第1个回答 2022-11-10
1) Where are they? A: In Central Africa (Congo Basin)
South Asia and South America (Amazon basin) 2) Why are they there? A: These areas are in the tropical zones and thus they are warm (sufficient sunlight) and humid (much rain)
these are good for plants since they can keep their leaves evergreen* and easy to grow *Plants shed their leaves in Winter because there is evapotrpiration on lef surface which takes water away from the plant
as there are not much water in Winter (less rain)
plants shed their leaves to reduce the leaf area
thus reduce the amount of water been taken away. (and since TPF-- tropical rainforest is always humid
plants there have no need to shed their leaves) 3) What are Tropical Rainforests? A: Tropical Rainforests are a place which is hot and humid. There are many species of plants and animals and some we still have not yet found. TRF is divided into 5 layers (from top to bottom): emergent layer
canopy layer
understorey
shrub layer and ground layer. (they have different characteristics which is too plicated to be explained here) The general characteristics of TRF is there are a lot of climbers
epiphytes and parasites (which live on other plants)
some of the plants (mostly in bottom part) have broad leaves to absorb more sunlight (since the sunlight is blocked by top layers) and frip-tip leaves to shed rainwater away quickly. For the tall trees
they have buttress roots to support them. However
since there are a lot of valuable woods in TRF
many logging panies go there and cut numerous trees. Besides cutting useful trees
they burn those soft wood which is not quite valuable to move away the useful ones (burning is cheapest). Also
there are many other factors which cause the reduction of TRF like building dams
mining
e These offends the natives and environmentalists
but the priviledged groups of people like merchants and logging panies have no plan to stop. *sigh* Amazon Rainforest The Amazon Rainforest is a moist broadleaf forest in the Amazon Basin of South America. It enpasses 7 million km² (1.2 billion acres)
with parts located within nine nations: Brazil (with 60% of the rainforest)
Colombia
Peru
Venezuela
Ecuador
Bolivia
Guyana
Suriname and French Guiana. This forest represents over half of the pla's remaining rainforests. States or departments in four nations bear the name Amazonas for the Amazon. Amazonian rainforests prise the largest and most species rich tract of tropical rainforest that exists. Biodiversity Wet tropical forests are the most species-rich biome
and tropical forests in the Americas are consistently more species rich than the wet forests in Africa and Asia[1]. As the largest tract of tropical rainforest in the Americas
the Amazonian rainforests have unparalleled biodiversity. The region is home to about 2.5 million insect species
tens of thousands of plants
and some 2000 birds and mammals. To date
at least 40
000 plant species
3
000 fish
1
294 birds
427 mammals
427 amphibi
and 378 reptiles have been scientifically classified in the region [2]. Scientists have described beeen 96
660 and 128
843 invertebrate species in Brazil alone [3]. ==================== ============== 由于字数收到规限所以未能尽录。Please refer to en. *** . /wiki/Amazon_rain forest for the plete article. 你仲可以参考下以下既网址﹕ eduweb.co m/amazon rain-tree / amazon-ra inforest/ rainforests.m ongabay/amazon/ rainforest-allia nce ran
参考: .knowledge.yahoo/question/?qid=7006121304704
用point form 可能会好些...
- THEY LOCATE AROUND 5-10 N/S - THE MEAN TEMPERATURE IS 25 DEGREE CELCIUS OR ABOVE - THE ANNUAL PRECIPITATION IS OVER 2
000 mm - THEY HAVE 5 LAYERS OF TROPHIC LEVEL
AND A LONG FOOD CHAIN - THEY WILL FORM A MICRO-CLIMATE(微气候) IN THE TRF.
参考: I STUDY GEOG. =]