桂林岩溶石山密花树群落主要物种的种间关联及群落稳定性

研究群落内主要物种的种间关联及群落稳定性,有助于正确地认识种间关系和物种共存机制,进而能为植被的恢复与重建以及生物多样性保护等提供理论依据。然而桂林岩溶石山密花树群落主要物种的种间关联及群落稳定性仍不明确。基于群落调查数据,采用方差比率法(VR)、χ²检验、Pearson相关检验、Spearman秩相关检验和M.Godron稳定性等方法,对该群落主要物种的种间关联及群落稳定性进行研究。结果表明:(1)该群落乔木层、灌木层和草本层主要物种间的总体关联性均呈显著负关联;(2)χ²检验结果显示,各层次绝大部分种对均无显著关联,种间关联较松散,各物种间呈独立分布格局;(3) Pearson相关检验和Spearman秩相关检验发现,各层次绝大部分种对均呈不显著相关,种间相关性较弱;(4) M.Godron稳定性结果表明,整个群落及其各垂直层次的稳定性测定结果均远离20/80,皆处于不稳定状态。研究显示桂林岩溶石山密花树群落种间关联较松散,各物种呈相对独立分布格局,群落处于不稳定的演替早期阶段。因此,在岩溶地区植被恢复与重建过程中,应将资源利用方式、生物学特征和生态学习性相近,对生境要求相似的优势乡土物种搭配在一起。此外,可采取适当的抚育措施,调节种间关系,提高群落稳定性。     

青藏高原东南部森林群落生态位特征与物种多样性的影响因素

青藏高原东南部的东喜马拉雅地区和横断山区是全球生物多样性热点区,也是青藏高原重要的生态安全屏障区,但对该区域森林群落的生态位特征以及多样性相关研究较少。收集和整理了分布于青藏高原东南部的乔木植物及其科属特征,并分析主要优势物种的生态位特征以及森林群落多样性的影响因素。采用"Levins"方法计算优势物种的生态位宽度和生态位重叠值;随后,使用方差比率法、 χ²检验、Association coefficient联结系数和Ochiai指数等方法分析了种间联结性;最后,使用方差分解方法计算了每个环境因素对植物多样性的解释率。研究结果表明:(1)位于东喜马拉雅地区和横断山区森林群落共有植物42科71属119种,物种组成主要以松科(17种)、杜鹃花科(10种)、桦木科(9种)、无患子科(8种)和樟科(6种)为主;(2)该地区所有种植物生态位重叠值较低(平均值为0.027),并且生态位重叠值为0的种对数最多,说明森林群落整体竞争较小,处于一个相对稳定的状态;(3)生态位宽度值由高到低的物种依次为:冷杉、杜鹃、云南铁杉、川西云杉、落叶松、黄背栎、高山栎、花楸、石栎和云南松,这10种植物在森林群落占据优势地位;(4)种间关联结果显示方差比率大于1,说明森林群落中物种间存在较强的正关联,群落内各个物种占据的不同生态位,合理地利用各种资源;(5)年均温和坡向被认为是影响该地区森林群落物种多样性最关键的两个环境因子;(6)森林群落在年均温为7-11℃的地区和半阳坡的地形中,群落植物多样性最高。     

神农架南坡小叶青冈+曼青冈常绿阔叶林主要木本植物生态位与种间联结

为揭示神农架南坡代表性常绿阔叶林主要木本植物的种间生态联系及群落演替趋势,以小叶青冈+曼青冈群系20个主要木本植物的190组种对为研究对象,通过生态位测定并区分生态位特化种和生态位泛化种以及种间联结性检验,分析该群落主要物种生态位与种间联结特征。主要结果:(1)该常绿阔叶林群落物种丰富,群落组成复杂,小叶青冈(Cyclobalanopsis myrsinifolia)的重要值(11.13%)和生态位宽度(58.3)均最大,占绝对优势,生态位宽度排序和重要值排序不一致,分布频度对生态位宽度影响较大。(2)将20种主要木本植物划分为生态位特化种(6种)、生态位泛化种(3种)、中性类群(11种),生态位分化程度较高,资源利用差异以及生境适应性是影响生态位分化的主要因素。(3)生态位宽度大的物种其生态位重叠和相似度较高,生态位重叠指数总体略低,大部分物种对环境或资源需求相似,但相似度不高,种间竞争较弱,种间关系比较稳定。(4)主要木本植物总体正联结显著(P ＜ 0.05),χ²检验、联结系数AC、Spearman秩相关检验结果均显示种间正联结作用占优势,但大多数种对联结不显著,物种趋于独立分布。(5)通过聚类分析,将20种主要木本植物划分三大生态种组:建群种组,共生种组和边缘种组。研究表明,神农架南坡小叶青冈+曼青冈常绿阔叶林目前正处于相对稳定的演替中后期阶段,群落发育较成熟,生态位分化、生境选择以及资源需求互补或互利是影响该群落物种共存的主要原因。研究阐明了神农架南坡代表性常绿阔叶林主要物种之间实际相互作用以及群落特征,为深入理解群落物种共存原因以及群落演替规律提供依据。     

1992-2015年鼎湖山季风常绿阔叶林群落种间关联动态

季风常绿阔叶林是我国南亚热带地区的地带性植被,有研究表明过去23年其群落结构和物种组成发生了很大变化,但对群落种间关系的动态变化还缺乏了解。该研究利用鼎湖山季风常绿阔叶林1 hm²监测样地7次群落调查数据,采用方差比率和Spearman秩相关分析的方法,对1992-2015年鼎湖山季风常绿阔叶林群落种间关系的长期动态变化进行了分析。结果表明：从1992年到2015年,群落方差比率都显著（P < 0.05）大于1,但方差比率总体呈显著下降趋势（R²=0.93,P < 0.001）,显著正联结种对数显著减少,显著负联结种对数显著增多,群落正联结关系减弱;群落各垂直层次内和垂直层次之间显著正联结种对数呈显著下降趋势（P < 0.001）,种间的正关联关系减弱;香楠（Aidia canthioides）、红枝蒲桃（Syzygium rehderianum）、光叶红豆（Ormosia glaberrima）等树种能够和大多数物种长时间稳定共存,在季风常绿阔叶林群落结构中可能具有重要地位和作用,可以作为华南地区生态恢复、林业种植的搭配树种。总的来说,1992-2015年,鼎湖山季风常绿阔叶林群落种间正联结关系减弱,负联结关系增强,导致群落种间关联愈加松散,群落稳定性下降。     

桂林岩溶石山青冈群落灌木层主要物种生态位与种间联结

基于样方调查,采用生态位测定、方差比率法、χ²检验、Pearson相关检验和Spearman秩相关检验等方法对桂林岩溶石山青冈群落灌木层主要物种的生态位与种间联结进行研究。结果表明:(1)青冈的生态位宽度最大,占绝对竞争优势;重要值较大(小)的物种,其生态位宽度一般较大(小),但两者顺序并非完全一致。(2)主要物种间的生态位相似性较小,各物种对资源利用的相似程度不高;一般生态位宽度较大的物种,其生态位相似性也越大。(3)生态位宽度较大的物种间产生生态位重叠的概率较大,但生态位重叠程度并不一定大;生态位宽度与生态位重叠有一定的联系,但并不存在绝对的正相关关系;生态位相似性和生态位重叠程度的变化趋势基本吻合。(4)灌木层主要物种的总体联结性表现为显著正联结,表明该群落处于相对稳定的演替阶段。(5)χ²检验、Pearson相关检验和Spearman秩相关检验结果的显著率均较低,种间联结性不强。(6)物种间的Pearson相关系数、Spearman秩相关系数与相应的生态位相似性和生态位重叠程度之间均呈显著正相关,表现为种间正(负)联结越强,生态位相似...     

武陵山大木山自然保护区红豆杉群落优势乔木种群生态位和种间联结

应用Pearson相关系数和Spearman秩相关系数检验。对武陵山大木山自然保护区红豆杉群落内13个优势乔木种群的种间关联（或相关）性进行研究,并对13个优势乔木种群生态位宽度、生态位重叠进行分析。结果表明,红豆杉种群对资源的利用能力较强,生态位宽度值较大：红豆杉与其他物种生态特性差异较大,生态位重叠值较低;群落内各种群间关系的相对独立性较弱,红豆杉种群与其他物种大多呈正相关关系。生态位宽度值大的物种,与其他物种的生态位重叠值一般较大;生态位重叠值较大的物种对,其种间联结一般也较显著。     

广东翁源青云山自然保护区森林群落优势树种的生态位特征

为探讨广东翁源青云山自然保护区植被的生境适应性和竞争机制,对青云山自然保护区森林群落优势树种的生态位特征进行了分析。结果表明,群落优势种的重要值之和为49.01,其中杉木（Cunninghamia lanceolata）的重要值最大,毛竹（Phyllostachys edulis）的变异系数最大。优势种的Levins和Shannon生态位宽度较为一致,罗浮柿（Diospyros morrisiana）、栲（Castanopsis fargesii）、木荷（Schima superba）、鼠刺（Itea chinensis）和罗浮锥（C.faberi）的生态位宽度较大,而毛竹、杉木、黧蒴锥（C.fissa）和华润楠（Machilus chinensis）的生态位宽度相对较窄。所有物种对间的生态位重叠度和生态位相似性较小,表明共存物种的种间竞争不激烈,因而群落处于相对稳定的状态。生态位宽度与重要值的关系不显著,而与重要值变异系数呈显著的负相关关系,表明重要值变异系数是影响生态位宽度的重要因素。这为青云山自然保护区森林资源的保护和管理提供重要的科学依据。     

洮河自然保护区大峪沟林区紫果云杉群落木本植物种群生态位特征

基于群落调查数据,以样地代表多种资源的综合状态,物种重要值作为生态位的计测指标,利用Levins和Shannon生态位宽度,Schoener生态位相似和Pianka生态位重叠对洮河自然保护区大峪沟林区的紫果云杉群落木本植物种群生态位进行定量研究。结果表明：紫果云杉群落乔木层共有树种8种,隶属于4科6属,紫果云杉占绝对优势,岷江冷杉为次优势种;灌木层共有植物50种,隶属于16科25属,忍冬科的蓝靛果、葱皮忍冬和唐古特忍冬等以及蔷薇科的峨眉蔷薇和银露梅等构成了灌木层的主体,紫果云杉幼苗优势不明显,但生态位宽度最大。本研究表明,生态位宽度受物种生态特性及其分布和生境共同影响,重要值大的物种生态位宽度一般较大,生态位宽度大的物种之间生态位相似性和重叠性一般较大,并与其它物种重叠的概率高、重叠程度大,生态位宽度小的物种集中出现时也会出现较大的生态位重叠,同科或同属的物种间常有较大生态位相似和重叠。生态位宽度反映着种群的扩散潜力,生态位相似反映着群落的稳定性,生态位重叠反映着物种间存在或潜在的竞争程度。紫果云杉在乔、灌木层均有最大的生态位宽度,生态适应性最强,群落结构稳定,具有进一步扩散的可能。     

赤水桫椤群落乔木层优势物种生态位与种间联结性研究

赤水桫椤国家级自然保护区是以桫椤为保护对象的自然保护区,该研究在对保护区桫椤(Alsophila spinulosa)群落进行野外调查的基础上,采用生态位宽度、生态位重叠和基于2×2联列表的方差比率法(VR)、卡方(χ2)检验、联结系数(AC)等方法,分析了群落物种间的相互关系。结果表明:(1)研究区内毛竹(Phyllostachys heterocycla)的生态位宽度最大,其次是桫椤和毛桐(Mallotus barbatus)。(2)马尾松(Pinus massoniana)与油桐(Vernicia fordii)、杉木(Cunninghamia lanceolata),芭蕉(Musa basjoo)与陀螺果(Melliodendron xylocarpum)的生态位重叠值较大。(3)14个乔木层优势物种间总体关联性呈不显著负相关关系;卡方检验表明桫椤与其他种群之间联结性均不显著,群落中90.10%种对的联结性均未达到显著水平,只有极少数种对存在显著关联;大部分种对的AC、Ochai指数(OI)、Jaccard指数(JI)值都不高,种对间相关性较弱,独立性相对较强,且群落负联结的种对多于正联结,处于动态演替不稳定阶段。(4)物种之间的联结性与相应的生态位重叠结合分析表明,两者呈正相关关系,表现为种间正联结越强,生态位重叠越大,负联结越强,生态位重叠越小。     

福建琅岐岛台湾相思群落灌木层主要物种生态位与种间联结

为探究福建琅岐岛台湾相思(Acacia confusa)群落种间关系和群落演替动态,对其灌木层主要物种的生态位和种间联结特征进行了分析。结果表明,重要值和生态位宽度最大的物种为雀梅藤(Sageretia thea),其竞争优势、环境适应能力最强;灌木层主要物种的生态位相似性和生态位重叠较小,表明种间对环境资源的利用和要求存在较大差异,表现为较稳定的种间关系;灌木层主要物种的总体联结性为显著正联结,种对间正负联结比为1.72,检验显著率为7.35%,表明种对间联结程度较弱,独立性相对较强,物种竞争不激烈,群落处于相对后期且稳定的演替阶段;红锥(Castanopsis hystrix)与许多物种间存在垂直方向上对生境要求的互补性,生态位重叠较小,种间呈正联结关系;外来物种马缨丹(Lantanacamara)与福建胡颓子(Elaeagnus oldhamii)存在一定的竞争,与灌木层其他主要植物之间的资源竞争不激烈,其对该群落的影响相对较小。琅岐岛台湾相思群落目前已发展为地带性的顶级群落,物种竞争不激烈,种间关系较稳定;而海岛上恶劣的环境和外来物种的扩散会导致植物生境资源短缺,迫使物种聚集在...     

Relationship between genotoxicity,mutagenicity, and fish community structure in a contaminated stream

Genotoxic responses (chromosomal damage, DNA strandbreakage) of redbreast sunfish (Lepomis auritis)populations exposed to industrial effluent andmutagenicity of the associated sediments weredetermined in order to compare them to changes incommunity structure. Data were collected from areference stream and East Fork Poplar Creek (EFPC), afirst-order stream which originates on the grounds ofthe Department of Energy Y-12 Plant at Oak Ridge, TN. This stream is contaminated with mercury, PCBs, andnumerous other compounds. Previous studies have shownthat sediment contaminant concentrations, as well asphysiological biomarker responses of the local fishpopulations, are highest at the headwaters of EFPC anddecrease with increasing distance from the DOEfacility as contaminant loading decreases. Chromosomal damage was measured by flow cytometry – asreflected by variation in cellular DNA content – andstrand breakage was determined by agarose gelelectrophoresis using blood as the source of DNA. Mutagenicity was determined by theSalmonella/microsome assay using organic solventextracts of sediment surface samples. Community levelresponses included community diversity and percentpollution-tolerant species. Biomarker responses andmutagenicity were found to be highest at theheadwaters of EFPC, and tended to decrease withincreasing distance from the effluent. In general,biomarker responses appeared to be correlated withmutagenicity of the sediment, and both of theserelated to fish community disturbance and level ofstream contamination. Because responses at severallevels of biological organization show similarpatterns of downstream effects, this suggests thatthere may be a causal relationship betweencontamination and biological effects.     

黄顶菊对不同入侵地植物群落及土壤微生物群落的影响

为明确不同入侵地植物群落和土壤生态对黄顶菊入侵的反馈机制,选取天津静海(JH)、河北沧州(CZ)、河北衡水(HS)及河南安阳(AY)4个黄顶菊入侵典型区域,研究黄顶菊对不同入侵地植物群落多样性、土壤理化及土壤微生物群落结构的影响,并进一步揭示植物群落、土壤养分和土壤微生物之间的相关关系。结果表明,黄顶菊入侵显著降低了JH、CZ和HS的植物群落多样性指数(P0.05),改变了四个地区的土壤理化性质,显著升高了不同入侵地真菌PLFA的含量、总PLFA的含量、真菌/细菌和革兰氏阴性菌/革兰氏阳性菌(P0.05),降低了土壤微生物的Margalef丰富度指数(P0.05),但均存在地区间差异;RDA和相关分析的结果表明,硝态氮、全氮的含量对植物群落的影响较大,而铵态氮的含量对土壤微生物群落结构的影响较大,除丰富度指数外,植物群落与土壤微生物群落的多样性指数之间存在显著的负相关关系(P0.05)。总之,黄顶菊改变了入侵地植物群落多样性,并且对入侵地土壤理化性质和土壤微生物群落结构产生了显著影响,且存在地区差异。本研究将为更好的理解外来植物的入侵机制及制定相应的防控策略提供理论依据。     

Food,growth, habitat,and community interactions of young-of-the-year burbot,Lota lota L., in a Precambrian Shield lake

The burbot, Lota lota, is a widely distributed gadid of the northern circumpolar regions of North America and Eurasia. Despite its near ubiquity over much of its range, relatively little is known about its biology during the first year of life.Burbot sac-fry of 3 mm total length, hatched under the ice in early May in Shebandowan Lake. Their first foods following atrophy of the yolk-sac were copepods and cladocerans which they captured pelagically. At first the fry swam in small schools, high in the water column of the near-shore littoral, and fed during the daytime. Upon reaching 30 mm in total length, the burbot fingerlings became solitary and benthic, and fed primarily at night, almost exclusively on the amphipod, Hyalella azteca. Amphipods constituted about 75 per cent by number of all the food consumed by burbot fingerlings in their first year of life. Growth was rapid from May to the end of July, tapered off during August to October, and effectively stopped by November at freeze-up. The principal habitat of burbot fingerlings during the benthic stages of their life was the near-shore littoral, in depths ranging from 0.5 m to 4.0 m. There, they were sheltered by boulder shoals, sunken trees or other debris, or beds of quillworts (Isoetes sp.). The principal ichthyofauna that cohabited with the burbot included the sculpin (Cottus cognatus), the smallmouth bass (Micropterus dolomieui), two etheostomatines (Etheostoma nigrum) and (E. exile) and the yellow perch (Perca flavescens). Burbot fingerlings were subjected to low levels of predation from the nocturnal foraging of walleyes (Stizostedion vitreum).     

呼和浩特市大青山白桦根际土壤细菌群落结构研究

采用高通量测序技术对天然次生林生态系统演替过程中先锋树种白桦的根际土壤细菌多样性及群落结构进行了分析。研究结果表明:白桦根际土壤细菌隶属于28门、90纲、126目、213科、286属,在3个采样地中排名前8的优势细菌门的相对丰度均大于1%,分别为变形菌门(Proteobacteria)、酸杆菌门(Acidobacteria)、放线菌门(Actinobacteria)、芽单胞菌门(Gemmatimonadetes)、绿弯菌门(Chloroflexi)、硝化螺旋菌门(Nitrospirae)、疣微菌门(Verrucomicrobia)和拟杆菌门(Bacteroidetes)。各样地中前3个门的相对丰度之和均在60%以上。对白桦根际土壤细菌的α多样性指数、门水平的聚类热图以及PCoA聚类结果的分析表明,3个采样地中,小井沟(B2)和哈达门森林公园(C2)白桦根际土壤细菌的物种组成更为接近,与井儿梁(A2)的物种组成有一定差异;且小井沟和哈达门森林公园的物种多样性及丰度(ACE指数)显著高于井儿梁,表明细菌对不同环境的适应能力有明显差异。对细菌群落结构与土壤理化性质的RDA分析及相关性分析表明,环境因子对白桦根际土壤细菌的影响顺序为:全氮TN酸碱度pH含水量WC速效钾AK硝态氮NN铵态氮AN有机质OM有效磷EP,其中,TN、pH和WC是白桦根际土壤优势细菌的主要影响因子。研究结果为深入认识森林生态系统中根际土壤细菌的群落结构和影响因子提供了理论依据。     

桂林岩溶石山青冈群落植物功能性状的种间和种内变异研究

研究植物功能性状的种间和种内变异,有助于揭示植物对环境的适应策略及其群落构建机制研究。以桂林岩溶石山青冈群落主要木本植物为研究对象,选取叶干物质含量（LDMC）、叶厚度（LT）、比叶面积（SLA）和木材密度（WD）4个功能性状,采用混合线性模型结合方差分解方法对其在种内和种间尺度的变异程度和相对贡献进行分析,同时运用零模型方法探讨驱动岩溶石山青冈群落构建的潜在机制。结果表明：（1） LDMC,LT,SLA和WD这4个性状在种内和种间水平上均存在不同程度的变异幅度,种间变异大于种内变异,但种内变异亦不容忽略。（2）零模型检验表明,将种内变异纳入考虑的环境过滤检测得到改善,基于个体性状值的尺度考虑群落构建机制研究是必要的。（3）对于桂林岩溶石山青冈群落,环境过滤作用确实是群落构建的重要驱动机制,与相似性限制作用和随机作用共同塑造了以青冈为优势物种的群落构建。     

桥山栎林群落结构特征与物种多样性相关关系分析

为了解森林群落结构特征与物种多样性之间的相关关系,以黄土高原桥山林区典型麻栎纯林、麻栎阔叶混交林和麻栎油松混交林为研究对象,调查分析了群落结构特征,计算物种重要值及物种多样性,并进行了冗余分析,结果表明:(1)麻栎油松混交林主要以乔木层胸径、树高、枝下高等最高;麻栎阔叶混交林以灌木层盖度、地径、冠幅、高度等最高;麻栎纯林以草本地径、草本盖度及草本冠幅最高。(2) 3种类型林分乔木层重要值最高的均为麻栎(Quercus acutissima),灌木层为狼牙刺(Sophora viciifolia)、南蛇藤(Celastrus orbiculatus)、胡枝子(Lespedeza bicolor),草本层为苔草(Carex tristachya)。(3)麻栎油松混交林乔、灌层物种多样性较高,麻栎阔叶混交林以草本层物种多样性最高。(4)不同类型麻栎林群落结构特征与物种多样性关系有差异。松栎混交林中,对物种多样性影响最大的为乔木胸径、新稍长及灌木高度;麻栎阔叶混交林对物种多样性影响最大的为灌木层高度及冠幅;麻栎纯林中,对物种多样性影响最大的为乔木胸径。(5)麻栎油松混交林、麻栎阔叶混交林的胸径、树高、物种多样较麻栎纯林高,具有较高木材生产能力和生态防护功能,是未来森林经营培育的方向。     

Bacterial community changes in TCE biodegradation detected in microcosm experiments

Laboratory microcosm experiments were set up to model biodegradation of trichloroethylene (TCE). Groundwater samples from two contaminated sites were taken, one of them with low (70 mg L⁻¹), the other with high sulfate (685 mg L⁻¹) concentration. In order to assess the biodegradative potential of natural microbiota, supplementary substrates (whey or molasses) were added to the bottles. At day 54, 98, 155, and 318, chemical and bacteriological parameters (i.e., Dehalococcoides test) were investigated. Terminal restriction fragment length polymorphism (T-RFLP) based diversity assessments were carried out to observe the bacterial community changes. Whey and molasses enhanced degradation at different rates. In the case of samples with high sulfate content and amended with whey, no ethylene, ethane, or methane was generated. Both ethylene and methane production was detected in samples of low sulfate content with added whey. The results of Dehalococcoides tests were positive for all control and amended samples. Based on T-RFLP analysis, the bacterial communities of high sulfate concentration groundwater microcosms amended with molasses or whey were very similar, while the communities of groundwater samples with low sulfate concentration were different when supplemented with whey or molasses. The rRNA and rDNA based investigations suggest that the proportions of the active microbes and the microbes present in the microcosms differ.     

Ectomycorrhizas associated with a relict population of Dryas octopetala in the Burren, western Ireland II. Composition, structure and temporal variation in the ectomycorrhizal community

The composition, structure and temporal variation of ectomycorrhizal (EM) communities associated with mountain avens (Dryas octopetala) in grass heaths of the Burren, western Ireland were assessed by using soil core sampling in two permanent plots and 30 other sites (196 cores in total). Of the 34 different EM types observed, 11 were common and constituted over 80% of the EM biomass. Four EM types, Craterellus lutescens, Tomentella sp., Dryadirhiza fulgens and Cenococcum geophilum were the most abundant as measured by EM length and frequency of occurrence in cores. The species profile and relative abundances were very similar in cores from the permanent plots and different sites in the Burren, indicating that they were all representative of the same EM community. The below-ground EM community in both plots was compared with production of basidiomes, and the latter was found to be an unreliable indicator of EM community structure. Temporal variation in the EM community was assessed by repeated core sampling of the two permanent plots over a 14-month period (between March 1998 and May 1999). No statistically significant shifts in EM abundance were found between sampling dates, probably as a consequence of the large variation in EM abundance between core samples over the sampling period. No significant relationship was found between rainfall, soil moisture or soil temperature and fluctuations in EM abundance. Patterns of total EM abundance and fluctuations in EM diversity were strongly correlated between the two permanent plots over the sampling period. Temporal fluctuations in the dominant EM type, Craterellus lutescens, were similar in both plots with respect to mycorrhizal length, biomass and relative abundance, and the patterns between both plots were positively correlated. EM diversity was negatively correlated with biomass of ectomycorrhizas of Craterellus lutescens in both plots, but it was significant only in plot 1.     

植物群落和土壤理化性质对碧塔海湿地土壤细菌群落的影响

土壤微生物是湿地生态系统中土壤-植物系统生源要素迁移转化的引擎.探究湿地生态系统地上植物群落、土壤理化性质和空间结构与土壤细菌间的相互关系是维护湿地生态系统健康和稳定的关键.本研究运用双向指示种分析法(TWINSPAN)对碧塔海湿地采集的35个样方中的植物群落进行分类,并采用高通量测序技术对样方的表层土壤细菌进行测序,...