"Care for vegetation and green the motherland" PPT courseware 6

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"Care for vegetation and green the motherland" PPT courseware 6

(1) Main types of vegetation in my country

1. The concept of vegetation - a group of plants that cover the earth's surface and live together regularly

2. Type

Rainforest

evergreen broadleaf forest

deciduous broadleaf forest

Coniferous forest

grassland

desert

(1), Tropical rainforest

The weather is hot and rainy throughout the year, and there are rich plant species. The leaves are evergreen all year round, and plants bloom in all seasons. Such as: Xishuangbanna.

(2) Evergreen broad-leaved forest:

The summer is hot and humid, the winter is dry and cold, and the plants with four distinct seasons are evergreen broad-leaved trees. Such as: Yangtze River Basin.

(3) Deciduous broad-leaved forest:

There are four distinct seasons throughout the year, with hot and rainy summers and cold winters. The plants are mainly deciduous broad-leaved trees. Such as: North China.

(4) Coniferous forest:

Summers are warm and winters are cold. Plants are mainly composed of fir and pine conifers, such as the Greater Khingan Mountains and the Altai Mountains of Xinjiang.

2. Main problems faced by vegetation in my country

1. China’s forest resources

The country's forest area is 195 million hectares, the forest coverage rate is 20.36%, and the forest stock volume is 13.721 billion cubic meters.

Problems faced: First, the total amount of forest resources is insufficient. my country's forest coverage rate is only 2/3 of the global average, ranking 139th in the world. Second, the quality of forest resources is not high. The volume of arbor forests per hectare is 85.88 cubic meters, only 78% of the world average. Third, the pressure on forestland protection and management is increasing. 8.3173 million hectares of forest land were converted into non-forest land. Fourth, it is increasingly difficult to establish forests. Only 13% of the land suitable for forestation is of good quality, and 52% is of poor quality; 60% of the country's land suitable for forestation is distributed in Inner Mongolia and the northwest region (results of the seventh national forest resources inventory in November 2009)

2. Long-term irrational use of forest resources and indiscriminate deforestation

In the early 1950s, there were still more than 9 million acres of subtropical forest in Xishuangbanna, my country. By the 1990s, the area had decreased by more than 3 million acres. In the early 1950s, Hainan Island had 18 million acres of natural forest, while statistics in 1984 showed that there were only 3.7 million acres of natural forest on the island.

The continuous destruction of forests has led to serious ecological disasters in our country. Floods occurred three times in Sichuan Province in the 1950s, five times in the 1960s, six times in the 1970s, and 10 times in the 1980s. People may still remember the devastating flood in the Yangtze River Basin in 1998.

3. Grassland degradation and desertification

From an ecological point of view, deserts are not terrible, what is terrible is desertification; deserts are not terrible, what is terrible is desertification. Originally, a desert or a desert is a large ecosystem, just like the forest ecosystem, river ecosystem, and grassland ecosystem. The problem is that if it is destroyed by human interference, it will become desertification. There is also some vegetation in deserts and deserts. There is very little vegetation in deserts, but deserts and deserts are relatively stable and it is impossible to form a large sandstorm. The reason why sandstorms are formed is that human interference turns deserts into deserts and grasslands into desertification. That’s why nature brings harm to people. This actually reflects that the relationship between man and nature is not handled properly. The responsibility lies not with nature but with man.

environmental value of forests

What functions of the forest do the following phenomena reflect?

Calling forests the lungs of the earth

In summer, the monthly average maximum temperature inside Yanzhong Green Space is 0.6°C lower than the maximum temperature outside the green space.

Costa Rica, which only accounts for 0.03% of the world's total area, has 5% of the world's biological species due to the establishment of national parks, biological reserves, virgin forest reserves, wetlands and other forestry resources.

After returning farmland to forest, returning farmland to grassland and planting artificial grass in the Yellow River Basin, the ecological environment in areas with soil erosion has been effectively improved.

The southern Sahara desert is slowly receding and green life is returning south of the Sahara

3. Caring for vegetation and greening the motherland

1. Our country has proposed the goal of increasing the forest coverage rate to 30%. What are the reasons?

2. Caring for vegetation and greening the motherland, what are you going to do?

After the founding of the People's Republic of China, in February 1979, March 12 was adopted as my country's Arbor Day.

The meaning of the Arbor Day emblem:

1. The shape of a tree means that all people are obliged to plant 3-5 trees, and everyone takes action to green the land of the motherland.

2. "Chinese Arbor Day" and "March 12" show the perseverance and determination to transform nature and benefit mankind by planting trees every year.

3. The five trees can be understood as "forest", extending from it to connect the outer circle, showing the greening of the motherland and realizing a virtuous cycle of the natural ecological system with forests as the main body. The Arbor Day emblem is a symbol that summarizes the meaning.

As global warming intensifies, Antarctica may lose trees again in the next hundred years

Professor Robert Dunbar from Stanford University in the United States said at this conference that in the next 100 years, the level of carbon dioxide in the atmosphere will double, and Antarctica, the ice-covered continent, will also change as a result. It may Restored to the way it was 40 million years ago.

Professor Dunbar told the 850 delegates participating in the meeting: "At that time, the climate was warm and the shrubs and trees were lush and lush." ​​Dunbar said that meteorological experts had predicted that by 2100, the level of carbon dioxide in the atmosphere would double. "Unfortunately, it actually looks like it might happen a little sooner now."

Scientists at the meeting also stressed that greenhouse gases such as carbon dioxide contribute to rising temperatures across the globe. Greenhouse gases are mainly produced by burning fossil fuels, such as coal and oil.

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Update Time: 2024-11-23

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