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利用Ｍａｎｎｉｎｇ流量公式基本理论，探讨了花岗岩地区５种不同土地利用类型下的糙率系数ｎ值。研究结果表明：松栎混交林下的ｎ值为０．２２８２，其次为马尾松纯林地、灌草坡面、农耕地和裸地，ｎ值分别为０．１８０６，０．１３２８，０．０７２３和０．０５４６。研究还表明：糙率系数ｎ值较大的地表，其渗透性能亦较好。我国南方花岗岩风化壳上形成的土壤影响糙率系数ｎ值的因子较多，而且其关系较为复杂。
Using the basic theory of Manning flow formula, the roughness coefficient n of five different land use types in granite area was discussed. The results showed that the n value under the pine-oak mixed forest was 0.2282, followed by pure P. massoniana forest, shrub-grassland, farmland and bare land, the n values were 0.1806,0.1328,0.0723 And 0.0546. The study also shows that the permeability coefficient of surface with larger roughness coefficient n is better. The factors that affect the value of roughness coefficient n of soils formed on the weathering crust of the southern granite in China are relatively large, and their relationship is rather complicated.