Thumbnail Image

Effects of water harvesting techniques on soil properties and water management (with focus on Tunisia)






Also available in:
No results found.

Related items

Showing items related by metadata.

  • Thumbnail Image
    Document
    Soil and Water Conservation with a focus on Water Harvesting and Soil Moisture Retention: a study guide for FFS 2003
    Also available in:
    No results found.

    In Sub-Sahara Africa, majority of the population derives its livelihood from agriculture. Smallholder agriculture accounts for 75% of agricultural production of which the majority constitutes of rainfed farming. Drought is Africa’s principal form of natural disaster which often it affects rainfed agriculture dramatically. The impact of population growth in rural areas is pushing communities into unsustainable farming practices such as burning and razing of tropical forests in order to plant crop s, planting in steep slopes, moving into fragile marginal eco-system, over cropping and over grazing – and subsequent depletion – of fragile arable land and over-utilization of ground water resources.
  • Thumbnail Image
    Article
    Effects of land use and land use change on soil properties in northeast rainforest landscapes of Madagascar
    XV World Forestry Congress, 2-6 May 2022
    2022
    Also available in:
    No results found.

    Soil is a major natural resource acting as a key interface between climate and biogeochemical systems. Tavy system or slash-and-burn agriculture influences soil quality and is responsible for releases of carbon stored in the soil. This study aims to evaluate soil properties in each land use and to determine the impact of land use change on these soil properties. The study area was located in an area in the rainforest of northeastern of Madagascar. Soil samples were collected on 135 study sites composed of nine land use types including natural forest, three cropland stages, tree fallow, mixed fallow, grassland and two cash crop plantations (vanilla and coffee). Mid-Infrared Spectroscopy (MIRS) was used to estimate organic carbon (C org), total nitrogen (N tot), cation exchange capacity (CEC), soil texture and pH KCl, while available phosphorus (P Olsen), soil bulk density (BD) and soil carbon stock (SOC) for 0-30 cm and 0-100 cm were estimated with conventional methods. At plot scale and at 0-30 cm, soil in the study area relevant highly variability. Statistical analysis shows that land use change in tavy system contributes significantly to this variability with a p-value <0.001 for P Olsen, C org and N tot, p-value < 0.01 for pH KCl and p-value < 0.05 for CEC and BD. Soil nutrients (P Olsen, C org and N tot) decrease during cultivation period and increase during fallow periods. The CEC and pH KCl were stable but decline rapidly at the grassland stage. SOC for both depths declines over two periods: after the first cropland and the third cycle of cropland after deforestation. The presence of tree vegetation in cash crops (vanilla and coffee) maintains a mean value of soil properties. The results presented in this study will be useful for forest landscape management and will allow the integration of the soil pool in the accounting of the SOC flow in the implementation of REDD+. Keywords: Agriculture, Biodiversity conservation, Climate change, Deforestation and forest degradation, Landscape management ID: 3483094
  • Thumbnail Image
    Book (stand-alone)
    Thematic 1: Farmers’ guidelines on soil and water management in salt-affected areas 2023
    Also available in:
    No results found.

    The threats posed by salt-affected soils to global food security are dire. According to the recent Global salt-affected soils map, over 424 million hectares of topsoil (0–30 cm) and 833 million hectares of subsoil (30–100 cm) are currently salt-affected. This practical guide to soil and water management in salt-affected areas provides vital information to farmers dealing with salinity and sodicity issues on their farms and assists them in following suggested practices to mitigate or/and to adapt to these unfavourable conditions without compromising further losses in yields.

Users also downloaded

Showing related downloaded files

No results found.