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日本属亚洲季风气候,气候温暖,雨量丰沛,由于灌溉方便,从古代起,沿河两岸平地已迅速发展为稻田.因此,高产量的稻谷便成了日本人的主要食物,另一方面,缺乏灌溉的山地和贫瘠的农地必定地导致了低产.这些贫瘠的山地农田,尤其是含有火山灰风化花岗岩的特殊土壤农地,不仅易受侵蚀,而且容易引起诸如崩坍、滑坡、泥沙输移等灾害.给这种土地造成了肥土流失以及农地的破坏.
Japan is an Asian monsoon climate with a warm climate and abundant rainfall. Since ancient times, the flatlands along the banks of the rivers have rapidly developed into paddy fields because of their convenient irrigation. Therefore, high-yielding rice has become the staple foods of Japanese people and, on the other hand, lack of irrigation Of the mountainous and barren farmlands inevitably lead to low yields.These infertile mountain farmland, especially the special soil farmland containing volcanic ash weathered granite, is not only vulnerable to erosion, but also prone to disasters such as collapse, landslide and sediment transport The loss of soil and soil and the destruction of agricultural land have been caused to such land.