类别 全部 - rainfall - temperature

作者:wei da 12 年以前

1506

tropical rainforest

Tropical rainforests are characterized by high levels of precipitation, often exceeding 1000 cm annually, though typically ranging between 175 cm and 200 cm. The mean monthly temperatures consistently remain above 18°C throughout the year.

tropical rainforest

tropical rainforest

Forest structure

Emergent layer
which grow above the general canopy, reaching heights of 45–55 m, although on occasion a few species will grow to 70–80 m tall
The emergent layer contains a small number of very large trees, called emergents
Canopy layer
It contains the majority of the largest trees, typically 30–45 m in height. Tall, broad-leaved evergreen trees are the dominant plants.
The canopy is the primary layer of the forest forming a roof over the two remaining layers.
Understory layer
Only about 5% of sunlight breaches the canopy to arrive at the understory
he understory is home to a number of birds, small mammals, insects, reptiles, and predators
The understory layer lies between the canopy and the forest floor.
Forest floor
only plants adapted to low light can grow in this region
the bottom-most layer, receives only 2% of the sunligh

Climate Characteristics

This high level of precipitation often results in poor soils due to leaching of soluble nutrients.
can exceed 1,000 cm (390 in) although it typically lies between 175 cm (69 in) and 200 cm
Average annual rainfall is no less than 168 cm
Mean monthly temperatures exceed 18 °C (64 °F) during all months of the year

Where Can we find it?

A tropical rainforest is an ecosystem type that occurs roughly within the latitudes 28 degrees north or south of the equator (in the equatorial zone between the Tropic of Cancer and Tropic of Capricorn)

Video about topicla rainforest.

What Country Can We Find It?

Subtopic Asia, Australia, Africa, South America, Central America, Mexico and on many of the Pacific, Caribbean, and Indian Ocean islands