我国植胶区地理位置偏北,相当一部分地区存在寒害问题,在这些地区植胶,首先要求种植材料应具有相适应的抗寒力,又要求有较高的产量水平。但抗寒和高产是两种不同的性状,经过抗寒和产量鉴定,国内外现有品系有些抗寒力强但产量低,有些产量高但抗寒力差,这种现实状况与生产上的要 China’s rubber plantation geographically north, a considerable part of the existence of chill injury problems, planting plastic in these areas, first of all require planting materials should have the appropriate cold resistance, but also requires a higher level of production. However, cold resistance and high yield are two different traits. After cold hardiness and yield appraisal, some existing domestic and foreign existing strains have strong cold hardiness but low yield, while others have high yield but poor cold hardiness. This reality is related to the production want