桂北地区柑桔园土壤、植株叶片及根的铜含量分析

Content of copper in soil,citrus leaves and branch roots of citrus orchards in northern Guangxi

为了对含铜肥料、农药的使用提供科学依据,对桂北地区柑桔园不同品种,不同树龄植株的叶片样品60个、根系样品60个和植株耕地表层土壤样品46个,进行铜含量分析。结果表明,桂北地区柑桔园植株叶片铜含量极不均匀,介于3.5～72.3 mg/kg之间,平均7.90 mg/kg;根系铜含量较丰富,平均19.83 mg/kg,无缺铜现象,也不存在过量的现象;土壤有效铜含量范围为0.80～22.41 mg/kg,平均6.37 mg/kg,为高含量水平;同时发现耕作层土壤有效铜含量与土壤成土母质、土壤pH值、土壤有机质含量有关;土壤有效铜与植株铜含量呈显著正相关关系。

In order to provide scientific guidance for the application of copper fertilizers and pesticides,the study carried out effective copper content analyses based on 60 samples of the leaves and roots respectively of different varieties and ages,as well as 46 surface soil samples within a series of citrus orchards in northern Guangxi.The results showed that the copper contents of leaves were highly uneven,ranging from 3.5 to 72.3 mg/kg with an average of 7.90.And that of roots,without excess as well as shortage,was relatively rich with an average of 19.83 mg/kg.The effective copper contents of the soils were at high levels ranging between 0.80 and 22.41 mg/kg with an average of 6.37 mg/kg,and was significantly positively correlated with that of the plants.Also found that the effective copper contents of the plow layer soils were significantly positively correlated with their parent materials,the pH values and organic matter content of the soils;Soil and plant copper content of copper was significantly positively correlated.