Presentation on theme: " Constant warmth and rainfall provides the home to most of the species on Earth. > 70% of all terrestrial species Question: How does the structure."— Presentation transcript:
Constant warmth and rainfall provides the home to most of the species on Earth. > 70% of all terrestrial species Question: How does the structure of a rainforest allow so many species to coexist?
Top soil is thin and poor due to rapid nutrient recycling. Adaptations to soil conditions Tree trunks widen their bases for support Shallow roots to absorb nutrients.
Vines and Epiphytes grow on the sides of tree trunks and limbs. Why would this be an advantage?
Plant life is adapted to fluctuating temperatures.
Growing Season Spring through Summer Plants and trees produce and store large amounts of food Autumn Trees shed leaves to preserve water and energy over the winter Photosynthesis stops Winter Trees consume food storages.
Decay of leaf litter is slowed by the winter months. This provides a deep, rich layer of soil. More sunlight penetration results in a thicker understory and more plant life on the forest floor.
Limited water Heavy cycles of rain followed by long droughts. Trees and shrubs grow near ponds, streams, and springs.
Fires Destroy most trees and shrubs The majority of the biomass for grass is belowground in the form of roots. Why is this an advantage for grasses? Convert organic matter into valuable nutrients, providing a deep, fertile soil for grasses. Heat assists in germination of grass seeds.
Wind Carries seeds and pollen long distances Dispersal mechanism.