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Grassland

Grassland. 草地. What is a Grassland?. A open, continuous and fairly flat areas of grass and other herbs cover 40 percent of the earth's surface. Deep-rooted grasses and oats are commonly seen in grasslands very few trees and shrubs in a grassland. Types of grasslands.

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Grassland

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  1. Grassland 草地

  2. What is a Grassland? • A open, continuous and fairly flat areas of grass and other herbs • cover 40 percent of the earth's surface

  3. Deep-rooted grasses and oats are commonly seen in grasslands very few trees and shrubs in a grassland

  4. Types of grasslands 1. Tropical grassland • A continuous cover of perennial grasses are found

  5. Types of grasslands 2. Temperate grasslands • Prairie is an example of Temperate Grassland

  6. Grasslands in Hong Kong • On hillside • grass and shrubs under 0.3 meters in height • Small amount • Mainly found in the New Territories • Varied ( mixture of herbs and small shrubs)

  7. Reasons for the lack of grassland 1. Soil Grasslands in..... • Higher slopes are subjected to wind exposure, poor soil condition and rapid runoff. • Lower slopes with poor soil conditions are mainly formed after abandon of farmland

  8. Soil erosion

  9. Reasons for the lack of grassland 2. Climate& Temperature • Moderate climate • High annual rainfall would forms a forest or woodland.

  10. Reasons for the lack of grassland 3. Latitude • Not enough land • Not near the equator • At subtropical latitudes • Not lying on the region of grasslands

  11. Ways to form grasslands • Fire is the factor to balance from forest to grasslands. • Fires set by lightning and by humans • Perennial grasses and herbs are not harmed by fires that destroy most shrubs and trees.

  12. Use of Grassland 大氣過濾器 • Grass absorb the toxic gases in the atmosphere. • The secretion of grass can kill the bacteria ,reduce the concentration of bacteria in the atmosphere. • Absorb and adsorb the dust.

  13. Use of Grassland 城市之肺,房屋之窗 • Grass carry out photosynthesis • Absorb CO2, release O2 • 1.5g per meter square in 1hour

  14. Use of Grassland • Grasslands are highly productive when converted into agricultural uses • Since the soil is full of nutrients. The organic material (i.e. decomposers) makes the soil so productive

  15. Conclusion • Grassland in HK is a poor habitat for vertebrates and most invertebrates • Since it provide neither food nor protection • So, we need to conserve certain species of grass or herbs

  16. The End

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