红壤坡地不同土地利用方式土壤侵蚀的时空分布规律研究

Temporal and spatial distribution of soil erosion on red soil slope field under different land use patterns.

应用定位土芯Eu(Europium)示踪新方法 ,研究红壤坡地不同土地利用方式下土壤侵蚀的时空分布规律 .结果表明 ,新方法对以片蚀和细沟侵蚀为主的红壤坡地是适用的 ;土壤侵蚀的时间分布与降雨量的年时间分布相一致 ,过程性暴雨期表现为全年土壤侵蚀的高峰期 ;在复合坡面 ,随坡面的陡、缓、凹 ,土壤侵蚀表现强、弱、沉积 ;相同坡度和坡长条件下 ,幼龄板栗园的土壤侵蚀速率 >雷竹园 >稀疏马尾松林地 >茶园 .

A new method of Fixed Soil Core Eu Tracer was founded to investigate the temporal and spatial distribution of soil erosion on red soil slope field under different land use patterns. The results show that the new method is applicable for red soil slope fields, on which, sheet and thin gully erosion are the main erosion forms. The temporal distribution of erosion was consistent with that of yearly rainfall, and the processing rainstorm period was the peak period of soil erosion in the whole year. On compound slope field, the soil erosion displayed strong, week and depositional on steep, gentle and concave slopes, respectively. At same slope degree and length, the soil erosion rate was decreased with the order of young chestnut garden>bamboo field>sparse masson pine forest land>tea garden.