农田土壤重金属季节性变化周期研究

Periodic Analysis of Seasonal Variation in Soil Heavy Metals

农田土壤重金属变化对于农田作物种植安全有着重要的影响。对山东省滨州市农田耕层土壤重金属Pb、Hg、Cd、Cr、Cu和类重金属As按照季度间隔进行了从2010年1月至2013年1月的采样测试。采用周期分析和快速傅里叶变换(FFT)谱分析方法计算各重金属的主分量周期,并做周期检验。研究表明农田土壤重金属具有不同程度的累积趋势,Pb具有2个季度的主分量周期,Cd和As具有4个季度的主分量周期,其他重金属主周期特征不明显。

The variation of heavy metal content in soils has important influence on cultivation security of crops.The concentrations of Pb,Hg,Cd,Cr,Cu and similar heavy metal As in arable soil were quarterly recorded in Binzhou of Shandong during the period from January 2010 to January 2013.The methods of periodic analysis and fast Fourier transform（FFT） spectral analysis were applied to calculate the principal component cycle of heavy metals,and to make further periodic test.The results showed that there was a different degree of accumulation trends in metals between the periods.The principal component cycle of Pb was two quarters in a year,Cd and As had four quarters as the main component cycle,and other heavy metals major cycle characteristics was not obvious.