Present status and changes of the phytoplankton community after invasion of Neosalanx taihuensis since 1982 in a deep oligotrophic plateau lake, Lake Fuxian in the subtropical China

Introduction Introduction of exotic fish from the Yangtze River tolakes of Yunnan Guizhou Plateau has led to significantecological consequences of the lake ecosystem. So far, mostconcerns have been on the extinction of endemic fish species(Y…     

水绵（Spirogyra）对蓝藻复苏及藻类群落结构的影响

通过采集富营养化水体中的底泥与上覆水,在自然光照条件下建立了模拟自然水体的实验装置,并设置了高（42mg.L-1）、低（21mg.L-1）、空白（0mg.L-1）3个水平的水绵添加量,研究了不同剂量的水绵对水华蓝藻（以微囊藻为主）复苏过程及藻类群落结构的影响,同时考察了充足的营养盐在实验中所起的作用.整个实验在藻类的复...     

互花米草入侵对河口湿地土壤真菌群落结构及多样性影响

河口湿地是遭受互花米草入侵的主要区域,为了探究互花米草入侵对河口湿地土壤真菌的影响,以秋茄湿地、芦苇湿地,白骨壤湿地3种典型的湿地为研究对象,借助高通量测序技术对其土壤真菌丰富度及多样性进行分析.结果表明：①白骨壤湿地受到入侵后,土壤盐度、含水量、容重均发生了显著的变化（p<0.05）;②子囊菌门（Ascomycota）相对丰度在互花米草入侵红树林湿地和芦苇湿地后变化均较大,秋茄湿地土壤组织胞浆菌属（Histoplasma）相对丰度降低;芦苇湿地土壤假丝酵母菌属（Pseudeurotium）相对丰度有所增加;③互花米草入侵白骨壤湿地后,土壤真菌多样性升高;互花米草入侵秋茄和芦苇湿地后,土壤真菌多样性降低;④互花米草入侵白骨壤湿地和芦苇湿地后土壤真菌群落结构差异最大;⑤环境因子能够影响湿地土壤中真菌的相对丰度,Talaromyces的相对丰度与土壤盐度呈显著正相关（p<0.01）,Penicillium的相对丰度与土壤含水量呈显著正相关（p<0.01）,Pseudeurotium、Toxicocladosporium与土壤pH呈显著负相关（p<0.01）.本研究可为治理互花米草过程中微生物多样性的保育提供重要的数据支撑.     

Spatial heterogeneity of cyanobacterial communities and genetic variation of Microcystis populations within large, shallow eutrophic lakes (Lake Taihu and Lake Chaohu, China)

Cyanobacteria, specifically Microcystis, usually form massive blooms in eutrophic freshwater lakes. Cyanobacterial samples were collected from eight sites of both Lake Taihu and Lake Chaohu in late summer to determine the diversity and distribution pattern of cyanobacteria and Microcystis in large, shallow, entropic lakes with significant spatial heterogeneity and long-term Microcystis bloom. Molecular methods based on denaturing gradient gel electrophoresis and clone library analysis were used. A similar heterogeneous distribution pattern of cyanobacteria in both lakes was observed. Most parts of these two lakes with high trophic level were dominated by Microcystis. However, in the regions with low trophic levels as well as low concentrations of chlorophyll a, Synechococcus occupied a considerable percentage. Different morphospecies and genotypes dominated the bloom-forming Microcystis populations in these two lakes. Microcystis viridis and Microcystis novacekii were dominant in Lake Chaohu, whereas Microcystis flos-aquae was dominant in Lake Taihu. Only 2 of the13 Microcystis operational taxonomic units were shared between these two lakes. Analysis of molecular variance based on 16S to 23S internal transcribed spacer sequences indicated the significant genetic differentiation of Microcystis between these two lakes (F_st = 0.19, p < 0.001). However, only 19.46% of the genetic variability was explained by the population variation between lakes, whereas most (80.54%) of the genetic variability occurred within the lakes. Phylogenetic analysis revealed no phylogeographic structure of Microcystis population in these two lakes, as illustrated by their cosmopolitan nature. Our results revealed that spatial heterogeneity within lakes has more impact on the cyanobacterial diversity than geographical isolation in a local scale.     

菹草种群对湖泊水质空间分布的影响

对南京玄武湖菹草种群内外水体进行了26 h连续理化指标监测及分析,研究菹草种群对湖泊水体的环境效应.结果表明,表层水体DO最高值(11.85 mg/L)、最低值(9.90 mg//L)均出现在种群内,种群外水域DO含量随与种群距离增加而递减;种群内及开阔水域表层与底层DO差异较小,而种群与开阔水域交界处表层与底层DO差...     

闽江河口互花米草海向入侵对湿地土壤nirS型反硝化微生物群落结构及多样性的影响

2020年秋季,在闽江河口鳝鱼滩东部的互花米草分布区,由陆向海方向选择互花米草海向入侵前的光滩(MF)、入侵1～2年的互花米草湿地(SAN)和入侵6～7年的互花米草湿地(SA)为研究对象.基于高通量测序技术,探讨了互花米草海向入侵对土壤nir S型反硝化微生物群落结构及多样性的影响.结果表明,变形菌门(Proteobacteria)均是互花米草不同入侵阶段土壤中nir S型反硝化微生物的优势门(90.41%～97.36%),其次是厚壁菌门(Firmicutes)和放线菌门(Actinobacteria),三者在SAN和MF土壤中的丰度均与SA存在显著差异(p<0.05).不同入侵阶段土壤中共有的nir S型反硝化细菌属为假单胞菌属(Pseudomonas)、芽孢杆菌属(Bacillus)、偶氮弧菌属(Azoarcus)、陶厄氏菌属(Thauera)、Sulfurifustis属、副球菌属(Paracoccus)、鲁杰氏菌属(Ruegeria)、红肠命菌属(Rubrivivax)、趋磁螺菌属(Magnetospirillum)和福格斯氏菌属(Vogesella),其中,假单胞菌属是...     

不同营养环境下棕鞭藻共栖细菌的群落结构比较

微藻富含油脂,可以用作合成生物柴油的原料,被认为是最具发展前景的生物质能源.微藻的光合培养体系往往是非纯培养体系,现有研究更多地关注微藻生物量的积累及其对废水环境的净化效果,而对体系中广泛存在的共栖细菌缺乏全面深入的认知.本文通过对棕鞭藻共栖细菌的16S rDNA基因进行高通量测序分析,研究棕鞭藻（Ochromonas）在生活废水、BG11及Glu+BG11（BG11中添加10 g·L^-1葡萄糖）3种不同营养环境中共栖细菌的群落结构差异,进而阐明有机物及复杂废水环境对微藻共栖细菌群落结构的影响效果.结果表明,生活废水、BG11及Glu+BG11 3种营养环境中共栖细菌群落结构存在显著差异,生活废水体系中生物多样性显著高于BG11及Glu+BG11体系,生活废水中共栖细菌香浓（Shannon）多样性指数高达4.32,其次是BG11及Glu+BG11,Shannon指数分别为2.13、1.54.从共栖细菌群落的组成上看,3种营养环境中优势菌属差异显著,生活废水中优势菌属有芽殖杆菌属（Gemmobacter）、鞘脂单胞菌属（Sphingomonas）及玫瑰球菌属（Roseococcus）,相对丰度分别为14.46%、14.9%、14.54%,其中,芽殖杆菌属只在生活废水中有较高丰度.BG11中寡养单胞菌属（Stenotrophomonas）与玫瑰球菌属的丰度分别高达26.86%、51.03%.Glu+BG11中寡养单胞菌属较BG11中显著增加,达到82.41%,而玫瑰球菌属较生活废水及BG11中则明显降低,菌群丰度仅为6.2%.对比3种营养环境,玫瑰球菌属均具有较高丰度,是棕鞭藻良好的共生菌.     

互花米草入侵对河口湿地土壤细菌群落结构及多样性影响

本研究以闽江口秋茄湿地、漳江口白骨壤湿地和闽江口芦苇湿地为研究地点,采集土壤样品并通过高通量测序分析了土壤细菌的群落结构及其多样性,以此探讨互花米草入侵对河口湿地土壤细菌群落结构的影响.结果表明：①互花米草入侵河口湿地后,改变了湿地土壤细菌种类的相对丰度,且入侵不同的湿地群落,细菌优势菌属及相对丰度具有差异;②互花米草入侵秋茄和芦苇湿地后使土壤细菌多样性升高,互花米草入侵白骨壤湿地后使土壤细菌多样性降低;③互花米草入侵并未明显改变细菌门水平的群落组成,湿地土壤主要的细菌门为变形菌门（Proteobacteria）、厚壁菌门（Firmicutes）、绿弯菌门（Chloroflexi）、酸杆菌门（Acidobacteria）、拟杆菌门（Bacteroidetes）;④互花米草入侵改变了湿地土壤细菌的优势菌属,使白骨壤湿地土壤Ruminococcus_2、Faecalibacterium的相对丰度降低,同时白骨壤湿地土壤出现了Thiohalophilus、Hallea等优势菌属;⑤环境因子和活性碳组分能够影响湿地土壤中细菌的相对丰度,细菌Thiohalophilus的相对丰度与湿地土壤盐度呈显著正相关（p<0.05）,Sideroxydans的相对丰度与湿地土壤pH呈显著负相关（p<0.01）,Ruminococcus_2的相对丰度与土壤易分解有机碳（LOC）呈显著负相关（p<0.01）;Blautia、Bacteroidess的相对丰度与土壤可溶性有机碳（DOC）呈显著正相关（p<0.01）.本研究可为深入研究互花米草入侵机制及生态影响提供重要科学依据.     

互花米草入侵对河口湿地铁还原菌群落结构及多样性影响

互花米草是河口湿地典型的入侵物种,为了探究互花米草入侵对河口湿地铁还原菌群落结构及多样性影响,以闽江口秋茄湿地、闽江口芦苇湿地和漳江口白骨壤湿地3个典型的湿地为研究对象,分别对互花米草入侵前后土壤铁还原菌群落进行测定与分析.结果表明：①互花米草入侵使白骨壤湿地和芦苇湿地土壤铁还原菌多样性升高,使秋茄湿地铁还原菌多样性降低;②互花米草入侵白骨壤湿地后拟杆菌门（Bacteroidetes）相对丰度显著降低,变形菌门（Proteobacteria）铁还原菌的相对丰度显著提高（p<0.05）;③互花米草入侵使湿地土壤铁还原菌的优势菌属发生演替.互花米草入侵后,秋茄湿地中优势菌属除硫单胞菌（Desulfuromonas）的丰度显著降低成为非优势菌属,而厌氧粘细菌（Anaeromyxobacter）的丰度显著提高成为第三优势菌属;白骨壤湿地中互花米草入侵后拟杆菌属（Bacteroides）的丰度显著降低成为非优势菌属;④环境因子及碳组分影响湿地土壤铁还原菌的相对丰度,Geobacter的相对丰度与可溶性有机碳、土壤微生物量碳均呈显著负相关（p<0.01）,Halothiobacillus的相对丰度与土壤总有机碳（SOC）呈显著正相关（p<0.05）,与土壤微生物量碳（MBC）呈显著负相关（p<0.05）.研究结果可为治理互花米草过程中微生物多样性的恢复提供科学依据.     

互花米草入侵对河口湿地土壤环境中铁氧化菌群落结构及多样性影响

以闽江口秋茄湿地、芦苇湿地及漳江口白骨壤湿地作为研究对象,通过高通量测序技术对互花米草入侵湿地前、后土壤铁氧化菌群落结构及其多样性进行测定与分析,以此探讨互花米草入侵对河口湿地土壤铁氧化菌的影响.结果表明：(1)不同类型的河口湿地土壤中铁氧化菌数量对互花米草入侵后的反应不同,互花米草入侵闽江口秋茄湿地和芦苇湿地后,湿地土壤铁氧化菌数量均显著增加（p<0.05）;而入侵漳江口白骨壤湿地后,湿地土壤铁氧化菌数量显著降低（p<0.05）;(2)互花米草入侵使秋茄湿地铁氧化菌多样性提高,使白骨壤湿地和芦苇湿地土壤铁氧化菌多样性降低;(3)变形菌门（Proteobacteria）铁氧化菌是湿地优势菌门,尤其是互花米草入侵秋茄湿地后,其变形菌门铁氧化菌的相对丰度明显提高,而脱硫杆菌门（Desulfobacterota）铁氧化菌的相对丰度降低;(4)互花米草入侵后,秋茄湿地中优势菌地杆菌属（Geobacter）铁氧化菌的丰度显著降低,而沙雷氏菌属（Sediminibacterium）的丰度显著提高;芦苇湿地中互花米草入侵后披毛菌属（Gallionella）的丰度显著提高;(5)盐度、pH...     

闽江口互花米草入侵过程对短叶茳芏沼泽沉积物硝化-反硝化作用的影响

2014年4、7、10月和2015年1月在闽江口鳝鱼滩湿地选择未被入侵的短叶茳芏(Cyperus malaccensis)群落(A)、互花米草入侵斑块边缘(B)以及互花米草(Spartina alterniflora)入侵斑块中央(C)为研究对象,基于时空互代研究方法,探讨互花米草入侵序列下湿地沉积物硝化-反硝化变化规律.结果表明:在互花米草入侵序列中,湿地沉积物硝化速率为0.19~1.66μmol·m~(-2)·h~(-1),反硝化速率为12.41~27.19μmol·m~(-2)·h~(-1).沉积物硝化-反硝化作用存在明显的季节变化,硝化速率表现为夏季春季秋季冬季,反硝化速率表现为夏季秋季冬季春季;入侵不同状态下,沉积物硝化速率表现为BCA,反硝化速率表现为CBA.互花米草入侵提高了沉积物-水界面N_2O交换通量.互花米草入侵引起的沉积物pH、NH_4~+-N、含水量、容重和电导率等理化性质的改变是导致不同入侵阶段沉积物硝化-反硝化速率以及N_2O释放差异的重要原因.     

鄱阳湖流域水葫芦(Eichhornia crassipes)对水体微塑料的吸附截留效应

微塑料是环境中的新型污染物,随着人们对微塑料污染的认识,微塑料在河流和湖泊等淡水湿地环境中的迁移问题受到普遍关注.中国内陆最大淡水湖鄱阳湖湿地受五河流域及其地表径流的影响,湿地水环境中的微塑料污染问题也不容忽视.为了解鄱阳湖各流域水体中微塑料的分布现状及水生植物对微塑料的吸附截留效应,选择鄱阳湖流域的赣江、信江、抚河、修水和饶河这五河水系入湖段为研究区,以各流域水体及其普遍存在的漂浮植物水葫芦（Eichhornia crassipes）为研究对象,分析鄱阳湖五河流域水葫芦对水体微塑料的吸附截留特征,探讨水生植物对水体环境中的微塑料是否具有吸附或截留效应,阐明水葫芦对微塑料的吸附与水体赋存微塑料的相关性,解析微塑料在湿地环境中的迁移特性,为鄱阳湖湿地环境中微塑料的管控及污染治理提供一定的理论基础与依据.在鄱阳湖流域赣江、抚河、信江、饶河和修水的五河水系入湖区和湖口出湖区共设置18个采样点,分别采集水表漂浮的水葫芦整株样品和水深约1 m处的水样,采用HNO₃（65%）-H₂ O₂（30%）混合试剂消解水样后抽滤分离水体及水葫芦体表微塑料;采用显微鉴定方法观察微塑料的颜色、粒径和形态等特征,采用Nano Measurer 1.2软件统计各流域水体和水葫芦体表中分离出的微塑料丰度;采用傅立叶变换红外（FTIR）光谱仪鉴定不同形态微塑料的聚合物成分.鄱阳湖流域各水体微塑料丰度处于中度偏高水平,丰度范围为65.5~353 n ·L^-1,且以0~0.5 mm范围内的小粒径微塑料为主,占各流域水体中微塑料的80%以上;各流域水葫芦截留或吸附的微塑料丰度范围为36~204 n ·kg^-1,且以0~1.5 mm范围内的小粒径微塑料为主,所占比例达80%以上;水葫芦吸附0~0.5 mm粒径范围内的微塑料丰度含量与水体中0~0.5 mm粒径范围内的微塑料丰度间呈显著相关,水葫芦对水体中占比较高的小粒径微塑料具有明显的吸附效应.鄱阳湖五河流域水体微塑料的聚合物成分以聚乙烯和聚苯乙烯为主体;各流域水体微塑料的丰度处于较高水平,以0~0.5 mm的小粒径微塑料为主,对水体生物及水环境易构成生态风险.各流域水葫芦对水体微塑料具有显著的吸附效应,且以吸附0~1.5 mm的小粒径微塑料为主;水葫芦吸附0~0.5 mm粒径范围内的微塑料丰度值与水体中0~0.5 mm粒径范围内的微塑料丰度间存在显著相关性;水葫芦对水体中的小粒径微塑料具有较强的吸附效应,可为水生植物吸附或截留水体环境中的微塑料提供一定的参考依据.     

Effects of Oxalis pes-caprae L. invasion in olive groves

The present work aimed at studying the effect of Oxalis pes-caprae invasion in the herbaceous understory of olive groves in the island of Lesvos, Greece. The number of species, their biomass and dead plant material production was followed throughout the vegetative period in invaded and non-invaded plots. Species richness in the area invaded by O. pes-caprae gradually declined and was significantly smaller in comparison with the natural vegetation. Although biomass was equal in the invaded and non-invaded areas 1 month after germination, annual net primary production (NPP) was three times smaller in the invaded than the non-invaded area. Moreover, aboveground dead plant material of O. pes-caprae decomposed faster than a mixture of litter species of the natural vegetation. Lower biomass production in combination with increased decomposition rates of O. pes-caprae is expected to lead to reduced soil C sequestration in invaded areas. It was concluded that although O. pes-caprae does not add a new life form or functional type to the invaded herbaceous system it has considerable impacts on the diversity and ecosystem functions in olive groves.     

芦苇抑藻化感物质的分离及其抑制蛋白核小球藻效果研究

采用乙醇提取、溶剂萃取法从芦苇中分离出2组能抑制蛋白核小球藻生长的化感物质. 该2组化感物质对蛋白核小球藻的半效应浓度(EC₅₀)分别为0.68mg/L和2.65mg/L. 将前者用碱性氧化铝层析柱分离得到一组抑藻活性更强的化感物质和一组能够促进蛋白核小球藻生长的化感物质: 前者对蛋白核小球藻的EC₅₀为0.50mg/L, 是目前报道的抑藻能力最强的化感物质; 后者在浓度为0.63mg/L时能显著促进蛋白核小球藻的生长. 芦苇化感物质可以用来控制淡水中有害藻类.     

鄱阳湖典型区铜锈环棱螺体内微塑料分布特征

微塑料能够被水生生物摄入并对其产生毒性效应.以5条汇入鄱阳湖河流的入湖口、鄱阳湖出湖口和南矶山自然保护区为研究区,采集优势底栖动物铜锈环棱螺样品,对其进行组织消解并分离其中的微塑料,利用显微镜和红外光谱鉴定微塑料,分析鄱阳湖典型区铜锈环棱螺体内微塑料分布特征.结果表明,鄱阳湖典型区铜锈环棱螺体内微塑料丰度为（0.52±0.15）～（2.48±0.90） n·g^-1,赣江入湖口铜锈环棱螺体内微塑料丰度高于其他入湖口,南矶山湿地自然保护区铜锈环棱螺体内微塑料丰度最小.研究区铜锈环棱螺体内微塑料以粒径小于1 mm的透明纤维为主.铜锈环棱螺肠道微塑料丰度高于肌肉组织.本研究表明人类活动是影响铜锈环棱螺体内微塑料丰度的重要因素,对底栖动物中微塑料的调查有助于人们全面了解微塑料污染的生态风险.     

南京玄武湖微囊藻水华种类组成的研究

2005-08～2006-10采集蓝藻水华样品, 通过形态学特征和ITS序列分子标记的方法对南京玄武湖水华的优势种类进行了鉴定. 结果表明,玄武湖水华主要由微囊藻构成, 通过形态特征鉴定主要种类为铜绿微囊藻(M. aeruginosa)、M. novacekii 和惠氏微囊藻(M. wesenbergii). 3种藻的生物量在水华中的相对比例分别为30%～45%、35%～40%和10%～15%. 采用分子标记的方法对２种优势种类进行了分子鉴定. PCR扩增ITS序列并进行测序, 通过基因序列比对和基于ITS序列的系统发生树分析, 进一步确定了优势种类为M. aeruginosa和M. novacekii; 通过检测产毒基因mcyB来确认2株优势微囊藻的产毒特性, PCR扩增结果均出现了大约为780 bp的特异性片段, 表明这2种藻均为产毒种. 对水华提取物的高效液相色谱(HPLC)测定表明, 玄武湖水华中微囊藻毒素的种类主要是MC-LR和MC-RR.     

Effects of drought climate on the photosynthesis of Aneurolepidium chinense community in the typical steppe region of Inner Mongolia

Under the dry weather conditions in the typical steppe region of Inner Mongolia, the diurnal change curve of photosynthetic rate of Aneurolepidium chinense community is a curve of "double peaks" with midday depression. The photosynthetic rate in the morning is height than in the afternoon, which is related to the water condition at that time. The decrease range of community photosynthetic rate at noon is closely correlated with the low air relative humidity and soil moisture, the photosynthetic rate decreases less under better water condition.The instantaneous photosynthetic rate and diurnal net photosynthesis declined in dry condition, but they rised after irrigation or nitrogen-fertilization. Thus irrigation and fertilization is a effective way to improve grasslands and to raise grassland productivity.     

太湖蓝藻水华期间水体和底泥中产毒微囊藻与非产毒微囊藻种群丰度研究

运用实时荧光定量PCR(Quantitative real-time PCR,QPCR)技术研究了太湖蓝藻水华期间不同湖区水体和底泥中产毒微囊藻与总微囊藻种群丰度.结果表明,湖区间产毒微囊藻种群和总微囊藻种群丰度明显不同:在水体中,竺山湾(N5)和梅梁湾(N2)产毒微囊藻和总微囊藻种群丰度高于贡湖湾(N4)和湖心(S4...     

Growth and nutrient accumulation of Phragmites australis in relation to water level variation and nutrient loadings in a shallow lake

Shallow lake eutrophication is a global environmental issue. This study investigated the effects of water level variation and nutrient loadings on the growth and nutrient accumulation of Phragmites australis (reed) by field samplings in Baiyangdian Lake, the largest shallow lake of northern China. The field samplings were conducted in two sites of different nutrient loadings during the whole growth period of reeds, and three types of zones with different water depths were chosen for each site, including the terrestrial zone with water level below the ground, the ecotone zone with the water level varying from belowground to aboveground, and the submerged zone with water level above the ground. The result showed that reed growth was more limited by water level variation than nutrient loadings. The average stem lengths and diameters in terrestrial zones were about 26.3%-27.5% and 7.2%-12.0% higher than those in submerged zones, respectively. Similarly, the terrestrial status increased the aboveground biomass of reeds by 36.6%-51.8% compared with the submerged status. Both the nutrient concentrations and storages in the aboveground reeds were mainly influenced by the nutrient loadings in surface water and sediment rather than the water level variation of the reed growth environment, and the nutrient storages reached their maxima in late August or early September. It was observed that the maximum nitrogen storage occurred in the terrestrial zone with higher nutrient loadings, with the value of 74.5 g/m 2 . This study suggested that water level variation and nutrient loadings should be considered when using reeds to control and remediate eutrophication of shallow lakes.     

扰动强度对太湖水华微囊藻群体生长和叶绿素荧光的影响

风浪扰动在湖泊和水库中频繁发生,是影响湖泊生态系统的重要因素之一.为了解太湖风浪扰动对水华微囊藻群体生长的影响,并探究其影响机理,利用室内摇床试验,设置不同的扰动强度（0、50、100、200、400 r/min）来模拟太湖风浪扰动,扰动时间为24 h,并测定不同扰动强度下水华微囊藻群体生长和叶绿素荧光参数.结果表明,所有试验组中,100 r/min组的ρ（Chla）、微囊藻数量、F_v/F_m（潜在最大光合效率）、ETR_max（潜在最大光合速率）、I_k（半饱和光强）和α（光能利用效率）增加最快,试验结束时分别为扰动前的3.29、10.75、1.20、2.30、2.21和1.21倍;并且扰动结束后,100 r/min组中3~10细胞群体细胞数量占比由25.80%降至20.70%,显著低于对照组（P < 0.05）,而>10细胞群体细胞数量占比由0增至25.55%,显著高于对照组（P < 0.05）.方差分析表明,试验第7~11天,100 r/min组的ρ（Chla）、水华微囊藻数量、F_v/F_m、ETR_max和α显著高于对照组（P < 0.05）;第1~5天,400 r/min组的ρ（Chla）、ETR_max和I_k显著低于对照组（P < 0.05）.研究显示,适宜的扰动强度（100 r/min）促进水华微囊藻群体生长和光合活性,过高的扰动强度（400 r/min）则抑制水华微囊藻群体生长和光合活性.