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1.
Geoarchaeological methods were used to study chronosequences of surface soils in the steppe zone and to trace soil evolution during the Late Holocene in northwestern Crimea. It was found that the morphological and functional “maturity” of the humus horizons in steppe chernozems of the Late Holocene was reached in about 1600–1800 yrs. After this, their development decelerated irreversibly. The maximum concentration of trace elements accumulated in these horizons in the course of pedogenesis was reached in 1400 yrs. A new method of pedogenetic chronology based on the model chronofunction of the development of irreversible results of pedogenesis over time is suggested. Original pedochronological data and growth functions—the most suitable models for simulating pedogenesis over the past three thousand years—suggest that the development of morphological features of soil as an organomineral natural body follows growth patterns established for biological systems. 相似文献
2.
The study of soils of different ages in different physiographic regions of the Crimean Peninsula made it possible to reveal
the main regularities of pedogenesis in the Late Holocene (in the past 2800 years). With respect to the average rate of the
development of soil humus horizons, the main types of soils in the studied region were arranged into the following sequence:
southern chernozems and dark chestnut soils > mountainous forest brown soils > gravelly cinnamonic soils. In the newly formed
soils, the accumulation of humus developed at a higher rate than the increase in the thickness of humus horizons. A sharp
decrease in the rates of development of soil humus profiles and humus accumulation took place in the soils with the age of
1100-1200 years. The possibility for assessing the impact of climate changes on the pedogenetic process on the basis of instrumental
meteorological data was shown. The potential centennial fluctuations of the climate in the Holocene determined the possibility
of pulsating shifts of soil-geographic subzones within the steppe part of the Crimea with considerable changes in the rates
of the development of soil humus horizons in comparison with those in the Late Holocene. 相似文献
3.
The development of forest-steppe and steppe chernozems on the Dniester-Prut interfluve in the Holocene was studied on the basis of data on the paleosols buried under archaeological monuments of different ages. The parameters of the mathematic models of the development of the soil humus horizons in different subtypes of chernozems were calculated. They were used to determine the rate of this process and the age of the soils formed on the surface of Trajan’s lower rampart. The climate-controlled changes in the character of the soil’s development in the Late Holocene were differently pronounced in the different subtypes of chernozems. The suggested differentiation of the trends in the development of the humus horizon in the studied chernozems corresponds to the differences in the soil-forming potential of particular areas (as judged from the energy consumption for pedogenesis). 相似文献
4.
5.
In chernozems developed in the autonomous positions in Moldova, the mineralogy of their silicate component has some features indicative of stronger transformations than those that could be expected for the chernozems formed by the Holocene pedogenesis. The mineralogical profiles testify to the eluvial nature of the main subtypes of chernozems. It is suggested that the revealed changes are not due to the Holocene pedogenesis. According to the probable age of the mineralogical profiles calculated from the volumes of aluminosilicates removed, these profiles originated in the early and middle Late Pleistocene, i.e., about 50 000–120 000 years ago. The effect of forest pedogenesis in the past epochs on the mineralogy of the northern subtypes of chernozems also cannot be excluded. The presented data characterize the chernozems under study as polygenetic soil formations. 相似文献
6.
Approaches to the quantification of the vertical translocation rate of soil solid-phase material by the magnetic tracer method have been developed; the tracer penetration depth and rate have been determined, as well as the radial distribution of the tracer in chernozems (Chernozems) and dark gray forest soils (Luvisols) of Belgorod oblast under natural steppe and forest vegetation and in arable lands under agricultural use of different durations. It has been found that the penetration depth of spherical magnetic particles (SMPs) during their 150-year-occurrence in soils of a forest plot is 68 cm under forest, 58 cm on a 100-year old plowland, and only 49 cm on a 150-year-old plowland. In the chernozems of the steppe plot, the penetration depth of SMPs exceeds the studied depth of 70 cm both under natural vegetation and on the plowlands. The penetration rates of SMPs deep into the soil vary significantly among the key plots: 0.92–1.32 mm/year on the forest plot and 1.47–1.63 mm/year on the steppe plot, probably because of the more active recent turbation activity of soil animals. 相似文献
7.
The evolution of alluvial soils in the Bikin River basin in the Middle and the Late Holocene is discussed. On the basis of biostratigraphic data, four pollen zones have been identified in the soils: Pinus koraiensis-Picea, Pinus koraiensis-Quercus-Sphagnum, Betula-Alnus-Alnaster, and Quercus. A set of soil characteristics (texture, acid-base properties, and the organic matter content and group composition) have also been determined. These data allow us to distinguish between four stages of alluvial soil formation in the Bikin River basin. They characterize humus-forming conditions in the Middle and the Late Holocene. Reconstruction of ancient vegetation conditions makes it possible to conclude that climatic fluctuations were synchronous with changes in the soil characteristics. During the Holocene climatic optimum, humus was formed in a slightly acid medium, and humic acids predominated. In cold periods with increased precipitation, fulvic acids predominated in the composition of humus, and the portion of insoluble residue was high because of the more acid medium. The stages of alluvial pedogenesis in the Bikin River valley follow the sedimentation model of soil evolution. Alluvial gray humus soils evolved from typical gray humus soils under meadow communities during warm periods to gleyic and gleyed soils under birch shrubs and alder groves in colder and wetter periods. 相似文献
8.
L. S. Pesochina 《Eurasian Soil Science》2010,43(13):1547-1556
The direction and stages of pedogenesis, rate and scales of changeability, and type of evolution of chernozems in the steppes
of the Lower Don are ascertained by studying the archaeological monuments of the Bronze Age, Early Iron Age, and Middle Ages.
It is shown that the soil formation process was characterized by cyclicity, and evolutional soil transformations took place
at the level of subtype. The paper ascertains the polygenetic character of modern chernozems, whose evolution during the second
half of the Holocene was predominantly low-contrast, inheriting, and transforming. The processes forming the humus, salt,
gypsum, and carbonate profiles, as well as the processes of solonetzization-desolonetzization, were the most dynamic. The
fundamental differences in the genesis of different parts of the humus profile are revealed. The role of climatically pulsing
solonetzicity in forming the specific Azov chernozems is for the first time ascertained. 相似文献
9.
S. P. Lomov A. V. Lyganov A. A. Khisyametdinova I. N. Spiridonova N. N. Solodkov 《Eurasian Soil Science》2017,50(5):539-548
The construction of the Volga–Kama cascade of water reservoirs and hydroelectric power stations in the middle of the 20th century resulted in the inundation of vast areas and the development of abrasion along the shores that threatens many monuments of the archaeological and cultural heritage. The soils buried under northernmost kurgans of the Lugovskaya culture dating back to the 15th–14th centuries BC (kurgan Komintern I) were studied on the surface of the second terrace of the Kama River near its confluence with the Volga River. Burial sites of kurgan Komintern III were subjected to destruction in 1981, and archaeological excavations of kurgan Komintern II were performed in 2008. The danger of complete disappearance of these archaeological sites necessitated their thorough study with the use of multiple methods, including special paleosol studies. The soils buried under the kurgans ceased to be active components of the soil cover about 3500 years ago. They preserve information on the paleoenvironmental conditions before their burying. The analysis of morphological features and physical, physicochemical, and chemical properties of the buried soils attests to their chernozemic nature. Background surface soils that have passed through the entire cycle of the Holocene pedogenesis have evolved since that time into gray forest soils (Luvic Greyzemic Phaeozems) under forest vegetation. These soils are characterized by the increased acidity of the surface horizons (pHКСl 4.3) and the development of lessivage. Data on the coefficients of mineral weathering in the buried paleosols and background surface soils attest to the identical precipitation both for the surface and buried soils in the Middle and Late Holocene. 相似文献
10.
The features of ancient periglacial phenomena are widespread in landscapes lying beyond the modern permafrost zone. The specificity of the paleogeographic conditions in the south of the Baikal region resulted in the formation of paleocryogenic landscapes with hummocky-hollow landforms. The paleocryogenic mounds (hummocks) are of rounded or elongated shape, their height is up to 2–3 m, and their width is up to 20–25 m. They are separated by microlows (hollows). This paleocryogenic microtopography favors the differentiation of the pedogenesis on the mounds and in the hollows, so the soil cover pattern becomes more complicated. It is composed of polychronous soils organized in complexes with cyclic patterns. Light gray and gray forest soils and leached and ordinary chernozems are developed on the mounds; gray and dark gray forest soils and chernozems with buried horizons are developed in the hollows. The soils of the paleocryogenic complexes differ from one another in their morphology, physical and chemical properties, elemental composition, and humus composition. For the first time, radiocarbon dates have been obtained for the surface and buried humus horizons in the hollows. The results prove the heterochronous nature of the soils of the paleocryogenic landscapes in the south of the Baikal region. 相似文献
11.
Alifanov V. M. Gugalinskaya L. A. Ivannikova L. A. Ovchinnikov A. Yu. 《Eurasian Soil Science》2006,39(1):S31-S39
Soil studies in cultural landscapes of the medieval epoch within the Vladimir opolie territory on the Russian Plain suggest that virtually all automorphic soils in this area were plowed in that period. The morphology of the profiles of studied soils depends on the composition of parent materials. If the parent material represents a pedocyclith that passed through the stage of periglacial pedogenesis in the Late Pleistocene, then the soil profile developed from this material is a heterochronous body with distinct features of polygenesis. If the parent material is a relatively homogeneous sediment that was not subjected to periglacial pedogenesis in the Late Pleistocene, then the soil profile developed from this material contains only the features of the Holocene pedogenesis, even in the case when the thickness of the homogeneous substrate does not exceed 0.5 m. It is hypothesized that the Holocene pedogenesis within the humid forest and southern taiga zones in the center of the Russian Plain cannot delete the features of the pre-Holocene pedogenesis and morpholithogenesis; these features are always inherited by the profiles of modern soils. The presence of these features ensures the development of a fully developed mature soil profile. 相似文献
12.
13.
T. V. Prokof’eva O. A. Varava S. N. Sedov A. M. Kuznetsova 《Eurasian Soil Science》2010,43(4):368-379
At present, many parts of river valleys, including floodplains, are being actively used for urban construction. This leads
to the disturbance of normal functioning of the valleys; alluvial deposits and soils become buried under the thickness of
various anthropogenic materials. Four profiles of typical urban soils (urbanozems) developed on the floodplain of the Moskva
River and its small tributaries have been studied. The macro- and micromorphological characteristics (including data of submicroscopic
studies) and the chemical and physicochemical properties of these soils are analyzed. It is shown that the influence of ground-water
on the anthropogenically transformed soils of floodplains and low terraces is preserved even upon the cessation of regular
flooding. The substitution of urban pedosedimentogenesis for alluvial pedosedimentogenesis has a gradual character with a
transitional stage of simultaneous occurrence of both processes. Clayey and clayey-calcareous infillings in the middle-profile
horizons and newly formed phosphates of iron and calcium in the lower horizons affected by the groundwater can be considered
typical diagnostic features of the urban-alluvial pedogenesis. 相似文献
14.
Temporal changes of eroded soils depending on their agricultural use in the southern Cis-Ural region
I. M. Gabbasova R. R. Suleimanov I. K. Khabirov M. A. Komissarov M. Fruehauf P. Liebelt T. T. Garipov L. V. Sidorova F. Kh. Khaziev 《Eurasian Soil Science》2016,49(10):1204-1210
Temporal changes of eroded soils in the southern Cis-Ural region (Republic of Bashkortostan) depending on their agricultural use during the period from 1975 to 2011 were studied. In the northern foreststeppe zone, the development of erosion processes was retarded upon the use of soil-saving management practices and grain-fallow-grass crop rotations. In slightly eroded light gray forest soils (Eutric Retisols (Cutanic)), the thickness of humus-accumulative horizons and the content of humus increased; the conversion of cropland into permanent fallow was found to be the most efficient measure to control soil erosion. In podzolized chernozems (Luvic Greyzemic Chernic Phaeozems) and typical chernozems (Haplic Chernozems) of the Cis-Ural steppe, the content of humus in the plow layer under grain-row crop rotation and classical soil management decreased, especially in moderately eroded soils. The development of water and wind erosion on slopes depended on the slope shape: the texture of soils at different degrees of erosion on slopes with free runoff became coarser by one gradation after 35 years; in the presence of linear obstacles in the lower part of slopes, the content of fine fractions in moderately and strongly eroded soils increased. 相似文献
15.
Pedogenesis of chernozems in the upper river terrace of the Danubian river near Ulm (South West Germany) The “chernozem-like” soils in the upper river terrace of the Danubian river near Ulm (FRG) were examinated. Field analyses as well as soil physical and chemical, clay mineralogical and pollen analyses were carried out. The parent material of the soils was identified as loess, on the basis of its texture, clay mineral composition, structure, carbonate content, the presence of loess molluscs, and the location on an upper river terrace with loess findings in the surrounding. Characteristic pedogenetic processes, such as deliming, silicate weathering, formation of oxides and hydroxides, neoformation of clay minerals and clay translocation prove a non-groundwater-influenced development of the soils within at least the last 8000 years. Therefore an accumulation of organic matter under anaerobic conditions during the peat formation in the lower river terrace nearby was not possible. According to this finding, it can be deducted that the humus accumulation may be due to influences of continental climate and forest steppe during the preboreal period, whereby the humus horizons were formed at deeper horizons through bioturbation. After the groundwater level was raised in boreal age, the steppe stage of the soils had ended and the fluctuating levels of groundwater, rich in carbonates, stabilized humic substances. Thus strong degradation of the soils to date was prevented. Therefore the soils under study could be classified as gleyic Chernozems or luvic Phaeozems. 相似文献
16.
A generalized chronosequence of changes in the morphometric parameters of chernozems in the past 5100 years is analyzed. It
is shown that the development of chernozems in the center of the East European Plain is characterized by both long-term (interglacial,
encompassing the entire Holocene) and short-term (within separate climatic periods of the Holocene) trends. The long-term
trend of the evolution of ordinary chernozems developed from the loess-like calcareous loam consists of a continuous increase
in the thickness of the soil humus profile and an oscillating increase in the depth of the carbonate accumulations. The Late-Holocene
short-term trends of the natural evolution of chernozems are characterized by the high spatial heterogeneity related to the
patterns of climatic fluctuations and to the lithological composition of parent materials. In that period, the thickness of
genetic horizons in the forest-steppe chernozems was increasing faster than that in the steppe chernozems. 相似文献
17.
S. I. Kolesnikov V. G. Gaivoronskii E. N. Rotina K. Sh. Kazeev V. F. Val’kov 《Eurasian Soil Science》2010,43(8):929-934
The effect of soil contamination with black oil added in amounts of 0.1, 0.5, 1.0, 2.5, 5, 10, 25, and 50% of the soil mass on the biological properties of ordinary and leached vertic chernozems, brown forest soils, and gray sands in the south of Russia was studied in a model laboratory experiment. It was shown that the soil contamination causes a drop in the catalase and dehydrogenase activities, the cellulolytic capacity, the number of Azotobacter bacteria, and the characteristics of the plant germination. The ordinary and vertic chernozems were more tolerant toward the contamination than the gray sands and brown forest soils. The changes in the biological soil properties in dependence on the degree of the soil contamination differed considerably for the soils with different properties (the chernozems, brown forest soil, and gray sands) and were similar for the soils with similar properties (the ordinary and vertic chernozems). One soil (the brown forest soil) could be more tolerant toward the contamination than another soil (the gray sands) at a given concentration of black oil (<2.5%) and less tolerant at another concentration of black oil (>2.5%). The ecologically safe levels of the soil contamination with black oil do not exceed 0.7% in the ordinary chernozems, 0.3% in the compact chernozems, 0.1% in the brown forest soils, and 0.06% in the gray sands. 相似文献
18.
Data on the fractional and group composition of humus in urban soils of Rostov-on-Don are discussed. We have compared the humus profiles of chernozems under tree plantations and those buried under anthropogenic deposits (including sealed chernozems under asphalt). It is shown that the type of humus in these soils remains stable despite a decrease in its total content after the long-term burial under asphalt. Under the impact of the trees, the organic matter of the chernozems acquired some features typical of gray forest soils, i.e., the humate-fulvate type of humus in the humus horizon and the sharp drop in the humus content down the soil profile. 相似文献
19.
V. A. Kholodov A. I. Konstantinov A. V. Kudryavtsev I. V. Perminova 《Eurasian Soil Science》2011,44(9):976-983
The structure of humic acids (HAs) in zonal soil types—soddy-podzolic soils (two samples), gray forest soil (one sample),
and chernozems (two samples)—was quantitatively studied by 13C NMR spectros-copy. In the series considered, the content of unsubstituted carbon in the aromatic fragments of HAs increased,
and the fraction of unsubstituted aliphatic structures decreased. HAs of soddy-podzolic soils were found to be enriched with
carbohydrate fragments compared to HAs of chernozems and gray forest soil. The carbon skeleton of HAs from typical rich chernozem
contained significantly more aliphatic and carbohydrate fragments compared to typical chernozem, which probably reflected
the lower degree of HA transformation in rich chernozem. 相似文献
20.
A. L. Alexandrovskii 《Eurasian Soil Science》2011,44(10):1055-1067
The soil evolution in the depression of Lake Nero was driven by climate changes in the Holocene and by the history of the relief’s development in this region. In the Alleröd period, dark-colored soils were formed; in the Late Dryas period, they were cryoturbated and covered by colluvial deposits from the adjacent slopes. These specific paleosols are found on relatively high ancient surfaces. In the Early and Middle Holocene (10000–3700 BP), dark-colored horizons of soils with high stability of the organic matter were formed. The properties of humus in these soils are close to the properties of humus in forest-steppe soils. In the past 3500–3700 years, under conditions of some cooling and humidization of the climate with the development of taiga pedogenesis, these soils have evolved into soddy-podzolic soils. Their dark-colored horizons have degraded, though their lower parts are partly preserved in many places as the second humus horizons, the most distinctive feature of the soil polygenesis in the studied region. The soils of the low terrace (100–103 m a.s.l.) are younger than the soils of the higher and more ancient surfaces. Their evolution followed the same stages, though the Alleröd paleosols have not been found on this surface. In the coastal zone, at the heights below 97 m a.s.l., the soil formation began later, about 7000 years ago. Afterwards, the soils of this surface were subjected to the influence of fluctuations in the lake’s level. During the regression phase (7000–3500 BP), which corresponded to the dark-colored pedogenesis, these soils and the habitation deposits of the Bronze Age were formed on the dried bottom of the lake below its modern lake level of 93.2 m a.s.l. In the Late Holocene, these soils in the coastal zone were subjected to waterlogging rather than to podzolization due to the rise in the lake’s level; they have evolved into the soddy gley soils. 相似文献