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Woody species composition,structure and environmental determinants in a moist evergreen Afromontane forest,southern Ethiopia

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Journal of Forestry Research 2020年第4期31卷 1173-1186页

作者： Befkadu Mewded Mesele Negash Tesfaye Awas Forest and Range Land Plants Diversity Directorate Ethiopian Biodiversity InstituteP.O.Box:30726Addis AbabaEthiopia Wondo Genet College of Forestry and Natural Resources Hawassa UniversityP.O.Box:123ShashemeneEthiopia

Ethiopian moist evergreen Afromontane forests are vital for the conservation of plant diversity,including genetic pools of Coffea arabica ***,these forests are continuously shrinking and need empirical scientific studies for their effective conservation and sustainable *** study was,therefore,conducted to assess woody species composition,diversity,endemicity,structure,plant communities,and environmental determinants in Sirso moist evergreen Afromontane forest of southern *** variables such as altitude,slope,aspect,disturbance levels,and geographical location were recorded for each main *** structure and importance value index(IVI),diversity,vegetation classification,and correlation with environmental factors were analyzed.A total of 74 woody species representing 70 genera and 34 families were *** species were *** glutinosa *** *** and Prunus africana(Hook.f.)*** species categorized as vulnerable according to the IUCN red list *** highest number of species was recorded for the Rubiaceae family(8),followed by Euphorbiaceae(6),and Asteraceae(6).Five plant communities were identified:Maesa lanceolata-Dombeya torrida,Galiniera saxifraga-Cyathea manniana,Vepris dainellii-Triumfetta tomentosa,Dracaena fragrans-Rytigynia neglecta,and Arundinaria *** distribution of these communities depends on altitude,slope,and disturbance *** guineense(Wild.)DC.,Schefflera abyssinica(*** ***.)Harms,and Galiniera saxifraga(Hochst.)Bridson were species with the highest IVI,while ***,Cordia africana Lam.,Hagenia abyssinica(Bruce)***,Bridelia micrantha(Hochst.)Baill.,and *** had the *** structure of woody species showed an inverted J-shape,a J-shape,a bell-shape,and an irregular shaped *** latter three population structure revealed signs of disturbances,and were negatively correlated with altitude and *** study sh

关键词： Endemicity Plant community population recruitment Regeneration status

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Mesozooplankton distribution and diversity from the Bering Sea shelf to the Chukchi Sea

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Advances in Polar Science 2023年第2期34卷 91-104页

作者： XU Zhiqiang WANG Chaofeng CHAO Yuan WAN Aiyong ZHANG Guangtao Jiaozhou Bay Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China CAS Key Laboratory of Marine Ecology and Environmental Science Institute of OceanologyChinese Academy of SciencesQingdao 266071China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China

In recent decades,environmental changes in the Arctic have aroused widespread concern around the *** better understand ecology issues such as ecosystem dynamics,the Arctic and the subarctic regions were integrated as the“pan-Arctic”*** this study,mesozooplankton were sampled from the Bering Sea shelf to the northern Chukchi Sea during the 10th Chinese National Arctic Research Expedition in *** on the species composition and abundance,three geographical communities were identified:the Bering Sea shelf community(BSS),the Bering Strait transitional community(BST),and the Chukchi Sea shelf community(CSS).The BSS was characterized by Bering Sea oceanic species such as Eucalanus bungii;the BST was mainly composed of the pan-Arctic distributed Calanus glacialis,meroplankton of benthos,and neritic species such as Centropages abdominalis;copepods,especially the copepodite of ***,were predominant in the CSS *** BSS community structure was strongly affected by the inflow of Bering Shelf Water,while those of BST and CSS were determined by the recruitment of local *** zooplankton community structure is influenced by both advection and environmental changes such as warming and a prolonged productivity ***,it was difficult to distinguish the changes induced by climate change from the effects of the Bering Sea *** key to solving this problem is the accumulation of comparable data,which requires continuous monitoring of key species such as *** and Calanus hyperboreus.

关键词： Mesozooplankton Bering Sea shelf Bering Strait Chukchi Sea geographical distribution community structure population recruitment climate change

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Responses of a perennial rhizomatous grass Leymus chinensis to mowing in a saline-alkali meadow of northeast China: from tiller, rhizome and bud bank

Responses of a perennial rhizomatous grass Leymus chinensis ...

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2018中国草学会年会

作者：李海燕杨允菲东北师范大学草地科学研究所植被生态科学教育部重点实验室

Despite the vegetative reproduction is responsible to population regeneration and ecosystem productivity, it has received far less attention than deserved in perennial herbaceous communities. The tiller, rhizome, and bud bank under different mowing intensities were investigated in two consecutive years on Leymus chinensis meadow of northeast China. The responses of tiller, rhizome, and bud bank of L. chinensis to site, year and month were significantly different. The long-term mowing significantly increased the density of tillers, tiller buds, rhizome and buds, and significantly decreased total tiller mass, mass per tiller, rhizome in length and mass, and mass per rhizome length. The long-term consecutive mowing has seriously depressed both regeneration and production in L. chinensis.

关键词： Perennial grass Mowing Vegetative reproductive Bud bank population recruitment

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