云南省河口垦区优越的生态环境,对橡胶树的生长、发育十分有利,但终因地处纬度偏北,越冬低温则是植胶的不利因素。植胶30年来,常受到寒、风、旱、涝、冰雹等的影响,其中寒则是不利因素中的主导因素,它不仅限制了橡胶树的正常生长和产胶,而且影响了植胶发展的速度,特别是 The excellent ecological environment of the estuarine reclamation area in Yunnan Province is very beneficial to the growth and development of the rubber tree, but the ultimate cause is that the latitude is northward and the overwintering low temperature is the unfavorable factor of planting gums. In the past 30 years, the rubber is often affected by the effects of cold, wind, drought, waterlogging, hail and so on. The cold is the dominant factor in adverse factors. It not only limits the normal growth and gum production of rubber trees, but also affects the development of Speed, especially