Question

Discuss the physical characteristics of the ecosystem that influence the productivity of savannah rangelands

Answer 1

The rate of biomass production per unit area is called productivity. The proportion which remains after respiration losses in the plant is termed as net primary productivity (NPP). NPP of savanna rangelands normally lie between 200-2000 g/m​​​​​​2​​​​​m2/year. The physical characteristics which influence this productivity are:

• Climate- it the most important physical attribute affecting the productivity. Savannahs are always found in warm and hot climates.
• Temperature - usually ranges between 24-29°C
• Precipitation- In Savannahs annual rainfall averages 30-50cm.
• Distribution- Distribution influences the productivity of Savannah rangelands, ranging from equatorial and subequatorial regions.
• Soil- Soil is porous, having a thin layer of nutrient rich matter called humus.
• Selective forces- Three major selective forces- that influences the productivity in Savannahs are
  • Recurring fire
  • Periodic drought
  • Grazing

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