桉树生态经营技术研究

以桉树（Eucalyptus spp.）混交林和纯林为研究对象,集成树种选择和林分结构调控等定向培育技术,构建桉树速生丰产栽培技术体系。结果表明,混交可促进桉树生长,提高林分生物量,改善土壤理化性质,桉树×红锥（Castanopsis hystrix）混交林的营林效果最好。在不同间伐强度桉树纯林林下套种米老排（Mytilaria laosensis）、红椎和火力楠（Michelia macclurei）,强度间伐处理下,桉树的生长和套种树种的蓄积量表现较好;改培后的混交林能有效缓解土壤酸化,提高土壤养分含量。在桉树大径材培育中,可采用强度间伐,间伐7年后林分的蓄积量比对照林分高出20.67%。

Taking mixed and pure *Eucalyptus* spp. forests as research subjects, this study integrated targeted cultivation techniques such as tree species selection and stand structure regulation to construct a technical system for fast-growing and high-yield cultivation of *Eucalyptus*. The results demonstrated that mixed planting could promote the growth of *Eucalyptus*, elevate stand biomass, and improve soil physical and chemical properties. Among them, the *Eucalyptus* × *Castanopsis hystrix* mixed forest achieved the best afforestation effect. When interplanting *Mytilaria laosensis*, *Castanopsis hystrix* and *Michelia macclurei* under the understory of pure *Eucalyptus* forests with different thinning intensities, the intensive thinning treatment yielded better performance in both the growth of *Eucalyptus* and the stock volume of interplanted tree species. The transformed and cultivated mixed forests could effectively alleviate soil acidification and increase soil nutrient content. For the cultivation of large-diameter *Eucalyptus* timber, intensive thinning is recommended; the stand stock volume 7 years after thinning was 20.67% higher than that of the control stand.