济阳县土壤元素有效量及其影响因素研究

通过对济阳县生态地球化学调查研究,该区受成土母质来源、土壤类型、地形地貌及其理化性质等因素影响,土壤元素全量、有效量及有效度表现为：低平洼地土壤中K,P,N,Se,Mn,Fe,Zn,Cu和Mo全量较高,P,N,Se和Cu有效量较高,显示为低平洼地为黏质成分的沉积成因特点;而决口扇形地区土壤Cu,Mo,N,Zn,B有效量和全量均偏低。富含有机质,且pH相对较低的潮土中Se,Cu,Mo和B等元素有效度较高,贫有机质、pH相对较高的草甸风沙土中N,Fe,Cu,Mo,B和S等元素有效量较低,但K有效量和有效度均较高。统计分析表明,土壤中K,P,N,S和Cu等元素全量与有效量间具显著正相关性,表明全量是有效量的重要影响控制因素;有机质含量与K,P,Zn,Cu和B有效度间为显著正相关,说明有机质较高有利于土壤元素活化;Fe,P,S,Zn,B和Cu有效度与pH值为显著负相关,表明土壤酸性增强会增加这类元素的生物有效性。

Study on Available Contents and Influencing Factors of Soil Elements In Jiyang County

Through study on ecological and geochemical survey in Jiyang county, it is regarded that due to the influences of parent rocks, soil types, topography and physical and chemical properties, total contents, available contents and available degrees of soil elements are ： in downfold soil, the total contents of K, P, N, Se, Mn, Fe, Zn, Cu and Mo are rather high, and available contents of P, N, Se and Cu are rather high. It shows the characteristics of sedimentary origin with viscid composition ; the available contents and total contents of Cu, Mo, N, Zn and B are lower in soil of crevasse fan - shaped area. In the fluvo - aquic soils with rich organic matters and relative lower pH value, the available degree of Se, Cu, Mo and B are higher, in the bedding aeolian sandy soil with poor organic matters and relative higher pH value, the available contents of N, Fe, Cu, Mo, B and S are lower, but the available contents and available degree of K are rather high. As showed by statistic analysis, it is found that the total contents and available contents of K, P, N, S and Cu are obvious positive correlation. It shows that the total contents are main influence and control factors for available contents, the organic matters contents and available degree of K, P, Zn, Cu and B are obviously positive correlation. It shows that high contents of organic matters are favorable for elements activation in soil; the pH value and the available degree of Fe, P, S, Zn, B and Cu are obvious negative correlation. It shows that incresing acidity of soil can enhance the biology validity of those elements.