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为了准备一份详细的水侵蚀预测图,对水侵蚀起作用的主要因素进行了调查.为了进行土壤侵蚀的研究,研制了一种喷管状降雨模拟器,由于它的使用,找到了确定土壤侵蚀的最合适的土壤性质,命名为粘土率、分解率和渗透率.斜坡的临界角度估算为10～15°的范围.在种植树、柠檬和草的地方,连续七年使用斜坡测渗计测量土壤损失.在这七年当中裸露地区的土壤损失最大(353公斤/英亩),草地的土壤损失最小,这表明了草对土壤保护的重要性.从这些调查当中,建立了一种预测水侵蚀的方法.为一块新开垦的耕地(大约100公顷),准备了一份详细的土壤地图(比例尺1:10000).这是一块包括果园、庄稼地和厨房花园等在内的典型山坡地,位于日本国的四岛地区.使用详细的土壤地图,准备了一份水侵蚀预测地图和一些解释地图,大约有60%的可耕地处于水侵蚀的危害之中.资料地图例如详细的土壤地图和侵蚀预测地图对于设计水侵蚀控制措施、土壤修整和维持土壤肥力来说是非常有利的.
In order to prepare a detailed water erosion prediction map, the main factors contributing to water erosion were investigated.In order to study soil erosion, a nozzle-shaped rainfall simulator was developed and used to determine soil erosion The most appropriate soil properties are named as clay rate, decomposition rate and permeability.The critical angle of the slope is estimated to be in the range of 10 to 15. In places where trees, lemons and grasses are planted, a slope seepage meter is used for seven consecutive years Soil loss. The largest soil loss (353 kg / acre) in the bare areas over the seven years, with the least soil loss in the grasslands, indicates the importance of grass for soil conservation. From these surveys, a prediction of water erosion A detailed map of the soil (scale 1: 10000) is prepared for a newly reclaimed farmland (about 100 hectares), a typical hillside that includes an orchard, a crop and a kitchen garden, located in Japan Using the detailed soil map, a map of water erosion prediction and some explanatory maps are prepared, and about 60% of the arable land is endangered by water erosion. Fine soil erosion prediction maps and map for the design of water erosion control measures, maintenance of soil fertility and soil dressing is very favorable.