侵蚀沉积物基本性质的研究

Studies on The Properties Of Eroded Sediment

本文对英国中西部地区１９８５年至１９８６年间壤质砂土上冲刷下来的土壤沉积物基本性质进行了研究。结果表明，土壤沉积物中粘粒、粉粒、砂粒和大石砾含量分别是１．９８％，１３．０７％，８３．２８％和１．６７％（ｎ＝８４），养分元素为Ｃａ０．２０％，Ｆｅ１２３％，Ｋ１．８５％，Ｍｇ０．４９％，Ｍｎ０．０２％，Ｐ０．０６％，Ｃｕ＜１２０ｍｇ．ｋｇ￣（－１），Ｓ４３．０ｍｇｋｇ￣（－１），有机质含量为１．６５％ｐＨ值是５１４（Ｈ＿２Ｏ）和５．０１（０．０１ＭＣａＣｌ＿２），从１９８５年１２月１９日至１９８６年１２月１９日在十个径流小区所收集的侵蚀土壤沉积物来看，土壤的颗粒组成、有机质含量、ｐＨ值均随时间而变化，表现为沉积物中的细粒部分含量增加、有机质含量增加、ｐＨ值下降。研究结果还发现，坡度和沉积物颗粒组成之间、沉积物的有机质含量和颗粒组成之间有显著的相关性。

The properties of Sediment eroded from the Loamy sand soils in West mid-lands,UK were studied.The results showed the contents of clay,silt,sand and coarsefraction of the sediment were 1.98%,13.07%, 83.28%and 1.67%(n=84)respectively.Nutrient contents were Ca 0.20%, Fc 1.23%,K1.85%,Mg 0.49%,Mn0.02%,P0.06%,Cu < 12mg·kg-1,S < 43.0mg·kg-1.Organic matter content was1.59.PH Values were 5.14(H2O)and 5.01(0.01M Cac 12)From 19 /12/1985 to 19/12/1986,Soil Particle size distribution,organic matter contents,pH Values ofSediments were changed:the fine fractions and organic matter content increased,PHvalues decreased.The relationships between organic matter content and particle size,slope angle and particle size were examined。