| 引用本文: | 陈昊亮,吴玮,黄天寅,许晓毅,庄金龙.狐尾藻-鲢-铜锈石田螺组合系统对湖泊沉积物磷赋存特征的影响.湖泊科学,2024,36(6):1694-1705. DOI:10.18307/2024.0616 |
| Chen Haoliang,Wu Wei,Huang Tianyin,Xu Xiaoyi,Zhuang Jinlong.Effects of the combined system of Myriophyllum verticillatum-Hypophthalmichthys molitrix-Sinotaia aeruginosa on phosphorus characteristic in lake sediments. J. Lake Sci.2024,36(6):1694-1705. DOI:10.18307/2024.0616 |
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| 摘要: |
| 水生动植物生态系统构建对湖泊磷循环具有重要影响。通过开展微宇宙实验探究狐尾藻-鲢-铜锈石田螺(MHS)组合系统对沉积物磷的去除效果及其作用机制。结果表明:(1)狐尾藻对上覆水及沉积物中磷素的富集是系统去除磷素的主要途径,鲢和铜锈石田螺的协同作用可有效促进狐尾藻生长并强化其对磷的富集,与狐尾藻(M)、狐尾藻-鲢(MH)和狐尾藻-铜锈石田螺(MS)3种系统相比,MHS系统对上覆水及沉积物总磷的去除率分别提高了14.02%~54.53%和2.26%~5.33%。(2)沉积物磷的去除主要取决于植物根系对铁铝结合磷(Fe/Al-P)的吸收,实验周期内MHS系统对沉积物无机磷的总体去除率为13.60%,其中Fe/Al-P占87.83%,可有效降低沉积物磷向上覆水释放的风险。(3)16S rRNA基因测序表明,MHS系统可有效改善微生物生长环境,提高沉积物解磷菌(硫杆菌属(Thiobacillus)和假单胞菌属(Pseudomonas))的相对丰度,促进沉积物Ca-P向Fe/Al-P转化,提升植物根系对磷的吸收效率。本研究表明狐尾藻-鲢-铜锈石田螺组合系统在沉积物Fe/Al-P含量较高的湖泊中具有较好的应用前景,可有效去除湖泊中的磷污染物,降低湖泊富营养化风险。 |
| 关键词: 沉水植物 水生动物 沉积物 磷 |
| DOI：10.18307/2024.0616 |
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| 基金项目:江苏省苏州市水利科技项目(2022001)和苏州市科技计划项目(SS202218)联合资助。 |
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| Effects of the combined system of Myriophyllum verticillatum-Hypophthalmichthys molitrix-Sinotaia aeruginosa on phosphorus characteristic in lake sediments |
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Chen Haoliang, Wu Wei, Huang Tianyin, Xu Xiaoyi, Zhuang Jinlong
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School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, P. R. China
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| Abstract: |
| The construction of aquatic flora and fauna ecosystems significantly affects lake phosphorus cycling. Our investigation focused on the removal effect and mechanism of phosphorus in sediments using the combined system of Myriophyllum verticillatum-Hypophthalmichthys molitrix-Sinotaia aeruginosa (MHS). The experimental results indicated that: (1) The absorption of Myriophyllum verticillatum was the primary pathway for phosphorus removal in overlying water and sediments. Myriophyllum verticillatum's growth and its phosphorus enrichment were effectively promoted under the synergistic effect of Hypophthalmichthys molitrix and Sinotaia aeruginosa. Under the influence of the MHS system, the removal rate of total phosphorus (TP) in overlying water was 14.02%-54.53% higher compared to other systems(Myriophyllum verticillatum (M), Myriophyllum verticillatum-Hypophthalmichthys molitrix(MH), and Myriophyllum verticillatum-Sinotaia aeruginosa(MS). Correspondingly, the removal rate of TP in sediments was 2.26%-5.33% higher compared to other systems. (2) The TP removal in sediments depended mainly on the absorption of iron/aluminum bound phosphorus(Fe/Al-P) by Myriophyllum verticillatum. The removal rate of inorganic phosphorus(IP) in sediment by the MHS system during the experimental period was 13.60%, with Fe/Al-P accounted for 87.83%, effectively reduced the risk of phosphorus release from sediments to overlying water. (3) 16S rRNA gene analysis showed that the MHS system effectively improved the growth environment of microorganisms, increased the relative abundance of phosphorus solubilizing bacteria(Thiobacillus and Pseudomonas) in sediment, promoted the conversion of Ca-P to Fe/Al-P in sediment and improved the efficiency of phosphorus absorption by plant roots. The results of this study indicated that the synergistic effect of MHS could effectively remove phosphorus pollutants in overlying water and sediment, and has good application prospects in lakes with high Fe/Al-P content. It can provide a practical reference for pollution remediation and eutrophication control of shallow-water lakes. |
| Key words: Submerged plant aquatic fauna sediment phosphorus |
