with the stand densification led to a 6-90 times increase of biomass since ***:Tree-ring based twentieth century reconstruction at the treeline ecotone shows an ongoing forest densification and expansion accompanied by an increased *** changes are driven by climate change mechanism,whereby the leading factors are the significant increase in May-June temperatures and precipitation during the dormant *** of phytomass accumulation mechanisms within treeline ecotone is valuable for improving our understanding of carbon dynamics and the overall climate balance in current treeline ecosystems and for predicting how these will be altered by global ch

关键词： Polar urals Treeline Productivity Climate change Radial growth Recruitment Larch Spruce