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本文通过长期定位施肥试验 ,分析了不同施肥结构对砂质潮土交换性钙、镁及有效硫、锌、锰、铜、铁等在 0～ 1 2 0cm土体中空间分布变化的影响 .结果表明 ,磷肥明显提高土壤交换性钙的含量 ,而有机肥与氮肥对土壤钙含量无明显影响 .但有机肥显著增加土壤交换性镁含量 ,各层镁含量与有机肥用量呈显著或极显著正相关 ,磷肥同样对土壤镁有提高作用 ,但氮肥无论是否与有机肥配施均降低了土壤各层交换性镁含量 .土壤 0～ 4 0cm有效锌、锰、铁均随有机肥增加而增加 ,并与有机肥用量呈极显著正相关 .而化肥无论是否与有机肥配施均降低土壤有效锌含量 ,但却增加了有效铁含量 .氮肥单施降低土壤有效锰含量 .在无有机肥情况下 ,施磷提高土壤有效铁含量 ,而在施有机肥条件下磷肥则降低耕层有效铁含量 .磷肥只在单施化肥时增加土壤有效锰含量
In this paper, through long-term fertilization experiments, the effects of different fertilization structures on the spatial distribution of exchangeable calcium and magnesium and available sulfur, zinc, manganese, copper and iron in sandy loam soil in 0 ~ 120cm soil were analyzed. Results The results showed that phosphate fertilizer significantly increased soil exchangeable calcium content, while organic fertilizer and nitrogen fertilizer had no significant effect on soil calcium content, but organic fertilizer significantly increased soil exchangeable magnesium content, and the contents of magnesium and organic fertilizer in all layers were significantly or very significantly positive Phosphate fertilizer also increased magnesium in soil, but the application of nitrogen fertilizer reduced the exchangeable magnesium content in all layers of soil, irrespective of the application of organic manure or not, the available zinc, manganese and iron of 0 ~ 40cm soil increased with the increase of organic manure, And had significant positive correlation with the amount of organic manure.The chemical fertilizers both reduced the effective zinc content of the soil with or without organic manure, but increased the effective iron content.Under the application of nitrogen fertilizer, the effective manganese content of soil decreased.Without organic manure , Phosphorus increased soil effective iron content, while under the condition of organic manure, phosphate fertilizer decreased the effective iron content of topsoil.Phosphate fertilizer only increased soil available manganese content