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All Journal Journal of Degraded and Mining Lands Management
Trung, Ta Hoang
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Assessing long-term land use/land cover changes in Dong Thap Province, Upper Vietnamese Mekong Delta: A 33-year retrospective using satellite data Nguyen, Ho; Trung, Ta Hoang; Dinh, Tran The
Journal of Degraded and Mining Lands Management Vol. 13 No. 1 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.131.9131

Abstract

The Vietnamese Mekong Delta (VMD), Vietnam's “rice bowl”, is a vital agricultural hub due to its extensive network of rivers and fertile floodplains. This study evaluates land use/land cover (LULC) changes in the Upper Delta - Dong Thap Province from 1990 to 2023, using Landsat imagery and random forest algorithms. LULC maps were analyzed across five classes: cropland, wetlands, permanent crops, built-up areas, and open water. We monitored these classes at three points: 1990, 2005, and 2023, noting improvements in classification accuracy from 89% in 1990 to 94% in 2023. Significant transformations were observed; from 1990 to 2005, the most extensive change was the conversion of 477.32 km² of wetlands to cropland. Conversely, the minimal change involved only 0.55 km²  of open water area converted to built-up areas. Between 2005 and 2023, transitions from cropland to permanent crops dominated, peaking at 242.03 km². Over the three decades, the province experienced substantial shifts in LULC, primarily from wetlands to croplands, totaling 513.24 km². These changes reflect both natural dynamics and human impacts, underscoring the influence of past policies on land development. This longitudinal study provides crucial insights for policymakers, emphasizing the need for informed, sustainable land management strategies in Dong Thap Province.
Assessment of the soil chemical properties on the intensive coffee plantations in the Central Highlands, Vietnam Ky, Nguyen Vu; Trung, Ta Hoang; Anh, Pham Lan; Long, Hoang Hai; Truc, Dinh Thi Nha; Anh, Nguyen Huy
Journal of Degraded and Mining Lands Management Vol. 13 No. 1 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.131.9415

Abstract

The soil chemical properties in coffee-growing areas were important factors determining the growth, productivity, quality, and coffee flavour of Vietnam’s coffee. This study evaluated the soil chemical characteristics of intensive coffee lands in the four major coffee-producing provinces of the Central Highlands. A total of 1,095 soil samples were collected over a two-year period (from 2022 to 2023) within the coffee canopy to a depth of 30 cm for Robusta coffee. Chemical properties analyses were conducted at the Central Laboratory of the Western Highlands of Agriculture and Forestry Science Institute (WASI), focusing on five parameters: soil pH, organic matter, total nitrogen, available phosphorus, and available potassium. Results indicated that the coffee cultivation soils exhibited a high acidic pH value, with an average pH of 4.06. Organic matter content was generally high (4.25-5.40%), and total nitrogen fluctuated around the threshold of 0.19%. Available phosphorus was the most imbalanced nutrient, with excessive accumulation in Gia Lai, Dak Lak, and Lam Dong, while available potassium exhibited greater variability. Long-term monitoring (1994-2023) revealed a trend of gradual acidification over time under intensive coffee cultivation conditions. There was a significant accumulation of macronutrients, including total nitrogen, available phosphorus, and potassium, which raised signal inefficiencies in fertilizer management and increased risks of soil degradation and environmental pollution.
Co-Authors Anh, Nguyen Huy Anh, Pham Lan Dinh, Tran The Ky, Nguyen Vu Long, Hoang Hai Nguyen, Ho Truc, Dinh Thi Nha