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对河南郑州郊县不同种植年限保护地土壤速效氮、磷、钾及重金属铜、锌、镉、铅含量调查表明:随保护地种植年限的增加,速效氮、磷含量有显著的增加,其增加与种植年限呈极显著正相关,速效钾含量增加幅度不大,说明氮、磷、钾肥施用不均衡;重金属铜、锌、铅含量随保护地种植年限的增加有一定的增加,镉含量没有明显的规律性,但这几项重金属含量均比农田含量要高,说明在保护地高强度施肥及人为活动下,引入了重金属;农田及保护地重金属含量较土壤背景值均有一定程度的增加,但未超出国家土壤环境质量标准。
The investigation on available N, P, K and heavy metal contents of Cu, Zn, Cd, Pb in different planting years in suburb of Zhengzhou in Henan province shows that with the increase of planting time, the contents of available N and P increase obviously, Significantly positive correlations were observed with planting years and the increasing range of available potassium content was not significant, indicating that the application of nitrogen, phosphorus and potassium fertilizers was not balanced. The content of heavy metals copper, zinc and lead increased with the increase of planting years, However, the contents of these heavy metals were higher than those of farmland, which indicated that heavy metals were introduced under high-intensity fertilization in protected areas and man-made activities. The content of heavy metals in farmland and protected area increased to a certain extent compared with the background value of soil, But did not exceed the national soil environmental quality standards.