桉树第二代萌芽林黄化原因调查及防治对策

摘要

Based on investigations at plantation sites and indoor chemical analyses,we found that the main factors causing etiolation in second generation Eucalyptus plantations regenerated from coppice sprouts included： poor forest soil condition;thin soil layer overlying gravelly sub-soils,low content and effectiveness of substitution Fe and Mn;bad ventilation and photopermeability in untended forest.Based on the casual factors found in this study,corresponding preventive measures were proposed which include： using rational fertilization which is mainly organic-fertilizer with the supply of Fe and Mn;and,using forest tending to increase exposed soil and improve ventilation and photopermeability.%通过林地调查和室内分析化验,结果表明广西楼梯坳林场桉树二代萌芽林黄化的主要原因是：林地土壤条件差,土层薄且砾石多;代换性Fe、Mn含量低,有效性差;林地未抚育,通风透气透光差。针对上述原因提出了相应的防治措施：合理施肥即以有机肥为主,添加Fe、Mn等微量元素;及时抚育增加土壤裸露和林内通风透气透光,可以防治桉树二代萌芽林黄化。