检索结果-南通市图书馆

Factors determining the occupancy of nest-boxes by Great Tits(Parus major)in eucalypt plantations

在线全文

学校读者我要写书评

暂无评论

引用

Avian Research 2023年第2期14卷 200-205页

作者： Ricardo S.Ceia Pedro B.Lopes Luís Pda Silva Centre for Functional Ecology–Science for People&the Planet Department of Life SciencesUniversity of Coimbra3000-456CoimbraPortugal CIBIO Centro de Investigaçao em Biodiversidade e Recursos GeneticosInBIO Laboratorio AssociadoCampus de Vair aoUniversidade do Porto4485-661VairaoPortugal BIOPOLIS Program in Genomics Biodiversity and Land PlanningCIBIOCampus de Vai~ao4485-661VairaoPortugal

Providing nest-boxes as surrogate tree cavities can be of great importance to increase the breeding populations of cavity-nesting birds in managed ***,the exact placement of nest-boxes should be taken into consideration to enhance their occupancy according to species-specific *** this study,we investigated which factors can better predict nest-box occupancy by the Great Tit(Parus major)in eucalypt *** used generalised linear mixed-effects models to analyse the influence of topography,nest-box positioning,vegetation cover and landscape variables on three-year occupancy records from 80 newly provided ***-random patterns of nest-box occupancy were found with respect to all categories except *** suggest that Great Tits prefer to occupy high-placed nest-boxes,close to areas that can provide them with supplementary resources either within or in the vicinity of the stand(i.e.,trees other than eucalypts,riparian vegetation,and large patches of adjacent habitats).Overall,this study provides important recommendations for nest-box placement and spatial distribution in managed forests and enhances the potential of nest-box interventions as a biodiversity offset and management tool.

关键词： eucalyptus globulus Managed forest Nest-site attributes Secondary cavity-nester Species-specific preferences Tit

Response of soil respiration to a severe drought in Chinese eucalyptus plantations

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Forestry Research 2017年第4期28卷 841-847页

作者： Shaojun Wang Hong Wang Department of Environmental Science and Engineering Southwest Forestry University Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the Environment Nanjing Forestry University

Extreme droughts can adversely affect the dynamics of soil respiration in tree plantations. We used a severe drought in southwestern China as a case study to estimate the effects of drought on temporal variations in soil respiration in a plantation of eucalyptus globulus. We documented a clear seasonal pattern in soil respiration with the highest values (100.9 mg C-CO2 m(-2) h(-1)) recorded in June and the lowest values (28.7 mg C-CO2 m(-2) h(-1)) in January. The variation in soil respiration was closely associated with the dynamics of soil water driven by the drought. Soil respiration was nearly twice as great in the wet seasons as in the dry seasons. Soil water content accounted for 83-91% of variation in soil respiration, while a combined soil water and soil temperature model explained 90-99% of the variation in soil respiration. Soil water had pronounced effects on soil respiration at the moisture threshold of 6-10%. Soil water was strongly related to changes in soil parameters (i.e., bulk density, pH, soil organic carbon, and available nitrogen). These strongly influenced seasonal variation in soil respiration. We found that soil respiration was strongly suppressed by severe drought. Drought resulted in a shortage of soil water which reduced formation of soil organic carbon, impacted soil acid-base properties and soil texture, and affected soil nutrient availability.

关键词： Drought eucalyptus globulus Global change Soil respiration

Status of and threats to the Black-winged Lovebird(Agapornis taranta) in Entoto Natural Park and Bole Sub-City,Addis Ababa,Ethiopia

在线全文

学校读者我要写书评

暂无评论

引用

Chinese Birds 2011年第4期02卷 174-182页

作者： Wondimagegnehu TEKALIGN Afework BEKELE Department of Biology Wolaita Sodo UniversityP.O.Box 138Wolaita SodoEthiopia Department of Biology Addis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia

A study of the population status of and threats to the Black-winged Lovebird(Agapornis taranta) was carried out from September 2008 to February 2009 in Entoto Natural Park(ENP) and in Bole SubCity,Addis Ababa,Ethiopia.A point transect count technique was employed to examine the status of the *** average total of 58 birds was recorded of which 46 were counted in Bole Sub-City and 12 in Entoto Natural Park *** maximum number recorded during our census was 57 in the dry season and 15 in the wet season in Bole Sub-City and Entoto Natural Park,*** ratio of adult males to adult females in Entoto Natural Park was 1:0.71 and 1:0.60,and 1:0.76 and 1:0.78 in Bole Sub-City during both wet and dry seasons,*** seasonal variation and difference in sex ratios between males and females was not significant(p > 0.05) at either of the study *** threat for the Blackwinged Lovebird or other birds in Entoto Natural Park is due to the fragmentation of natural habitats,thus decreasing food sources,owing to the domination of eucalyptus(eucalyptus globulus) trees in the *** by livestock,intensive farming practices and deforestation by the local community have contributed greatly to the degradation of the land resulting in erosion,thus devastating the habitat of the Natural *** vegetation cover of Entoto Natural Park and urban gardens should be managed effectively for the survival of the avian fauna of the area.

关键词： abundance Agapornis taranta eucalyptus globulus