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对甘肃省榆中县20个乡镇的6个土壤肥力因子1987年第二次土壤普查的结果和2006年土样检测结果进行了成对数据假设测验,以判定这6项指标的变化程度,并简要分析了土壤养分变化的原因。结果表明,6个指标中,pH值、全氮、碱解氮、有效磷、速效钾含量2006年与1987年之间差异达到显著或极显著水平,有机质含量差异未达到显著水平。经过近20 a的耕作,土壤全氮含量增加0.22 g/kg(P<0.01),碱解氮含量增加33.24 mg/kg(P<0.01),有效磷含量增加19.01 mg/kg(P<0.01),pH值下降0.32(P<0.05),速效钾含量下降50.73 mg/kg(P<0.01),有机质含量下降0.58 g/kg(P>0.05)。
Six pairs of soil fertility factors in 20 villages and towns of Yuzhong County, Gansu Province were tested by paired data from the results of the second soil survey in 1987 and the soil samples taken in 2006 to determine the degree of change of the six indicators The reason of soil nutrient change is briefly analyzed. The results showed that among the six indicators, the differences of pH, total nitrogen, available nitrogen, available phosphorus and available potassium reached significant or extremely significant levels between 2006 and 1987, and the difference of organic matter content did not reach significant level. After nearly 20 years of cultivation, soil total nitrogen content increased by 0.22 g / kg (P <0.01), total nitrogen content increased by 33.24 mg / kg (P <0.01) and available phosphorus content increased by 19.01 mg / kg , pH value decreased 0.32 (P <0.05), available potassium content decreased 50.73 mg / kg (P <0.01), and organic matter content decreased 0.58 g / kg (P> 0.05).