The Evaluation And Optimization Of Ecological Service Function -Take Zhuzhou Yunlong Demonstration Zone As Example

Ecological service plays an important and irreplaceable role in the production of human life, and the green land ecological system as a carrier of providing human ecological services becomes an important research subject of protecting the environ-ment and sustainable development in the world.At present, too fast urbanization has resulted in tensions of shortage of land for production and living in our country, reckless use of ecological resources appears frequently, and unsustainable devel-opment situation is increasingly serious, therefore how to optimize the allocation of ecological resources in the limited land turns to be particularly urgent.Based on the "Torest Eeosystem Serviees Assessment Standards", and the latest modified data of forest ecosystem service as well as the main characteristics of forest type in hunan province, we evaluated quantitatively five kinds of main types of forest ecosystem services in seven factors, and comprehensively calculated the value of ecological service according to related indexes of three ways of land use of the pre-sent situation of green space, control rules of green space and ideal green space. Followings are the main results.(1) In Yunlong demonstration zone, the total value a year of six ecosystem services is 1.0404482 billion yuan, the value of unit area of ecosystem services is 129.20 million yuan/ hm-2·a-1.The order of six forest ecosystem service values is:wa-ter conservation>nutritient accumulation> soil conservation> carbon fixed and oxy-gen conservation> biodiversity conservation> atmosphere environment purifica-tion;The order of total ecosystem service values of different forests is:ar-bor>economic forest>shrubbery> nursery garden> bamboo forest; The order of eco-system service values of unit area of different forests is:arbor> shrubbery> economic forest> nursery garden> bamboo forest.(2)In Yunlong in 2013, the total ecological deficit is 24023.9 hm2, the per cap-ita deficit is 0.4623 hm2/person, which is more than global ecological per capita def-icit of about 1.0 hm2, and we judge that the ecological security level in yunlong be- longs to a safe level at present.(3) According to the basic idea and design of land use in Zhuzhou Yunlong demonstration area as well as the carbon and oxygen balance principle, we calculated out the controlled green land area to be 5957 hm", the ideal green land area to be 6125 hm2.In gauge control scenario, the five indexes values of ecological services are all increased when he ratio of green space system in the arbor, shrubbery, bamboo forest, economic forest and nursery garden is 564:22:1:4:3; In ideal green scenario,the in-dexes values of ecological services could reach the best state when the ratio are 605:2:1:2:2, which is an optimization disign for yunlong to use land.