基于经过非均一性检验及订正前后1979-2003年中国东部地区130个气象台站的日平均、最高和最低温度常规观测资料,利用研究区域内气象台站常规观测资料和NCEP/NCAR(The NationalCenters for Atmospheric Prediction and the National Cent...基于经过非均一性检验及订正前后1979-2003年中国东部地区130个气象台站的日平均、最高和最低温度常规观测资料,利用研究区域内气象台站常规观测资料和NCEP/NCAR(The NationalCenters for Atmospheric Prediction and the National Center for Atmosphetic Research)再分析资料温度变化趋势的差值,本文定量考察了研究区域内城市化及土地利用类型改变对区域温度气候趋势的贡献.研究结果显示,经过订正后的台站观测数据具有一定的可信度,比订正前更具合理性.城市化及土地利用类型的改变造成了研究区域内城镇气象站点日平均、最高和最低温度的上升,其中日最低温度的上升程度大于日最高温度,从而导致了日较差温度的下降.进一步研究表明,从1980年代后期开始,城镇气象站点的日平均和最低温度明显上升.从不同季节来看,冬季是区域温度变化趋势最为明显的季节,但却是城市化及土地利用类型改变对区域温度气候趋势贡献最小的季节,对研究区域温度气候趋势贡献最大的季节为夏季.展开更多
Urban afforestation is an important strategy for promoting sustainable urban development.In cities where large new green spaces are not available,the planting of curbside trees is deemed to be an important afforestati...Urban afforestation is an important strategy for promoting sustainable urban development.In cities where large new green spaces are not available,the planting of curbside trees is deemed to be an important afforestation strategy.However,variations in the ecosystem services provided by street tree assemblages across socioeconomic gradients have been unexplored.We examined such variations in ecosystem services provided by street tree assemblages along an urban–suburban continuum.Our findings were as follows.(i)Not all ecosystem services showed increasing trends along the urban–suburban continuum.Some ecosystem services at the street tree assemblage level,such as air purification and rainfall interception were prominent in areas of high urbanization intensity.(ii)Diverse ecosystem service trends were found in relation to differential characteristics of street trees assemblages.Structural properties of street tree assemblages,such as tree density and age structure,are likely key factors influencing variations.(iii)Although street tree density could partially compensate for the loss of large old trees,the protection of such trees is important because of their close associations with key ecosystem services,such as total carbon storage.To maximize the value of street trees in promoting urban sustainable development,trade-offs among multiple ecosystem services should be integrated within the overall planning process and adjustments of planting regimes.展开更多
文摘基于经过非均一性检验及订正前后1979-2003年中国东部地区130个气象台站的日平均、最高和最低温度常规观测资料,利用研究区域内气象台站常规观测资料和NCEP/NCAR(The NationalCenters for Atmospheric Prediction and the National Center for Atmosphetic Research)再分析资料温度变化趋势的差值,本文定量考察了研究区域内城市化及土地利用类型改变对区域温度气候趋势的贡献.研究结果显示,经过订正后的台站观测数据具有一定的可信度,比订正前更具合理性.城市化及土地利用类型的改变造成了研究区域内城镇气象站点日平均、最高和最低温度的上升,其中日最低温度的上升程度大于日最高温度,从而导致了日较差温度的下降.进一步研究表明,从1980年代后期开始,城镇气象站点的日平均和最低温度明显上升.从不同季节来看,冬季是区域温度变化趋势最为明显的季节,但却是城市化及土地利用类型改变对区域温度气候趋势贡献最小的季节,对研究区域温度气候趋势贡献最大的季节为夏季.
基金Funding for this study was provided by the National Natural Sciences Foundation of China(32130068,32171665).
文摘Urban afforestation is an important strategy for promoting sustainable urban development.In cities where large new green spaces are not available,the planting of curbside trees is deemed to be an important afforestation strategy.However,variations in the ecosystem services provided by street tree assemblages across socioeconomic gradients have been unexplored.We examined such variations in ecosystem services provided by street tree assemblages along an urban–suburban continuum.Our findings were as follows.(i)Not all ecosystem services showed increasing trends along the urban–suburban continuum.Some ecosystem services at the street tree assemblage level,such as air purification and rainfall interception were prominent in areas of high urbanization intensity.(ii)Diverse ecosystem service trends were found in relation to differential characteristics of street trees assemblages.Structural properties of street tree assemblages,such as tree density and age structure,are likely key factors influencing variations.(iii)Although street tree density could partially compensate for the loss of large old trees,the protection of such trees is important because of their close associations with key ecosystem services,such as total carbon storage.To maximize the value of street trees in promoting urban sustainable development,trade-offs among multiple ecosystem services should be integrated within the overall planning process and adjustments of planting regimes.
