乌桕(Sopium sebiferum Roxb.)自然林分中绝大部分为异龄林,品种良莠不齐,不合理的采收方式,加之不进行专门的抚育施肥管理和病虫危害等因素,是造成乌桕林(树)低产的主要原因。本文通过良种选择、建立采穗圃、截枝更新、高接通换冠等措施,通过分析对比,总结出乌桕低产林(树)改造的关键技术,主要是选择良种和大树改接换冠。该技术在贵州正安、道真、务川、湄潭、遵义县等进行了大面积推广,取得了良好效果。 Most of the natural forest of Sopium sebiferum Roxb. Are heterogeneous forests. The varieties vary greatly. Unreasonable harvesting methods, combined with no special management of fertilization and pests and diseases, The main reason for low yield. In this paper, the key technologies of transformation of lowland and low-yield forest (tree) are summarized through analysis and comparison through the selection of elite seeds, the establishment of spike nursery, the rejuvenation of cut branches, . The technology has been widely promoted in Zheng’an, Daozhen, Wuchuan, Meitan and Zunyi counties in Guizhou Province and has achieved good results.