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为了解不同土壤质地和树龄条件下土壤中交换性Ca、Mg含量的变化规律,选择砂土、壤土两个类型的初果期、盛果期两种树龄核桃园,测定土壤交换性Ca、Mg含量。结果表明,不同土质中交换性Ca、Mg含量差异较大,壤土相对来说吸附、固持Ca~(2+)能力比较强,含量较高,与砂土质地土壤中交换性Ca、Mg含量的差异均达到显著水平(P<0.05)。壤土条件下不同树龄之间土壤交换性Ca、Mg含量也有较大的差异。土壤类型对土壤交换性Ca/Mg大小的变化有一定的影响。壤土与砂土之间Ca、Mg均呈现显著负相关,而同一土壤条件下Ca、Mg之间呈显著正相关。交换性Ca/Mg与交换性Mg含量呈显著负相关。
In order to understand the change rule of exchangeable Ca and Mg contents in soils under different soil texture and age, two types of early-fruiting period of sandy soil and loamy soil were selected, content. The results showed that the content of exchangeable Ca and Mg varied greatly among different soils. Loam was relatively stronger in adsorption and retention of Ca ~ (2+), and had higher content of exchangeable Ca and Mg than sandy soils The difference reached significant level (P <0.05). Soil exchangeable Ca, Mg content of soil under different soil conditions also have great differences. Soil type has some influence on the change of soil exchangeable Ca / Mg. There was a significant negative correlation between Ca and Mg between loam and sand, while there was a significant positive correlation between Ca and Mg under the same soil conditions. Exchangeable Ca / Mg and exchangeable Mg content showed a significant negative correlation.