【摘 要】
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该文根据锌是动植物必须的微量元素,过量时又是污染土壤的重金属的特性,通过培养试验研究了四种土壤中锌的形态分布及土壤对锌的恒温吸附作用.研究结果表明:原始土壤中残留态
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该文根据锌是动植物必须的微量元素,过量时又是污染土壤的重金属的特性,通过培养试验研究了四种土壤中锌的形态分布及土壤对锌的恒温吸附作用.研究结果表明:原始土壤中残留态锌和氧化铁态锌占90%以上,而其它形态的锌不到10%.土壤加入外源锌后,各种形态锌的绝对含量均提高,相对含量除交换态锌和氧化锰态锌提高外,其它形态锌则有所下降.在加入外源锌的土壤中施入石灰和过磷酸钙后,两者都显著降低了交换态锌含量.施入新鲜猪粪和褐煤后,使交换态锌有所降低,有机态锌有不同程度提高.锌的恒温吸附试验表明,不同土壤对锌的恒温吸附在Langmuir、Temkin和Freundlich三种方程中,以与Freundlich方程拟合最好.通过盆栽试验和田间试验,初步探讨了湖南省砂岩红壤和第四纪红土红壤上玉米施锌的生物效应.田间试验的研究结果表明:在湖南常宁县有效锌(0.1MHCI浸提)为4.34mg/kg的砂岩红壤上,亩施锌肥0.9-1.8kg,有利于米玉的生长发育,使玉米增产5.09%-6.82%,尤以亩施0.9kg锌肥增长率最高,但施锌过多反使产量下降.盆栽试验表明,施锌浓度大于600mg/kg土时,玉米幼苗明显表现出中毒症状.
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