Managing Sands of the Lower Mekong Basin to Limit Land Degradation: A Review of Properties and Limitations for Crop and Forage Production

Land development is rapidly occurring on sand-dominant soils that cover substantial areas of the Lower Mekong Basin (LMB). Sands are at risk of degradation on sloping uplands where agriculture is expanding and on lowland landscapes where intensification of cropping is occurring. Sandstone and granit...

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Vydáno v:Soil systems Ročník 6; číslo 3; s. 58
Hlavní autoři: Bell, Richard W., Seng, Vang, Vance, Wendy H., Philp, Joshua N. M., Hin, Sarith, Touch, Veasna, Denton, Matthew D.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Basel MDPI AG 29.06.2022
Témata:
Acidity
Agricultural conservation
agricultural conservation practice
Agriculture
Arenosol
basins
Cambodia
Cassava
Cereal crops
Conservation tillage
Corn
Crop production
Crop residues
Crops
Drought
Economics
Farming systems
fertilizers
Forage
forage production
Geology
Hardpan soils
Harvesting
Highlands
Land area
Land degradation
Land development
land suitability
Land use
land use change
Laos
Leaching
Lowlands
minimum tillage
nutrient deficiencies
Nutrient loss
Nutrient status
Organic matter
Permeability
Profitability
rain
Rainfall
Rainy season
Rice
risk
Rooting
Sand
Sandstone
Sediments
Soil conservation
Soil erosion
Soil fertility
Soil lime
Soil organic matter
Soil permeability
soil pH
soil–water
Stone
subsoil
Subsoils
Sustainable use
Water balance
Waterlogging
wet season
Cambodia
Thailand
Laos
ISSN:2571-8789, 2571-8789
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Abstract Land development is rapidly occurring on sand-dominant soils that cover substantial areas of the Lower Mekong Basin (LMB). Sands are at risk of degradation on sloping uplands where agriculture is expanding and on lowland landscapes where intensification of cropping is occurring. Sandstone and granitic geology explain the prevalence of sand-dominant textures of profiles in the LMB. However, the sand terrains in uplands of Cambodia and Southern Laos mostly have not been mapped in detail and the diversity of their edaphic properties is poorly understood. On high-permeability sands, lowland rainfed rice crops are drought-prone, while nutrient losses from leaching are also a risk. Furthermore, waterlogging, inundation and subsoil hardpans are significant hazards that influence the choice of crops and forages for lowland soils. Soil acidity, low nutrient status, hard-setting and shallow rooting depth are significant constraints for crops and forages on sands in the lowlands. Land use change in the lowlands to alternative field crops and forages on sands is contingent on their profitability relative to rice, the amounts and reliability of early wet season rainfall, and the amounts of stored water available after harvesting rice. Low soil fertility and soil acidity are limitations to the productivity of farming systems on the sand profiles in uplands, while erosion, low soil organic matter levels and water balance are concerns for their sustainable use. Site-/soil-specific fertilizer and lime management, land suitability assessment and the use of conservation agriculture principles (minimum tillage and crop residue retention) can overcome some of these constraints.
AbstractList Land development is rapidly occurring on sand-dominant soils that cover substantial areas of the Lower Mekong Basin (LMB). Sands are at risk of degradation on sloping uplands where agriculture is expanding and on lowland landscapes where intensification of cropping is occurring. Sandstone and granitic geology explain the prevalence of sand-dominant textures of profiles in the LMB. However, the sand terrains in uplands of Cambodia and Southern Laos mostly have not been mapped in detail and the diversity of their edaphic properties is poorly understood. On high-permeability sands, lowland rainfed rice crops are drought-prone, while nutrient losses from leaching are also a risk. Furthermore, waterlogging, inundation and subsoil hardpans are significant hazards that influence the choice of crops and forages for lowland soils. Soil acidity, low nutrient status, hard-setting and shallow rooting depth are significant constraints for crops and forages on sands in the lowlands. Land use change in the lowlands to alternative field crops and forages on sands is contingent on their profitability relative to rice, the amounts and reliability of early wet season rainfall, and the amounts of stored water available after harvesting rice. Low soil fertility and soil acidity are limitations to the productivity of farming systems on the sand profiles in uplands, while erosion, low soil organic matter levels and water balance are concerns for their sustainable use. Site-/soil-specific fertilizer and lime management, land suitability assessment and the use of conservation agriculture principles (minimum tillage and crop residue retention) can overcome some of these constraints.
Author Seng, Vang
Touch, Veasna
Philp, Joshua N. M.
Bell, Richard W.
Hin, Sarith
Vance, Wendy H.
Denton, Matthew D.
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CitedBy_id crossref_primary_10_1007_s10457_025_01213_9
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Snippet Land development is rapidly occurring on sand-dominant soils that cover substantial areas of the Lower Mekong Basin (LMB). Sands are at risk of degradation on...
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SubjectTerms Acidity
Agricultural conservation
agricultural conservation practice
Agriculture
Arenosol
basins
Cambodia
Cassava
Cereal crops
Conservation tillage
Corn
Crop production
Crop residues
Crops
Drought
Economics
Farming systems
fertilizers
Forage
forage production
Geology
Hardpan soils
Harvesting
Highlands
Land area
Land degradation
Land development
land suitability
Land use
land use change
Laos
Leaching
Lowlands
minimum tillage
nutrient deficiencies
Nutrient loss
Nutrient status
Organic matter
Permeability
Profitability
rain
Rainfall
Rainy season
Rice
risk
Rooting
Sand
Sandstone
Sediments
Soil conservation
Soil erosion
Soil fertility
Soil lime
Soil organic matter
Soil permeability
soil pH
soil–water
Stone
subsoil
Subsoils
Sustainable use
Water balance
Waterlogging
wet season
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Title Managing Sands of the Lower Mekong Basin to Limit Land Degradation: A Review of Properties and Limitations for Crop and Forage Production
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