相关素材amazonrainforest亚马逊丛林.pptVIP

By LauraLydia The climate in the Amazonian rainforest is warm and humid and the average temperature in the area is about 79 degree Fahrenheit. One of the prominent features of this area is the difference between the temperature during the day and during the night is greater than that of the difference between the seasons. The Amazon rainforest consists four layers and each layer has its unique ecosystem and plants and animals are adapted to that. The tallest layer is called the emergent layer, which has trees of approximately 200 feet in height. The other layer is canopy which has smooth oval leaves and have pointed drip tip. This makes the flow of water easy and preventing the growth of mosses and fungi. The layer below the canopy layer is able to get only 5 per cent of sunlight and plants of this layer are uniquely adapted to survive in the shadowy layer. The lowest layer is the forest floor and is almost without any plant. Only 2 per cent of sunlight reaches here.  Energy Flow: The energy flow in the Amazon rainforest with sunlight and water is very different from any other biome. Because the tropical rainforest receives so much sunlight and rainfall, plants grow to be bigger, taller, and stronger than plants in any other biome. Plants becoming very large prevent most sunlight from reaching the bottom layer of the rainforest. As shown in the diagram below, 100% of the rainfall reaches the rainforest. 50% of that rainfall is consumed, 25% of it evaporates, and the other 25% of it is surface runoff. This rainfall cycle known as the water cycle continues everyday and produced rainfall and water to the plants and animals of the tropical rainforest biome. Precipitation A average tropical rainforest recieves more than 150cm of rain a year. This is almost 1/8 of an inch per day. Although the rainforest recieves large amounts of rain, not all of it makes it to the forest floor. In fact, less than 30% of the rain fall reaches the forest ground. The tropical rain