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首页> 外文期刊>Limnologica >Root-associated biofilms of Eichhornia heterosperma Alexander, 1939 contribute to the remediation of the tropical reservoir Porce II, Colombia
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Root-associated biofilms of Eichhornia heterosperma Alexander, 1939 contribute to the remediation of the tropical reservoir Porce II, Colombia

机译：Eichhornia heteroSperma亚历山大的根联生物膜，1939年为热带水库Porce II，哥伦比亚有助于修复

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摘要

Two key factors were identified that enhance remediation of a hypereutrophic reservoir colonised by Eichhornia heterosperma Alexander, 1939. These factors are the high abundance of the microbial community in root-associated biofilms and their high extracellular enzyme activity (EEA). The capacity of macrophytes for nutrients removal has been widely acknowledged. However, there has been little discussion on the role of root-associated biofilms in enhancing phytoremediation. We determined nutrient levels across the reservoir quarterly during two years. We assessed the structure of the microbial community in water, root-associated biofilms, and sediments along with their phosphatase and beta-glucosidase activities. We hypothesised that reservoir remediation is enhanced by increased nutrient remineralisation and bioavailability, arising from EEA in root-associated biofilms attached to E. heterosperma. Sedimentation removed 51% of the total nitrogen (TN) and 85% of the total phosphorus (TP) external load. E. heterosperma and its root-associated biofilms removed extra 8% TN and 7% TP. The abundance of the microbial community in root-associated biofilms was generally higher than in water and sediment, being dominated by Alphaproteobacteria and Betaproteobacteria. The EEA in root-associated biofilms ranged 117 -1760 mu mol g(-1) wet weight h(-1) for phosphatase and 107 - 676 mu mol g(-1) wet weight h(-1) for beta-glucosidase, indicating high mineralisation rates. These results showed that the microbial community in root-associated biofilms favours reservoir remediation by supplying mineralised nutrients to algae and macrophytes, but the permanent introduction of high nutrient loads exceeds the reservoir capacity for remediation. Improving the trophic state of the reservoir requires thus long-term strategies at basin scale for reducing the nutrient loads.
机译：确定了两种关键因素，提高由Eichhornia heteroSperma Alexander，1939年殖民殖民的过度型储层的修复。这些因素是根系相关生物膜中微生物群体的高丰度及其高细胞外酶活性（EEA）。营养成分的巨乳物质的能力已被广泛承认。然而，关于根系相关生物膜在增强植物化方面的作用几乎没有讨论。我们在两年内季刊上确定了水库的营养水平。我们评估了水，根系相关生物膜和沉积物中的微生物群落的结构以及它们的磷酸酶和β-葡糖苷酶活性。我们假设通过增加营养物质和生物利用度，从EEA中附着于E. heteroSperma的根系相关生物膜产生的营养物质和生物利用度提高了储层修复。沉淀消除了总氮（TN）的51％和总磷（TP）外部载荷的85％。 E. heteroSperma及其根系相关的生物膜除去额外的8％TN和7％TP。根系相关生物膜中的微生物群落的丰度通常高于水和沉积物，其主要由α-α-统治和贝替菌菌。根系相关的生物膜中的EEA为β-葡萄糖苷酶的磷酸酶和107-676μmolg（-1）湿重H（-1）湿重H（-1）。表明高矿化率。这些结果表明，通过向藻类和宏观物质供应矿化营养物，矿化营养物中的微生物群体有利于储层补充，但是高营养负荷的永久性引入超出了储层的修复能力。因此，提高储层的营养状态需要在盆地尺度下进行长期策略来减少营养负荷。

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