The dynamics of changes in the species diversity of
radiolarians during the last 150 million years with
accuracy to one geological century was determined.
The basic patterns of species and taxa of high rank
change had been established for the boundary
between Cretaceous and Paleogene. There were
revealed topomorphic features of bipolar species,
which have succeeded from the Cretaceous into the
Paleogene and became ancestors of Cenozoic
radiolarian fauna. Changes in the species number in
the boundary between Cretaceous and Paleogene
periods, and also significant variations in the species
diversity in Paleocene and Eocene are connected to a
combination of a number of factors. The most
important of those factors are geological processes,
causing extensive transgressions and regressions,
climate variability, the overall evolution direction of
the Earth biota and competition for important
chemical components for the Radiolaria’s livelihood.
The emergence of powerful tropical forests on the
land with their huge bio-production and bio-chemical
erosion is connected to late Cretaceous era. This
resulted increasing of the dissolved material
proceeding into the sedimentation pool, what is
confirmed by classical bauxites emergence. Because
aluminium oxide and silicon oxide are geochemically
connected, we can state as well about
increasing of dissolved silica flow initiated
development of Diatoms, which became competitors
to Radiolaria in their battle for silica. The last ones
are lost this battle, what caused the species
decreasing. That was not a catastrophic event with
immediate extinction, but a long process
In this study, we have investigated the migration of
paclobutrazol in the sod-podzolics soils. The migration
of pesticide was restricted with 5 cm in the field study.
Paclobutrazol was found in 11 days after application in
the lysimeter’s water samples, though the pesticide is
moderately mobile. The lysimeter study showed that
the risk of ground water contamination would exist if
application of paclobutrazol was on the sod-podzolics
medium loamy soils. The modeling by PEARL 4.4.4
and MACRO 5.2 simulated the migration of
paclobutrazol until 18 cm in the soil. MACRO was
able to predict the leaching of pesticide. The simulated
paclobutrazol losses by leaching were consistently
lower than the observed
We have analyzed patterns of change in deformations at frost penetration depending on the humidity, density and concentration of the salt solution pore of CaCI2
We have analyzed patterns of change in deformations at frost penetration depending on the humidity, density and concentration of the salt solution pore NaCI
Hydrothermal conditions have a significant effect on catalase activity of soils of the South of Russia. The linear dependence of catalase activity in the upper horizons soils from average annual rainfall, aridity index of de Martonne and the coefficient of moisture of Mezentseva. In terms of catalase activity of the
entire humus profile we revealed that the maximum activity has leached black soil, located in the medial climate conditions of the South of Russia
In this article we have analyzed the geological structure of the deposit; thickness of stripping soils, ore, sub-standard layers and cavernous rocks were estimated, made estimation of reserves and given the qualitative characteristics of the ore
In this article we have analyzed the geological structure and hydrogeological conditions of the minefield; we have also shown the characteristic of land planned for recultivation. We have found that recultivation provides different directions
Hydrogeological conditions and problems of regional hydrogeological works of the territory of the Perm Ural and Priurals are characterized. Possibility of providing the population is shown by fresh underground waters. The methodology of mapping of the water-bearing zones on a complex of the methods including the lineament-geodynamic analysis with allocation of geodynamic active zones on the basis of remote researches and geoinformation technologies is considered
The original soils were investigated at the Black Sea coast of Russia. Severe degradation of the soil in a Utrish nation reserve were identified as a result of high recreational pressure. Soils with high recreational load have low humus content (2-3 times) and a lower en-zymatic activity than the control of the soil. Biological parameters can be successfully used for environmental monitoring of soil of Utrish reserve, in contrast to the chemical and physic-chemical properties
Climatic conditions have considerable impact on biological properties of soils of the South of Russia. From all studied indicators the most dependent on climate there was maintenance of a humus and activity of polyphenoloxidases and peroxidases. Values of the integrated indicator of a biological condition (IIBC) on a profile of soils decrease in process of increase in an amount of precipitation, decrease in temperature, and increase in height of the district in next order: meadow
subalpine → brown forest → gray forest → black leached soil → black typical soil → black ordinary soi