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Population structure of Araucaria angustifolia under distinct forest protection status:implications for management and conservation

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Journal of Forestry Research 2023年第5期34卷 1437-1446页

作者： Vinicius Costa Cysneiros Allan Libanio Pelissari Sylvio Pellico Netto Sebastiao do Amaral Machado Afonso Figueiredo Filho Departamento de Agricultura Biodiversidade e FlorestasUniversidade Federal de Santa Catarina-UFSCRodovia Ulysses GaboardiKm 03CuritibanosSC 89520-000Brazil Departamento de Ciencias Florestais Universidade Federal do Paraná-UFPRAv.Prof.Lothario Meissner632CuritibaPR 80210-170Brazil Departamento de Engenharia Florestal Universidade Estadual do Centro-Oeste-UNICENTROPR-153Km 7IratiPR 84500-000Brazil

Araucaria angustifolia is the dominant coniferous species in Brazil,a long-lived pioneer species and a supplier of valuable timber and non-timber products,which gives it key-species *** study examines how *** population structure affects the stand structure,and whether these relationships differ between protected and unprotected *** study was carried out on two protection status forests(national forest and urban forest)in a region of Atlantic mixed forest in ParanáState,southern *** coefficient and the Weibull shape parameter described the population structure and its effects on species diversity and biomass *** diameter distribution differed significantly between forests,with unbalanced structure in both,although regeneration was more abundant in the protected *** positively affected aboveground biomass whereas shape negatively affected it and species *** relationships differed between protected and unprotected *** effect of *** populations on stand structure was conditioned on protection ***-growth populations may have lower diversity and biomass stock even supporting large ***,old-growth forests,can lead to wood loss through mortality,senescence,and declining populations,representing the waste of a valuable timber *** findings provide useful knowledge for forest management,species conservation,and the carbon market.

关键词： key species Diameter distribution Weibull shape parameter Aboveground biomass

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Topology-based analysis of pelagic food web structure in the central and eastern tropical Pacific Ocean based on longline observer data

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Acta Oceanologica Sinica 2020年第6期39卷 1-9页

作者： Qinqin Lin Jiangfeng Zhu College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education Shanghai Ocean UniversityShanghai 201306China

The tropical Pacific Ocean supports many productive commercial ***,few studies of ecosystem structure in the tropical Pacific Ocean have been carried *** this study,we analyzed the food web structure in the central and eastern tropical Pacific Ocean based on trophic relationships of 35 pelagic species collected by Chinese tuna longline observers from June to November in *** indices(node degree,D;centrality indices,BC and CC;topological importance indices,TI^1,TI^3;keystone indices,K,K_t and K_b)and key-Player algorithms(KPP-1,KPP-2)were used to select key species and construct a simplified food web combined with body size *** Kendall rank correlation and hierarchical clustering analysis indicated that different topology indices resulted in consistent rankings of key *** key species were the same as those selected in other studies in the Pacific Ocean,such as Shortbill spearfish(Tetrapturus angustirostris),Swordfish(Xiphias gladius),Albacore tuna(Thunnus alalunga),cephalopods and *** food web would be separated into many unconnected parts(F=0.632,FD=0.795,R^D=0.957)after the removal of the five key species,indicating the key roles of these species in the food web structure and *** size was considered an influential indicator in constructing the simplified food *** study can improve our understanding of the food web structure in the tropical Pacific Ocean and provide scientific basis for further ecosystem dynamics studies.

关键词： topology food web structure tropical Pacific key species size structure

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