Background:Forested landscapes are valuable sources of ecosystem services especially in areas dedicated to intense agricultural activities.Distance from forest margin is known to influence the wild bee community in th...Background:Forested landscapes are valuable sources of ecosystem services especially in areas dedicated to intense agricultural activities.Distance from forest margin is known to influence the wild bee community in the landscape surrounding forested patches.Yet little is known regarding how bee communities distribute themselves in landscapes that exhibit different forest successional states.Methods:We examined how land use type and distance from the forest edge affect the abundance and richness of the wild bee community across four forest successional states.Bees were collected in sites representing four stages of forest succession and analyzed using generalized linear mixed models with negative binomial distributions.Results:Wild bee diversity is reduced in forested environments that maintain dense stands of trees and high canopy cover.Additionally,distance from the forest edge was an important factor determining wild bee distribution in successional stages adjacent to forest edges.Furthermore,we found that bees maintain high specificity for distinct successional states and distances.Conclusions:Our results demonstrate how different successional stages can harbor different bee species and highlight the ability of microhabitats to act as reservoirs of bee diversity in and around forest margins.Furthermore,we found that maximizing successional patchiness across forested landscapes increases the amount of available habitat that can support a diverse suite of bees with different nesting biologies and behaviors.展开更多
Forests,the largest terrestrial carbon sinks,play an important role in carbon sequestration and climate change mitigation.Although forest attributes and environmental factors have been shown to impact aboveground biom...Forests,the largest terrestrial carbon sinks,play an important role in carbon sequestration and climate change mitigation.Although forest attributes and environmental factors have been shown to impact aboveground biomass,their influence on biomass stocks in species-rich forests in southern China,a biodiversity hotspot,has rarely been investigated.In this study,we characterized the effects of environmental factors,forest structure,and species diversity on aboveground biomass stocks of 30 plots(1 ha each) in natural forests located within seven nature reserves distributed across subtropical and marginal tropical zones in Guangxi,China.Our results indicate that forest aboveground biomass stocks in this region are lower than those in mature tropical and subtropical forests in other regions.Furthermore,we found that aboveground biomass was positively correlated with stand age,mean annual precipitation,elevation,structural attributes and species richness,although not with species evenness.When we compared stands with the same basal area,we found that aboveground biomass stock was higher in communities with a higher coefficient of variation of diameter at breast height.These findings highlight the importance of maintaining forest structural diversity and species richness to promote aboveground biomass accumulation and reveal the potential impacts of precipitation changes resulting from climate warming on the ecosystem services of subtropical and northern tropical forests in China.Notably,many natural forests in southern China are not fully stocked.Therefore,their continued growth will increase their carbon storage over time.展开更多
基金USDA National Institute of Food and Agriculture Hatch Project 1004515Foundation for Food and Agriculture Research Pollinator Health fund 549038.
文摘Background:Forested landscapes are valuable sources of ecosystem services especially in areas dedicated to intense agricultural activities.Distance from forest margin is known to influence the wild bee community in the landscape surrounding forested patches.Yet little is known regarding how bee communities distribute themselves in landscapes that exhibit different forest successional states.Methods:We examined how land use type and distance from the forest edge affect the abundance and richness of the wild bee community across four forest successional states.Bees were collected in sites representing four stages of forest succession and analyzed using generalized linear mixed models with negative binomial distributions.Results:Wild bee diversity is reduced in forested environments that maintain dense stands of trees and high canopy cover.Additionally,distance from the forest edge was an important factor determining wild bee distribution in successional stages adjacent to forest edges.Furthermore,we found that bees maintain high specificity for distinct successional states and distances.Conclusions:Our results demonstrate how different successional stages can harbor different bee species and highlight the ability of microhabitats to act as reservoirs of bee diversity in and around forest margins.Furthermore,we found that maximizing successional patchiness across forested landscapes increases the amount of available habitat that can support a diverse suite of bees with different nesting biologies and behaviors.
基金supported by the Guangxi Key R&D Program (project No. AB16380254)a research project of Guangxi Forestry Department (Guilinkezi [2015] No.5)supported a grant for Bagui Senior Fellow (C33600992001)。
文摘Forests,the largest terrestrial carbon sinks,play an important role in carbon sequestration and climate change mitigation.Although forest attributes and environmental factors have been shown to impact aboveground biomass,their influence on biomass stocks in species-rich forests in southern China,a biodiversity hotspot,has rarely been investigated.In this study,we characterized the effects of environmental factors,forest structure,and species diversity on aboveground biomass stocks of 30 plots(1 ha each) in natural forests located within seven nature reserves distributed across subtropical and marginal tropical zones in Guangxi,China.Our results indicate that forest aboveground biomass stocks in this region are lower than those in mature tropical and subtropical forests in other regions.Furthermore,we found that aboveground biomass was positively correlated with stand age,mean annual precipitation,elevation,structural attributes and species richness,although not with species evenness.When we compared stands with the same basal area,we found that aboveground biomass stock was higher in communities with a higher coefficient of variation of diameter at breast height.These findings highlight the importance of maintaining forest structural diversity and species richness to promote aboveground biomass accumulation and reveal the potential impacts of precipitation changes resulting from climate warming on the ecosystem services of subtropical and northern tropical forests in China.Notably,many natural forests in southern China are not fully stocked.Therefore,their continued growth will increase their carbon storage over time.
