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根据土壤普查资料和实际采样测定结果,探讨了宁夏山区和灌区农田土壤耕层有机质和氮磷钾养分含量的时空变化特征。结果表明,在1970年、1985年和2000年3个时段内,土壤有机质、有效磷和碱解氮含量呈显著或较显著增长态势,土壤速效钾含量近15年在灌区明显下降,土壤氮磷钾全量养分在30年间没有明显变化。从两个地区比较来看,除土壤全磷量外,土壤有机质和其它养分含量都是灌区显著高于山区,而变异系数除土壤全钾外都是山区显著大于灌区。
Based on the soil census data and the actual sampling results, the spatio-temporal variations of soil organic matter, nitrogen, phosphorus and potassium in farmland soil in Ningxia mountainous area and irrigated area were discussed. The results showed that the content of soil organic matter, available phosphorus and available nitrogen increased significantly or significantly in three periods of 1970, 1985 and 2000. The content of available potassium in soil decreased significantly in the past 15 years in irrigated area, Total potassium nutrition in the 30 years did not change significantly. Comparing the two regions, soil organic matter and other nutrient contents were significantly higher in irrigated area than in mountainous area except for soil total P, and the coefficient of variation was significantly higher in mountainous area than in irrigated area except soil total potassium.