恩施富硒土壤区土壤硒镉与其理化性质关系研究
Southwest China Journal of Agricultural Sciences（2019）
Abstract
[目的]为了研究湖北省恩施州富硒高镉土壤区土壤pH、有机质、CEC和土壤硒镉关系,揭示土壤理化性质对土壤硒镉含量的影响.[方法]以恩施州目前已经所做土地质量地球化学调查的区域,圈出富硒高镉土壤区,选择在区内采样分析的土壤数据,整理出土壤理化性质和对应的土壤硒镉元素及有效态硒镉数据,分析它们的关系及理化性质对土壤硒镉的影响.[结果]在恩施富硒高镉土壤区内,①土壤硒含量和土壤有机碳含量呈显著的正相关.第一等级有机质土壤中硒平均含量达到9.688 mg/kg,分别是第二、三、四等级的有机质土壤硒平均含量的5.32、8.8和4.67倍.②农作物根系土镉含量和土壤有机质含量呈显著的正相关,有机质第一等级的土壤中镉均值含量达到19.604 mg/kg,分别是第二、三、四等级有机质土壤镉含量的6.84、9.51和8.25倍.③土壤有效硒含量和土壤酸碱度呈显著的正相关.随着土壤的酸碱度等级上升,土壤有效态Se的含量显著上升(P=0.02968 ＜0.05),碱性土壤区间中有效态硒均值达到26.296 ng/kg,分别是中性、微酸、酸性、强酸性土壤区间的1.51、2.86、4.62、3.63倍.④农作物根系土壤酸碱度和土壤镉含量相关性不显著.⑤土壤有效态硒含量和土壤阳离子的线性关系不显著.⑥土壤镉含量和土壤阳离子交换量的线性关系不显著.[结论]研究认为恩施富硒高镉土壤区土壤有机质、土壤酸碱度显著影响土壤硒镉含量,有效态硒在碱性土壤中显著增多,农作物富硒种植可以适当增加土壤碱性,土壤阳离子交换量CEC对土壤硒镉含量的影响有限.
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