• 关键词：底栖藻  霍甫水丝蚓  营养盐  叶绿素a  溶解氧

• 基金项目：水体污染控制与治理科技重大专项（No.2017ZX07203-005）；国家自然科学基金（No.41571086，31370477，31170441）；中科院重点项目（No.KFZD-SW-302-02）

• 靳辉
• 1. 江南大学环境与土木工程学院, 无锡 214122;2. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008

• 谷娇
• 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008

• 蔡永久
• 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008

• 何虎
• 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008

• 宁晓雨
• 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008

• 沈睿杰
• 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008

• 杨桂军
• 江南大学环境与土木工程学院, 无锡 214122

• 李宽意
• 2. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;3. 中国科学院大学中丹学院, 北京 100049;4. 上海海洋大学水产与生命学院, 上海 201306

• 摘要：霍甫水丝蚓（Limnodrilus hoffmeisteri）是富营养化湖泊中的底栖动物优势种，通过生物扰动可以提高水体营养盐浓度，并促进浮游植物生长.富营养浅水湖泊经生态修复后，水体透明度会得到改善，有利于底栖藻快速生长，从而降低水体营养盐水平.那么，底栖藻能否抑制水丝蚓对富营养水体水质的不良影响？为此，本文开展了双因素（底栖藻和水丝蚓）的室外受控实验，结果表明：在无底栖藻处理中，水丝蚓显著提高了水体总氮（TN）、总磷（TP）、总溶解磷（TDP）和叶绿素a（Chl-a）浓度，同时显著降低水体溶解氧（DO）浓度；而在有底栖藻处理中，水丝蚓对水体TP、DO及Chl-a浓度的影响不显著.研究结果表明，水丝蚓的生物扰动提高了水体营养盐和浮游植物浓度，促进水体富营养化.但底栖藻群落的发展能在一定程度上抑制水丝蚓的生物扰动效应.

• Abstract：Limnodrilus hoffmeisteri is the dominant species of zoobenthos in the eutrophic lakes which could increase the nutrient concentration in the water though the bioturbation, meanwhile stimulate the growth of phytoplankton. After the implementation of ecological restoration project in the shallow eutrophic lake, the benthic algae will grow quickly due to the improvement of water transparency, resulting the decrease of nutrient concentration in the water because of the growth of the benthic algae. To explore whether the benthic algae could inhibit the negative effect of L. hoffmeisteri on the eutrophic water quality, a outdoor mesocosm was set up which include two-factors (L. hoffmeisteri and benthic algae). The results show that L. hoffmeisteri could increase the concentration of total nitrogen, total phosphorus, total dissolved phosphorus and Chl-a in water column remarkably when the benthic algae was absent. Furthermore, L. hoffmeisteri could decrease the concentration of dissolved oxygen remarkably. However, the L. hoffmeisteri did not show a significant effect on the total phosphorus, dissolved oxygen and Chl-a in water column when the benthic alage was present. This study shows that the bioturbation of L. hoffmeisteri could increase the concentration of both nutrient and phytoplankton in the water, which may promote the eutrophication.However, the development of benthic algae community could exert inhibiting effect on the bioturbation of L. hoffmeisteri.

• Key words：benthic algae  Limnodrilus hoffmeisteri  nutrient  chlorophyll a  dissolved oxygen

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