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采用 Mehlich(1960) 法测定了天宝山垂直带8个土样的 CEC_p、CECv 和 AEC。结果表明:①土壤 CEC_p 主要与土壤粘粒含量和粘土矿物组成有关。含水云母和蛭石较多的土壤其CEC_p 也较高;而含1. 4nm 过渡矿物、绿泥石和高岭石较多的土壤其 CEC_p 较低。②随海拔升高,土壤 CEC_v 趋于增加,主要与土壤有机质和无定形铝(铁)氧化物含量随海拔增加有关。③土壤AEC 随海拔升高而增加。AEC 与土壤表面羟基释放量显著正相关,主要是由土壤中无定形铝(铁)氧化物含量决定的。
Mehlich (1960) method was used to determine the CEC_p, CECv and AEC of 8 soil samples in the vertical belt of Tianbao Mountain. The results showed that: (1) Soil CEC_p was mainly related to soil clay content and clay mineral composition. CEC_p was also higher in soil with more mica and vermiculite, while CEC_p was lower in soil with 1. 4nm transitional mineral, chlorite and kaolinite. (2) CEC_v tends to increase with elevation above sea level, mainly related to soil organic matter and amorphous aluminum (iron) oxide content with elevation. ③ soil AEC increases with elevation. AEC has a significant positive correlation with soil hydroxyl release, which is mainly determined by the content of amorphous aluminum (iron) in the soil.