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regional difference and influencing factors of the green development level in the urban agglomeration in the middle reaches of the Yangtze River

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Science China Earth Sciences 2022年第8期65卷 1449-1462页

作者： Lei ZOU Huiyuan LIU Feiyu WANG Ting CHEN Yi DONG Key Laboratory of Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

The urban agglomeration in the middle reaches of the Yangtze River(UAMRYR)is a key area to promote the central region rise and the green development of the Yangtze River Economic *** this paper,an evaluation index system was comprehensively constructed for the green development level of the UAMRYR from five aspects:resource utilization,green environment,green economy,green life,and support *** weight-TOPSIS method and multivariate statistical method,including spatial autocorrelation analysis and geographic detectors,were used to analyze the regional differences and influencing factors of the green development level of the UAMRYR from 2008 to *** results showed that:(1)the overall green development level of the UAMRYR showed a fluctuating upward trend from 2008 to 2018,among which the provincial capital cities such as Wuhan,Changsha,and Nanchang,as well as the cities covered by the Poyang Lake urban agglomeration had relatively higher green development levels.(2)The green development level of the 31 cities in the UAMRYR showed insignificant spatial heterogeneity within the study *** with other areas,the green development levels varied greatly among the regions of the Wuhan metropolitan area,which was a typical high-low aggregation type.(3)Green economy,green life,and support mechanisms were the highly influential aspects of the green development of the UAMRYR,and the main influencing factors were the total value added of secondary and tertiary industries,urbanization rate,and fixed asset *** explanatory power of the interaction of influencing factors on the green development of the UAMRYR was greater than that of a single *** study is intended to provide a reference for the green transformation development and the coordinated development of the“resources-environment-economy”in the UAMRYR.

关键词： Green development regional difference Impact factor Entropy weight-TOPSIS Geographic detector UAMRYR

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regional difference and dynamic evolution of development quality of power industry in China

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Chinese Journal of Population,Resources and Environment 2023年第1期21卷 1-12页

作者： Sha Yu Yongjian Pu Lefeng Shi Hao Yu Yixiang Huang School of Economics and Business Administration Chongqing UniversityChongqing 400044China National Center for Applied Mathematics in Chongqing Chongqing Normal UniversityChongqing 401331China College of Economics and Management Northwest A&F UniversityYangling 712100China

To achieve the goals of carbon peaking and carbon neutrality and maintain high-quality economic growth,China is currently striving to improve the quality of development of its power *** this regard,revealing the regional differences and evolutionary trends in the development quality of China’power sector has a high value to inspire the next improvement direction toward how to integrate regional power recourses to an overall optimization *** by this purpose,this paper uses the entropy method to evaluate the com‐prehensive and subsystem indices of the development quality of the power industry,and reveals their re‐gional differences and evolutionary trends with the help of the Dagum Gini coefficient and Kernel density es‐timation *** findings show that:There are obvious regional differences in the development quality of China’s power industry,and the differences are steadily declining in all regions except the *** differences are mainly derived from inter-regional differences,with the largest inter-regional differences in the East-Northeast ***-regional differences show a distribution pattern of East>West>North‐east>Center.

关键词： Development quality of power industry regional difference The Dagum Gini Dynamic evolution Kernel density

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regional differences of China′s Urban Expansion from Late 20th to Early 21st Century Based on Remote Sensing Information

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Chinese Geographical Science 2012年第1期22卷 1-14页

作者： LIU Jiyuan ZHANG Qian HU Yunfeng Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Department of Urban Planning and Environment KTH-Royal Institute of Technology Stockholm 10044 Sweden

This study investigated the regional differences of China′s urban land expansion from the late 1980s to the year of 2008, based on the spatio-temporal analysis of CLCD (China′s land cover/land use database) datasets which were mainly produced from remote sensing imagery data. A newly defined urbanization level index (UI), based on urban land area, is proposed to describe Chinese urban expansion process at 1 kilometer, provincial, regional, and na-tional scales, together with the absolute urban expansion index (UEa) and the relative urbanization expansion index (UEr). The results indicate that the percentages of total land area occupied by urban in the late 1980s, 1995, 2000, 2005, and 2008 were approximately 0.25%, 0.32%, 0.33%, 0.43% and 0.52% of China′s total land area, respectively. Between the late 1980s and 2008, the total urban expansion in the mainland of China was 2.645 × 104 km2, resulting in an annual urban expansion area of about 1322.7 km2/yr, with the UEr of 111.9%. This study also finds that there has been an obvious spatial gradient of urbanization ratio running from the east coast to the west inland, and the urbanization gaps among different regions have persisted over the past two decades. The study also reveals obvious temporal varia-tions of the urbanization rates. There was very little urban growth during the period of 1995-2000 due to the governmental policy factors.

关键词： regional difference spatial pattern temporal variation urbanization China

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regional differences in gully network connectivity based on graph theory:a case study on the Loess Plateau,China

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Journal of Mountain Science 2023年第4期20卷 1035-1050页

作者： CHENG Jian-hua LUO Lan-hua LI Fa-yuan LIU Lu-lu CUI Ling-zhou School of Geography Nanjing Normal UniversityNanjing210023China Key Laboratory of Virtual Geographic Environment Ministry of EducationNanjing Normal UniversityNanjing210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing Normal UniversityNanjing210023China School of Geography and Ocean Science Nanjing UniversityNanjing210023China College of Life and Environmental Science Wenzhou UniversityWenzhou325035China

Material exchange frequently occurs in gullies,and thus the relationship between a gullynetwork structure and sediment transport potential has attracted considerable ***,previous researches ignored the difficulty of material transport from sources to sinks,and did not quantify the connectivity of a network *** this study,we used a graph model structure to model gully networks of six typical sample areas in the Loess Plateau of China and quantified gully network connectivity using four indexes:average node strength,accessibility from sources to sinks,potential flow,and network structural connectivity *** show that:(1)Reflected by different quantitative indexes,the trends of gully network connectivity in different regions are *** north to south,the connectivity of a sample area first increases and then decreases.(2)The more mature gullies have stronger network *** resistance is conducive to material transport in the gullies.(3)The node connectivity index of the gully network shows a significant aggregation distribution in space,and node connectivity on the main channel is often stronger than that on the branch *** results not only deepen the understanding of the process and mechanism of loess gully geomorphic development and evolution but also provide a reference for geomorphic studies.

关键词： Graph theory Gully network Loess Plateau Connectivity regional difference

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regional differences of water conservation in Beijing’s forest ecosystem

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Journal of Forestry Research 2011年第2期22卷 295-300页

作者： ZHANG Biao XIE Gao-di YAN Yu-ping YANG Yan-gang Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Science Beijing 100101 China

The water conservation capacities of main forests in Beijing,China were estimated through the quantitative *** methods developed in published papers on forest hydrology were *** forests in Huairou,Yanqing,Miyun,Mentougou and Fangshan districts are the main contributors to water conservation（the cumulative ratio reaches 65%）,and the forests in Tongzhou,Chaoyang,Shunyi and Daxing districts have the highest water conservation capacity（3000 m3/ha）.Altitude and slope are the key factors to affect the water conservation *** forests located in Plain Area,Hilly Area,Low Mountain,and Middle Mountain contributes 27%,28%,24% and 21% of the conserved water,*** water conservation capacity of forests in Plain Area（2 948 m3/ha）,is superior to the forests in other *** the forests situated on Flat Slope,Moderate Slope and Gentle Slope constitute the largest proportion（nearly 93%） of water conservation,while the forests on Flat Slope has the highest water conservation capacity（2 797 m3/ha）,and the forest on Steep slope has the lowest water conservation capacity（948 m3/ha）.

关键词： forest ecosystem regional difference water conservation Beijing

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regional differences and Characteristics of Soil Organic Carbon Density Between Dry Land and Paddy Field in China

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Agricultural Sciences in China 2007年第8期6卷 981-987页

作者： XU Quan RUI Wen-yi BIAN Xin-min ZHANG Wei-jian Institute of Applied Ecology Nanjing Agricultural University Nanjing 210095 P.R.China

Study on the regional characteristics of soil organic carbon （SOC） density in farmland will not only contribute greatly to the technique of soil productivity enhancement, but also give evidences of technique selection and policy making for carbon sequestration in soils. Based on the second national soil survey of China, the situation of SOC density in the plow layer of farmland was analyzed under different land use patterns. Results showed that SOC density in the plow layer was about 3.15 kg m^-2 in average ranging from 0.81 to 12.68 kg m^-2. The highest density was found in the southeastern region with an average of 3.63 kg ma, while the lowest occurring in the northwestern region with an average of 3.00 kg m^-2. The variation coefficient of SOC density in the plow layer of farmland was 57%, which was 35% lower than that of non-farmland soils. Compared to SOC density in the dry land, SOC density in paddy soils was 13% higher with a lower variation coefficient between different regions. In addition, the relationships between the climatic factors （annual average temperature and precipitation） and SOC density were lower in farmland than those in non-farmland soils, as well as lower in paddy soils than those in dry land of farmland. These results suggest that anthropogenic disturbances have great impacts on SOC density in farmland soils, especially in paddy soils, indicating that Chinese rice cropping may contribute greatly to the SOC stability and sequestration in paddy field.

关键词： land use pattern organic carbon density carbon sequestration regional difference global change

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regional differences and threshold characters of the impact of energy use efficiency on energy scarcity in China

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Chinese Journal of Population,Resources and Environment 2021年第3期19卷 265-273页

作者： Min Li Kaisheng Long College of Public Administration Nanjing Agricultural UniversityNanjing210095China

The improvement of the technical efficiency of energy use has been widely seen as an important way to alleviate energy ***,the energy rebound effect demonstrates the vulnerability and unsustainability of alleviating energy scarcity relying on *** the background of the consistent development of energy factor market,it is of great importance to explore the paths and differences of energy source allocation constrained by technology and cost to promote the sustainable use of *** study analyzed the regional differences and threshold characteristics in the impact of the technical and cost efficiency of energy use on energy scarcity using the instrumental variable-two-stage least square method,based on the panel data of Chinese provinces from 2003 to *** results showed that:①Technology and price were the critical forces of the technical and cost efficiency of energy *** changed the degree of use of surplus production factors by affecting the complementary and replacement demand relationship between energy and non-energy ***,the impact of energy use efficiency on energy scarcity showed regional and time features due to the different technology capabilities and different levels of market development in different regions and different time.②The alleviation of energy scarcity at the national level relied on the improvement of energy cost *** the regional level,the alleviation of energy scarcity in central China came from the improvement of the technical efficiency of energy ***,the alleviation of energy scarcity in the eastern and western regions was due to the improvement of energy cost efficiency.③Constrained by the economic development,openness,science and technology input and the industrial development structure,the impact of the technical and cost efficiency of energy use on energy scarcity demonstrated a nonlinear *** structural mutation occurred after passing a specific‘inflection point’

关键词： Eenergy use technical efficiency Energy cost efficiency Energy scarcity regional difference Threshold regression

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regional differenceS OF TEMPORAL-SPATIAL CHARACTERISTICS OF AIR-SEA INTERACTIONS IN TROPICAL OCEANS

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Acta meteorologica Sinica 2001年第4期15卷 407-419页

作者：王盘兴何金海郭品文马丽萍 Department of Atmospheric Sciences Nanjing Institute of MeteorologyNanjing 210044

The singular value decomposition (SVD) of air-sea interaction in the tropical western,central, and eastern Pacific,and the tropical Atlantic and Indian Oceans has been conducted by using the NCEP/NCAR 40-year reanalysis 1000 hPa monthly wind field and COADS monthly sea surface temperature (SST).Comparisons of the results suggest that these areas can be divided into three types from the viewpoint of air-sea interaction:tropical central-eastern Pacific belongs to monistic type,in which ENSO is the sole important process;tropical western Pacific and Indian Oceans belong to dualistic type,in which in addition to *** should be an another important process;tropical Atlantic Ocean belongs to pluralistic type,in which the process is complicated and the ENSO cycle is not evident.

关键词： tropical ocean air-sea interaction regional difference

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Study on Comprehensive Efficiency Evaluation of Rural Power Grid under Rural Revitalization Strategy Considering regional differences

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Energy Engineering 2023年第10期120卷 2211-2231页

作者： Huiru Zhao Manyu Yao Zhenqi Bai Yue Zhang Zhihua Ding Zhenda Hu School of Economics and Management North China Electric Power UniversityBeijing102206China Integrated Institute for Grid Development State Grid Energy Research Institute Co.Ltd.Beijing102209China Development Department State Grid Fujian Electric Power Co.Ltd.Fuzhou350003China EnergyDevelopment Research Center Economic and Technical Research Institute of State Grid Fujian Electric Power Co.Ltd.Fuzhou350013China

As an essential infrastructure,the rural power grid is vital in promoting agricultural and rural carbon sequestration and improving rural energy *** is necessary to carry out in-depth research on its comprehensive *** on the requirements of“double carbon”and rural revitalization strategy for the rural Power Grid,this paper focuses on the modernization and low-carbon transformation of the rural Power *** constructs an input-output index system for the investment efficiency of the rural Power Grid in China under the new *** uses the primary data of the rural Power Grid of 30 prefecture-level cities in China from 2019 to 2021 to evaluate the investment efficiency of the rural Power Grid in China through a three-stage DEA *** empirical results show that:considering the regional differences,the comprehensive efficiency of the rural Power Grid in backward areas is significantly improved;that is,the three-stage DEA method can more objectively evaluate the comprehensive efficiency of the rural Power *** the context of the continued promotion of the rural revitalization strategy,to improve the comprehensive efficiency of the rural Power Grid,it is necessary to improve the technical level of the rural Power Grid further and appropriately expand the scale of investment in the rural Power Grid.

关键词： regional difference rural revitalization rural power grid three-stage DEA efficiency of investment

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regional differences of border geo-cities in China and the surrounding countries

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Journal of Geographical Sciences 2018年第3期28卷 351-366页

作者：胡浩王淑芳葛岳静 The Center for Modern Chinese City Studies East China Normal University Institute of Urban Development and Research East China Normal University Geo-studies Center Faculty of Geographical Science Beijing Normal University

As the improvement of international status and the implementation of China's neighboring diplomacy, the development of border regions and the security of border cities, as well as their spatial structure and regional differences are gaining more attention from academic circle. Based on the interdisciplinary perspectives of urban geography, regional economics and geopolitics, this paper explores the regional differences of border geo-cities in China and the surrounding countries with the help of remote sensing information acquisition and Arc GIS spatial analysis. Three primary results are found as follows:(1) The border geo-cities in China and surrounding countries are divided into five geographical regions: geo-cities in South China Sea, geo-cities in Southeast Asia, geo-cities in South Asia, geo-cities in Central Asia and geo-cities in Northeast Asia.(2) In the spatial structure system of China's border geo-cities, the importance of geo-cities in five major regions is fairly different. In terms of the security and economic development, the rank of priority is geo-cities in Northeast Asia, geo-cities in South China Sea, geo-cities in Central Asia, geo-cities in South Asia, geo-cities in Southeast Asia.(3) Considering China's geo-setting for the development of border geo-cities, the east region is significantly better than the west, and the north region is slightly better than the south.

关键词： geo-setting regional difference border regions border geo-cities China and the surrounding countries

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