Urban forest refers to the urban forest with trees as the main body in the city and its surrounding areas, which has great ecological functions. Practice has proved that cities
Biological community. It includes urban roads, parks, green trees and urban forests, which is the goal of urban landscape development. However, at present, in urban gardens
Forest parks, scenic spots, fruit forests, shelter forests and water source forests in the suburbs. In the forest green space system, urban forests have not been fully developed, and urban parks
Forest is the main body of terrestrial ecosystem. In terrestrial ecosystems, the ecological benefits of forests are not high. The main reason is that people are interested in urban forests.
It is the most complex composition, the most complete structure, the most ecological function and the importance of energy conversion and material circulation. Judging from the history of garden development,
The ecosystem with the highest biological productivity and the strongest ecological benefits. It is our duty to plant flowers and grass in front of the court and create an environment to beautify our life. No
If there are no forests in the world, the result will be a large number of extinction of biological species, paying attention to ecological benefits. Only today, the environment is deteriorating and sustainable development is affected.
Never, all over the world, O intestines and fresh water flow into the sea in vain, and human beings will be restricted by fresh water, so people begin to pay attention to the ecological function of gardens.
Crisis; Biological carbon sequestration will be reduced by 70%, and the carbon dioxide on the earth will be greatly increased. At present, the ecological function of China's garden system is seriously insufficient, and cities and towns
In addition, the earth is warming; Air pollution has intensified; Natural disasters are frequent, the per capita number of human beings without forests is small, and their quality T is not high. According to 1990 statistics, there are
Live by the law. Therefore, the forest is the ecological balance of nature. "The total dispatch of half of the city's public green area has not reached the right/person. Influenced by design style
Room ". Similarly, urban forests play an extremely important role in maintaining urban ecological balance. There are more lawns and fewer trees in the city.
Its important and irreplaceable role. Its main functions are as follows: it is far from the basic requirements of per capita 1 shade tree. The growth of trees is affected by the following factors
1. Absorb carbon dioxide, release oxygen and maintain carbon-oxygen balance. It is increasingly restricted by the harsh urban environment and socio-economic conditions.
The oxygen content in the gas accounts for 2 1%, and the carbon dioxide content accounts for 0.03%. Left-month anomalies, such as mangoes and almonds in Nanning, rarely blossom and bear fruit.
That's right. If it goes beyond a certain range, human beings cannot survive. Research shows that a fruit.
Every pollution-free area has L. Studies show that the more complex the plant community structure, the larger the unit space.
The air can be kept fresh. The higher the green content of inner leaves, the stronger the ecological function. Dense forests around the city
2. Purify the air and reduce noise. Compared with sparse forests or grasslands with simple structures in cities, urban air is generally affected by its ecological functions.
Toxic gases, dust and bacteria are polluted to varying degrees, but forests can absorb them far away. For example, 1 Many trees absorb carbon dioxide and release oxygen every day.
Toxic gas, dust retention, sterilization and noise reduction. For example, the effect of full willow air per hectare is equivalent to a lawn with 25 tolerance. The feeling of Zhangjiajie forest park
Chinese fir can absorb 720 carbon dioxide every year; Parks can filter out 54%- 100% more comfortable time in the atmosphere than outside, and forests release oxygen every year.
80% pollutants; Chinese fir, Pinus bungeana, Ailanthus altissima, Cinnamomum camphora, etc. They all have a very good 452 1 ton, and the bacterial content in the air is lower than that in Dayong city 1- 1 times, containing dust.
The bactericidal effect of; 4Qm wide forest belt can reduce noise by 0 ~ decibel. This I is 3.6 times lower than that of Dayong City, and the negative air ions are 2(X) higher than that of Dayong City.
In addition, the forest releases a large number of negative ions that are extremely beneficial to the human body, which is twice as beneficial to people. After human exercise, the recovery rate of pulse increased by 30%, and the hearing distance increased.
Class has a good health care function. Humans can treat 88% congestion through forest bath.
Stress and other diseases. In order to realize the sustainable development strategy, both cities and suburbs should
3. Adjust the microclimate. Forests can adjust temperature, humidity and wind power to develop urban forests. How to build and protect urban forests?
Speed to adjust the microclimate, forming the effect of warm in winter and cool in summer. 1. Protection first, development and utilization second. Because the virgin forest is
4. Wind and sand fixation, soil and water conservation, fire prevention and disaster avoidance. For example, it is the result of years of efforts in northern Hebei, and it is playing an important role, such as not taking good care of it.
The vast area of the Ministry and the urban forests of Beijing and Tianjin will make the protection that puzzles Beijing, and will make years of efforts go to waste, causing irreparable losses.
The number of days of sandstorm and sand curtain decreased by 33%. Forests are also fire-proof, earthquake-proof and loss-proof.
Disaster, prevention of radioactive material pollution, etc. 2. Reasonable planning and unified layout. According to the principle of ecological benefit
5. Save water. 50,000 mu of forest can conserve 6,543,800 cubic meters of urban forest and bring it into the overall planning of the city to form a system. such as
Water. Groundwater in 70% cities in the world is polluted. Therefore, Guangzhou Urban Master Plan divides Guangzhou urban green space into three groups.
Forest water conservation is the best way to take groundwater, and the two sides of the Pearl River are regulated in four parts. According to the work of major groups
Road. Different functions, different styles and different locations determine their different forest landscapes and winds.
6. Protect biodiversity. There are many kinds of urban forests, and their appearance is also very distinctive. The major groups are connected by shelterbelts and road greening, full of green.
Complex structure and abundant food are paradise for animals and plants, and biodiversity and other special green spaces are interspersed among them to form an organic whole, making the city
One of the last protective fortresses. The function of the forest has been greatly enhanced. (l9
3. Formulate relevant laws and regulations and implement the system of paid use. Because this city
Urban forests, especially those around cities, belong to different regions or departments.
Without relevant laws and regulations, it is impossible to distinguish responsibility, right and benefit, and only by bringing them into the legal system.
Management track can ensure supervision and coordinated development. In order to mobilize business
Enthusiasm, enhance stamina, and implement the compensation system for public welfare forests. Yao Chong
Using the new forest law to protect natural forests, control logging and build forests respectively.
The compensation system of forest ecological benefits makes the ecological forest area always green,
Green water flows forever.
4. Policy support, scientific design and intensive management. Currently, cities
There are many problems in the design and management of forests, such as too many lawns and forests.
There are too few forests, and the phenomenon of deforestation, development and reclamation in suburbs is common. Suburban forest classics
The camp is vast and there are too many residual forests. Trees and lawns in urban green space cannot be * * *
Survival, but also can not form a complex of trees, shrubs, vines and grass are thriving.
And its ecological function is restricted. Such as Nanning
There is a single forest species in the suburbs, and timber forests account for 72.6%, of which conifers are the main ones.
Most of them are leaf forests (86. 1%), and only 1 1% are shelterbelts. The forest area is gradually decreasing
It is decreasing year by year, from 199 () to 1996, and the forest area is reduced by 147.6 hectares.
In order to make the design and management more scientific, Nanning has promulgated "Nanning"
Regulations on Landscaping Management, which stipulates: design and construction with certificates; new
The greening rate of the residential area should be greater than 25%, mainly plant landscaping; design scheme
Construction can only be started after the approval of the municipal landscaping department. Clear responsibility,
Rights and interests, prohibit the destruction of green space and trees, and vigorously promote voluntary tree planting.
5. Forestry, landscape and other departments work together. Urban forest management
All departments, especially forestry and landscape departments, should define urban forests.
The primary function of forest is ecological protection, so everything must be fully mobilized.
Party enthusiasm, to create conditions for the development of urban forests. For example, Shanghai forest
1990, the institute cooperated with farms and reform-through-labor system to plant 654.38+million.
Mu of American new variety Populus deltoides fast-growing forest, which not only plays a good ecological prevention.
Conservation can also produce wood. Tianjin takes the principle of "planting big trees to make them green and shaped"
"Climate" as the guiding ideology, formulate the protection system of urban-rural integration,
The green protective net with a width of 500 meters and a length of 7 1 km outside the outer ring road has begun.
Step formation, and will establish a complete forest system in the city, and achieved good results.
Ecological benefits. Changchun is building a forest city, making the city in the forest, in the forest.
Surround the city with the sea, blend the city and forest, optimize the urban ecological environment and so on. All these/all these
It is a successful example worth learning.
To sum up, because urban forests can directly affect cities and people.
The ecological quality of children's living environment has attracted the attention of all countries. our country
Forestry and landscape workers have also reached the * * * knowledge and taken active actions.
Let's go For example, Guangxi listed urban environmental greening construction as one of the seven forestry students.
National projects must be grasped, and Chongqing has also vigorously developed mountain city forestry, and both have achieved good results.
The effect is good. As long as Qi Xin and Qi Xin work together, we can build urban forestry.
Good, thus creating conditions for the sustainable development of the city.