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探讨了甘肃天水干旱地区刺槐、紫穗槐、黄花草木犀、紫花苜蓿和野豌豆五种豆科植物根际与非根际土壤Fe、Mn、Cu、Zn、B和Mo六种微量元素的含量特征。结果表明:(1)五种豆科植物根际土壤pH值均低于非根际土壤,表现出了不同程度的酸化作用。(2)根际全铁含量紫穗槐与野豌豆高于非根际;全锰含量只有黄花草木犀低于非根际;全锌在五种植物根际土壤均呈现出明显的富集效应,其中刺槐最高为244.291%;紫花苜蓿、野豌豆全铜含量略低于非根际;全硼除刺槐富集外其余植物均亏缺;全钼五种植物均低于非根际。(3)根际有效铁含量黄花草木犀与野豌豆低于非根际;紫穗槐和野豌豆根际有效锰含量低于非根际;有效锌只有紫穗槐略有富集,其余植物根际有效锌都呈现出明显亏缺;有效铜除野豌豆外的其余四种植物根际均有不同程度的富集,刺槐最高为200%;有效硼除刺槐亏缺外其余植物均有富集,其中紫花苜蓿最高为47.392%;有效钼只有刺槐与紫穗槐略有富集。(4)六种微量元素全量与有效量在五种豆科植物根际分布具有不同特征,植物根际对六种元素全量总体呈现富集效应,而对有效量有近一半呈现亏缺。(5)五种豆科植物根际与非根际土壤各微量元素养分之间有一定的相关性。
The contents of six trace elements Fe, Mn, Cu, Zn, B and Mo in rhizosphere and non-rhizosphere soil of five leguminous plants of Robinia pseudoacacia, Amorpha fruticosa, Rhodiola sibirica, alfalfa and wild pea feature. The results showed that: (1) The pH of rhizosphere soil of five leguminous plants was lower than that of non-rhizosphere soil, showing different degrees of acidification. (2) The total iron content in rhizosphere was higher than that in non-rhizosphere of Amorpha fruticosa and wild pea; the content of total manganese was only lower than that of non-rhizosphere of rhizome of rhynchophylla; total zinc showed obvious enrichment effect in the rhizosphere soils of five plant species, The highest content of Robinia pseudoacacia was 244.291%, while the content of total copper in alfalfa and Vicia aurea was slightly lower than that in non-rhizosphere. (3) The rhizosphere available iron content was lower than non-rhizosphere rhizoctonia and wild pea; rhizosphere and rhizosphere of Amorpha fruticosa and wild pea rhizosphere effective manganese content was less than that of non-rhizosphere; available zinc only Amorpha fruticosa slightly enriched, the other plant roots The available zinc showed a significant deficit; the available copper in addition to wild pea except for the other four plant rhizosphere are different levels of enrichment, the highest acacia 200%; available boron in addition to the lack of Robinia other plants are enriched , Of which the highest alfalfa 47.392%; available molybdenum only locust and Amorpha fruticosa slightly enriched. (4) The total and effective contents of six trace elements in rhizosphere distribution of five leguminous plants had different characteristics. The rhizosphere all showed the enrichment effect on the total amount of six elements, while almost half of the available amount showed the deficit. (5) There was a certain correlation between the nutrient contents of trace elements in rhizosphere and non-rhizosphere soil of five leguminous plants.