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９９３年于红河州偏北部海拔１０００～１５００ｍ造林困难的贫瘠干热地带进行混交造林试验。试验分马尾松与白头银合欢、圣诞树及山毛豆的株间、行间和带状混交９种处理。经５年的观察分析，结果表明：混交造林各处理的林木保存率达８５％以上；林分长势好；土壤肥力显著提高，每ｈｍ２林地的有效氮含量提高到６７５～２２９５ｋｇ；林分生物多样性能逐渐增强；森林植被相对稳定；生态效益显著。其中以马尾松与白头银合欢混交造林效果较好，可实行株间、行间、带状混交造林。
In the year of 1983, the mixed afforestation experiment was conducted in the barren dry-hot zone with afforestation difficulty of 1000 ~ 1500m in the north of Honghe Prefecture. Test points Pinus massoniana and white head Acacia, Christmas tree and mountain soybean, inter-row and inter-line mixed 9 kinds of treatment. After 5 years of observation and analysis, the results showed that: the preservation rate of mixed tree afforested forests reached more than 85%; good stands; soil fertility increased significantly, available nitrogen per hm2 woodland increased to 67 5 ~ 229 5kg; Forests biodiversity can be gradually increased; forest vegetation is relatively stable; significant ecological benefits. Among them, Pinus massoniana and Althaea albiflorum were better mixed afforestation, which could be used for interplanting, intercropping and ribbon afforestation.