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    杨澜, 牛健植, 伦小秀, 朱思宇, 敖家坤. 不同栽植密度下金鱼藻对富营养化水体净化效果研究[J]. 北京林业大学学报, 2020, 42(9): 130-138. DOI: 10.12171/j.1000-1522.20190447
    引用本文: 杨澜, 牛健植, 伦小秀, 朱思宇, 敖家坤. 不同栽植密度下金鱼藻对富营养化水体净化效果研究[J]. 北京林业大学学报, 2020, 42(9): 130-138. DOI: 10.12171/j.1000-1522.20190447
    Yang Lan, Niu Jianzhi, Lun Xiaoxiu, Zhu Siyu, Ao Jiakun. Purification efficiency of Ceratophyllum demersum under different planting densities in eutrophic water[J]. Journal of Beijing Forestry University, 2020, 42(9): 130-138. DOI: 10.12171/j.1000-1522.20190447
    Citation: Yang Lan, Niu Jianzhi, Lun Xiaoxiu, Zhu Siyu, Ao Jiakun. Purification efficiency of Ceratophyllum demersum under different planting densities in eutrophic water[J]. Journal of Beijing Forestry University, 2020, 42(9): 130-138. DOI: 10.12171/j.1000-1522.20190447

    不同栽植密度下金鱼藻对富营养化水体净化效果研究

    Purification efficiency of Ceratophyllum demersum under different planting densities in eutrophic water

    • 摘要:
        目的  沉水植物金鱼藻是水体生态修复工程中常用的植物之一,其栽植密度直接影响富营养化水体的水质净化效果。因此,探究金鱼藻栽植密度对进行富营养化水体修复、加快水下森林发展具有重要意义。
        方法  本研究通过模拟栽植不同密度的金鱼藻对富营养化水体水质变化影响过程,分析6种栽植密度梯度(36、50、75、100、110、120 株/m2)金鱼藻对富营养化水体中氮、磷、有机污染物等污染物质的净化效果;并结合经济效益分析,筛选出最佳栽植密度,确定金鱼藻疏伐、收割时间。
        结果  结果表明,100 株/m2密度配置对应的植株成活率最高(95.65%),总氮去除率可达62.86%、总磷去除率可达74.32%,对氮磷等污染物吸收效果最佳,是金鱼藻在水生态修复工程中最佳种植密度。另外,金鱼藻在栽植后15 d内,其栽植密度越大,对富营养化水体中氮、磷、有机污染物等的去除效果越好,且溶解氧浓度越高;栽种50 d后,水体中各污染物含量均有回升,此时栽植密度越大,随植物衰败而释放到水体的氮、磷、有机物含量越高,溶解氧含量下降越迅速。
        结论  因此,利用金鱼藻开展水体修复时需要考虑最佳净化时效,及时收割。

       

      Abstract:
        Objective  The submerged plant Ceratophyllum demersum is one of the commonly used plants in water ecological restoration projects. Therefore, determining the planting density of C. demersum is of great significance to promote the restoration of eutrophic water and accelerate the development of underwater forests.
        Method  In this study, we simulated the different densities of C. demersum, and studied the characteristics of water quality changes under different planting densities and analyzed the purification efficiency of C. demersum on total nitrogen, total phosphorus and organic matter in eutrophic water under six planting densities (36, 50, 75, 100, 110, 120 plant/m2). Finally, combined with cost analysis, the optimal planting density was selected and the thinning and harvesting time of C. demersum was determined.
        Result  The plant corresponding to the density distribution of 100 plant/m2 had the highest survival rate (95.65%), with the total nitrogen removal rate of 62.86% and the total phosphorus removal rate of 74.32%. This density had the best effect on the absorption of pollutants such as nitrogen and phosphorus, and was the best planting density for aquatic ecological restoration projects. In addition, within 15 days after planting, the removal efficiency of nitrogen, phosphorus, chemical oxygen demand (COD) and other pollutants was better along with the increase of planting density in eutrophic water, and the dissolved oxygen concentration was higher. After 50 days of planting, the amount of pollutants in each configuration increased. At this time, a part of nitrogen, phosphorus and organic matter in C. demersum were released into the water with the decline of the plants, and the dissolved oxygen content decreased more rapidly.
        Conclusion  Therefore, it is necessary to consider the best purification time and timely harvest in the utilization of C. demersum to achieve water restoration.

       

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