耕作改制对砂姜黑土微量元素的影响

The effect of cropping system on the microelements in lime concretion fluvo-aquic soils

研究旱作改水旱轮作对砂姜黑土中微量元素含量、有效性和赋存形态等的影响结果表明,砂姜黑土旱作改水旱轮作后,微量元素的总含量除Mo外,均呈贫化趋势且达显著水平;Cu、Fe、Mn和Mo的有效性明显提高,Zn的有效性降低,严重缺Zn可能限制作物产量提高;残留态、晶形铁态和碳酸盐态微量元素含量随旱作改水旱轮作时间的延续而降低,有机态和无定形铁态微量元素的含量则不断增加,代换态微量元素含量变化与有效态微量元素相似,呈两极分化,Cu和Ni增加,而Zn和Mn降低。

The paper discusses the influence of the changing of cropping system from upland farm-ing to rotation of rice and upland farming on the total contents,availability and morphology of mi-croelements in lime concretion fluvo-aquic soils analysed by sequential extracting method. The to-tal contents of microelements except molybdenum were remarkably decreased and the available contents of microelements except zinc were increased with the changing of cropping system from u-pland farming to rotation of rice and upland farming. The contents of residual, crystalline iron ox-ide bound and carbonate bound microelements were reduced and the contents of amorphous iron oxide bound and organically bound microelements were gradually increased and the changes of ex-changeable microelements were similar to that of available microelement contents.