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林冠结构是局域尺度木本植物功能性状beta多样性形成的重要驱动力 被引量:6
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作者 周昌艳 王彬 +3 位作者 邓云 乌俊杰 曹敏 林露湘 《生物多样性》 CAS CSCD 北大核心 2020年第12期1546-1557,共12页
功能性状beta多样性反映了群落间功能性状组成的差异,解析其形成机制是群落生态学研究的核心内容之一。本研究以云南西双版纳热带季节雨林20 ha动态监测样地为研究对象,测定木本植物11个重要的功能性状,采用多度加权的平均最近邻体性状... 功能性状beta多样性反映了群落间功能性状组成的差异,解析其形成机制是群落生态学研究的核心内容之一。本研究以云南西双版纳热带季节雨林20 ha动态监测样地为研究对象,测定木本植物11个重要的功能性状,采用多度加权的平均最近邻体性状距离度量不同取样尺度的功能性状beta多样性,基于距离矩阵的多元回归方法解析林冠结构差异、环境异质性、空间距离在功能性状beta多样性格局形成中的相对作用。结果表明,对于所有木本植物个体(DBH≥1 cm)而言,同时考虑林冠结构、环境和空间距离的模型为解释功能性状beta多样性格局的最优模型;在3个不同取样尺度上,林冠结构差异和环境距离都对功能性状beta多样性具有较大的解释力,且随着取样尺度的增大而上升,空间距离的作用基本可以忽略。本研究证实了林冠结构是局域尺度木本植物功能性状beta多样性格局形成的重要驱动力,这一发现更新了环境异质性和空间距离是驱动功能性状beta多样性格局形成的主要因素的传统认知,为将来研究功能性状beta多样性形成机制提供新的视角,并证实了取样尺度在解析木本植物功能性状beta多样性格局形成机制中的重要性。 展开更多
关键词 环境异质性 空间距离 热带季节雨林 森林动态监测样地 西双版纳
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Genetic diversity of Listeria monocytogenes isolates from farm products in Shanghai,China 被引量:1
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作者 Yujuan Suo Yang Qu +5 位作者 Yalong Bai Xiujuan zhou Ting Lin Jing Wang Wanyi Chen changyan zhou 《Food Quality and Safety》 SCIE CSCD 2022年第3期427-434,共8页
Farm products are considered important vehicles for the transmission of Listeria monocytogenes(L.monocytogenes).The typing of L.monocytogenes from farm products contributes to the surveillance and source tracing of th... Farm products are considered important vehicles for the transmission of Listeria monocytogenes(L.monocytogenes).The typing of L.monocytogenes from farm products contributes to the surveillance and source tracing of the pathogen.In this study,77 L.monocytogenes strains from seven farm product categories in Shanghai were analyzed by serological typing,multilocus sequence typing(MLST),pulsed-field gel electrophoresis(PFGE),and whole-genome nucleotide polymorphism(wgSNP).The results showed that the 77 isolates were classified into four serovars(1/2a,1/2c,1/2b,and 4b),and of these,1/2a(n=47)was the most prevalent.Seventeen sequence types(STs)were generated by MLST with two novel STs(ST1402 and ST1403),and 20 of 77 L.monocytogenes isolates had high genetic identity with previously documented outbreak isolates according to the minimum spanning tree from the MLST results.Moreover,34 PFGE patterns(PF1-PF34)were differentiated,and based on a similarity value higher than 80%by the unweighted pair group method dendrogram,the discriminatory index was relatively low(equal to 0.775).Furthermore,14 isolates were chosen and further analyzed by wgsNP based on the previous typing results,which demonstrated that wgSNP and MLST yielded mostly consistent typing results but higher resolution than PFGE.In conclusion,77 L.monocytogenes isolates from farm products collected in nine districts in Shanghai were highly genetically diverse,and 20 of these isolates had high relatedness with previously documented outbreak strains worldwide.The results indicate a possible cross-contamination risk of L.monocytogenes and a potential public health concern resulting from farm products during the supply chain in Shanghai,China. 展开更多
关键词 Listeria monocytogenes SEROTYPE multilocus sequence typing(MLST) pulsed field gel electrophoresis(PFGE) whole-genome single nucleotide polymorphism(wgSNP).
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