【摘要】 [目的]为研究曲靖市师宗县烤烟大田生长过程中烟田的土壤理化性状变化规律以及土壤肥力变化。[方法]对烟田土壤6个土层剖面的理化性状进行分析。[结果]在耕作层以下的土壤,随着土层的加深,土壤pH、速效氮、磷、钾含量、有机质、容重、阳离子交换量、总孔隙度、Ca2+和Mg2+下降,土壤肥力下降,通气性变差;土壤pH与土壤的速效养分、容重和阳离子交换量呈正相关关系,因此pH是影响土壤理化性状的重要因素之一。[结论]随着土层的加深,烟田土壤肥力下降越明显,理化性状越差,越不利于烤烟的生长。更多还原

【Abstract】 [Objective] The research aimed to study the changing regularity of soil physical and chemical properties and the soil fertility in tobacco field in Shizong County of Qujing City.[Method]Soil physical and chemical properties of six soil profiles were studied.[Result]Soil pH,content of available nitrogen,phosphorus,potassium,organic matter,bulk density,CEC,total porosity,Ca2+ and Mg2+ decreased with the deepening of the soil under the plough layer,and soil fertility decreased,the vent ability became poor.And there were positive correlation between soil pH and soil available nutrients,bulk density and CEC,so soil pH was one of the important factors who could affect soil physical and chemical properties.[Conclusion] With the increase of the soil depth,the decrease of soil fertility was more obvious,the physical and chemical properties in tobacco filed were poorer,which wasn’t beneficial for the tobacco growth.更多还原