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紫色土是四川盆地最主要的土壤类型,约占盆地山丘总面积的70％。杉木(Cunninghamialanceolata、柏木(Cupressus funebris)、湿地松(Pinus elliottii)、大叶桉(Eucalyptus robusta)、香椿(Toona sinensis)、刺槐(Robinia pseudoacacia)、喜树(Camptotheca acuminata)和桤木(Alnus cremastogyne),是盆地内的常见造林树种,具有生长迅速、适应性较强和用途广泛等特点。由于紫色土性质及肥力条件的差异,不同树种又有生态要求的区别,为了使植物和
Purple soil is the most important soil type in Sichuan Basin, accounting for about 70% of the total area of the basin hills. Cunninghamia lanceolata, Cupressus funebris, Pinus elliottii, Eucalyptus robusta, Toona sinensis, Robinia pseudoacacia, Camptotheca acuminata and Alnus cremastogyne, , Is a common species of afforestation in the basin, with the characteristics of rapid growth, strong adaptability and wide range of uses etc. Due to the differences of purple soil properties and fertility conditions, different species have ecological requirements difference, in order to make plants and