摘要
据谢良胜等的2篇文章报道,黔西北麻窝山岩溶盆地近29年来平均沉积厚度1.33 m,沉积速率4.6 cm/a,流域平均侵蚀模数为2 900.55 t/(km2.a)。而根据笔者的研究成果,该岩溶盆地中央部位沉积物剖面中,表征1963年沉积的137Cs峰值深度为40 cm,减去犁耕层深度,1963年以来的沉积厚度为20 cm,年均沉积速率为0.44 cm/a,此值仅为谢良胜等研究结果4.6 cm/a的1/10。
It was reported in recent two papers of Mr.Xie Liangsheng and his colleagues that the average sediment accumulation thickness in the Mawoshan Karst Basin was 1.33m for the last 29 years and the related average sediment accumulation rate was 4.6cm/a and the average erosion rate was 2900.55t/（km2·a） over the catchment.But according to our researches,in a sediment profile at the centre of the basin,the 137Cs peak occurred at the depth of 40cm,and the related sediment accumulation thickness since 1963 was 20cm by subtracting the plough depth and the related average sediment accumulation rate was 0.44cm/a,which was only one tenth of the rate of 4.6cm/a,reported by Mr Xie.
出处
《中国水土保持科学》
CSCD
2010年第6期93-94,共2页
Science of Soil and Water Conservation
基金
国家自然科学基金项目“基于扩散过程的137Cs2、10Pbex示踪土壤侵蚀速率模型改进”(40971169)
国家重点基础研究发展计划(973)项目“西南喀斯特山地土壤侵蚀过程与水土流失危险度评价”(2006CB403200)
中国科学院西部行动计划项目“西南喀斯特生态系统退化机制与适应性修复试验示范”(KZCX22XB2208)
中国科学院地球化学研究所环境地球化学国家重点实验室资助项目
关键词
岩溶盆地
137Cs
沉积物断代
质疑
黔西北
mawoshan karst basin
137Cs
sediment dating
questioning
Northwest Guizhou Province
