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利用采自江苏省农业科学院果园的旱地黄棕壤(对照)和由黄棕壤发育水耕20年和60年的水稻土,研究了土壤黏粒和粉粒的矿物组成,胶体和土体的化学性质随水耕年限的变化。粉粒的X-射线衍射图谱表明,3种供试土壤发育母质相似,胶体的矿物组成随水耕年限的变化不大。动电电位和表面负电荷的测定结果也表明,胶体表面化学性质未发生明显变化。随水耕年限增加,土壤黏粒含量降低,导致土体性质发生明显变化,土壤CEC和结构电荷量随水耕年限增加显著减少。
The mineral composition, colloids and soil of clay and silt were studied by using yellow brown soil (control) from the orchards of Jiangsu Academy of Agricultural Sciences and paddy soils developed from yellow brown brown soil for 20 years and 60 years Chemical properties with changes in hydroponic years. X-ray diffraction patterns of the particles showed that the three parent soils developed similar parent materials, and the mineral composition of the colloids did not change much with hydroponics age. The determination of the electrokinetic potential and the surface negative charge also showed that the chemical properties of the colloid surface did not change significantly. With the increase of hydroponics age, the content of clay decreased, leading to significant changes in soil properties. The soil CEC and structure charge decreased with the increase of hydroponics years.