The establishment of hedges and tree strips are important measures to minimize wind erosion and protect agricultural crops. In the Western Cape region, strong winds influence evapotranspiration during the growing season of different crops. The effects of windbreaks on the local wind field were investigated on two farms in the Cape Winelands: on Babylonstoren wine farm, Chinese poplars (Populus simonii) are planted as windbreaks for citrus plantations and vineyards, while evergreen beefwood (Casuarina cunninghamiana) hedges are used on Rust en Vrede to protect citrus plantations from wind damage. The analysis showed clear seasonal differences in wind speed and wind direction. Strong winds are most common in the Western Cape during the summer months, especially from November to February. The main wind direction in the summer months is primarily east-southeast to south-southeast, while the winds in winter come from north-northwest to west-southwest. In the vineyards, the wind reduction is almost 22% and particularly in the summer months with the strong winds from the south 24% to 29%. Within citrus orchards with beefwood windbreaks, local differences in the average wind speed between the measuring stations of 18% were observed during the summer months. The seasonal changes of the microclimate within the citrus plantations were attributed to the different weather conditions.

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Local Wind Field on Farms in the Cape Winelands

  • Thomas Littmann,
  • Tobias Recke,
  • Maik Veste

摘要

The establishment of hedges and tree strips are important measures to minimize wind erosion and protect agricultural crops. In the Western Cape region, strong winds influence evapotranspiration during the growing season of different crops. The effects of windbreaks on the local wind field were investigated on two farms in the Cape Winelands: on Babylonstoren wine farm, Chinese poplars (Populus simonii) are planted as windbreaks for citrus plantations and vineyards, while evergreen beefwood (Casuarina cunninghamiana) hedges are used on Rust en Vrede to protect citrus plantations from wind damage. The analysis showed clear seasonal differences in wind speed and wind direction. Strong winds are most common in the Western Cape during the summer months, especially from November to February. The main wind direction in the summer months is primarily east-southeast to south-southeast, while the winds in winter come from north-northwest to west-southwest. In the vineyards, the wind reduction is almost 22% and particularly in the summer months with the strong winds from the south 24% to 29%. Within citrus orchards with beefwood windbreaks, local differences in the average wind speed between the measuring stations of 18% were observed during the summer months. The seasonal changes of the microclimate within the citrus plantations were attributed to the different weather conditions.