Geographical knowledge points: to the second section: forest development and protection

Section II: Development and Protection of Forests

1, forest distribution

The existing virgin forests are concentrated in coniferous forests and tropical rainforests in the sub-frigid zone. Primitive forests are preserved because of vast land, sparse population and poor natural conditions, or because they are difficult to pass and developed late, so they have not been destroyed on a large scale.

Amazon rainforest is the largest and best-preserved virgin forest on earth.

2. Distribution of tropical rain forests

Tropical rain forests are mainly distributed on the north and south sides of the equator, but can extend to the north and south latitudes where the mainland meets 15-25 degrees.

Tropical rain forest has three concentrated distribution areas: Southeast Asia, Congo River Basin in Africa and Amazon River Basin in South America.

3. The impact of the rainforest on the global environment.

The lungs of the earth: profoundly affect the balance of carbon and oxygen in the earth's atmosphere.

② Promote the global water cycle and adjust the global water balance ③ The world's biological gene treasure house.

4. Vulnerability of rainforest ecology

Almost all the nutrients needed for the growth of rainforests are stored in plants on the ground.

5. Reasons for the destruction of rainforests: The fundamental reason is that population growth and poverty lead to development needs.

The direct reasons are: excessive migration of agriculture; Commercial logging; Mining, road construction and urban construction; Open up a big farm and pasture.

6. Amazon development plan

(1) Before the 1950s: the lifestyle was backward and underdeveloped, which didn't have much influence.

(2) The population has increased rapidly, and the rainforest has been destroyed unprecedentedly.

(3)1970, the Brazilian government announced the famous development plan of the Amazon basin: building a trans-Amazon highway; Immigrated to the Amazon plain; Encourage multinational enterprises to invest and develop.

7. Protect the rainforest

Under the current background, in the face of the severe situation that the rainforest is being destroyed, protection should be given priority.