Flora Cryptogamica Sinica is a phytotaxonomic corpus specializing in recording endemic cryptogamic species of unvascular plants in China. It was compiled and published by its Editorial Committee affiliated to the CAS ...Flora Cryptogamica Sinica is a phytotaxonomic corpus specializing in recording endemic cryptogamic species of unvascular plants in China. It was compiled and published by its Editorial Committee affiliated to the CAS headquarters. Divided by specific contents, it consists of five parts, namely, Marine Flora Algae of China, Fresh water Flora Algae of China, Fungal Flora of China,展开更多
Various types of vegetative cover,predominantly woodlands,shrublands,and grasslands,provide a range of habitats for urban organisms and are the main contributors to urban ecosystem services.The goal of this study was ...Various types of vegetative cover,predominantly woodlands,shrublands,and grasslands,provide a range of habitats for urban organisms and are the main contributors to urban ecosystem services.The goal of this study was to assess the potential of different vegetation types in maintaining and enhancing bryophyte diversity in urban areas.Bryophytes,small non-vascular plants,in woodlands,shrublands,and grasslands in Hefei city(eastern China)were investigated,and their species richness,abundance,community composition and relationships with habitat characteristics were analysed.The results show that urban woodlands had the highest species richness and abundance of bryophytes and a distinct community composition compared with the other vegetation types.Relative light intensity had a positive effect on species richness in urban woodlands,whereas litter cover had a negative effect on abundance.Shrub,grass and litter covers,and relative air humidity were the main factors driving the differences in bryophyte species composition between woodlands and other vegetation types.Therefore,owing to their high potential to maintain bryophyte diversity,woodlands should receive increased attention during the construction of urban green spaces.In addition,promoting structural heterogeneity and increasing light availability would be beneficial to bryophyte species diversity.展开更多
Introduction:Sagebrush ecosystems in western North America are being replaced by the invasion of annual grasses,particularly Bromus tectorum.In experimental situations and in localized landscapes,prior studies have do...Introduction:Sagebrush ecosystems in western North America are being replaced by the invasion of annual grasses,particularly Bromus tectorum.In experimental situations and in localized landscapes,prior studies have documented that biological soil crusts(biocrusts)can reduce annual grass presence and that biocrusts are highly vulnerable to physical disturbance.Practical conservation would benefit from verification of these patterms at scales that matter to local economies.This study tests if these patterns appear at a regional scale.Methods:A previously collected data set of vegetation provided sampling of biocrust cover across the Great Basin within the state of Nevada,USA Data were analyzed with non-par ametric methods including odds ratios and generalized aditive models(GAM).Results:From a data set of 608 vegetation plots within the Great Basin ecoregion,proportion of plots with high annual grass cover differed between sites with high versus low biocrust cover(p=0.0015).A negative relationship between annual grass cover and biocrust cover was confirmed with GAM(p=0.009).For a model of biocrust cover,cattle disturbance was found to be an explanatory variable(p<0.00001).Conclusions:The patterns do appear at the regional scale,with high levels of cattle activity corresponding to low cover of biocrusts,and low cover of biocrusts corresponding to high cover of annual grasses.展开更多
文摘Flora Cryptogamica Sinica is a phytotaxonomic corpus specializing in recording endemic cryptogamic species of unvascular plants in China. It was compiled and published by its Editorial Committee affiliated to the CAS headquarters. Divided by specific contents, it consists of five parts, namely, Marine Flora Algae of China, Fresh water Flora Algae of China, Fungal Flora of China,
基金funded by the Scientific Research Project of Anhui Higher Education Institutions(2022AH050915)the Anhui Agricultural University Natural Science Foundation Youth Project(K2137004)the Anhui Agricultural University Introducing and Stabilizing Talent Project(rc372103).
文摘Various types of vegetative cover,predominantly woodlands,shrublands,and grasslands,provide a range of habitats for urban organisms and are the main contributors to urban ecosystem services.The goal of this study was to assess the potential of different vegetation types in maintaining and enhancing bryophyte diversity in urban areas.Bryophytes,small non-vascular plants,in woodlands,shrublands,and grasslands in Hefei city(eastern China)were investigated,and their species richness,abundance,community composition and relationships with habitat characteristics were analysed.The results show that urban woodlands had the highest species richness and abundance of bryophytes and a distinct community composition compared with the other vegetation types.Relative light intensity had a positive effect on species richness in urban woodlands,whereas litter cover had a negative effect on abundance.Shrub,grass and litter covers,and relative air humidity were the main factors driving the differences in bryophyte species composition between woodlands and other vegetation types.Therefore,owing to their high potential to maintain bryophyte diversity,woodlands should receive increased attention during the construction of urban green spaces.In addition,promoting structural heterogeneity and increasing light availability would be beneficial to bryophyte species diversity.
文摘Introduction:Sagebrush ecosystems in western North America are being replaced by the invasion of annual grasses,particularly Bromus tectorum.In experimental situations and in localized landscapes,prior studies have documented that biological soil crusts(biocrusts)can reduce annual grass presence and that biocrusts are highly vulnerable to physical disturbance.Practical conservation would benefit from verification of these patterms at scales that matter to local economies.This study tests if these patterns appear at a regional scale.Methods:A previously collected data set of vegetation provided sampling of biocrust cover across the Great Basin within the state of Nevada,USA Data were analyzed with non-par ametric methods including odds ratios and generalized aditive models(GAM).Results:From a data set of 608 vegetation plots within the Great Basin ecoregion,proportion of plots with high annual grass cover differed between sites with high versus low biocrust cover(p=0.0015).A negative relationship between annual grass cover and biocrust cover was confirmed with GAM(p=0.009).For a model of biocrust cover,cattle disturbance was found to be an explanatory variable(p<0.00001).Conclusions:The patterns do appear at the regional scale,with high levels of cattle activity corresponding to low cover of biocrusts,and low cover of biocrusts corresponding to high cover of annual grasses.
