Agricultural impacts drive longitudinal variations of riverine water quality of the Aral Sea basin (Amu Darya and Syr Darya Rivers), Central Asia

Leng, Peifang; Zhang, Qiuying; Li, Fadong; Kulmatov, Rashid; Wang, Guoqin; Qiao, Yunfeng; Wang, Jianqi; Peng, Yu; Tian, Chao; Zhu, Nong; Hirwa, Hubert; Khasanov, Sayidjakhon

doi:10.1016/j.envpol.2021.117405

Cited by 41 publications

(24 citation statements)

References 64 publications

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“…The impact of climate change on agriculture, in particular, is high, as agriculture is one of the most weather-dependent sectors of the economy. The negative impact of climate change associated with rapid melting glaciers and extended drought periods has resulted in a significant decline in agricultural development, especially in the semi-arid regions of the world [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Soil Salinity Changes under the Climate Change in the Khorezm Region, Uzbekistan

Khamidov

Ishchanov

Hamidov

et al. 2022

IJERPH

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Soil salinity negatively affects plant growth and leads to soil degradation. Saline lands result in low agricultural productivity, affecting the well-being of farmers and the economic situation in the region. The prediction of soil salinization dynamics plays a crucial role in sustainable development of agricultural regions, in preserving the ecosystems, and in improving irrigation management practices. Accurate information through monitoring and evaluating the changes in soil salinity is essential for the development of strategies for agriculture productivity and efficient soil management. As part of an ex-ante analysis, we presented a comprehensive statistical framework for predicting soil salinity dynamics using the Homogeneity test and linear regression model. The framework was operationalized in the context of the Khorezm region of Uzbekistan, which suffers from high levels of soil salinity. The soil salinity trends and levels were projected under the impact of climate change from 2021 to 2050 and 2051 to 2100. The results show that the slightly saline soils would generally decrease (from 55.4% in 2050 to 52.4% by 2100 based on the homogeneity test; from 55.9% in 2050 to 54.5% by 2100 according to the linear regression model), but moderately saline soils would increase (from 31.2% in 2050 to 32.5% by 2100 based on the homogeneity test; from 31.2% in 2050 to 32.4% by 2100 according to the linear regression model). Moreover, highly saline soils would increase (from 13.4% in 2050 to 15.1% by 2100 based on the homogeneity test; from 12.9% in 2050 to 13.1% by 2100 according to the linear regression model). The results of this study provide an understanding that soil salinity depends on climate change and help the government to better plan future management strategies for the region.

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Section: Introductionmentioning

confidence: 99%

Assessment of Soil Salinity Changes under the Climate Change in the Khorezm Region, Uzbekistan

Khamidov

Ishchanov

Hamidov

et al. 2022

IJERPH

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“…There is practically no process in the soil in which the microflora would not take part. Microorganisms, as is known, can be used as an indicator for determining the directions of various processes in the soil and depends on the combination of soil formation conditions: topography, climate, parent rock, vegetation, chemical properties, etc [4,5]. The roots of plants growing on different types of soil salinity, as a result of altered metabolism, release substances into the external environment with unequal intensity and different biological significance for microorganisms.…”

Section: Introductionmentioning

confidence: 99%

“…Among the first works on the study of the microflora of the saline soils of Central Asia, studies should be attributed to studies in the saline soils of the Hunger Steppe, where microorganisms were found that take part in the nitrogen cycle -ammonifiers, denitrifiers, nitrogen fixers. Cellulosedestroying, sulfate-reducing bacteria, as well as fungi and actinomycetes were also detected [4,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Integral indicators of the ecological and biological state of soils in Jizzakh steppe, Uzbekistan

Makhkamova

Gafurova

Nabieva

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In the study of soil fertility, biological factors, especially the microbiological activity of soils, have recently attracted increasing attention. Agronomically important groups of microorganisms that participate in the nitrogen and carbon cycle play an important role in soil fertility. By the number of these organisms, it is possible to indicate the state of the soil and characterize the direction of the processes occurring in it. In this regard, it seemed to us necessary to carry out a quantitative account of the main physiological groups of microorganisms involved in the transformations of nitrogen- and carbon-containing substances. The studied area is included in the semi-desert serozem zone with its characteristic geomorphology, climate and vegetation cover. Agrochemical, agrophysical, physical and chemical properties and the sum of integral indicators of the ecological and biological state of soils, it makes it possible to determine the level of impact of their ecological and genetic properties, as well as natural and environmental factors on soil fertility and land degradation.

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“…The uncontrolled abstraction of water from the Syr Darya River for irrigation, coupled with the degradation of supporting drainage facilities, has resulted in widespread salinization of croplands. In addition, since irrigation areas in the upper and middle regions draw a large amount of runoff from the Syr Darya [8,9], the amount of water flowing into the Aral Sea is drastically reduced, leading to its rapid reduction in size and the emergence of a large, dry lake bottom [10]. Under the action of strong winds, a large amount of salt dust blows from the dry lake bottom and is then deposited on the soil surface [11,12], intensifying the local soil salinization process [13].…”

Section: Introductionmentioning

confidence: 99%

“…As one of the two major rivers in Central Asia, research on the ecological environmental changes of the Syr Darya River, and its basin, has always been a hot spot of current research. Many fruitful studies have been carried out on climate change and surface water hydrological processes [14,15]; water resources and management [8,16,17]; land cover and irrigation suitability evaluation [18,19]; and soil degradation and its environmental effects [20][21][22]. Among them, Konstantinovna and Zheksembaevna [23], in the study of soil degradation in the basin, found that by investigating land cover changes in the modern delta of the Syr Darya River, from 1956 to 2008, that the trend of soil salinization was more pronounced due to the shrinking of the Aral Sea and the effects of aridification.…”

Section: Introductionmentioning

confidence: 99%

Driving Factor Identification for the Spatial Distribution of Soil Salinity in the Irrigation Area of the Syr Darya River, Kazakhstan

Duan

Abuduwaili

et al. 2022

Agronomy

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Soil salinization has become a worldwide issue affecting agricultural development. Statistical methods and spatial analysis were used to analyze the degree and type of saline soils and their spatial distribution. The driving factors of soil salinity were explored using Geodetetcor models. In this study, 84 soil samples were collected from a 0–20 cm soil layer, and the total salt concentration and salt ion composition were measured. The results of statistical analysis and cluster analysis showed that SO42− and Ca2+ had the highest concentrations of salt ions in terms of anion and cation contents, respectively. The interpolation results indicated that the study area was dominated by mild saline soils, with sulfate-type saline soils and chloride-sulfate-type soils dominating. Results of the factor detector suggested that the distance to the irrigation system (0.425), and distance to the drainage system (0.42), explained salinity more strongly in the Shardara district, and elevation (0.326) was the most important influencing factor for salinity in the Mahtaaral district. Results of the interaction detector indicate that human factors (distance to irrigation canals ∩ distance to drainage canals) had a stronger explanation both in the Shardara and Mahtaaral districts. This research provides a scientific basis for soil salinity regulation and management, which is crucial for sustainable agricultural development.

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Agricultural impacts drive longitudinal variations of riverine water quality of the Aral Sea basin (Amu Darya and Syr Darya Rivers), Central Asia

Cited by 41 publications

References 64 publications

Assessment of Soil Salinity Changes under the Climate Change in the Khorezm Region, Uzbekistan

Assessment of Soil Salinity Changes under the Climate Change in the Khorezm Region, Uzbekistan

Integral indicators of the ecological and biological state of soils in Jizzakh steppe, Uzbekistan

Driving Factor Identification for the Spatial Distribution of Soil Salinity in the Irrigation Area of the Syr Darya River, Kazakhstan

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