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Pham, Cam Nhung
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Content of heavy metals in soils of Bidoup Nui Ba National Park (Southern Vietnam) Pham, Cam Nhung; Lebedev , Yaroslav; Drygval, Anna; Gorbunov , Roman; Gorbunova, Tatiana; Kuznetsov, Andrey; Kuznetsova, Svetlana; Nguyen, Dang Hoi; Tabunshchik, Vladimir
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6413

Abstract

The study of technogenic pollution of soils with heavy metals (HM) is an essential task for ecology. The analysis of the content of HMs in the park's soils shows the degree of pollution and the sources of its occurrence. The study of the elemental composition of soils is an objective method for assessing the state of the ecosystem. To determine the current state of heavy metal contamination in forest soils, the concentrations of their total forms were analyzed. Heavy metals, including Zn, Pb, Cr, Cu, Hg, Cd, and As, were found in the study area. In addition, the threat of contamination with Cd and As has been identified. The calculation of the total pollution coefficient allows us to assess the level of pollution for the dry season (Zc = 18.45-28.24, average 22.45) as average (moderately hazardous) and for the wet season (Zc = 0.01-5.11, average 1.96) as permissible. This indicates an unfavorable environmental situation. The content of heavy metals in soils depends on the season. Observations show that at the end of the wet season, the concentration of heavy metals decreases, while it increases in the period after the dry season. 
Assessment of soil pollution in coastal landscapes of the Republic of Djibouti and ecological risks Nikiforova, Aleksandra; Pham, Cam Nhung; Chernyi, Georgii; Tabunshchik, Vladimir; Daher, Abdourahman; Cheik, Sougueh; Gorbunov , Roman; Gorbunova, Tatiana; Repetskaya, Anna
Journal of Degraded and Mining Lands Management Vol. 12 No. 1 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.121.6579

Abstract

Tropical ecosystems play an important role in the environment. Coastal areas are subjected to a wide range of impacts and pollution, which have drawn worldwide attention over the past few decades. Comprehensive studies of heavy metal content in soils worldwide are extremely important for assessing and predicting ecological risks. Very few studies have been devoted to a complete study of the physicochemical characteristics of soils, assessment of heavy metal accumulation in coastal zones along the Djibouti coast, and potential ecological risks. The study investigated the physico-chemical characteristics of soil, assessed the accumulation of heavy metals in coastal zones along the Djibouti coast, and analyzed the potential environmental risks associated with the presence of heavy metals in the studied soils. Analysis of heavy metals and trace elements in the soils of the coastal areas of Djibouti revealed that the levels of these elements are lower than in soils of the Red Sea coast and are in line with WHO and other international standards. All heavy metals in the soil of the studied area demonstrate low levels of potential ecological risk. The soils of the studied areas, overall, have not undergone significant heavy metal pollution and can be considered suitable for various types of use.
Features of seasonal biogeochemical element migration in the "soil-plant" system: A case study of Bambusoideae in the Bidoup-Nui Ba National Park (Central Vietnam) Pham, Cam Nhung; Lebedev, Yaroslav; Drygval , Anna; Gorbunov, Roman; Gorbunova, Tatiana; Kuznetsov, Andrei; Kuznetsova, Svetlana; Nguyen, Dang Hoi
Journal of Degraded and Mining Lands Management Vol. 12 No. 1 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.121.6865

Abstract

The article presents unique research conducted in Bidoup-Nui Ba National Park, Vietnam, focusing on the biogeochemical element migration in soil and plants. The study aimed to identify element content changes, biological accumulation, and biogeochemical mobility during wet and dry seasons across different landscape conditions. The research revealed the active elements involved in migration and accumulation, assessed mobility and accumulation in bamboo organs, and highlighted the peculiarities within the "soil-plant" system. The study found that the uptake of certain microelements by plants is influenced by landscape facies and moisture conditions. For example, Zn, Cu, and Co were introduced through plant litter during the wet season and accumulated, while Mo accumulation was more pronounced in the dry season. Furthermore, the research observed variations in biological uptake by bamboo organs, with different landscape conditions and seasons playing a role. The biogeochemical mobility of elements in bamboo organs increased significantly with soil moisture during the wet season. Overall, the research provided insights into element accumulation and biogeochemical migration. Notably, the accumulation of element B was found to increase with soil moisture, while its reduction was associated with slope process activation during the wet season.
Assessment of groundwater contamination risk and seasonal dynamics of microelement composition in groundwater: A case study from the Karadag State Nature Reserve, Crimean Peninsula Pham, Cam Nhung; Lapchenko, Vladimir; Lapchenko, Elena; Tabunshchik, Vladimir
Journal of Degraded and Mining Lands Management Vol. 12 No. 3 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.123.7443

Abstract

The chemical composition of the water was determined to obtain a general picture of the geographical distribution of elements and identify the peculiarities of the elemental and chemical composition of groundwater. The analysis of heavy metal concentrations in the four wells, situated within the territory of the Karadag Reserve, revealed seasonal variations. An increase in macroelement concentrations was observed during winter, while their levels decreased during summer. The concentrations of microelements such as B (boron) and Fe (iron) decreased with increasing distance from the sea during winter and increased during summer. The analysis also identified significant exceedances of the maximum permissible concentrations (MPC) for heavy metals Li, B, Mg, Ca, Fe, Ni, and Br, as well as occasional exceedances of sodium and manganese concentrations. For all elements, the contamination factor (CF) was calculated. Based on the CF values, the pollution load index (PLI) was calculated to assess the degree of pollution by the studied elements. The results indicate the absence of pollution in the investigated area, both in summer and winter periods. To determine the degree of anthropogenic pollution by elements, the geoaccumulation index (Igeo) was calculated. Most of the studied elements do not indicate pollution either in summer or winter. However, the Igeo values for calcium indicate a moderate level of pollution during summer and a higher level during winter. The overall analysis of the results suggests that there is no serious groundwater pollution issue in the studied area by the analyzed elements.
Assessing the impact of anthropogenic and natural factors on soil-related ecosystem services: a case study of the coastal landscape of Djibouti Nikiforova, Aleksandra; Tabunshchik, Vladimir; Pham, Cam Nhung; Chernyi, Georgii; Lineva, Nastasia; Gorbunov , Roman; Gorbunova, Tatiana; Repetskaya, Anna
Journal of Degraded and Mining Lands Management Vol. 12 No. 4 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.124.8335

Abstract

Coastal regions are highly sought after for human habitation, exhibiting a population density that is threefold greater than the global mean. These zones are pivotal for environmental resources, human prosperity, and economic activities, providing a suite of services. The concept of ecosystem services has garnered international focus for its contribution to sustainable development. These services represent the myriad benefits that ecosystems confer, meeting socio-economic demands and enhancing human welfare. This analysis endeavors to appraise the value of ecosystem services in coastal areas, with a particular emphasis on the physicochemical properties of soils along Djibouti's coastline. It incorporates an assessment of local characteristics, climatic conditions, and the anthropogenic influence on the environment. Despite facing considerable threats to its biodiversity, Djibouti's coastline offers a plethora of vital ecosystem services to its inhabitants. Among the regulatory services rendered by these locales are air quality management, erosion mitigation, soil and sediment retention, climate and microclimate stabilization, carbon storage and sequestration, nutrient recycling, and facilitation of pollination.
Concentrations of labile heavy metal forms in soils of Bidoup Nui Ba National Park, Southern Vietnam Pham, Cam Nhung; Lebedev, Yaroslav O.; Drygval, Anna V.; Gorbunov, Roman V.; Gorbunova, Tatyana Yu.; Kuznetsov, Andrey N.; Kuznetsova, Svetlana P.; Nguyen, Dang Hoi; Tabunshchik, Vladimir A.; Ngo, Trung Dung
Journal of Degraded and Mining Lands Management Vol. 13 No. 4 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.134.11121

Abstract

An assessment of the content of mobile (labile) forms of heavy metals (HMs) – As, Hg, Cr, Zn, Cd, Pb, Cu – in the soils of Bidoup-Nui Ba National Park (Lam Dong Province, Vietnam) was conducted. The study was carried out on a key site representing a catena in a tropical forest with a predominance of yellow ferrallitic soils. Samples were collected in the dry and wet seasons from various genetic horizons. All analyzed elements were detected in all samples. A clear seasonal pattern emerged from our data: concentrations of labile heavy metal forms were consistently elevated during the dry period compared to the wet season, with differences reaching up to 10-fold for certain elements. Exceedances of Russian MPC standards for mobile forms were noted for lead (Pb) in four samples (up to 13.1 mg/kg) and for zinc (Zn) in three samples (up to 100.97 mg/kg) in the dry season. Calculated hazard coefficients (K?) showed that in the dry season, the potential environmental hazard associated with mobile forms of Pb and Zn is higher (average K? = 0.76 and 0.98, respectively) than in the wet season (average K? = 0.29 and 0.16). High positive correlations were found between the contents of all studied HMs in mobile form (r = 0.83-0.97), indicating their coupled migration and possibly common sources of input or accumulation conditions. The obtained data characterize for the first time the ecological and geochemical state of the soils of this protected natural area in terms of the content of bioavailable forms of HMs. The results indicate the need for monitoring mobile forms of HMs even in background territories, as their accumulation, especially in the dry season, can create potential environmental risks due to inclusion in trophic chains.
Assessment of the current ecological state and soil fertility level in the territory of the Tavrida Art Cluster (Kapsel Bay Catchment Basin) Repetskaya, Anna; Rudyk, Aleksandr; Nikiforova, Aleksandra; Tabunshchik, Vladimir; Pham, Cam Nhung
Journal of Degraded and Mining Lands Management Vol. 13 No. 4 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.134.11263

Abstract

This study presents a comprehensive assessment of the agrochemical, physicochemical, and ecological properties of soils within the Tavrida Art Cluster (Kapsel Bay catchment, Southeastern Crimea). The research was based on field descriptions of soil profiles and laboratory analyses of 19 samples collected from several depth intervals in November 2024. Key fertility indicators were determined, including pH in water suspension, organic matter content, nitrate nitrogen, available phosphorus and potassium, particle?size distribution, and salinity level. The soils were found to be characterised by alkaline pH (7.5-8.4), extremely low nitrate nitrogen (below the detection limit in 89.5% of samples), acute available phosphorus deficiency (63.2% of samples ?1.5?mg/100?g), and low organic matter content (75% of samples <3.0%). The heavy texture, with a physical clay fraction of 45-75%, exacerbates these adverse properties. An original integrated fertility index (IFI) was developed for a comprehensive evaluation; its mean value was 1.58 out of 5.0, indicating extremely low agricultural potential. The observed properties are shown to represent the natural geochemical background formed on carbonate parent materials under an arid climate, rather than being a consequence of anthropogenic degradation. A strategy for adaptive landscaping is proposed, based on targeted soil amelioration, selection of native xerophytes, and preservation of the territory’s natural ecological framework.
Co-Authors Cheik, Sougueh Chernyi, Georgii Daher, Abdourahman Drygval , Anna Drygval, Anna Drygval, Anna V. Gorbunov , Roman Gorbunov, Roman Gorbunov, Roman V. Gorbunova, Tatiana Gorbunova, Tatyana Yu. Kuznetsov, Andrei Kuznetsov, Andrey Kuznetsov, Andrey N. Kuznetsova, Svetlana Kuznetsova, Svetlana P. Lapchenko, Elena Lapchenko, Vladimir Lebedev , Yaroslav Lebedev, Yaroslav Lebedev, Yaroslav O. Lineva, Nastasia Ngo, Trung Dung Nguyen, Dang Hoi Nikiforova, Aleksandra Repetskaya, Anna Rudyk, Aleksandr Tabunshchik, Vladimir Tabunshchik, Vladimir A.