【摘要】 <正> 土壤颗粒组成决定着土壤的物理、化学和生物特性。不同的土壤机械组成,在矿物组成上有显著的差别,其化学成分和其它各种性质也均不相同。土壤机械组成对土壤中元素含量的影响,国内外曾有报道。但两者间相关性的研究报道不多。Ure曾研究过苏格兰10种土壤中61种元素之间的相关系数,讨论了元素与母质的关系。本文就天津更多还原

【Abstract】 The contents of CA, Hg, As, Cu, Zn, Pb, Co, Mn, Ni, Cr, Li, Fe, Ti, Ca, Sr and Zr in 91 samples of soils developed on alluvial deposits in Tianjin region were determined by X-ray fluorescence and colorimetry and their mechanical compositions were determined by gravimetry.The correlation between the contents of those elements and machanical compositions of the soils were studied, and the data obtained indicate that the soil particles with 0.01 mm diameter is a obvious critical limit. The contents of elements which are positively correlated with the content of physical sands (>0.01mm)of soil are inevitably negatively correlated with the content of physical clay particles (>0.01 mm) and vice versa. Therefore, it is unnecessary to distribute the sampling spots uniformly and it should be emphasized to consider the texture for sampling of soil in studying background of certain elements in the soils on the alluvial plain.In addition to the total background values of the elements in the soils, the determination of background values of elements in soil with various textures is of practical significance.更多还原