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通过测定9种土壤类型g4个土样,研究福建省主要土壤类型全镁和交换性镁(包括水溶性镁)的含量及其影响因素。结果表明我省土壤镁素含量较低。除盐土外,土壤全镁含量平均为0.33％,交换性镁含量0.82毫克当量/100克土。不同土壤类型全镁量高低顺序为:盐土>紫色土>水稻土>黄红壤、红壤>山地黄壤、赤红壤>山地草甸土>风沙土。交换性镁高低顺序为:盐土>水稻土>风沙土>紫色土>山地黄壤>黄红壤>赤红壤、红壤>山地草甸土。成土母质对土壤全镁和交换性镁含量有一定影响。土壤交换性镁与全镁含量呈极显著正相关,与土壤有机质含量呈极显著负相关,与土壤pH值呈显著正相关,与土壤粘粒(<0.001毫米)含量和阳离子交换量(CEC)呈正相关,但不显著。以土壤交换性镁饱和度10％作为足量指标进行划分:盐土和风沙土镁素充足,水稻土有75％样点土壤不缺镁,紫色土有50％样点土壤供镁充足,而红壤性土壤有80～90％样点土壤缺镁,山地草甸土镁素都是不足的。
The contents of total and exchangeable magnesium (including water-soluble magnesium) in major soil types and their influencing factors in Fujian Province were studied by measuring 9 soil samples of 9 g soil samples. The results showed that the soil magnesium content in our province is low. Desalinated soil, the average soil magnesium content of 0.33%, exchangeable magnesium content of 0.82 mg equivalent / 100 grams of soil. The order of the total amount of magnesium in different soil types was: saline soil> purple soil> paddy soil> yellow-red soil, red soil> yellow earth, red earth> mountain meadow soil> aeolian sandy soil. The order of exchangeable magnesium was saline soil> paddy soil> aeolian soil> purple soil> yellow earth in mountainous area> yellow-red soil> latosolic soil, red soil> mountain meadow soil. Soil parent material has some influence on total magnesium and exchangeable magnesium content in soil. There was a significant positive correlation between soil exchangeable magnesium and total magnesium, negatively correlated with soil organic matter, and significant positive correlation with soil pH, with soil clay (<0.001mm) and cation exchange capacity (CEC) Positive correlation, but not significant. Soil magnesium content of 10% of soil exchangeability as a sufficient indicator of division: saline and windy soil sufficient magnesium, paddy soil 75% of the soil is not lacking magnesium, purple soil 50% of the sample is sufficient for magnesium, and red soil There are 80 ~ 90% of soil samples of soil magnesium deficiency, mountain meadow soil magnesium are inadequate.