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应用生态学报 ›› 1994, Vol. 5 ›› Issue (1): 62-67.

• 研究论文 • 上一篇    下一篇

石灰性土壤上植物根际中Fe、Mn的形态分布及其与植物吸收的关系

范晓晖, 施卫明, 刘芷宇   

  1. 中国科学院南京土壤研究所, 南京 210008
  • 收稿日期:1991-09-19 修回日期:1992-01-04 出版日期:1994-01-25 发布日期:1994-01-25
  • 基金资助:

    国家自然科学基金

Distribution and forms of iron and manganese in calcareous rhizosphere soils as related to plant uptake

Fan Xiaohui, Shi Weiming, Liu Zhiyu   

  1. Laboratory of Material Cycling in Pedosphere, Iustitute of Soil Sciences, Academia Sinica, Nanjing 210008
  • Received:1991-09-19 Revised:1992-01-04 Online:1994-01-25 Published:1994-01-25

摘要: 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(EX-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含量呈显着正相关。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。

关键词: 根际, 石灰性土壤, Fe、Mn形态分布, 景观生态风险, 重心迁移, CLUE-S模型, 太湖流域

Abstract: In this paper,the distribution and forms of Fe and Mn in rhizosphere soils planted with five varieties of crops were investigated by using the rhizobag system.The results show that exchangeable Fe(EX-Fe),carbonate-bound-Fe(CARB-Fe),amorphous Fe oxides(AO-Fe)and exchangeable Mn(EX-Mn),carbonate-bound-Mn(CARB-Mn)are accumulated significantly in rhizosphere soils.The amount of which are different among the rkizosphere soils of five crops.Correlation analysis shows that both the Fe content in the plants and the amount of Fe absorbed by plants are positively correlated with AO-Fe content in rhizosphere of yellow fluvo-aquic soil.Besides the influence of PH change in rhizosphere, the mobilization of insoluble Fe-by root exudates may be related to the accumulation of available Fe in rhizosphere.The accumulation of available Mn in rhizosphere is associated with rhizosphere Eh.

Key words: Rhizosphere Calcareous soil, Distribution and forms of iron and manganese, Taihu Lake basin., landscape ecological risk, CLUE-S model, shift of gravity center