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一九六五年以前,云南垦区橡胶宜林地以热量和越冬条件为主的各气象因子,结合地貌、土壤、植被等综合自然条件,划分为三种生长条件类型区,这在宜林地资源的开发利用上有着重要的意义。从速生高产和大区越冬表现来看,这种综合环境类型的区划是正确的。 随着生产的发展,对宜胶环境的认识也在逐步深化。一九七三年以前,我区主要按宜林地三大类型区配置品系,如一类型区只追求高产,忽视抗性。不分小环境差异,普遍种植RRIM600和PB86(占70％以上),品系单纯,抗寒基础很差,在一九七三/七四及一九七五/七六年冬两次严寒后胶树招致寒害,损失严重。同时在各类型区内也反映寒
Prior to 1965, all the meteorological factors in Yulin, arable areas in Yunnan Province, which were dominated by heat and overwintering conditions, were divided into three types of growing conditions based on the integrated natural conditions of landform, soil and vegetation, Development and utilization of great significance. From fast-growing high-yielding and the performance of the winter area, the division of the integrated environment type is correct. With the development of production, the understanding of environment should be gradually deepened. Before 1973, our district mainly arranged strains according to the three major types of forest land to be suitable for cultivation. For example, one type of area only pursued high yield and neglected resistance. Regardless of small differences in environment, RRIM600 and PB86 (accounting for more than 70%) were commonly planted. The strains were pure and their base for cold-hardiness was poor. After the winter cold in 1973/74 and in the winter of 1975-76, Trees cause chills, losses are serious. At the same time in all types of areas also reflect the cold