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采用自制根盒培养法 ,以黑土和黑钙土研究了 2种基因型玉米苗期根际不同层次土壤pH、Eh变化 ,用Shuman的锌分组法研究了各形态锌在根际不同层次土壤中的分布、活化及有效性。结果表明 :近根际(0～ 2mm)与非根际相比其 pH和Eh下降 ;根际 0～ 1mm土层相对于 1～ 2mm土层DTPA -Zn的亏缺率在1 5 %～ 1 7%之间 ,可交换锌 (EX -Zn)的亏缺率约为 2 5 % ,黑土DTPA -Zn亏缺率高于黑钙土。玉米白单 9在黑钙土上对锌的活化能力高于四单 8,碳酸盐结合态锌 (CARB -Zn)和有机质结合态锌 (OM -Zn)也有类似的规律。以上各形态锌在根际 1～ 2mm以上区域有峰值 ,远根际区锌被活化较弱。根际无定形铁结合态锌(AFeOX -Zn)和结晶形铁结合态锌 (CFeOX -Zn)的有效性很低
The changes of soil pH and Eh in two rhizosphere soils at different seedling stages were studied by root-box cultivation method using black soil and chernozem. The changes of soil pH and Eh in different rhizosphere soil were studied by Shuman’s zinc grouping method. Distribution, activation and effectiveness. The results showed that the near-rhizosphere (0 ~ 2mm) decreased its pH and Eh compared with the non-rhizosphere soil. The deficit rate of DTPA-Zn from 0mm to 1mm in the rhizosphere was between 15% and 1% 7%. The deficit rate of exchangeable zinc (EX-Zn) is about 25%. The DTPA-Zn deficit rate of black soil is higher than that of chernozem. The activity of maize soba 9 on zinc was higher than that of Sidian 8 on the calcareous soil. Similar laws were also found for carbonate bound zinc (CARB-Zn) and organic-bound zinc (OM-Zn). The above forms of zinc in the rhizosphere 1 ~ 2mm above the peak area, far root zone zinc is activated weaker. Rhizosphere amorphous iron-bound zinc (AFeOX-Zn) and crystalline iron-bound zinc (CFeOX-Zn) are less effective