湖北秭归地区岩石-土壤-脐橙树系统中铜、锌元素的分布特征

Distribution of Zn and Cu in rock,soil and navel orange tree system in Zigui County,Hubei Province.

对湖北秭归地区脐橙生态区岩石-土壤-脐橙树系统中Cu、Zn元素分布特征的研究表明:脐橙果实中Cu和Zn的含量变化与母岩中的变化趋势相反,与土壤中Cu和Zn的变化趋势相关性不明显;系统中Cu和Zn的分布普遍存在偶数规律,且Zn/Cu有岩石→土壤→脐橙果实→干逐渐增大的变化特征,Zn和Cu元素在脐橙植物系统中生物地球化学循环发生了分异,其方向是喜Zn厌Cu。不同地区脐橙果实中Cu和Zn元素的生物富集系数之间存在明显线性关系,其回归方程为:Zn=0.006+0.024×Cu(R=0.96)。

The distribution of Zn and Cu in rock, soil and navel orange tree system in Zigui County was analyzed. Results show differing characteristics of Zn and Cu in navel orange fruits, rocks and soils of the system. The distribution of Zn and Cu follows the universal electrochemical displacement series in the system. Zn/Cu ratio in the system is in the order of rock〈 soil〈 navel orange fruits〈 navel orange stem. Biogeochemieal circulations of Zn and Cu are different in the system, with Zn always displacing Cu. Biological enrichment coefficient of Cu and Zn can be represented by a linear regression equation： Zn= 0.006 ＋ 0.024 × Cu（R = 0.96）.