Regional development strategies that align with urban characteristics and the sci-entific allocation of construction land indicators can effectively guide the high-quality coordi-nated development of urban agglomerati...Regional development strategies that align with urban characteristics and the sci-entific allocation of construction land indicators can effectively guide the high-quality coordi-nated development of urban agglomerations.However,the issue of whether urbanization matches the development strategy has always lacked an in-depth response in geography.Moreover,along with the urbanization process,the land limitation for agricultural and eco-logical spaces becomes increasingly strict,and the availability of construction land indicators is increasingly constrained.The construction land allocation is thus critical for the distribution of regional resources and the development goals of urban agglomeration.Based on the prin-ciples of development geography and the core-periphery theory,this study comprehensively considered three subsystems of urbanization(population,economy,and land)and the spatial link intensity among cities within a certain region to analyze the impacts of"siphon"and"ra-diation"effects on regional development,and assessed whether China's two major regional urbanization strategies aligned the comprehensive development characteristics.Furthermore,the quantitative construction land allocation in Beijing-Tianjin-Hebei(BTH)and Yangtze River Delta(YRD)urban agglomerations was completed.The results showed that the urban com-prehensive level index(UCL)in core cities(Beijing and Tianjin)and peripheral cities differed significantly in BTH,demonstrating a clear core-periphery structure.Along with urbanization,the"siphon"effect in BTH was weakening.Beijing's urban primacy decreased and the growth rate of UCL decreased from 53.89%in the first five years to 18.37%in the last five years during the study period(2020-2019).In contrast,the"radiation"effect in YRD was more ob-vious,exhibiting a development pattern driven by multiple growth poles.Temporally,the BTH indicated a coordinated development trend,while the integration level of YRD continued to strengthen.Compared to the top-down construction land allocated by the government,the results of quantitative allocation in this study reduced volatility.This study confirms the scientific basis of the coordinated development for BTH and the integrated regional development strategy for YRD from the perspective of development geography.It also provides a practical reference fortheconstructionland allocation.展开更多
China is the world's largest carbon dioxide(CO_(2)) emitter and a major trading country. Both anthropogenic and natural factors play a critical role in its carbon budget. However,previous studies mostly focus on e...China is the world's largest carbon dioxide(CO_(2)) emitter and a major trading country. Both anthropogenic and natural factors play a critical role in its carbon budget. However,previous studies mostly focus on evaluating anthropogenic emissions or the natural carbon cycle separately, and few included trade-related(import and export) CO_(2) emissions and its contribution on global warming. Using the Carbon Tracker CT2019 assimilation dataset and China trade emissions from the Global Carbon Project, we found that the change trend of global CO_(2) flux had obvious spatial heterogeneity, which is mainly affected by anthropogenic CO_(2) flux. From 2000 to 2018, carbon emissions from fossil fuels in the world and in China all showed an obvious increasing trend, but the magnitude of the increase tended to slow down.In 2018, the radiative forcing(RF) caused by China's import and export trade was-0.0038 W m^(-2), and the RF caused by natural carbon budget was-0.0027 W m^(-2), offsetting 1.54% and 1.13% of the RF caused by fossil fuels that year, respectively. From 2000 to 2018, the contribution of China's carbon emission from fossil fuels to global RF was 11.32%. Considering China's import and export trade, the contribution of anthropogenic CO_(2) emission to global RF decreased to 9.50%. Furthermore, taking into account the offset of carbon sink from China's terrestrial ecosystems, the net contribution of China to global RF decreased to 7.63%. This study demonstrates that China's terrestrial ecosystem and import and export trade are all mitigating China's impact on global anthropogenic warming, and also confirms that during the research process on climate change, comprehensively considering the carbon budget from anthropogenic and natural carbon budgets is necessary to systematically understand the impacts of regional or national carbon budgets on global warming.展开更多
中国作为全球最主要的CO_(2)排放国之一和主要贸易国,人为和自然因素均对中国碳收支和全球辐射强迫具有重要作用。但现有研究多单独关注人为或自然因素的作用,尤其缺乏考虑贸易转移的碳排放及其对全球增温影响的研究。本文使用CarbonTra...中国作为全球最主要的CO_(2)排放国之一和主要贸易国,人为和自然因素均对中国碳收支和全球辐射强迫具有重要作用。但现有研究多单独关注人为或自然因素的作用,尤其缺乏考虑贸易转移的碳排放及其对全球增温影响的研究。本文使用CarbonTracker CT2019B同化数据集和中国贸易排放量数据开展研究。结果表明,全球CO_(2)通量的变化趋势具有明显的空间异质性,这主要是受人为CO_(2)通量的影响。2000—2018年全球及中国化石燃料的碳排放呈现明显的增加趋势,但增加的幅度趋于变缓。2018年中国进出口贸易产生的辐射强迫为-0.0038 W m^(-2),自然碳收支产生的辐射强迫为-0.0027 W m^(-2),分别抵消了当年化石燃料产生辐射强迫的1.54%和1.13%。中国在2000—2018年间化石燃料排放CO_(2)对全球辐射强迫的贡献为11.32%,考虑到中国进出口贸易后,中国人为CO_(2)对全球辐射强迫的贡献为9.50%;进一步考虑到中国陆地生态系统,中国净CO_(2)对全球辐射强迫的贡献下降至7.63%。本文表明了中国陆地生态系统及进出口贸易均在缓解中国对全球增温的作用,也证实了在气候变化研究中把人为和自然源碳收支综合考虑才能系统认知区域或国别碳收支对全球增温的影响。展开更多
针对中国草原、荒漠草原生态系统承载的温室气体量在区域大尺度上无法有效量化的问题,本研究通过生态系统温室气体值(green-house gas value,GHGV)模型,利用国内1990–2015年共6期的草原、荒漠草原的土地利用数据,开展草原时空变化分析...针对中国草原、荒漠草原生态系统承载的温室气体量在区域大尺度上无法有效量化的问题,本研究通过生态系统温室气体值(green-house gas value,GHGV)模型,利用国内1990–2015年共6期的草原、荒漠草原的土地利用数据,开展草原时空变化分析,结合全球和中国本地化后的两套模拟参数分别模拟分析中国草原、荒漠草原近25年来对3类主要温室气体(CO2、CH4、N2O)的封存潜力。结果显示,研究时段内,草原、荒漠草原的面积呈下降趋势,对温室气体的封存潜力有所减弱,封存的温室气体减少了1.93 Pg·CO2-eq–1。通过对比参数本地化和模型自带参数的模拟结果发现,本地化参数后草原、荒漠草原生态系统的温室气体模拟值均大于使用全球参数的模拟值。本研究同时发现,从草原面积到草地的碳储量,当前研究均面临量值差异的挑战,亟待开展更多深入的研究。展开更多
基金National Natural Science Foundation of China,No.42071415Xinyang Academy of Ecological Research Open Foundation,No.2023XYMS01Central Plains Youth Top Talent Project。
文摘Regional development strategies that align with urban characteristics and the sci-entific allocation of construction land indicators can effectively guide the high-quality coordi-nated development of urban agglomerations.However,the issue of whether urbanization matches the development strategy has always lacked an in-depth response in geography.Moreover,along with the urbanization process,the land limitation for agricultural and eco-logical spaces becomes increasingly strict,and the availability of construction land indicators is increasingly constrained.The construction land allocation is thus critical for the distribution of regional resources and the development goals of urban agglomeration.Based on the prin-ciples of development geography and the core-periphery theory,this study comprehensively considered three subsystems of urbanization(population,economy,and land)and the spatial link intensity among cities within a certain region to analyze the impacts of"siphon"and"ra-diation"effects on regional development,and assessed whether China's two major regional urbanization strategies aligned the comprehensive development characteristics.Furthermore,the quantitative construction land allocation in Beijing-Tianjin-Hebei(BTH)and Yangtze River Delta(YRD)urban agglomerations was completed.The results showed that the urban com-prehensive level index(UCL)in core cities(Beijing and Tianjin)and peripheral cities differed significantly in BTH,demonstrating a clear core-periphery structure.Along with urbanization,the"siphon"effect in BTH was weakening.Beijing's urban primacy decreased and the growth rate of UCL decreased from 53.89%in the first five years to 18.37%in the last five years during the study period(2020-2019).In contrast,the"radiation"effect in YRD was more ob-vious,exhibiting a development pattern driven by multiple growth poles.Temporally,the BTH indicated a coordinated development trend,while the integration level of YRD continued to strengthen.Compared to the top-down construction land allocated by the government,the results of quantitative allocation in this study reduced volatility.This study confirms the scientific basis of the coordinated development for BTH and the integrated regional development strategy for YRD from the perspective of development geography.It also provides a practical reference fortheconstructionland allocation.
基金National Natural Science Foundation of China,No.42071415National Key Research and Development Program of China,No.2021YFE0106700Outstanding Youth Foundation of Henan Natural Science Foundation,No.202300410049。
文摘China is the world's largest carbon dioxide(CO_(2)) emitter and a major trading country. Both anthropogenic and natural factors play a critical role in its carbon budget. However,previous studies mostly focus on evaluating anthropogenic emissions or the natural carbon cycle separately, and few included trade-related(import and export) CO_(2) emissions and its contribution on global warming. Using the Carbon Tracker CT2019 assimilation dataset and China trade emissions from the Global Carbon Project, we found that the change trend of global CO_(2) flux had obvious spatial heterogeneity, which is mainly affected by anthropogenic CO_(2) flux. From 2000 to 2018, carbon emissions from fossil fuels in the world and in China all showed an obvious increasing trend, but the magnitude of the increase tended to slow down.In 2018, the radiative forcing(RF) caused by China's import and export trade was-0.0038 W m^(-2), and the RF caused by natural carbon budget was-0.0027 W m^(-2), offsetting 1.54% and 1.13% of the RF caused by fossil fuels that year, respectively. From 2000 to 2018, the contribution of China's carbon emission from fossil fuels to global RF was 11.32%. Considering China's import and export trade, the contribution of anthropogenic CO_(2) emission to global RF decreased to 9.50%. Furthermore, taking into account the offset of carbon sink from China's terrestrial ecosystems, the net contribution of China to global RF decreased to 7.63%. This study demonstrates that China's terrestrial ecosystem and import and export trade are all mitigating China's impact on global anthropogenic warming, and also confirms that during the research process on climate change, comprehensively considering the carbon budget from anthropogenic and natural carbon budgets is necessary to systematically understand the impacts of regional or national carbon budgets on global warming.
文摘中国作为全球最主要的CO_(2)排放国之一和主要贸易国,人为和自然因素均对中国碳收支和全球辐射强迫具有重要作用。但现有研究多单独关注人为或自然因素的作用,尤其缺乏考虑贸易转移的碳排放及其对全球增温影响的研究。本文使用CarbonTracker CT2019B同化数据集和中国贸易排放量数据开展研究。结果表明,全球CO_(2)通量的变化趋势具有明显的空间异质性,这主要是受人为CO_(2)通量的影响。2000—2018年全球及中国化石燃料的碳排放呈现明显的增加趋势,但增加的幅度趋于变缓。2018年中国进出口贸易产生的辐射强迫为-0.0038 W m^(-2),自然碳收支产生的辐射强迫为-0.0027 W m^(-2),分别抵消了当年化石燃料产生辐射强迫的1.54%和1.13%。中国在2000—2018年间化石燃料排放CO_(2)对全球辐射强迫的贡献为11.32%,考虑到中国进出口贸易后,中国人为CO_(2)对全球辐射强迫的贡献为9.50%;进一步考虑到中国陆地生态系统,中国净CO_(2)对全球辐射强迫的贡献下降至7.63%。本文表明了中国陆地生态系统及进出口贸易均在缓解中国对全球增温的作用,也证实了在气候变化研究中把人为和自然源碳收支综合考虑才能系统认知区域或国别碳收支对全球增温的影响。
文摘针对中国草原、荒漠草原生态系统承载的温室气体量在区域大尺度上无法有效量化的问题,本研究通过生态系统温室气体值(green-house gas value,GHGV)模型,利用国内1990–2015年共6期的草原、荒漠草原的土地利用数据,开展草原时空变化分析,结合全球和中国本地化后的两套模拟参数分别模拟分析中国草原、荒漠草原近25年来对3类主要温室气体(CO2、CH4、N2O)的封存潜力。结果显示,研究时段内,草原、荒漠草原的面积呈下降趋势,对温室气体的封存潜力有所减弱,封存的温室气体减少了1.93 Pg·CO2-eq–1。通过对比参数本地化和模型自带参数的模拟结果发现,本地化参数后草原、荒漠草原生态系统的温室气体模拟值均大于使用全球参数的模拟值。本研究同时发现,从草原面积到草地的碳储量,当前研究均面临量值差异的挑战,亟待开展更多深入的研究。
