Current state of humus in irrigated meadow-brown soils in the Republic of Armenia

Ghazaryan, H. Gh.; Kroyan, S.Z.; Manukyan, N.M.; Kalashian, M. Yu

doi:10.1016/j.aasci.2016.10.004

Cited by 7 publications

(8 citation statements)

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“…In addition, aggregate stability reached its peak level during completely thawed period. It is possible that the warmer temperatures and increased biological activities promote the decomposition of organic matter, resulting in higher levels of litter and humus during summer completely thawed period (Ghazaryan et al 2016). Humus is an important cementing substance for the formation of aggregate and its increased content facilitates the formation and stability of aggregate (Erktan et al 2016).…”

Section: Effects Of the Freeze-thaw Cycles On The Soil Aggregate Stab...mentioning

confidence: 99%

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Dong,

Gu,

Jia

et al. 2023

Environ. Res. Commun.

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As the basic units of soil structure, soil aggregate are essential for maintaining soil stability. Intensified freeze-thaw cycles have deeply affected the size distribution and stability of aggregate under global warming. To date, we are still lacking about the effect of freeze-thaw cycles on aggregate in the permafrost regions of the Qinghai-Tibetan Plateau (QTP). Therefore, we investigated the effects of diurnal freeze-thaw cycles and seasonal freeze-thaw processes on soil aggregate by in-situ studies. Our results showed that the durations of thawing and freezing periods in the 0-10 cm soil layer were longer than in the 10-20 cm soil layer, while the opposite for completely thawed and frozen periods. Freeze-thaw strength was greater in the 0-10 cm layer than that in the 10-20 cm layer. The diurnal freeze-thaw cycles might not have significant effect on the size distribution and stability of aggregate. However, < 0.25 mm fraction dominated wet sieving aggregate with the highest proportion during the thawing period, while the proportions of 0.5-1 mm and 1-3 mm fractions reached the highest during the completely frozen period in the 0-20 cm layer (P < 0.05). Likewise, the mean weight diameter and water-stable aggregate were decreased during the thawing period compared with other periods, which were influenced by soil microbial biomass carbon and belowground biomass. Hence, the seasonal freeze-thaw processes destroyed macro-aggregate (> 0.25 mm) and reduced aggregate stability. Our study has a scientific guidance for evaluating the effects of freeze-thaw cycles on aggregate and provides a theoretical basis for further exploration on soil and water conservation in the permafrost regions of the QTP.

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Section: Effects Of the Freeze-thaw Cycles On The Soil Aggregate Stab...mentioning

confidence: 99%

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Dong,

Gu,

Jia

et al. 2023

Environ. Res. Commun.

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“…The chestnut and light-brown soils are different in morphology, clay fraction chemistry, mineralogy and are supposed to be very different in content, distribution, and composition of soil organic matter [9]. The high humus content in black-brown soils is attributed to the continuous organic matter input from the forest litter or grasses [6,7]. There are also evidences in the literature that the loss of humus in the depths of arable horizon in the Issyk-Kul region of Kyrgyzstan from 1972 to 2000 ranged from 19 to 57%, depending on the degree of erosion [5].…”

Section: Resultsmentioning

confidence: 99%

Changes in humus content on the territory of agricultural lands in the Issyk-Kul basin of Kyrgyzstan

Kurenkeev,

Sariyeva,

Asanbekova

et al. 2024

BIO Web Conf.

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The Issyk-Kul valley of Kyrgyzstan has very large diversity of soil types which is developed by complex of abiotic and biotic factors including mountain-valley landscapes and different climatic conditions. We found that there is a process of significant loss of humus content in almost all studied areas of the Issyk-Kul region, both in the upper and lower layers of the soil. The humus content has been significantly decreased in the upper layer of valley soils during the past four decades. Among them, mountain-valley chestnut and dark chestnut soils, represented in the Issyk-Kul region, showed themselves to be the most depleted. Here, the difference in humus content between the top arable and non-arable layers is 40%. More stable humus content is shown in the mountain light chestnut and mountain-valley light brown soils, presented in certain areas of the Ton, Ak-Suu and Tyup districts. Apparently significant decrease in the humus content in chestnut soils is associated with intensive long-term anthropogenic use, including non-compliance with agrotechnical standards.

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“…Human-induced changes in the organic matter of the dark chestnut soils of Northern Kazakhstan were studied by A. K. Kurishbayev et al [16], the current humic condition of the irrigated meadow-brown soils in the Republic of Armeniaby H. Gh. Ghazaryan et al [17], changes in the conditions of humus formation in the typical black soils of the Northern part of the Republic of Moldova under the influence of irrigation were studied by I. Senikovskaya and V. Filipchiuk [18], the content of organic carbon, total nitrogen and dissolved fractions of soil organic matter in the Chersky meadows (Republic of Poland) in the conditions of long-term irrigation (over 150 years) by A. Dziamski, M. Banach-Szott, B. Dębska [19], changes in the structure of humus and microbial cenoses in deflated chestnut soils of Western Transbaikaliaby M. G. Merkusheva and S. B. Sosorova [20], and the content of humus in the long irrigated soils of the Akdalinsky and Chiiliysky massifs in the southern Kazakhstan -by M. A. Ibraeva, A. Otarov, B. Wiłkomirski, M. Suska-Malawska [21].…”

Section: Literature Reviewmentioning

confidence: 99%

The Effect of Prolonged Irrigation on the Dry Steppe Soilsâ€™ Fertility in the Volga Region

Pronko¹,

Koršak²,

Romanova³

et al. 2018

IJET

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The article deals with the negative effect of the prolonged irrigation on the contents and quality of humus, and plant nutrients’ stock in the soil. The research was aimed at studying the nature and regularities of the transformation of organic matter (humus) and nutrients in the dark chestnut soil of dry steppe zone in the Volga region in the process of irrigation over half a century long. Field and laboratory experiments, as well as theoretical methods, such as mathematical statistics were used for studying the soil agrochemical properties. The research has shown that humus mineralization in irrigated soils is more pronounced, compared to nonirrigated soils, dehumification increases with increasing the period of irrigation and intensification of agriculture; the content and stock of humus decreases with irrigation, and is accompanied by the negative changes in its qualitative composition. The article describes the reasons for dehumification and negative changes in the qualitative composition of humus in the dark chestnut soils: deficient nitrogen balance due to insufficient use of nitrogen fertilizers, which resulted in the destruction of the organic matter in the soil, increased share of tilled crops in the crop structure, absence of nitrogen-fixing ability in alfalfa due to significant soil compaction, and insufficient introduction of organic fertilizers. The found peculiarities of dehumification and reduction of nutrients availability in the soil, which are the most dangerous degradation processes in the soils of the region that reduce the efficiency of irrigated agriculture, are required for developing substantiated solutions for preventing dehumification, restoring the fertility of irrigated soils, and reducing deficiency of foodstuffs in arid regions.

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Current state of humus in irrigated meadow-brown soils in the Republic of Armenia

Cited by 7 publications

References 0 publications

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Changes in humus content on the territory of agricultural lands in the Issyk-Kul basin of Kyrgyzstan

The Effect of Prolonged Irrigation on the Dry Steppe Soilsâ€™ Fertility in the Volga Region

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