基于功能群对比分析黔中普定水库和桂家湖水库浮游植物群落结构特征   总被引：6，自引：1，他引：5  

胡月敏  李秋华  朱冲冲  欧腾  李红梅  陈峰峰  高永春  骆兰 《湖泊科学》2018,30(2):403-416

为了解黔中地区浮游植物群落结构特征,同时为了研究功能群对水环境的指示,选取黔中2座典型水库——普定水库和桂家湖水库,分别于2015年的枯水期(1月)和丰水期(8月)进行浮游植物采样分析.结果表明:(1)2座水库营养盐无显著性差异,水动力学参数(水温、混合层深度、透明度、真光层深度、水柱相对稳定性、光的可获得性)存在显著性差异.(2)普定水库共归类出18个功能类群,桂家湖水库共归类出15个功能类群.普定水库优势功能群水期分布特征:枯水期LO→丰水期B+P;桂家湖水库优势功能群水期分布特征:枯水期B+J+Y→丰水期B+J.垂直层面上,普定水库枯水期以甲藻组成的优势功能群LO在三岔街采样点表层藻类生物量达到峰值(18529μg/L),远高于中层和底层水体以及其他采样点,与该点水文特性以及组成LO的甲藻特征有关.丰水期以硅藻组成的功能群P在小河采样点的中层藻类生物量最大(2741μg/L),远高于该点的表层水体及其他采样点,与P类群耐受低光有关.而桂家湖水库由于面积小、水位浅且少有人为干扰,故样点间环境因子差异小,整个水体优势功能群分布高度一致.(3)经RDA分析,水动力学参数、营养盐、p H和电导率是影响普定水库浮游植物群落分布的主要环境因子;桂家湖水库仅水动力学参数(水温和水柱相对稳定性)是主要因子.(4)从浮游植物功能群适宜生境来看,普定水库为富营养水体,桂家湖水库为中到富营养水体.由分析得出隶属于不同水域的2座水库浮游植物群落结构及水环境均存在显著性差异.  相似文献   

基于GIS的海口海岸带空间功能分区研究          下载免费PDF全文

张旭  张继伟  陈凤桂  温瑞  高宇 《海洋开发与管理》2021,38(5):35-41

随着沿海地区经济的快速发展,海岸带空间资源的利用将呈现多样化的特征。海岸带空间功能分区可以优化海岸带空间资源配置,统筹协调海岸带空间开发与保护格局,是海岸带资源可持续利用的重要基础。文章针对海岸带空间的特殊性,构建指标体系,对海口海岸带进行模糊综合评价,探讨海口海岸带空间适宜功能类型,并基于GIS 技术进行功能分区。结果表明：海口海岸带主要功能空间类型为旅游娱乐空间、城镇建设空间、农林渔牧空间和生态保护空间,其面积占比分别为16.84%、21.18%、22.54%、35.77%。其中生态保护空间面积最大,主要分布在海口市东部片区的东寨港。  相似文献   

金沙江观音岩水库消落带绝对优势植物的表型可塑性与适应策略     

江维薇  查子霞  肖衡林 《湖泊科学》2024,36(1):261-273

金沙江是长江上游梯级大库富集之地,在金沙江地区选择典型水库开展植物表型可塑性和适应策略研究对该区一众水库生态治理具有重要的参考价值。本文以金沙江观音岩水库消落带为研究区,定量比较了经多年周期性水淹干扰后,绝对优势植物根茎叶性状的表型可塑性,分析了绝对优势植物应对主导因子的关键性状及其协同响应特征和权衡策略。结果表明:1)调查共记录了植物种类11科21属21种,优势度大于0.1的仅有狗牙根和苍耳,为绝对优势种。2)淹水对狗牙根和苍耳功能性状具有极显著影响,是二者功能性状变异的主导因子。3)狗牙根的株高、主茎长、分茎数量、主茎宽、叶片数量和叶面积,以及苍耳的分茎数量、叶片数量、根冠比和比叶面积的表型可塑性指数均超过0.6,是应对淹水的敏感性状。但是,狗牙根的叶片数量、叶面积以及苍耳的比叶面积对淹水的可塑性响应表现出短期时效性,为非适应性可塑性。4)淹水深度调控狗牙根在“逃避”策略和“静默”策略之间的权衡选择,并通过不同的性状组合以及地上和地下部分资源分配以协同响应。5)淹水导致狗牙根和苍耳的生态对策趋同,均采取S/SR策略。此外,相比于狗牙根为水库消落带的普遍推荐种,苍耳因其存在水质污染风险而褒贬不一,但苍耳具有重要的药用价值,能否在每次淹水来临前进行刈割值得进一步探讨。  相似文献   

Dynamics of phytoplankton associations in three reservoirs in northeastern Brazil assessed using Reynolds’ theory     

Ênio Wocyli Dantas  Maria do Carmo Bittencourt-OliveiraAriadne do Nascimento Moura 《Limnologica》2012,42(1):72-80

The aim of the present study was to evaluate the influence of seasonality on the behavior of phytoplankton associations in eutrophic reservoirs with different depths in northeastern Brazil. Five collections were carried out at each of the reservoirs at two depths (0.1 m and near the sediment) at three-month intervals in each season (dry and rainy). The phytoplankton samples were preserved in Lugol's solution and quantified under an inverted microscope for the determination of density values, which were subsequently converted to biomass values based on cellular biovolume and classified in phytoplankton associations. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. The data were investigated using canonical correspondence analysis. The influence of seasonality on the dynamics of the phytoplankton community was lesser in the deeper reservoirs. Depth affected the behavior of the algal associations. Variation in light availability was a determinant of changes in the phytoplankton structure. Urosolenia and Anabaena associations were more abundant in shallow ecosystems with a larger eutrophic zone, whereas the Microcystis association was more related to deep ecosystems with adequate availability of nutrients. The distribution of Cyclotella, Geitlerinema, Planktothrix, Pseudanabaena and Cylindrospermopsis associations was different from that seen in subtropical regions and the substitution of these associations was related to a reduction in the eutrophic zone rather than the mixture zone.  相似文献   

Phytoplankton based assessment of the ecological status of four shallow lakes (Eastern Poland) according to Water Framework Directive - a comparison of approaches   总被引：2，自引：0，他引：2  

Agnieszka Pasztaleniec  Ma?gorzata Poniewozik 《Limnologica》2010,40(3):251-3828

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Microdistribution of macroinvertebrates in a temporary pond of Central Italy: Taxonomic and functional analyses     

Marcello Bazzanti  Cristina Coccia  Maria Giuseppina Dowgiallo 《Limnologica》2010,40(4):291-299

Spatial distribution of physical and chemical variables and macroinvertebrate composition, structure and functional aspects were investigated in five microhabitats available (Ranunculus acquatilis+Ranunculus sardous, Spirogyra sp., Juncus effusus, and unvegetated littoral sediments and central sediments) in a temporary pond near Rome during spring 2004. The central sediments were found to differ greatly from the other substrates. They were characterized by higher nutrient contents (total P, total N), organic matter and organic C, and silt and clay in the sediments, and lower dissolved oxygen content and lower pH in the water. Species richness and densities of total macrofauna showed the lowest values in central sediments and the highest ones in submerged macrophytes (Ranunculus spp.) and emergent vegetation (Juncus effusus). Oligochaeta Tubificidae, some Nematoda (Dorylaimus spp.), and Chironomidae Tanypodinae (Procladius sp. and Psectrotanypus varius) and Chironominae (Chironomus plumosus group) characterized the central sediments, whereas Ephemeroptera and most of the Odonata and Coleoptera species were commonly found in submerged macrophyte beds. Some species of Coleoptera and Hemiptera (Hygrobia hermanni, Helochares lividus, Berosus signaticollis and Gerris maculatus) were mainly found in the algal substratum, and some Nematoda species (Tobrilus spp. and Aporcelaimellus obtusicaudatus), Oligochaeta Enchytraeidae, young larvae of Sympetrum and Diptera Ceratopogonidae in littoral sediments. Juncus effusus appeared to be mainly colonized by Chironomidae Orthocladiinae (Psectrocladius sordidellus group and Corynoneura scutellata) and Tanytarsini (Paratanytarsus sp.). Central sediments also favoured high abundances of collector-gatherers, burrowers and drought resistant forms with passive dispersal, whereas Ranunculus spp. hosted mainly scrapers, shredders, swimmers+divers and active dispersal forms without any resistant stages to desiccation. Juncus plants were mostly colonized by collector-filterers and by organisms capable of both active dispersal and surviving desiccation. Littoral sediments and algae showed similar functional organization and intermediate features between central sediments and submerged macrophyte beds. All these results demonstrate that microhabitat characteristics play a crucial role in selecting macroinvertebrate taxa according to their environmental requirement, feeding mechanism, movement and resistance to drought. Moreover, our study confirms the role of submerged and emergent vegetation in maintaining high biodiversity and suggests that all microhabitats should be considered to provide both an exhaustive collection of species for pond management and conservation and basic insights into the functioning of pond communities.  相似文献   

Water ecological function zoning in Heihe River Basin,Northwest China     

《Physics and Chemistry of the Earth》2016

Rapid urbanization coupled with increase in population growth rate in recent years has accelerated economic pressure on the ecological environment leading to a gradual deterioration of global and regional environment. This has particularly resulted into water contamination and shortage of water resources thus posing a great threat to human survival. How to guaranteeing sustainable use of basin water resources has attracted more and more attentions. The Heihe River Basin is the secondary longest river inland China and the significantly water source of Hexi Corridor, the problem of water pollution, ecological environment deterioration and the shortage of water has seriously threatened the ecological system of the Heihe River Basin. In this study, through depicting the characteristics of natural environment, human activities, water ecosystem services and other factors in Heihe River Basin we delineated the water ecological function in Heihe River using the principal components analysis and the K-means clustering method. In the study, Heihe River Basin is divided into 3 primary level areas and 8 secondary level sub-areas. Water ecological characteristics analysis showed that the spatial distribution of the water ecological function of Heihe River Basin was not uniform, which are mainly showed in three aspects, function of windproof and sand fixation, function of soil erosion prevention and function of water sources conservation. The results of this study can provide effective and scientific theoretical references for the integrated water sources management and the ecological function optimization of the Heihe River Basin.  相似文献   

Macrozoobenthic community of Fuxian Lake, the deepest lake of southwest China     

Yong-De Cui  Xue-Qin Liu  Hong-Zhu Wang   《Limnologica》2008,38(2):116-125

Located in the Yunnan–Guizhou Plateau in southwest China, Fuxian Lake covers an area of 211 km², with maximum depth of 155 m. It is known to have a unique fauna, including 14 described endemic species. In order to describe the zoobenthic community of the lake more completely, the present study was conducted from August 2002 to August 2003. Altogether 62 benthic taxa, including 22 oligochaetes, 21 molluscs and 18 insects were identified, of which the dominant taxa belonged to Potamothrix, Procladius and Paraprososthenia. The standing stocks of benthos were much higher in the littoral (824 ind/m² in density, 3.72 g/m² in biomass) than in the profundal region (23 ind/m² in density, 0.10 g/m² in biomass). Species richness was greatest in summer and standing stocks were larger in spring and summer than in other seasons. Analyses of functional feeding groups indicated that collector-gatherers and scrapers were predominant in entire lake. Stepwise multiple regression analysis demonstrated that the water depth is the most important factor affecting the distribution of macrozoobenthos.  相似文献   

环境因子对浮游甲壳动物群落功能多样性的影响     

王松波  史昭锦  耿红  吴来燕  曹艳敏 《湖泊科学》2021,33(4):1220-1229

基于功能性状的生物多样性分析是当前生态学研究中的常用方法之一.浮游动物作为水生态系统食物网的重要组成成分,其功能多样性受关注的程度远不如其重要性.本文通过对14个水体浮游甲壳动物群落结构的研究,分析了环境因子对其功能多样性指数,包括功能丰富度(FRic)、功能均匀度(FEve)、功能离散度(FDiv)和功能分散度(FD...  相似文献   

生物传感器综述     

崔桂媛 《成都信息工程学院学报》1993,(3)

本文介绍当前国际、国内生物传感器的发展及应用概况,并对生物传感器的市场前景和生物传感器技术的未来发展作了简单地论述。  相似文献