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How to write three trees in the composition of the senior high school entrance examination
Three trees is an ecological restoration technology. Generally speaking, the purpose of geological environment restoration and natural ecological protection is achieved by planting different kinds of trees.

I. Origin and History of Three Trees

The concepts of "1" and "three trees" can be traced back to the 1970s, when the United States was studying ecological problems such as grassland degradation and soil erosion.

2. Found a wonderful phenomenon of ecological restoration-planting about three different trees on a grassland at the same time can achieve obvious restoration effect. Later, this technology was introduced to China and became an ecological restoration experience and technology in China.

Classification and function of two or three trees

1. Trunk tree: With deep root system and strong drought tolerance, it is a good tree species choice to prevent land loss and farmland water conservancy construction.

2. Street trees: They have good functions of preventing wind, preserving water and beautifying the environment, and are the main force of urban environmental greening.

3. Fruit tree: It has many functions such as farmers' self-sufficiency and increasing economic income, and is an important way to prevent poverty and improve farmers' living standards.

Practical function and application of three trees

1 Three-tree technology has achieved good results in practical application, which can not only restore grassland, but also prevent desertification and prevent land water loss.

2. In China, the "Three Trees" technology has been widely used in large-scale ecological restoration projects such as the national Yangtze River Delta ecological restoration project and the project of returning farmland to forests, which has made great contributions to solving social and environmental problems.

Fourth, the development prospects of the three trees

1. With the continuous development of social economy and the increasingly prominent environmental problems, the ecological restoration technology of Three Trees will be paid more and more attention and applied by people.

2. In China, the "Three Trees" technology has been widely used in the construction of an ecological new city represented by the national "Liangjiang New Area" to create a green ecological environment. At the same time, the "three trees" technology can also be combined with other technologies such as solar energy and plant management to achieve more efficient ecological restoration.

Verb (abbreviation of verb) dispute about three trees

1. Although Sanshu has made some achievements in the field of ecological restoration, in the eyes of some people, Sanshu still has some disputes and shortcomings.

2. For example, three trees can not eliminate deep-seated problems such as land pollution, but only achieve short-term environmental improvement by planting trees; In addition, due to the variety and quantity of planting, the effect is difficult to guarantee.

3, therefore, in the practical application and promotion, it is necessary to further explore and improve the relevant technology and policy system.