在太平洋西北岸的帕洛斯地区,冬小麦生长期间时常发生严重的土壤冲刷。据估计,自1939年以来帕洛斯地区每公顷土地损失近806吨土壤,相当于每公顷平均每年损失土壤32吨以上(Anonymous,1978)。对这些严重冲刷的土壤来说,冻结土壤上的冬季降雨是主要原因(McCool等,1976)。在帕洛斯,冬季月份和春小麦播种时不耕或不松动表土可以减少土壤冲刷。 In the Palos region of the Pacific Northwest, severe soil erosion often occurs during winter wheat growth. It is estimated that nearly 806 tons of soils per hectare have been lost in Palos since 1939, equivalent to an average loss of more than 32 tons of soil per hectare (Anonymous, 1978). Winter rainfall on frozen soils is the main reason for these severely washed soils (McCool et al., 1976). Soil plowing can be reduced by not plowing or loosening topsoil during planting in Palos, the winter months, and spring wheat.