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1990～1994年与飞机造林困难地区进行人工混播造林试验的同时，又在砚山、保山、永胜等县市的22个播区，从低海拔的干热河谷到高海拔的低温湿润山地，进行了车桑子、山毛豆、银合欢、山合欢、滇合欢、银荆、黑荆、华山松等与云南松或思茅松的飞机混播造林试验示范。参试的10个树种均各有一定的适应能力和良好的成苗效果，试验示范的总成效面积为4．22万hm2，成效率达70％以上，大部分试区的成苗保存密度均在6000株／hm2以上，达到“规程”要求。试验结果表明：1500m以下的干热地带应选用车桑子、山毛豆、山会欢、银合欢作飞机混播造林树种，海拔1600～2400m的干旱、半干旱及湿润山地、可选用车桑子、山毛豆、山合欢、滇合欢、银荆、黑荆分别与云南松、思茅松进行混播造林；海拔2500～3000m左右，宜用华山松与云南松（高海拔种源）混播造林。
In 1990 ~ 1994 and aircraft afforestation difficult areas for artificial mixed planting experiments, but also in Yanshan, Baoshan, Yongsheng and other counties in 22 broadcast areas, from low altitude dry and hot valley to high altitude low temperature humid mountain, The experiments were carried out on the mixed planting of Pinus yunnanensis, Pinus sylvestris, Acacia, Albizzia, Acacia, Silver Jing, Black Jing, Pinus armandii, and Pinus yunnanensis or Pinus sylvestris. The tested 10 tree species each have a certain adaptability and good seedling effect, the total effective area of experimental demonstration was 42,200 hm2, the efficiency of more than 70%, most of the test area seedling storage density In 6000 / hm2 above, meet the “rules” requirements. The test results show that: the dry and hot zone below 1500m should be selected car mulberry, mountain soybean, mountain will Huan, Acacia for aircraft mixed planting tree species, 1600 ~ 2400m above sea level in the arid, semi-arid and humid mountain, , Acacia, Acacia, Silver Jing, black Jing and Yunnan pine, Simao pine mixed sowing; elevation 2500 ~ 3000m or so, appropriate Huashan pine and Pinus yunnanensis (high-altitude provenance) mixed-sown afforestation.