Архив метки: fertility

SOILS OF ARID TERRITORIES IN THE CENTRAL PART OF KALMYKIA (ON THE EXAMPLE OF THE PRIYUTNENSKY DISTRICT)

Arid Ecosystems

UDC  631.412

Mukabenova R.A., Mandzhieva S.S., Adyanova A.B., Dzhimbeev N.V., Sayanov V.T., Buluktaev A.A. SOILS OF ARID TERRITORIES IN THE CENTRAL PART OF KALMYKIA (ON THE EXAMPLE OF THE PRIYUTNENSKY DISTRICT) // Arid Ecosystems. 2023. Vol. 29. № 4 (97). P. 73-80. | PDF

This article presents the characteristics of the soils of the Republic of Kalmykia on the example of the Priyutnensky district. Such indicators of soil fertility as organic matter, the reaction of the aqueous extract medium (hydrogen index – pH), salt composition and the degree of alkalinity of soils of 5 settlements of the Priyutnensky district of the Republic of Kalmykia were studied.. The content of organic carbon (Сorg) was studied by the method of I.V. Tyurin modified by V.N. Simakov (GOST 26213-91), pH of the soil solution by the potentiometric method (GOST 26483-85). The chemical composition of soils was studied by X-ray fluorescence spectroscopy using a MAKS — GV spectroscan. As a result of studies conducted on salt and light chestnut soils of the Priyutnensky district, the predominance of arable soils with low and very low organic matter content (less than 3.5%) was revealed. The reaction of the soil solution is slightly alkaline and alkaline. The soils are saline in the upper surface layer (0-20 cm), the content of exchangeable magnesium does not exceed 0.74%, the content of calcium is 0.96 %, carbonates are present. It has been established that minimum pH values are observed on the edge of settlements, maximum values are observed on the territory of an educational institution, or in the center of a settlement. The chloride content in the soils of the research objects was not the same. There was no pronounced dependence of other soil parameters in all settlements from the center to the background.

Keywords: fertility, salt composition, organic matter, cations, acidity.

Funding. The article was prepared within the framework of the state subsidy for the project «Asymmetrically developing territories facing traditional and new challenges: a study of the dynamics of socio-economic processes and the variability of the environmental situation» (state registration no. 122022700133-9).

DOI: 10.24412/1993-3916-2023-4-73-80

EDN: HWQWRM

DIFFERENTIATION OF SOIL PROCESSES BY STAGES OF THEIR DEVELOPMENT IN THE REGIONS OF THE ARID CLIMATE ZONE

Arid Ecosystems

UDC 631.48; 581.54

Alichaev M.M., Sultanova M.G., Musalaeva P.D. DIFFERENTIATION OF SOIL PROCESSES BY STAGES OF THEIR DEVELOPMENT IN THE REGIONS OF THE ARID CLIMATE ZONE // Arid Ecosystems. 2022. Vol. 28. № 4 (93). P. 46-54. | PDF

The modern processes of manifestation of the stages of desertification and arid degradation and the dynamics of their development depending on soil fertility in arid conditions are considered on the example of the regions of the Western Caspian – the Tersko-Kuma lowland and the Terek Delta. The development of degradation processes proceeds in two stages, fundamentally different in content and scale of territorial distribution.

The first stage – natural degradation — originates from the time of the development of soil formation processes in the Holocene as one of the indispensable elements of the functioning of living organisms on the Earth’s surface. The natural dynamics of degradation processes proceeds with the formation of an equilibrium state of soil formation with the formation of certain types of soils of a full-profile structure. Depending on the conditions of soil formation characteristic of the degradation direction, such as salinization, pollution, salinity of soils at different stages of their development, salt marshes, salt flats, sandy and clay deserts are formed. The development of these soil properties in natural conditions continues at the present time, their evolution proceeds, starting in the Holocene epoch (Akaev, 1996).

On the second stage the dynamics of arid degradation and desertification is caused by anthropogenic impact, radically different from the indicators of natural degradation. As a result of the increased anthropogenic impact, the natural state of the soil cover is replaced by an unstable secondary one in artificial conditions. The measures contributing to the formation of new directions of soil formation include: the expansion of irrigated land areas in the Terek Delta, the Tersko-Kuma lowland and in other regions, the vulnerability of developed soils to natural salinization phenomena, wind erosion and degradation.

Keywords: stages of soil origination, Holocene differentiation, anthropogenic differentiation, fertility, halophytes, arid degradation, geological time periods, historical time periods.

DOI: 10.24412/1993-3916-2022-4-46-54

EDN: XRHRDC

IMPACT OF ENVIRONMENTAL CONDITIONS ON THE SOIL PROCESSES OF THE HIGHLANDS OF DAGESTAN

Arid Ecosystems

Alichaev M.M., Sultanova M.G. IMPACT OF ENVIRONMENTAL CONDITIONS ON THE SOIL PROCESSES OF THE HIGHLANDS OF DAGESTAN // Arid ecosystems. 2021. V.27. № 3 (88). P. 61-65.

The article presents the materials of route, stationary soil, soil-ecological studies conducted in the high-mountain zone of Dagestan with the characteristic: a) the current features of the development of the soil cover; b) the ecological parameters of the soil cover and their changes under the influence of climate warming.

The variety of natural and economic conditions of the object of study caused a significant diversity of the soil cover. The distribution of the soil was greatly influenced by the height of the terrain, the exposure and the steepness of the slopes. Based on the soil erosion studies conducted in previous periods, it can be noted that improper land use and climate warming have led to radical changes in the composition of the soil cover in terms of determining indicators – soil erosion.

In recent years, the area of eroded land has doubled, the area with heavily eroded soils-by 1/3. This led to a decrease in the thickness of humus horizons in almost all soils to an average of 20 cm, and the loss of humus reserves in the soils amounted to 60% of the initial content. The presented analysis of the degradation of the soil cover and the established patterns of soil evolution on the slope lands of the highlands serve as a theoretical basis for the reproduction of soil fertility, the preservation of the ecological role of soil protection from erosion and other degradation processes.

Keywords: soil, fertility, erosion, exposure, highlands, vegetation, ecology, pastures, elevation.

Funding. This work was carried out within the state assignment No. 0733-2019-0005 “To Develop an Assessment System for Modern Trends of Soil Processes Development in Natural Landscapes of the Mountainous Province of the Republic of Dagestan”.

DOI: 10.24411/1993-3916-2021-10164

CHERNOZEMS OF WESTERN TRANSBAIKAL: DISTRIBUTION, FERTILITY ELEMENTS, ORGANIC MATTER, HUMUS, CROPS

Arid Ecosystems

Chimitdorzhieva G.D. CHERNOZEMS OF WESTERN TRANSBAIKAL: DISTRIBUTION, FERTILITY ELEMENTS, ORGANIC MATTER, HUMUS, CROPS // Arid ecosystems. 2020. V. 26. № 4 (85). P. 136-143. | PDF

The chernozems of Transbaikal, along with chestnut soils, are intensively used in agriculture of the region. Their humus level is low (4.2%), they have a light particle size distribution and are spreading in patches, mostly on the various slopes, and are subject to deflation. Their biological activity is low due to their deep level of freezing (4 m) and slow thawing. The microorganisms are distributed only in their surface layers. The amounts of annual fresh organic matter are low, their destruction is slow. Humus is fulvic-humate with a high content of non-hydrolyzable residue (48%). The harvest of spring wheat in the farms of the region is 12-13 cwt/ha. Only by application of the sparing agriculture and adaptive land management methods, the harvest can be increased up to 21 cwt/ha.

Keywords: chernozems, organic matter, humus, fertility, West Baikal Region.

DOI: 10.24411/1993-3916-2020-10128