| 引用本文: | 申声曼,曹艳敏,侯桂林,潘登,陈旭,王松波.神农架大九湖湿地摇蚊群落组成及其环境指示意义.湖泊科学,2024,36(1):286-297. DOI:10.18307/2024.0139 |
| Shen Shengman,Cao Yanmin,Hou Guilin,Pan Deng,Chen Xu,Wang Songbo.Chironomid community compositions and their environmental implications in the Dajiuhu Wetland, Shennongjia, China. J. Lake Sci.2024,36(1):286-297. DOI:10.18307/2024.0139 |
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| 神农架大九湖湿地摇蚊群落组成及其环境指示意义 |
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申声曼1, 曹艳敏1, 侯桂林1, 潘登1, 陈旭2, 王松波1
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1.中南民族大学资源与环境学院, 资源转化与污染控制国家民委重点实验室, 武汉 430074;2.中国地质大学(武汉), 流域关键带演化湖北省重点实验室, 武汉 430074
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| 摘要: |
| 泥炭地是一种水-陆过渡型的湿地生态系统。水体沼泽化过程中,植被等生物群落也随之改变,进而影响泥炭地碳埋藏和发育过程。作为泥炭地生态系统重要的次级生产者,摇蚊群落结构变迁可以为追溯泥炭地环境演变和发育历史提供关键线索。泥炭地在发育过程中将经历各种不同阶段,然而,现有的泥炭地摇蚊群落调查仅限于泥炭生境或泥炭地中开阔水域,较短的生境梯度不足以提供更为全面的摇蚊群落变化信息。神农架大九湖湿地包含泥炭地、湖泊、临时性水体等多种生境,本研究选择该湿地公园作为研究区域,通过采集不同生境的表层沉积物及水体样品,提取底泥亚化石摇蚊头壳,分析大九湖湿地中不同生境下的摇蚊群落结构差异,并对其与环境因子间的关系进行探讨。结果表明:1)大九湖湿地不同生境中摇蚊优势种迥异,泥炭藓藓丘生境中Limnophyes、Psilometriocnemus、Pseudosmittia等半陆生种类为主要优势种,湖泊生境中则以典型静水种Polypedilum nubeculosum-type为主要优势种,而过渡性水域(泥炭地洼地、沟渠及水洼生境)中,静水种与半陆生种共存;2)烧失量、水位埋深和pH是塑造不同生境类型下摇蚊群落结构的显著环境因子,水文条件主要通过改变碳积累过程等其他环境条件间接影响生物群落组成;3)沿水生-半陆生生境梯度,有机质含量和类型均发生显著变化,而摇蚊群落也由静水种、静水/半陆生共存转变为以半陆生种为主,摇蚊群落对生境变化表现出良好的响应过程。本研究揭示了不同生境条件下摇蚊群落的结构差异及影响摇蚊群落结构的潜在因子,为未来基于摇蚊的长时间尺度上泥炭地发育过程分析提供参考依据。 |
| 关键词: 摇蚊 泥炭地 水位埋深 碳累积 大九湖湿地 |
| DOI：10.18307/2024.0139 |
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| 基金项目:国家自然科学基金项目(41877428,42271165)、流域关键带演化湖北省重点实验室开放基金项目(2021F01)和中南民族大学中央高校基本科研业务费专项资金项目(CZQ23009)联合资助。 |
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| Chironomid community compositions and their environmental implications in the Dajiuhu Wetland, Shennongjia, China |
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Shen Shengman1, Cao Yanmin1, Hou Guilin1, Pan Deng1, Chen Xu2, Wang Songbo1
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1.Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission, College of Resources and Environmental Science, South-central Minzu University, Wuhan 430074, P.R. China;2.Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences, Wuhan 430074, P.R. China
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| Abstract: |
| Peatland is an aquatic-terrestrial transitional ecosystem. Its biological communities (e.g., vegetation) change during the process of swamping exerts significant impacts on carbon burial and peatland development. As an important secondary producer of peatland ecosystems, the change of chironomid community provides key clues for tracing the environmental change and developmental history of peatlands. However, the existing surveys on peatland chironomid communities are limited to peat habitats or open water in peatlands, but rarely carried out along multiple habitat gradients. The Dajiuhu Wetland, located in the Shennongjia Forestry District, encompasses a variety of habitats including peatlands, lakes, and temporary water bodies. In this study, surface sediments and water samples in different habitats were collected. We extracted the subfossil chironomids in the surface sediments to analyze the structural differences of midge community in different habitats. The relationships between the chironomid community and environmental factors were then explored. Our results revealed that: 1) the dominant chironomid taxa varied significantly between different habitats in the Dajiuhu Wetland. Semi-terrestrial taxa, such as Limnophyes, Psilometriocnemus and Pseudosmittia were the dominant taxa in the Sphagnum moss hummocks, while the typical lacustrine species (i.e., Polypedilum nubeculosum-type) dominated the communities in peat lake habitat. Lacustrine and semi-terrestrial taxa coexisted in transitional waters (Sphagnum moss hollows, ditches and ponds); 2) loss-on-ignition, depth to water table and pH were the key environmental factors in shaping chironomid communities in different habitats. Hydrological conditions indirectly influenced the chironomid community compositions primarily through their impacts on other environmental factors such as carbon accumulation process; and 3) the content and type of organic matter changed significantly along the gradient from aquatic to semi-terrestrial habitats, accompanying with the change of chironomid community from the coexistence of lacustrine and semi-terrestrial taxa to the dominance of semi-terrestrial taxa. The chironomid community responded well to habitat change in the Dajiuhu Wetland. This study revealed the differences of chironomid community between different habitats and the potential driving factors. It is expected to provide a scientific basis for future studies on historical peatland development at a long-term scale based on subfossil chironomids. |
| Key words: Chironomids peatland depth to water table carbon accumulation Dajiuhu Wetland |
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