引用本文: | 印金凤,操瑜,吕超超,曹特,张圆,张毅成,秦靖,汤鑫.典型亚热带城市(武汉)湖泊修复中密刺苦草的生境需求分析.湖泊科学,2025,37(4):1357-1366. DOI:10.18307/2025.0431 |
| Yin Jinfeng,Cao Yu,Lv Chaochao,Cao Te,Zhang Yuan,Zhang Yicheng,Qin Jing,Tang Xin.Habitat requirements analysis ofVallisneria denseserrulataMakino in the lake restoration of typical subtropical city (Wuhan City). J. Lake Sci.2025,37(4):1357-1366. DOI:10.18307/2025.0431 |
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摘要: |
恢复沉水植被是城市富营养化湖泊生态修复的重要手段,了解沉水植物的生境需求是实现沉水植被有效恢复的重要基础。为探讨亚热带城市湖泊中沉水植物的生境需求,本研究选择武汉东湖、南湖和沙湖开展野外调查,以优势物种密刺苦草( Vallisneria denseserrulataMakino)为研究对象。研究测定了植物中长期生长(如生物量)、短期生理(如碳水化合物含量)、瞬时荧光共16个指标以及水体和底泥17个相关指标,通过结合广义加性模型(GAM)和植物性状网络分析(PTN)综合判断密刺苦草在武汉城市湖泊中的生境需求范围。结果表明:(1)3个城市湖泊的43个采样点中53.5%处于轻度富营养化,46.5%处于中度富营养化。(2)环境对密刺苦草生物量积累的影响比较显著。水深约为1.1 m、水体总氮浓度约为1 mg/L的条件最有利于密刺苦草的生长和生物量积累。底泥总氮含量在0.16~2.50 g/kg之间以及底泥总有机碳含量在0.19%~13.70%范围内会促进密刺苦草生物量的增加。(3)密刺苦草组织内的N∶P比值(平均值为3)表现出密刺苦草受环境养分中的氮限制。GAM结果表明密刺苦草的生长受水体总磷以及底泥总磷的影响很小,城市湖泊中的氮源对密刺苦草的重要性要大于磷源。(4)较高的水体营养水平往往会促进密刺苦草的短期碳氮积累,抑制密刺苦草的生长,而底泥有机碳含量对密刺苦草生长和繁殖的负面效应较弱。研究认为,未来在应用密刺苦草对亚热带城市湖泊进行修复时,需要更关注对水体生境条件的控制,尤其是氮源,从而最大化密刺苦草的生态效益,更有效地促进湖泊生态修复。 |
关键词: 武汉城市湖泊 密刺苦草 生态修复 生境需求 富营养化 |
DOI:10.18307/2025.0431 |
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文献标识码:A |
基金项目:神农架国家公园本底资源综合调查研究项目(SNJNP2022008)和神农架金丝猴保育生物学湖北省重点实验室开放课题基金项目(SNJGKL2022008)联合资助 |
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Habitat requirements analysis ofVallisneria denseserrulataMakino in the lake restoration of typical subtropical city (Wuhan City) |
Yin Jinfeng1,4,Cao Yu2,Lv Chaochao1,Cao Te1,Zhang Yuan3,Zhang Yicheng3,Qin Jing3,Tang Xin1
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1:Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072 , P.R.China,2:Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garde, Chinese Academy of Sciences, Wuhan 430074 ,P.R.China,3:Power China Hubei Engineering Co., Ltd., Wuhan 430040 ,P.R.China ,4:University of Chinese Academy of Sciences, Beijing 100049 ,P.R.China
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Abstract: |
The restoration of submerged vegetation plays an important role in the ecological restoration of eutrophic urban lakes, and the study on the habitat requirements of submerged vegetation is essential for their effective restoration. In order to investigate the habitat requirements of submerged macrophytes in subtropical urban lakes in China, three typical urban lakes in Wuhan, namely Lake Donghu, Lake Nanhu and Lake Shahu, were selected for field investigation in this study.Vallisneria denseserrulataMakino, a dominant species, was selected as the research object. The study measured 16 indicators ofV. denseserrulataMakino including medium to long-term growth (e.g. biomass), short-term physiology (e.g. carbohydrate content), and instantaneous fluorescence, along with 17 indicators related to water and sediment properties. By integrating generalized additive models (GAM) and plant trait network analysis (PTN), the study comprehensively assessed the habitat requirements ofV. denseserrulataMakino in urban lakes of Wuhan. Results showed that: (1) 53.5% of the 43 sampled sites in three urban lakes were mildly eutrophic, while 46.5% were moderately eutrophic. (2) Environmental factors significantly affected the biomass accumulation ofV. denseserrulataMakino. Conditions such as a water depth of approximately 1.1 m and a total nitrogen concentration of around 1 mg/L were most favorable for the growth and biomass accumulation ofV. denseserrulataMakino. Total nitrogen in the sediment ranging from 0.16 to 2.50 mg/kg and total organic carbon (TOC) in the sediment from 0.19% to 13.70% couldpromote biomass increase. (3) The N∶P ratio (average 3) inV. denseserrulataMakino tissue indicated that its growth was limited by nitrogen. GAM analysis showed that the growth ofV. denseserrulataMakino was minimally affected by total phosphorus in the water and sediment, and that nitrogen sources in urban lakes were more important toV. denseserrulataMakino than phosphorus sources. (4) Higher nutrient levels in the water often stimulated the short-term carbon and nitrogen metabolism ofV. denseserrulataMakino, but inhibited its long-term growth. The negative effect of sediment organic carbon content on the growth and reproduction ofV. denseserrulataMakino was relatively weak. The research suggests that in the future, when applyingV. denseserrulataMakino for the restoration of subtropical urban lakes, there should be a greater focus on controlling the aquatic habitat conditions, especially nitrogen sources, in order to maximize its ecological benefits and more effectively promote lake ecological restoration. |
Key words: Urban lakes in Wuhan City Vallisneria denseserrulataMakino Ecological restoration habitat requirements eutrophication |