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采用根段统计,Χ2测验法分析发现,20cm以下较深土层中根的受害程度明显轻于较浅土层中的。地上部分寒害级别相同的同一品系,不同砧木的根受寒害程度差异显著。1～3级寒害树中,直径大于等于0.25cm的根段的死亡率差异不显著。3级寒害树细根根段死亡率极显著高于2级寒害树的。本次调查结果对橡胶树寒害后处理、高产抗寒品种推广应用及其抗寒力保持等方面具有参考价值。
Root zone statistics, X2 test method analysis found that more than 20cm deeper root damage degree was significantly lighter than the more shallow soil. On the same strain with the same level of cold injury on the ground, the difference of root damage degree of different rootstocks was significant. There was no significant difference in the mortality rate of root segments with diameter greater than or equal to 0.25cm in Grade 1 ~ 3 trees. The mortality of fine roots of grade 3 was significantly higher than that of grade 2. The results of this survey have a reference value on the postharvest treatment of the rubber tree chilling injury, popularization and application of high yield and cold resistance and the maintenance of cold resistance.