土壤有机矿质复合体研究 Ⅴ.胶散复合体组成和生成条件的剖析

STUDIES ON ORGANO-MINERAL COMPLEXES IN SOIL V. DTSTRIBUTION OF ORGANO-MINERAL COMPLEXES IN ZONAL SOILS OF CHINA

Thirteen satttples of typical zonal soil were collected from whole China to study the distribution of the organemineral complexes separated by the fractional peptization method. The total amount of organo-mineral complexes (G₀+G₁+G₂) was significantly correlated with the content of clay particles in soil. The content of G₁ fraction decreased but that of G₂ fraction increased from north to south. The ratio of G₁ to G₂, ranging from 0.25 to 12.35, gradually decreased from north to south. The correlation coefficients between organo,mineral complexes and soil-forming factors, mineral elements, humus composition and basic properties of different soils were calculated. G₁/G₂ ratio was positively related to latitude, but negatively to the mean annual temperature and rainfall, the content of Gl fraction was positively correlated with total Mg and Ca, degree of Ca saturation, pH and CEC, and G₂ fraction was positively related with total Fe and Al, free and complex Fe and Al, but negatively with degree of Ca saturation, pH, and CEC. In addition, G₁/G₂ ratio was positively related to HA/FA ratio. It was thus revealed that the distribution of organo-mineral complexes (G₁ and G₂)was related to the forming conditions and properties of zonal soils. Therefore, the content of organo-mineral complexes and G₁/G₂ ratio could be used as a reference for soil classification.