施用改良剂对岩溶地区矿山污染农田土壤中锌生物有效性的影响

以玉米（ZeamaysL．）为研究对象，采用盆栽试验，观测在重金属锌污染的土壤（总锌含量为1412．1mg·kg0）上施用不同改良剂（石灰、石灰＋泥炭、石灰＋胡敏酸钠、石灰＋泥炭＋硅肥、石灰＋胡敏酸钠＋硅肥，分别简称S、SN、SH、SNG、SHG）对土壤锌形态、生物有效性及其在作物中富集的影响。结果表明，施用各种改良剂均显著提高土壤pH值，显著降低土壤弱酸可溶态锌和可还原态锌含量，提高可氧化态锌和残渣态锌含量；提高玉米生物量和产量，增产效果为SHG〉SNG〉SH〉SN〉S。施人改良剂可显著降低锌在玉米不同部位的吸收和转运，植株根、茎、叶、籽粒锌富集明显下降，以SHG、SNG的效果最明昂．S的效果最小。

Effect of amendments on Zn bioavailability in polluted soil and Zn accumulation in maize

A pot experiment of Maize （ Zea mays L. var. Haihe-14 ） was conducted to study the effect of different amendments （ Lime, Lime＋Peat, Lime＋Sodium Humate, Lime＋Peat＋Silicon fertilizer, Lime＋Natrium Humate＋Silicon fertilizer, which were la- beled as S ,SN, SH, SNG and SHG in short respectively ） on the bioavailability and chemical form of Zinc in soil, and the accumula- tion of Zn in the maize in the contaminated soil by Zn,whieh total Zn content is 1412.09 mg.kgl. The results showed that the appli- cation of different amendments significantly increased soil pH, significantly reduced the content of acid soluble Zn and reducible Zn, and increased the content of oxidable Zn and residual Zn; increased the biomass and yield of maize.The influence degree followed the order： SHG〉 SNG〉 SH 〉 SN 〉 S. The amendments utilization significantly reduced the uptake and transportation of Zn among different organs of maize, and also reduced significantly the accumulation of Zinc in root, stem, leaf and grain of maize. And in the treatments SHG and SNG were most effective amendments, while it was the least with S amendment.