不同立地的桉－草复合经营模式效益分析

摘要

在不同造林密度和林地立地质量的桉树人工林中间种山毛豆、桂牧1号象草和柱花草，开展不同桉－草复合经营模式的生物产量和经济收益调查分析，结果表明，桉树人工林间种牧草能有效促进桉树生长，各模式单位面积木材蓄积量比纯林提高0．63％～22．58％，总净收益提高9．85％～19．77％。桉树密度、立地质量和牧草品种3因素对年净收益率的影响均表现为显著性差异，筛选出经济效益较为优良的桉树（2 m×6 m）＋山毛豆模式，值得推广应用。%In different planting density and land conditions of Eucalyptus plantations, the different agroforestry pat-terns with forages growing was studied by planting Tephrosia candida, (Pennisetum americanum×Pennisetum purpure-um) ×Pennisetum purpureum schum.cv.Mott and Stylosanthes guianensias SW, and the biological yield and economic returns of these agroforestry managements were investigated and analyzed.The results showed that Eucalyptus planta-tion with interplantion of forages could effectively promote the growth of Eucalyptus, and each model had a increased wood accumulation volume in each unit area with 0.63% ~22.58%compared with that of pure Eucalyptus planta-tions , the total net income increased by 9.85% ~19.77%.Annual net yield of different land conditions and den-sity varied significantly.In general, the pattern of Tephrosia candida growing in Eucalyptus (2 m×6 m) is worth to popularization.