表层土壤是最宝贵的农业生产资源,利用陆地卫星影象能够帮助我们监测土壤发生严重流失的地区变化的情况。由于山地部落人自发的开垦土地和森林不断的遭到破坏,利用陆地卫星影象和土壤流失方程式进行研究,获得了以下结果: (1) 在泰国北部地区,自发的耕作活动加剧了土壤的流失,有20万亩以上的土地每年每公顷损失土壤30—60吨。 Topsoil is the most valuable resource for agricultural production. The use of terrestrial satellite images can help us monitor changes in the area where the soil is heavily depleted. Owing to the continuous destruction of spontaneous reclamation land and forests from mountain tribal people, the following results were obtained using land satellite images and soil loss equations: (1) In northern Thailand, spontaneous tillage activities aggravated soil erosion There are 30-60 tons of soil lost per hectare per year for more than 20 mu of land.