摘要
采用9个评价因子对12个耕作土壤的钾素状况进行了主组元分析,结果表明土壤阳离子代换量、钾位缓冲容量、钾交换选择性系数和非交换性钾含量可作为评价耕作土壤钾素状况的较理想的组合指标。根据第1和第2主组元方程可把耕作土壤的钾素状况分为3个类型。该分辩结果与土壤粘土矿物类型组成具有明显的相关性。第1类型土壤以蛭石为主,具有较强的吸钾和固钾能力,钾素有效性较低;第2类型土壤以高岭石为主,其吸钾和固钾能力较弱,但钾素的有效性却较高;第3类型土壤则以伊利石为主,其钾素状况则居于上述两者之间。
The potassium state of 12 cultivated soils was distinguished by principal component analysis with 9 evaluated factors. The results showed that soil cation capacity, potassium buffering capacity, potassium selectivity coefficient and the content of nonexchangeable potassium could be used as a better combinatorial index to evaluate the potassium state of cultivated soils. The potassium state of 12 cultivated soils could be divided into three groups by the equations of the first and second principal components, which correlated closely with the composition of clay minerals in the soils. The soil of the first group with predorminant-vermiculite showed higher capacity of potassium absorption and fixation, but lower potassium availability. The soils of the second group, consisting of kaolinitic soils, showed lower capacity of potassium absorption and fixation, but higher potassium abailability, and the others with most abundant illite showed mediate potassium state.
关键词
土壤钾素
主组元分析
粘土矿物
soil potassium
principal component analysis
clay mineral
