由于径流的冲刷,山坡面产生一道道细沟,天长日久,便扩展为深而宽的沟壑。沟壑得不到治理,其上部会继续向上伸延,中、下部则不断加深加宽,侵蚀耕地、梯田、树林、草场、果园。农户分得的自留山或承包的荒山大多有沟壑,只有认真治理,才能把它变成“聚宝盆”。 Due to the erosion of runoff, a hillside produces a roundabout, which stretches into deep and wide gully. Gully will not be governed, its upper part will continue to extend upward, the middle and lower parts will continue to deepen broadening, erosion of arable land, terraced fields, woods, pastures, orchards. Most of the self-retaining hills or contracted barren hills where peasants share are mostly gully. Only by conscientiously treating it can it be turned into a “cornucopia.”