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1972年5月调查了德宏垦区1962年至1966年五年间定植的PB86、PR107、RRIM600、GT1等无性系,烂脚普遍率29.4％,指数11.1。十年后(1982年)再次普查时,这部份橡胶林地平均每亩已寒害死亡11.2株,保存率仅60.2％。当前待开垦的植胶地相对高度普遍较高,需要更新的林地又大多是原种植品系抗寒力弱、寒害报废的林地及低产林段。在这些地段用什么种植材料才能有效地免遭寒害,旦其生产较快,产量较高呢?种植优良无性系实生树是一个有效的途径。
In May 1972, the clones of PB86, PR107, RRIM600, GT1 and other clones colonized in Dehong reclamation area from 1962 to 1966 for five years were surveyed. The rate of rotten feet was 29.4% and the index was 11.1. Ten years later (1982) when the census again, this part of the rubber plantation has an average of 11.2 deaths per mu of cold damage, the preservation rate of only 60.2%. At present, the relative high level of plasticized land to be reclaimed is generally high. Most of the woodland in need of renewal is the woodland and the low-yielding forest section in which the original planting strains are weak in cold hardiness and endanger the cold damage. In these areas with what planting material can be effectively protected from cold damage, once its faster production, higher yield? Planting fine clonal tree is an effective way.