摘要
本试验采用土壤恒温恒湿培养和土壤中锌的分组方法,研究碳酸钙对土壤中加入锌的形态转化以及 pH 值的影响,进而探讨碳酸钙对有效锌的影响。试验结果证明:碳酸钙可引起土壤pH 值上升,交换态锌下降以及碳酸盐结合态锌增加,从而使有效锌降低。在 CaCO_2含量1%左右时,各种形态锌分布及 pH 值对 CaCO_2增加较为敏感;在1%～7%时,其变化比较缓慢。
The investigation,by the fractionating method of soil Zn incubated at cons- tant temperature and humidity with different intervals,was undertaken to study the influences on the forms and transformation of soil Zn and pH value by cal- cium carbonate content9 and try to understand how the calcim carbonate affects on- availability of soil Zn.The results show that calcium carbonate can lead to inc-d reasing of soil pH value and cardonate bound Zn,decreasing of exchangeable Zn and DTPA-Zn.The form distribution of soil Zn and pH value was sensitively affecte- by calcium carbonate in about 1% carbonate content.From 1% to 7% of calcium carbonate contents,the change of soil Zn was slow.The result is valuable in eva luating the influenes on soil Zn by calcium carbonate.
关键词
土壤
碳酸钙
锌转化
calcium carbonate
soil
transformation of Zinc
