Changes in soil movement after forest clearing in the main island of Okinawa, southwestern Japan

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  • 沖縄本島における皆伐後の土砂移動量変化

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In the main island of Okinawa, inflow of "reddish soil" caused by development projects has damaged the ecosystems of coral reefs. The conversion of hillslopes into farmlands and housing areas and the construction of roads in woodlands have been reported to be the causes of soil erosion. However, the effect of felling on soil erosion has not been elucidated. To determine changes in soil erosion rates after forest clearing, the amounts of soil movement in a cutover basin on the main island of Okinawa were measured. The results of measurements showed that 1)the amount of soil movement in the cutover basin was greatly decreased when most of the surface of the slope was covered by understory vegetation; 2)the amount of soil movement differed according to soil type, with the largest soil movement occurring in the case of surface gleyed red and yellow soils, the second-largest soil movement occurring in the case of yellow soils, and the least soil movement occurring in the case of red soils.

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