两个地点土壤母质为河流冲积土.The parent material for the two locations is river alluvial soil.土壤分类为河流冲积土发育的潮汐沙土, 砂壤土质地.The soil is classified to tidal sandy soil, derived from river alluvium with sandy loam texture....

“冲积土”的英语可以翻译为：alluvium ...