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大量的研究结果表明,农作物的直接磷源是土壤溶液中的磷,而液相中的磷和土壤固相表面吸附的磷有极为密切关系,这种关系可以用磷吸附等温线来表示。 关于土壤磷吸附的机制,目前一般认为有非专性吸附和专性吸附(配合基交换作用)两种,前者决定于土壤胶体正电荷,后者则与土壤铁、铝的氢氧化物或氧化物有关。三明地区土壤大多属于酸性土壤且富含铁铝氧化物和氢氧化物,因而上述两种吸附都可能广泛发生。 本研究目的在于:(1)阐明三明地区几种主要土壤(红壤和水稻土)的磷吸附特性;(2)利用磷吸附等温线予测土壤需磷量;(3)运用相关分析和直线回归技术研究磷吸附与土壤性质的关系。
A large number of studies have shown that the direct phosphorus source of crops is phosphorus in soil solution, while the phosphorus in the liquid phase has a very close relationship with the phosphorus adsorbed on the solid surface of soil. The relationship can be expressed by the phosphorus adsorption isotherm. About the mechanism of soil phosphorus adsorption, it is generally considered that there are two kinds of non-specific adsorption and specific adsorption (ligand exchange), the former is determined by the positive charge of soil colloids, the latter with soil iron, aluminum hydroxide or oxidation Related. Most of the soils in Sanming area are acidic soils and are rich in Fe-Al oxides and hydroxides, so both of these sorptions are likely to occur extensively. The purpose of this study is to: (1) elucidate the phosphorus adsorption characteristics of several main soils (red soils and paddy soils) in Sanming; (2) use phosphate adsorption isotherms to estimate soil phosphorus; (3) use correlation analysis and linear regression Relationship between Phosphate Adsorption and Soil Properties in Technical Research.