飞机造林混播树种选择试验

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。

Tests on Species Selection of Aerial Mixture Sowing Afforestation

From 1992 to 1994, aerial mixture sowing afforestation was done on 22 sowing plots of different site types from dry and hot valley with low elevation in Yanshan,Baoshan and Yongsheng et al., the afforestation species adopted are Dodonaea viscosa,Tephrosia candide, Leucaena glauca, Albizia kalkora. Albizia mollis, Acacia dealbata, Acacia mearnsii, Pinus armandi mixed with Pinus yunnanensis or Pinus kesiya var. langbianensis, all of the 10 species have different adaptation and good planting effect, the afforestation area which gain effects is 42200 hm2 and occupied over 70% of the total afforestation area,the density of seedlings preserved of most test area is over 6000 trees/ hm2 and attain the demands of "Rules" relevant, the results of tests indicated that Dodonaea viscosa, Tephrosia candida, Albizia kalkora and Leucaena glauca were the species suiltable for aerial mixtrue sowing afforestation at dry and hot region with elevation the lower than 1500m, mixed Dodonaea viscosa, Tephrosia candida, Albizia kalkora, Albizia mollis, Acacia dealbata, Acacia mearnsii with Pinus yunnanensis or Pinus kesiya var. langbianensis respectively as aerial mixtrue sowing afforestation species was feasible at dry, semiarid and humid mountain area with the elevation of 1600m~ 2400m, mixed Pinus armandi with Pinus yunnanensis was feasible at region with the elevation of 2500m~ 3000m.