關(guān)于V118task1美國黃石公園火災(zāi)范文

　　The flow diagram shows how a forest is regenerated in a national park after being destroyed by fire. The following report describes the process in greater detail.

　　First of all, the forest is hit by lightning and a fire breaks out. The fire spreads quickly because the trees are very close together and there are also old pieces of wood lying on the ground and as a result the forest is completely destroyed by the fire. However, after the forest has been burnt down the ash from the trees fertilizes the soil and creates ideal condition for plant growth.

　　In the next 50 years seedlings from the trees begin to grow and the trees continue to grow until the forest is back to its former state, which takes 300 or more years.

　　In conclusion, forests can regenerate themselves, but it takes a long time and as forests are important for the environment, their protection is also important.

　　118小作文

　　This is a flow chart that describes how the trees in the yellow stone park in the USA will be replanted.

　　After the light and fire had destroyed the trees, most of the trees became soil and dead wood gradually. Then some saplings were planted in the area which was destroyed by the light and fire. In the next 50 years, the young trees will grow slowly.

　　Over the next 100 years, the trees will reproduce, the area of trees will expand extensively. By the next 150 to 300 years, the tree will become taller and thicker.

　　After the next 300 years, most of the trees will fully grow. A new forest will replace the old forest which was destroyed by the light and fire 300 years ago.