郑州市城市土壤理化性质

在郑州市市区范围内采集53个0-20 cm土壤样品,研究了土样部分基本性状。结果表明,郑州市城市土壤有机碳含量为1.33-20.5 g/kg,平均值为8.01 g/kg;碱解氮含量为8.30-142 mg/kg,平均值为46.4 mg/kg;Olsen-P含量为2.40-70.4 mg/kg,平均值为21.8 mg/kg;pH值为7.70-8.95,平均值为8.36;城市化造成的土壤质地较粗对土壤有效性氮、磷提高和有机碳含量降低有一定贡献;土壤pH增加导致土壤有效磷含量降低;不同土地利用方式下土壤性质的对比表明,荒地质地粗、养分含量低、pH高;公园绿地和街边绿地土壤有效磷含量较高,街边绿地土壤有机碳含量较低。根据以上结果,减少土壤中粗骨性侵入体的含量和合理管理土壤磷对于郑州市城市土壤管理有现实意义。

Physical and Chemical Properties of Urban Soil in Zhengzhou City

There were 53 soil samples（0-20 cm） collected from the urban areas of Zhengzhou City and analyzed for selected physical and chemical properties.The results showed the soil organic carbon content ranged between 1.33-20.5 g/kg,averaged 8.01 g/kg;alkali-hydrolysable nitrogen ranged between 8.30-142 mg/kg,averaged 46.4 mg/kg;Olsen-P ranged between 2.40-70.4 mg/kg,averaged 21.8 mg/kg;pH ranged between 7.70-8.95,averaged 8.36.Relatively coarse texture of the soil because of urbanization resulted in higher nitrogen and phosphorus availability and lower soil organic carbon content.Higher pH in the soil resulted in lower phosphorus availability of the soil.Comparison of soil properties with different land utilization indicated that soil of wasteland had coarser texture,lower nutrient availability and higher pH,while soil of park and green belt beside street had lower nitrogen and phosphorus availability,organic carbon content of soil of green belt beside street was lower.Based on these results,the measures of reducing the coarse fill material in the soil and the risk of high phosphorus availability were important for urban soil management of Zhengzhou City.