保山烟区植烟土壤有机质与腐殖质组分垂直分布特征

Vertical Profile Distribution of Soil Organic Matter and Humic Components in Tobacco-growing Soils in Baoshan

采集测定了云南省保山烟区5个主要植烟县318个代表性烟田耕层土样的有机质含量和25个代表性烟田剖面发生层土样的有机质含量及其腐殖质组分碳量,分析了有机质的丰缺、剖面垂直分布特征以及与土壤pH和成土母质的关系。研究结果表明,保山市植烟土壤有机质含量平均值为37.39 g/kg,变幅为6.20~150.09 g/kg,变异系数为52.32%;第四纪红土和岩类风化坡积物母质的烟田土壤有机质含量显著高于岩类风化残积物母质的烟田土壤;不同成土母质的烟田土壤有机质含量和腐殖质组分的碳量总体上随着土壤深度的增加均呈逐渐降低的趋势;土壤有机质含量与pH呈显著的负相关关系(r=-0.238,p<0.05)。

Plough-layer samples of318typical tobacco-growing fields and profile-horizon samples of25typical tobacco-growing fields were collected respectively from the5main tobacco-growing counties in Baoshan City of Yunnan Province in order to study the contents,spatial and profile distribution of organic matter,humus and its component carbon and their relationship with pH and soil parental materials.The results showed that the mean content of soil organic matter was37.39g/kg with a range from6.20to150.09g/kg,and the coefficient of variation was52.32%.The contents of soil organic matter in soil derived from the parental materials the Quaternary red clays and weathered slope washes were significantly higher than that derived from the weathered residuals.The contents of soil organic matter,humus and its component carbon in all profiles decreased with the increase of soil depth.The content of soil organic matter had a significant negative correlation with soil pH(r=?0.238,p<0.05).