坡地人工植被的生态效益防护林—桔园模式优于无防护林桔园模式。
The ecological effect of the orchard-shelterbelt model is better than that of the orchard model in the gental sloping fields.
三北防护林体系工程是一项宏伟的千秋工程，她不仅是中国生态环境建设的伟大创举，也是全球生态环境建设的重要组成部分。
Noted as a great splendid program, the three north shelterbelt program is not only a pioneering work in China's eco-construction, but also the important part of national eco-construction.
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。
Construction of ecological environment forest, urban protection forest, water and soil conservation, production and comprehensive utility and development of nursery stock.
长江流域生态环境建设中必须注意资源植物的持续利用、防护林的质量和生态平衡等问题。
The sustainable use of resource plants, the quality of shelter forests and the ecological equilibrium are key problems in the environment construction in the Yangtze Basin.
根据黄土地区防护林生态系统水分循环的特征，提出了防护林生态系统水量平衡方程。
According to the features of water cycle in protective forest ecosystem in loess area, the equation of water balance for the protective forestry ecosystem was put forward.
研究表明：上述树种的生物学、生态学特性对于其分布区内水土保持、水源涵养及防护林营建的树种选择有积极的意义和可行性；
The result shows: bioecological characteristics of these tree species can help to choose tree species for planting protective forest in their distributing area.
④种树种草，营造农田防护林，建立新的农业生态系统。
Plant trees and grasses, and protective froest, form new agr-ecosystem.
研究表明：上述树种的生物学、生态学特性对于其分布区内水土保持、水源涵养及防护林营建的树种选择有积极的意义和可行性；
The result shows: bio ecological characteristics of these tree species can help to choose tree species for planting protective forest in their distributing area.
研究表明：上述树种的生物学、生态学特性对于其分布区内水土保持、水源涵养及防护林营建的树种选择有积极的意义和可行性；
The result shows: bio ecological characteristics of these tree species can help to choose tree species for planting protective forest in their distributing area.
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