作为“绿色宝藏”的森林，其环保价值早已被世人所公认：涵养水源，保持水土，促进天上水、地表水和地下水的正常循环，防风固沙，固定二氧化碳及提供氧气等。然而，时至今日森林已变得日益溃乏。其中，好不容易幸存下来的自然多在发展中国家地区。可是，这些国家为了实现经济 As a “green treasure”, the value of its environment has long been acknowledged by the world as: conservation of water resources, conservation of soil and water, promotion of normal circulation of heavenly and surface water and groundwater, wind and sand fixation, fixation of carbon dioxide and provision of oxygen. However, forests have become increasingly depleted to this day. Among them, finally survived the natural mostly in developing countries. However, these countries in order to achieve economic