由于其特殊的物理化学性质 ,火山灰土一般被认为 :肥力好 ,有较好的团粒结构 ,抗侵蚀能力强。但是 ,最近对马提尼克岛的香蕉园和厄瓜多尔陡坡耕地的耕作火山土研究数据表明这种观点并非完全正确。实验结果表明 ,自然林地、草地和农作物根系覆盖地区产流量和产沙量都很小。但是 Because of its special physicochemical properties, volcanic ash is generally considered to be: good fertility, good aggregate structure, and strong resistance to erosion. However, recent data from tillage volcanic soil research on banana plantations in Martinique and on steep slopes in Ecuador suggest that this view is not entirely correct. The experimental results show that the runoff and sediment yield of natural forestland, grassland and crops are very small. but