Abstract: The thermal-increasing efect of certain forest land has been investigated and it has some practical meanings for the rubber plantation in tropics of China. This artical is composed of three parts: part Ⅰ, The conditions for increasing the temperature inside the natural forest; part Ⅱ, increasing the temperature features of the intercropping rubber forest; part Ⅲ, the intercropping rubber forest with over crown canopy (by deciduous or sparse tree crown)in cold season is a reasonable community structure for building cold resistant rubber plantation("Biological cold-resistant structure).

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