重庆市植烟土壤有效态微量元素含量评价

对重庆市14个县(区)的334个植烟土壤样品的有效态微量元素Fe、Mn、Cu、Zn、B和Mo的含量状况和分布特征进行分析,结果表明,重庆市20%以上植烟土壤缺Mo、Zn,75%以上土壤缺B,有效铁、锰含量较丰富,有效铜极丰富。有效铁、锰、铜、锌含量均与土壤pH值呈负相关关系,有效钼含量与土壤pH值呈正相关关系,有效硼含量在pH<7.0时随pH的增加而增加,但在pH>7.0时含量下降。植烟土壤中有效铁和有效铜含量与有机质含量呈极显著正相关关系,而有效锰、硼和钼与有机质无明显相关性。

Evaluation of available microelement contents in tobacco soils of Chongqing

Available contents of Fe,Mn,Cu,Zn,B and Mo in 334 soil samples taken from tobacco field in 14 counties in Chongqing were measured and distribution patterns were discussed.The results show that more than 20% of the tobacco fields are deficient in available Zn and Mo,while more than 75% have extremely low(nearly unavailable)amount of B.Available Fe and Mn is high,while the soils are quite rich in available Cu.A significantly negative correlation is observed between available Fe,Mn,Cu and Zn and soil pH,while there is a significantly positive correlation between Mo content and soil pH.When pH is below 7.0,available B content increases with increasing pH,but when pH exceeds 7.0,its content decreases.Available Fe and Cu contents have significant positive relationship with organic matter content of the tobacco soils,while available Mn,B and Mo have no significant relationship with tobacco soil organic matter content.