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利用长期定位试验,研究了有机肥和氮、磷、钾肥不同配施方式对保护地土壤钙素形态分布的影响。研究结果表明:有机肥的施入增加了保护地土壤全钙含量。随着施氮肥数量的增加,土壤水溶性钙含量增加,土壤全钙、吸附性钙和酸溶性钙含量均呈现下降趋势。施钾肥对土壤中钙素形态分布的影响较小。含钙磷肥的施入增加了土壤全钙的含量,但对其它形态钙素分布的影响规律性不明显。土壤pH值与全钙和吸附性钙含量之间呈显著正相关关系,与水溶性钙呈显著的负相关关系。土壤有机质与全钙和非酸溶性钙之间呈显著正相关关系,与水溶性钙呈极显著负相关关系。
Long-term experiment was conducted to study the effects of different manners of application of organic manure and nitrogen, phosphorus and potassium fertilizers on the distribution of soil calcium forms in protected soils. The results showed that the application of organic manure increased the total calcium content in the protected soil. With the increase of nitrogen application amount, the content of soil water-soluble calcium increased, and the contents of soil total calcium, adsorptive calcium and acid-soluble calcium all showed a downward trend. Potassium fertilizer had little effect on the distribution of calcium in soil. The application of calcium and phosphate fertilizers increased the content of soil total calcium, but the regularity of the influence on the distribution of other forms of calcium was insignificant. There was a significant positive correlation between soil pH and the content of total calcium and adsorbed calcium, but negatively correlated with water-soluble calcium. There was a significant positive correlation between soil organic matter and total calcium and non-acid soluble calcium, and significant negative correlation with water-soluble calcium.