However, the externality of forest ecological effect makes its value cannot be compensated, which becomes principally limit factor for forest ecological construction.
但由于森林生态效益的外在性，使得其价值补偿无法实现，从而成为我国森林生态建设的根本性制约因素。
Construction of ecological environment forest, urban protection forest, water and soil conservation, production and comprehensive utility and development of nursery stock.
生态环境林、城市防护林建设，天然林资源保护，水土保持，林业苗木生产及综合利用开发等。
The state-owned forestry region is the largest reserve resource of forest and supply base of timber in our country, bearing the important task of ecological construction at the same time.
国有林区是我国最大的森林后备资源培育基地和木材及林副产品供应基地，同时也担负着生态建设的重任。
The forest belt construction has very important meanings in improving the urban ecological environment, promoting the urban grade around the city, and improving the human settlements environment.
环城林带建设对于改善城市生态环境，提升城市品位，改善人居环境具有十分重要意义。
The forest belt construction has very important meanings in improving the urban ecological environment, promoting the urban grade around the city, and improving the human settlements environment.
环城林带建设对于改善城市生态环境，提升城市品位，改善人居环境具有十分重要意义。
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