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通过测定我省六个土类77个土样的代换性钾、钙、镁的含量,明确了不同土类的三种元素含量都不高,红壤尤其缺乏。代换性钾含量占阳离子总量的16%,代换性镁占20%,而代换性钙略高,占38%。K/Ca 为0.43me/100克土,K/Mg 为0.83me/100克土,表明我省主要土类中钾含量水平比钙、镁低。地区分布情况是南亚热带钾含量较低,钙、镁含量较高,而中亚热带钾含量较高,钙、镁含量较低。土壤剖面中的分布,大部份土壤中钾、钙、镁都有向土壤下层移动富集的趋势,这也是土壤缺乏钾、钙、镁的原因之一。统计分析表明,代换性钾与有机质含量之间呈明显的正相关,而代换性钙、镁与有机质含量之间呈明显的负相关。这三者含量均随土壤中 pH 值的降低而减少,呈明显的正相关。
By determining the content of substitution potassium, calcium and magnesium in 77 soil samples of six soil types in our province, it is clear that the contents of three elements in different soil types are not high, and the red soil is especially scarce. Replacement potassium content accounted for 16% of the total amount of cation, substitutional magnesium accounted for 20%, while the substitutional calcium slightly higher, accounting for 38%. K / Ca is 0.43me / 100 grams of soil, K / Mg is 0.83me / 100 grams of soil, indicating that the main soil potassium levels in our province than calcium and magnesium low. The regional distribution is that the potassium in the south subtropical zone is lower, the content of calcium and magnesium is higher, while the content of potassium in the middle subtropical zone is higher while the content of calcium and magnesium is lower. Distribution in the soil profile, most of the soil potassium, calcium and magnesium have moved to the underlying soil enrichment trend, which is also the lack of soil potassium, calcium, magnesium one of the reasons. Statistical analysis showed that there was a significant positive correlation between substitutional K and organic matter content, while substitution Ca, Mg and organic matter content showed a significant negative correlation. The contents of these three all decreased with the decrease of pH in soil, showing a significant positive correlation.