森林有什么好处 英语作文

Both forest resources and the environment with its dual biological properties, and has a huge production capacity and become a very important land To ecosystems. Forests not only provide a variety of products that can be materialized, but also to create a beautiful ring Environment, play a strong eco-efficiency, maintain the ecological balance of the earth, constitute the basic human survival and development of Support. Look at all times, all social progress and development of forest growth and decline, the rise and fall closely related to forestry, forest Forests and forestry is an important symbol of social civilization. However, population growth and economic development pressure, so many parts of the forest Lin reduction and recession. If this trend continues, the future more and more specific than today's population today relies less than the Forests, which biodiversity, global climate and life support systems will have a significant impact, severely limiting people Class development. Therefore, the production function and must be in the forest to find a balance between the protection function. Forest ecosystems to human Contribution to the class, often used in ecological research, "ecological, social and economic benefits" to describe. However, Because of its complexity and uncertainty of how the valuation of these benefits, has been plagued ecologists and economists Important issues. Can you give forest ecosystems for scientific contribution to mankind's valuation, will have a direct impact on policy at all levels Government decision-making process. Let ecosystem services from the perspective of the contribution of forests to human beings. Ecosystem functioning and ecosystem services Earth's ecosystem is human survival and development of material base, ecosystem services and the health of these services generated State system itself on the Earth's life support system functions is essential to play. They directly or indirectly, to improve the human Class benefits, and therefore reflects the total economic value of the part of the world. Because ecosystem services can not be fully in the market The reflected, or fully productive capital with economic services and compared it in the formulation of policies, they often do not Have seriously enough, will eventually endanger the sustainable development of mankind. Based on this understanding, some scholars under the public On the original published studies and some calculations to estimate the 17 communities in 16 categories of ecosystem services, the economic value of existing Value, and thus calculate the value of the entire biosphere ecosystem. For the entire biosphere, the value of its annual Between 16-54 trillion dollars, the average annual value of 33 trillion dollars. Because there are some uncertainties, this estimate Is a minimum estimate. In contrast, global GDP each year is approximately 18 trillion. Life left Support system of services, all economic activities on the planet will cease to exist. In this sense, the planet's ecosystems The total value of the service role of the economy is infinite. CONST ANZA and other forest ecosystem services (climate regulation, disturbance regulation, water supply, water regulation, erosion control System, to soil development, nutrient cycling, waste treatment; biological control, food production, raw materials, genetic resources, entertainment Music, culture 14) pricing that provides services to the global forest each year the total value of about 4.7 trillion U.S. dollars; per hectare About $ 969 (which provides raw materials and food production were $ 138 and $ 43, both of 18.68