• 关键词：菹草  再生水河道  收割强度  沉水植物  水质

• 基金项目：国家水体污染控制与治理科技重大专项（No.2017ZX07102-001）

• 闫雨婷
• 河海大学水文水资源学院，南京 210098;北京市水科学技术研究院，北京 100048

• 谷黄河
• 河海大学水文水资源学院，南京 210098

• 李添雨
• 北京市水科学技术研究院，北京 100048

• 何春利
• 北京市水科学技术研究院，北京 100048

• 杨艳红
• 北京市水科学技术研究院，北京 100048;北京市官厅水库管理处，张家口 075441

• 王帅
• 北京沐尘环境技术有限公司，北京 101403

• 黄炳彬
• 北京市水科学技术研究院，北京 100048

• 摘要：在北京地区典型再生水补水型河道开展试验，通过在菹草（Potamogeton crispus）生长期对其进行基于生物量控制条件下的不同收割强度处理，研究光照强度等环境影响因子、菹草生长特征、浮游动物及底栖动物分布的响应机制，以期为北京再生水补水型河道提供生态修复技术支撑与沉水植物管控方案.结果表明：①菹草收割强度对水体浊度影响较小，总体维持河道原有状态，介于1.64~4.98 NTU.但对河道内光照强度梯度分布有较大的影响，表现为高强度收割之后底层水体光照强度变大而上层水体基本稳定.②随着收割强度的增加，菹草的芽孢数量、侧芽位置及数量、生物量显著减少，说明经高强度收割后，菹草再生长能力受到抑制能有效控制过量繁殖问题.③菹草收割强度不同，对浮游动物影响较小，但对底栖动物群落结构会产生较大的影响，表现为过高强度收割菹草后，底栖动物由原本清洁种为优势种的群落结构转为中污种为优势种的底栖动物群落结构.④建议再生水补水型河道内菹草收割强度为：每年进行两次收割，3月中下旬进行第1次收割，收割后植株维持50 cm高度；4月下旬进行第2次收割，收割后植株维持60 cm高度.

• Abstract：Experiments were conducted on typical river refilled with reclaimed water in Beijing to study the response mechanism of environmental factors such as light intensity， growth characteristics， zooplankton and benthos distribution by applying different harvesting intensity treatments based on biomass control during the growth period of Potamogeton crispus. The purpose is to provide technical support for ecological restoration and submerged plant control scheme for rivers refilled with reclaimed water in Beijing. The results showed that ①The harvesting intensity of tobacco had little influence on water turbidity， and generally maintained the original state of the river which ranging from 1.64 to 4.98 NTU. However， the gradient distribution of light intensity in the river has a greater influence， which shows that the light intensity of bottom water body becomes larger and the upper water body is basically stable after high harvest intensity.②With the increase of harvesting intensity， the number of spores， position and quantity of side buds and biomass of Potamogeton crispus decreased significantly. This indicated that the regeneration and growth ability of tobacco were inhibited and the problem of excessive reproduction could be effectively controlled after harvesting with high intensity. ③Different harvesting intensities of Potamogeton crispus have little influence on zooplankton， but will have a greater influence on the community structure of benthos. After harvesting tobacco with high intensity， the dominant benthic species of benthos changed from clean species to medium pollution species. ④It is recommended that the harvesting intensity of Potamogeton crispus in the river refilled with reclaimed water is two harvests a year. The first harvest in the mid-to-late March， and plant maintains a height of 50 cm after harvest. The second harvest in late April， the plant height was maintained at 60 cm.

• Key words：Potamogeton crispus  reclaimed water  harvesting intensity  submerged plants  water quality

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