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DocumentMechanical soil conservation strategies to reduce soil erosion in Dominica 2014
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No results found.In Dominica, natural disasters, such as storms and heavy rainfalls, regularly occur and have a direct impact on its agricultural sector. Therefore, mechanical soil conservation strategies are important management practices for crop production. These strategies use methodologies that include the use of bunds, terraces, waterways / drainage channels, and other structures, for example vegetative barriers, or stone / rock lines. Thereby, the structures are so installed as to break the force of winds or decrease the velocity of runoff to reduce soil erosion. Barriers can be constructed with live material, such as plants, dead material, such as rocks, or with a mixture of both materials. For an illustration of different on-farm erosion control strategies see the pictures attached to this practice. -
DocumentEstablishing grass barriers along the contour to reduce water runoff and erosion during heavy rainfall, Grenada 2012
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No results found.The agricultural sector in Caribbean islands such as Grenada is extremely vulnerable to storms and hurricanes. Establishing grass barriers along the contour can help in reducing water runoff and erosion during heavy rainfall. Grass barriers provide erosion control on croplands and offer a cheaper and more sustainable alternative to terraces in areas where soil degradation is highly likely. This system reduces surface runoff by promoting detention and infiltration, diverts runoff to a stable outlet and helps entrapping sediment-borne and soluble contaminants. This practice describes how to establish a grass barrier. -
ArticleShort-term effects of forest fire on soil erosion in Korea: Case study of 2020 Andong forestfire
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Forest fire can devastate forest landscape. After the fire excessive runoff and soil erosion might occur, thus turning once fully functional forestland into degraded forest without topsoil and nutrients. It is important understand how soil erosion changes and burned area recovers with time. This study accessed the short-term effects of forest fire on soil erosion by monitoring sediment yields during wet summer season after a fire, using a total of twelve 5m x 10m silt fences from canopy fire, ground fire, and control areas (no fire) in Andong where 2020 hectares of forestland were burned in April of 2020. All silt fences were located at east-facing hillslopes with 45–55% steepness and conifers. The soil texture of canopy and ground fire areas was sandy loam, and control area was loam. The four sediment observations were made during the monitoring: An average of 158.0 kg ha-1 from canopy fire area, 0 kg ha-1 from ground fire area and 0 kg ha-1 from control area with accumulated rainfall of 53.0 mm (on 7/4); 1,077.5, 28.4, and 8.3 kg ha-1 with 174.5 mm (7/17); 1800.0, 116.7, and 3.2 kg ha-1 with 275.5 mm (8/4–5); 2340.0, 22.0, and 27.5 kg ha-1 with 226.5 mm (8/25); 580.0, 1.9, and 0.7 kg ha-1 with 156.8 mm (9/14&16); and 12.3, 2.3, and 0.5 kg ha-1 with 3.1 mm (10/5–6). The results indicated extremely high soil erosion occurred from canopy fire area and minimal erosion occurred from ground fire and control areas where no significant difference was found. Conifers defoliated due to stress from ground fire and fallen needles provided ground cover, thus preventing soil erosion. The ground covers measured from canopy fire, ground fire and control areas were 27.5%, 82.4% and 99.7% on 7/3 and 59.9%, 85.5% and 99.1% on 10/5, showing a large difference between canopy and ground fire areas with conifers. This study showed the importance of ground cover to mitigate post-fire erosion, and erosion control measures, such as mulching, should be considered to increase ground cover. Keywords: forest fire; ground cover; postfire soil erosion; sediment; silt fence ID: 3486822
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