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三峡库区紫色土分布地区土壤有机质含量较低。在该区种植新银合欢、马桑、黄荆等植物篱 5年后 ,土壤有机质的含量明显增加 ;腐殖酸品质有不同程度的提高 ,HA FA值增大 ;土壤的团粒结构也有一定的改善。
Soil organic matter content in the purple soil of the Three Gorges Reservoir area is relatively low. The content of soil organic matter obviously increased after planting new hedgerows such as Acacia, Marsh, Vitex negundo in the area for five years. The humic acid quality increased to some extent and the HA FA value increased. The aggregate structure of the soil was also certain improve.