摘要
运用１个样／１ｋｍ２、１个组合样／４ｋｍ２，１个样／（１００～１０００）ｋｍ２、１个样／（１０００～１００００）ｋｍ２的采样密度系统研究了泛滥平原沉积物的超低密度采样代表性。通过对Ｓｂ、Ａｓ、Ａｇ、Ｐｂ、Ｓｎ、Ｎａ２Ｏ元素的地球化学分布模式，Ｗ的地球化学特征在不同采样密度间的信息传递，证明了用１个样／（１０００～１００００）ｋｍ２的采样密度。
A hierarchical sampling pattern with three levels of 1 sample/1km 2, 1 sample/(100￣1000) km 2 and 1 sample/(1000-10 000) km 2 is designed, which is used to test the representativity of widespaced floodplain sediment sampling. The results are compared with the average values derived from calculating thousands of stream sediment data available from China′s National Geochemical Mapping (RGNR) program. Strong similarities are demonstrated in distribution and trends among the three levels of data. The set of floodplain sediment data shows great coincidence with RGNR stream sediment.
关键词
泛滥平原
沉积物
超低密度
采样代表性
地球化学
modern floodplain sediments, representativity of wide spaced sampling, geochemical pattern, Geochemical information transmission
