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研究了石灰性土壤上５种作物品种根际微生态环境中Ｆｅ、Ｍｎ的形态分布．结果表明，交换态Ｆｅ（ＥＸ－Ｆｅ）、碳酸盐结合态Ｆｅ（ＣＡＲＢ－Ｆｅ）、无定形氧化铁（ＡＯ－Ｆｅ）和交换态Ｍｎ（Ｅ－Ｍｎ）、碳酸盐结合态Ｍｎ（ＣＡＲＢ－Ｍｎ）在根际土壤中都呈现明显的累积．各品种根际中的累积量有较大差异．相关分析表明，黄潮土上植株含Ｆｅ量、吸Ｆｅ量与根际土壤ＡＯ－Ｆｅ含量呈显著正相关．根际有效态Ｆｅ累积不仅是根际ｐＨ作用的结果，与根系分泌物对难溶性Ｆｅ活化有关．根际有效态Ｍｎ累积则受到根际土壤Ｅｈ的影响．
The morphological distributions of Fe and Mn in the rhizosphere microenvironment of five crop cultivars on calcareous soils were studied. The results show that the exchangeable Fe (EX-Fe), carbonate-bound Fe (CARB-Fe), amorphous iron oxide (AO-Fe) and exchangeable Mn (E-Mn), carbonate bound Mn CARB-Mn) showed obvious accumulation in rhizosphere soil. The accumulation of rhizosphere in each species has a greater difference. Correlation analysis showed that there was a significant positive correlation between Fe content and AO-Fe content in rhizosphere soils on yellow soil. The accumulation of available Fe in rhizosphere is not only the result of rhizosphere pH, but also related to the activation of insoluble Fe by root exudates. Rhizosphere effective Mn accumulation is affected by rhizosphere soil Eh.