results of author's experiments show that this grade error tends to increase with the decrease of sampling volume and the increase of the boulder content as well as sorting coefficient of the placer.
笔者所做的砂金取样规格试验表明,砂金品位误差随着取样体积减小而增大。
the average size and sorting coefficient respectively indicate the size and stable state of the fluvial process.
平均粒径和分选系数分别反映了水动力的大小和稳定状态;
this paper illustrated ecological situation of intertidal zone sediment by size, sorting coefficient and the structure of benthic community.
本文从潮间带沉积物的粒径、分选系数及底栖生物群落结构阐明潮间带生态现状。