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An extended input-output table for environmental and resources accounting
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作者 Feng Wu Jinyan Zhan +1 位作者 Chenchen Shi Chunhong Zhao 《Chinese Journal of Population,Resources and Environment》 2014年第1期33-41,共9页
Environmentally Extended Input-Output(EEIO)tables have become a powerful element in supporting information-based environmental and economic policies.National-and provincial-level 10 tables are currently published by t... Environmentally Extended Input-Output(EEIO)tables have become a powerful element in supporting information-based environmental and economic policies.National-and provincial-level 10 tables are currently published by the National Bureau of Statistics of the People's Republic of China according to well-defined conventions.However,county-level 10tables are not provided as a rule by official statistics organizations.This paper conducts an overview of compiling EEIO tables for environmental and resources accounting at the county level and then answers several questions:First,what kind of data should be prepared for the compilation of county-level EEIO tables?Second,how can we set up comprehensive EEIO tables at the county level?Third,regarding the survey methods and the indirect modeling,which one should be chosen to build EEIO tables at the county level?Finally,what policy questions could such a table answer?EEIO tables at the county level can be used to predict the economic impacts of environmental policies and to perform trend and scenario analysis. 展开更多
关键词 county-level input-output table ACCOUNTING influence coefficients
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Importance measurement of domestic and foreign firms in Chinese provinces:A multi-regional input-output table based on the double extension of geographic regions and firm ownerships
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作者 Fangke Liu Lizhi Xing 《Journal of Data and Information Science》 2025年第4期13-43,共31页
Purpose:The study evaluates the relative roles of Domestic-Funded Enterprises(DFEs)and Foreign-Funded Enterprises(FFEs)across Chinese provinces.It further examines how industrial structures differ by ownership at both... Purpose:The study evaluates the relative roles of Domestic-Funded Enterprises(DFEs)and Foreign-Funded Enterprises(FFEs)across Chinese provinces.It further examines how industrial structures differ by ownership at both regional and national scales.Drawing on these findings,the analysis traces the geographic shift of FFEs and offers evidence-based guidance for shaping foreign investment policy.Design/methodology/approach:This study uses Inter-Country Input-Output(ICIO)and Inter-Region Input-Output(IRIO)tables to build two extended datasets:Ownership-Extended Inter-Country Input-Output(OE-ICIO)and Ownership-Extended Multi-Region Input-Output(OE-IRIO)tables.These are then combined to construct the Regionally-Ownership Dually-Extended Multi-Regional Input-Output(RODE-MRIO)table and Global Domestic and Foreign Enterprises Network(GDFEN)model to explore the industrial relocation trends of FFEs in China.Findings:The results indicate that:(1)From 2010 to 2019,FFEs in China showed an overall decline in influence,profitability,and network robustness.(2)Eastern and developed regions saw a clear retreat of FFEs,with a shift toward domestic control.Central regions and more developed regions played a transitional role.Moreover,western and less developed regions remained stable but still relied on low-end and resource-based activities.(3)FFEs’influence has been gradually shifting towards less-developed central and western provinces due to rising labor costs and stricter environmental regulations.Research limitations:First,only general policy recommendations are proposed,without exploring the design of specific policy instruments.Second,the significant impact of recent trade measures on the behavior of FFEs has not been considered.Third,further research is needed to deepen the analysis by comparing regional ownership dynamics in China with those in other major economies.Practical implications:This research provides valuable insights for policymakers aiming to enhance regional economic development and improve China’s position within Global Value Chains(GVCs).Originality/value:The originality of this paper lies in its development of a new model that combines geographic,sectoral,and ownership dimensions.This model allows for a clearer analysis of the roles of foreign and DFEs in China’s regional economy.It offers insights into industrial transfer trends within global value chains and provides a framework for analyzing and forecasting future shifts. 展开更多
关键词 Multiregional input-output tables Global Value Chain Reconfiguration Industry Shift Development Heterogeneity
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Input-Output Analysis of the Impact of Environmental Regulation on Chinese Industries
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作者 董敏杰 梁泳梅 《China Economist》 2011年第4期40-52,共13页
In this paper, we attempted to calculate the impact of environmental regulation on the international competitiveness of China's industries. Calculations are based on the input-output model that incorporates pollution... In this paper, we attempted to calculate the impact of environmental regulation on the international competitiveness of China's industries. Calculations are based on the input-output model that incorporates pollution control costs. We took enterprises 'pollution control costs as the substitute variable for environmental regulation and price changes to measure the impact on international competitiveness for all sectors. Our studies reported three findings. First, price rises caused by pollution control costs were not more than 4 per cent in the manufacturing and trade sectors in 2007. Second, although the charging rate on pollutant discharge has become increasingly higher since 2003, the resultant price rise is only around O. 5 per cent across all sectors. Third, the impact brought about by increasingly stronger environmental regulation is limited and the resultant price rise does not exceed 2 per cent. Thesefindings indicate that the impact of environmental regulation on China's trade sectors is affordable. Therefore, it is needless to worry that environmental regulation will weaken the international competitiveness of Chinese products. 展开更多
关键词 environmental regulation input-output model price level exportcompetitiveness
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PIVOT TABLE在监测数据统计中的应用
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作者 白爱民 《环境科学导刊》 2014年第5期101-104,共4页
汇总环境数据,进行数据分析,编制环境监测报表是环境监测部门的例行工作之一。PIVOT TABLE可以快速编制各类统计报表。以云南省环境空气质量报表为例,叙述了PIVOT TABLE的使用方法和优点。
关键词 PIVOT table 数据 处理 分析 环境统计 报表 编制
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Effect of Perched Water Tables on Aluminosilicate Stability and Soil Genesis 被引量:4
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作者 ZHANG MIN , GONG ZITONG and A. D. KARATHANASIS College of Resources and Environment, Shandong Agricultural University, Tai’an 271018 (China) Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) College of Agriculture, U 《Pedosphere》 SCIE CAS CSCD 2000年第3期247-256,共10页
The mineral stability and solute activities of soil solution extracted from selected horizons of seven studied pedons of Alfisols in Kentucky, USA, and the relationship between distribution of iron-manganese concretio... The mineral stability and solute activities of soil solution extracted from selected horizons of seven studied pedons of Alfisols in Kentucky, USA, and the relationship between distribution of iron-manganese concretions and the restrictive layers were investigated. The results showed that the genesis and development of these soils and mineral weathering trends were strongly influenced by the depth of bedrock and the presence of perched water tables at lithic (limestone) interfaces due to the dissolution and buffering effect of limestone bedrock. The extractable Mg/Ca ratio as depth function and soil depth above bedrock could be used as indices of weathering and degree of soil development. Maximum iron-manganese concretion accumulation was found to occur in the horizon overlying clay horizon (>40% clay) with a sharp increase in clay content (>10%), which suggested that zones of Fe-Mn concretion accumulation in soils of the Inner Bluegrass Region appeared to be a sensitive genetic indicator of argillic horizons with restrictive permeability. 展开更多
关键词 iron-manganese concretion perched water table soil environment soil genesD
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Water Environmental Degradation of the Source Area of the Yellow River on Northeast Qinghai-Tibet Plateau
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作者 Qi Shanzhong Luo Fang Xiao Honglang 《Chinese Journal of Population,Resources and Environment》 北大核心 2005年第3期34-36,共3页
The issue on water environmental degradation in the source area of the Yellow River has been one of very serious ecological and socially economic problems.The temporal-spatial changes of water environment led to the d... The issue on water environmental degradation in the source area of the Yellow River has been one of very serious ecological and socially economic problems.The temporal-spatial changes of water environment led to the decreasing of land capacity and river disconnecting.The status of water environmental degradation in this paper was analyzed based on the data and field investigation.The results indicated that the surface water area in the region has obviously decreased owing to the climate changes and human irrational use of water resources and the continuous lowering of the regional groundwater table and the steadily decreasing tendency of the flow rate in the source areas of the Yellow River. 展开更多
关键词 water environmental degradation decreasing of surface water continuous lowering of groundwater table the Yellow River region Qinghai-Tibet Plateau
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Spatiotemporal evolution and driving factors of global production networks:An analysis based on the input-output technique 被引量:6
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作者 ZHENG Zhi CHEN Wei +1 位作者 LIANG Yi ZHANG Yajing 《Journal of Geographical Sciences》 SCIE CSCD 2021年第5期641-663,共23页
Global production networks have become the most important organizational platforms for coordinating international production activities,and their evolution patterns profoundly affect value distribution across the worl... Global production networks have become the most important organizational platforms for coordinating international production activities,and their evolution patterns profoundly affect value distribution across the world.In this study,we shall firstly carry out an in-depth quantitative research to analyze the patterns and evolution of global production networks,using a long time-sequenced multi-region input-output table and the network analysis approach.Then based on the method of value-added decomposition,we will develop an index system to measure the degree of participation of regions in global production networks.Finally,we will try to identify the factors affecting the degree of participation of countries in global production networks by constructing a regression model.The results show that from 1995 to 2015,the evolution of global production networks measured by input-output linkages experienced four stages:expansion,contraction,re-expansion,and re-contraction.In addition,the core communities of global production networks evolved from two major production communities(Europe and the Americas)to three pillars(Europe,Americas,and Asia)while more segmented communities are mainly affected by geographical proximity.The latter consists of European,North American,South American,African and Asian communities.The evolution of the global production network pattern primarily manifests as a process of cooperation strengthening or weakening among communities,based on changes in the external environment and the need for individual development strategies.Meanwhile,the United States,Germany,and the United Kingdom have consistently ranked among the top entities in global production networks,whereas China,Russia,and Southeast Asia have the fastest rises in ranking.In addition,government efficiency,resources endowment,infrastructure conditions and technology levels play important roles in the participation in global production networks. 展开更多
关键词 input-output table network analysis evolution pattern value-added decomposition participation degree indicator system
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A Generalization of the Input-Output Pollution Control Model and Product Selection
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作者 Aniekan Ebiefung 《Applied Mathematics》 2013年第2期360-362,共3页
The input-output pollution control model given in [1] is generalized. The generalization makes it easier for the model to handle many problem instances. A linear program is used to solve the new model. An example is g... The input-output pollution control model given in [1] is generalized. The generalization makes it easier for the model to handle many problem instances. A linear program is used to solve the new model. An example is given to show that the new model can handle classes of problems that the original model cannot handle. 展开更多
关键词 input-output POLLUTION environment TECHNOLOGY Leontief PRODUCTION Model
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Evidence-Based Plan for Environmental Cleaning of Operating Room: Impact on High-Frequency Contact Surfaces
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作者 Liping Feng Ke Lin +5 位作者 Binfang Hong Qingluan Duan Yuying Wang Qi Fan Jing Bai Chengxin Sun 《Journal of Clinical and Nursing Research》 2026年第2期374-384,共11页
Objective: To develop an evidence-based plan for cleaning operating room and evaluate the impact on high-frequency contact surfaces. Method: The evidence application model of the JBI Evidence-Based Nursing Center was ... Objective: To develop an evidence-based plan for cleaning operating room and evaluate the impact on high-frequency contact surfaces. Method: The evidence application model of the JBI Evidence-Based Nursing Center was utilized to create a strategy, which was implemented in a tertiary-level hospital in Yunnan Province. The adenosine triphosphate (ATP) biological biofluorescence detection method was used to assess the quality of cleaning before and after the intervention. Results: A total of 17 quality review indicators were established in this study. Following the application of evidence, the implementation rate for 16 quality review indicators increased significantly, from a range of 0-65.8% to 81.5-100%. Moreover, the pass rate of ATP bioluminescence detection on high-frequency contact surfaces increased from 14.07% to 47.19%, with significant difference (p < 0.05). Conclusion: The evidence-based environmental cleaning program proved to enhance the overall cleanliness of operating room and reduce the risk of surgical infections. This strategy holds promise for effective cleaning of operating room. 展开更多
关键词 environmental cleaning scheme High frequency contact table Operating room Evidence-based practice Management
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Estimation of regional physical imports and exports of EW-MFA in China using monetary input-output tables 被引量:2
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作者 Nan LI Tianzhu ZHANG 《Frontiers of Environmental Science & Engineering》 SCIE EI CAS CSCD 2013年第2期242-254,共13页
Given the statistical gaps in material flow among provinces in China, a method was introduced to estimate regional physical imports and exports (RPIE), which includes international and interregional imports/ exports... Given the statistical gaps in material flow among provinces in China, a method was introduced to estimate regional physical imports and exports (RPIE), which includes international and interregional imports/ exports. This method uses provincial monetary input- output tables (MIOT) and international trade statistics. A coefficient matrix representing correlations between monetary value and physical mass for years 2000-2009 was obtained based on a detailed commodity classification and 22 material production sectors in MIOT. With the coefficient matrix as reference, RPIE was measured. Pilot calculation of both regional physical trade balance and domestic material consumption, as well as a brief analysis of these methods, were conducted using 2002 data. 展开更多
关键词 economy-wide material flow accounts (EW-MFA) monetary input-output table (M1OT) regionalphysical imports and exports estimation
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Analysis of the spatiotemporal evolution and drivers of environmental inequality based on well-being equity:evidence from Western China
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作者 Weiguo Fan Wanqing Nie +2 位作者 Nan Chen Shiyu Zhang Xuechao Wang 《Frontiers of Environmental Science & Engineering》 2025年第7期35-53,共19页
Interregional trade facilitates the transfer of implied human economic well-being(HEW)and integrated environmental pressure(IEP).The mismatch between them leads to environmental inequality.A comprehensive evaluation i... Interregional trade facilitates the transfer of implied human economic well-being(HEW)and integrated environmental pressure(IEP).The mismatch between them leads to environmental inequality.A comprehensive evaluation index system for HEW is constructed.Based on the multiregional input-output(MRIO)model,the HEW,water,carbon,and land footprints of the Hexi Corridor Economic Belt in China were measured in 2012,2015,and 2017.Three types of environmental footprints were integrated into the IEP,and structural decomposition analysis(SDA)was used to explore the interregional transfer and driving factors of changes in HEW and IEP.A regional environmental inequality(REI)index was constructed to assess the environmental inequality among cities in the Hexi Corridor.Results show that environmental inequality in the Hexi Corridor is severe and intensifying.The focus is that Jiuquan absorbs more HEW from other cities in the interregional trade,but transfers IEP to Jiayuguan and other places.The main factors affecting the flow changes of HEW and IEP are production structure and final demand structure.Due to differences in resource endowments,Jiayuguan bears great environmental pressure without sufficient economic compensation,which is unfavorable for regional coordinated and sustainable development.Therefore,it is recommended to introduce clean production technology,transfer polluting production to reduce the productive environmental footprint of Jiayuguan,develop high-tech,and promote the growth of regional HEW driven by surrounding cities.The study findings help address environmental inequality and promote sustainable growth of economic well-being in Western China and provide a reference for similar research. 展开更多
关键词 Interregional trade environmental inequality Human economic well-being Integrated environmental pressure Multi-regional input-output model Structural decomposition analysis
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Extracting critical paths for synergistic control of carbon emissions and air pollution:Case of Henan Province
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作者 Ningwei Wang Shanshan Wang +3 位作者 Yeke Li Yingying Zhao Tiantian Chun Ruiqin Zhang 《Journal of Environmental Sciences》 2025年第9期235-249,共15页
Synergistic reduction of carbon emissions and air pollution is the core means to address the two major strategic tasks of fundamentally improving the ecological environment and the‘Dual-carbon target’.The issue of s... Synergistic reduction of carbon emissions and air pollution is the core means to address the two major strategic tasks of fundamentally improving the ecological environment and the‘Dual-carbon target’.The issue of synergistic reduction at the provincial level needs to be addressed as a matter of urgency.Taking Henan Province,the largest economy in central China,as an example,this study uses environmentally extended input-output analysis and structural path analysis to identify the key sectors that contribute to CO_(2),SO_(2),and total particulate matter(TPM)emissions,and to sort out key emission pathways(e.g.,Final Demand→Sector…).The results indicate that S2(Mining of Fossil Energy),S10(Nonmetal Mineral Products),S11(Metal Smelting),S13(Power and Heat)and S17(Transportation)are mainly responsible for CO_(2),SO_(2),and TPM direct emissions on the production side,while S16(Construction),S12(Equipment)and S18(Services)account for more than 45%of CO_(2),SO_(2),and TPM embodied emissions on the consumption side.32 shared emission pathways are extracted from the top 100 pathways for CO_(2),SO_(2),and TPM emissions,which account for 27%-51%of total emissions in Henan Province.P9(Export→Nonmetal Mineral Products),P10(Export→Metal Smelting)and P21(Gross Capital Formation→Construction→Nonmetal Mineral Products)are the leading paths responsible for embodied emissions.The research results provide the foundation and guidance for well-designed mitigation policies,as well as a reference for better synergistic control in provinces facing similar situations. 展开更多
关键词 Synergistic control environmentally extended input-output analysis Structural path analysis Supply chains Embodied emissions
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Using Fundamental Economic Structures to Estimate Chinese Regional Input-Output Tables
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作者 Xuemei Jiang Rencheng Tong 《Journal of Systems Science and Information》 2008年第3期227-236,共10页
The estimation of regional input-output tables is well discussed in the literature and a large variety of methods exist. In this paper we will use the concept of fundamental economic structure (FES) to estimate the ... The estimation of regional input-output tables is well discussed in the literature and a large variety of methods exist. In this paper we will use the concept of fundamental economic structure (FES) to estimate the matrix of intermediate deliveries for some "missing" region(s). Furthermore, the estimates will be compared with the estimates obtained from "traditional" estimating techniques, including regionalization on the basis of the national table, and borrowing coefficients from similar regions. The results show FES is very helpful for compiling regional tables of China. 展开更多
关键词 FES regional input-output tables ESTIMATION
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中国典型地区地下水位对环境的控制作用及阈值研究 被引量:28
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作者 赵辉 陈文芳 崔亚莉 《地学前缘》 EI CAS CSCD 北大核心 2010年第6期159-165,共7页
研究采用理论分析和实践成果相结合、区域宏观分析与典型地区深入剖析相结合的研究方法,从地下水不合理开发利用引起的环境问题出发,选取华北地区、西北地区以及沿海地区作为典型区,分析地下水位对环境的控制作用,提出了具有针对性的地... 研究采用理论分析和实践成果相结合、区域宏观分析与典型地区深入剖析相结合的研究方法,从地下水不合理开发利用引起的环境问题出发,选取华北地区、西北地区以及沿海地区作为典型区,分析地下水位对环境的控制作用,提出了具有针对性的地下水位控制阈值。华北平原有利于山前调蓄的地下水位埋深为10m、中东部平原浅层控制土壤盐渍化水位埋深为2~3 m、防止地裂缝的水位埋深为7 m、深层控制地面沉降水位埋深为50 m、浅埋岩溶区地下水位应控制在岩溶含水层上覆的松散岩类的底板高程(2 m)之上;西北地区控制天然植被衰败的地下水位埋深为2.0~4.5 m和人工绿洲灌溉期控制土壤盐渍化的地下水位埋深为1.2~1.5 m,非灌溉期中冻结期地下水位埋深1.3~1.5 m,冻融期为2.2~2.7 m;沿海地区防止海水入侵的地下水位阈值应控制在漏斗中心水位高程-5^-6 m,最大不超过-8 m。上述地下水位控制阈值的确定,为实施地下水总量控制和水位控制管理提供了科学依据。 展开更多
关键词 地下水位 环境问题 阈值
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濒危植物秦岭冷杉种群数量动态 被引量:80
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作者 张文辉 许晓波 +1 位作者 周建云 谢宗强 《应用生态学报》 CAS CSCD 北大核心 2005年第10期1799-1804,共6页
为了对濒危植物秦岭冷杉种群数量动态评价和预测,通过样地调查和数据统计,研究了秦岭冷杉种群的年龄结构、静态生命表及其与环境因子关系,运用时间序列模型预测了种群数量动态.结果表明,多数秦岭冷杉种群幼龄级个体数较少,中老龄个体数... 为了对濒危植物秦岭冷杉种群数量动态评价和预测,通过样地调查和数据统计,研究了秦岭冷杉种群的年龄结构、静态生命表及其与环境因子关系,运用时间序列模型预测了种群数量动态.结果表明,多数秦岭冷杉种群幼龄级个体数较少,中老龄个体数量较大,呈衰退趋势.仅处于低海拔地区的秦岭冷杉木蓝苔草群丛中的种群(D种群)由于立地条件较好,幼龄级个体数量相对丰富,种群稳定.不同秦岭冷杉种群生命表和存活曲线的分析表明,尽管生境条件差异,但存活曲线基本接近DeeveyⅢ型;不同种群偏离典型存活曲线的程度与幼苗缺乏程度有关,一般Ⅲ~Ⅴ龄级死亡率较高.时间序列分析表明,在未来20、40和80年中,不同秦岭冷杉种群均会呈现老龄级株数先增后减的趋势,种群稳定性长期维持困难.对影响秦岭冷杉种群增长的10个环境因子通过主成分分析(PCA)发现,乔木层盖度、土壤有机质含量和空气湿度对种群发挥有利影响,而人为干扰和光照强度对秦岭冷杉种群增长发挥不利影响.应充分利用秦岭冷杉性喜荫、耐寒、种子活力较强的特点,加强现有林分就地保护,重点是具有结实能力的中老龄个体;在阴坡地带,对林下灌木比较密集的群丛,通过砍灌、清理林下活地被物等抚育措施,为幼苗发育创造良好的环境条件;就地采种育苗,扩大人工种群. 展开更多
关键词 年龄结构 生命表 存活曲线 环境因子 时间序列
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复合离心机振动台系统的研究现状 被引量:10
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作者 贺云波 简林柯 +2 位作者 林廷圻 闫桂荣 牛宝良 《中国机械工程》 EI CAS CSCD 北大核心 1999年第5期576-579,共4页
随着航空航天、地震模拟和土工技术等领域的高速发展,迫切需要将振动台安装在离心机上进行复合加速度-振动环境试验。结合国外在离心机上使用振动台模拟环境试验的应用,讨论了复合离心机振动台系统中的关键部件的作用、分类和安装方... 随着航空航天、地震模拟和土工技术等领域的高速发展,迫切需要将振动台安装在离心机上进行复合加速度-振动环境试验。结合国外在离心机上使用振动台模拟环境试验的应用,讨论了复合离心机振动台系统中的关键部件的作用、分类和安装方式,并对其性能进行了对比和综合评价,介绍了国外在这一领域的成功实例。 展开更多
关键词 振动台 离心机 加速度 环境试验 离心力
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黄河流域地下水资源状况及其生态环境问题 被引量:49
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作者 韩双宝 李甫成 +10 位作者 王赛 李海学 袁磊 刘景涛 申豪勇 张学庆 李长青 吴玺 马涛 魏世博 赵敏敏 《中国地质》 CAS CSCD 北大核心 2021年第4期1001-1019,共19页
黄河流域是中国重要的生态屏障和经济地带,上中下游面临着不同生态环境问题,水在生态环境问题的形成演化过程中起着重要作用。本文从黄河流域地下水动态特征、地下水资源的数量、质量及开发利用等方面,分析了黄河流域地下水资源及饮水... 黄河流域是中国重要的生态屏障和经济地带,上中下游面临着不同生态环境问题,水在生态环境问题的形成演化过程中起着重要作用。本文从黄河流域地下水动态特征、地下水资源的数量、质量及开发利用等方面,分析了黄河流域地下水资源及饮水安全状况。黄河流域年度地下水资源量393.55亿m3,银川平原、河套平原等7处主要平原(盆地)地下水资源量为81.91亿m3,占比超过20%;黄河流域地下水质量以Ⅰ~Ⅳ类为主,劣质地下水主要受总硬度、硫酸盐、铁、溶解性总固体等天然原生组分影响,砷、氟、硒、碘等原生组分超标是流域部分地区地下水饮水安全的主要威胁;2020年与2019年同期相比,黄河流域地下水位呈上游稳定、中游局部上升、下游下降的态势,主要地下水降落漏斗形态基本稳定。针对黄河源区、宁蒙河套平原等重点区段,分析了存在的主要生态环境问题,提出了全面开展流域水文地质与水资源调查评价,深入开展黄河流域及重点地区水平衡分析等工作建议。 展开更多
关键词 黄河流域 地下水资源 地下水位 生态环境问题 水平衡分析
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武夷山米槠种群数量动态分析 被引量:5
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作者 郭连金 李永娥 李梅 《西北林学院学报》 CSCD 北大核心 2007年第5期27-31,共5页
对武夷山自然保护区米槠种群数量动态进行了系统研究。结果表明,武夷山自然保护区米槠种群基本属于进展型或稳定型,幼龄级个体多,中老龄级个体少。不同海拔的种群密度存在差异,其中C种群密度最大;静态生命表显示,种群在Ⅰ、II径级时死... 对武夷山自然保护区米槠种群数量动态进行了系统研究。结果表明,武夷山自然保护区米槠种群基本属于进展型或稳定型,幼龄级个体多,中老龄级个体少。不同海拔的种群密度存在差异,其中C种群密度最大;静态生命表显示,种群在Ⅰ、II径级时死亡率较高,随着年龄增加,死亡率逐渐降低,但到了Ⅳ、Ⅴ径级,由于生理衰老死亡率又上升;种群期望寿命在II、Ⅲ、Ⅳ径级较高,随着年龄增加,期望寿命逐渐下降;不同海拔的米槠种群的存活曲线均接近于D eeveyⅢ型。米槠种群动态是环境因素与生物学特性共同作用的结果,其中大气湿度、光照和土壤有机质等影响较大。在武夷山自然保护区,米槠种群应该以保护为主,适当抚育的措施,促进群落持续发育。 展开更多
关键词 年龄结构 生命表 存活曲线、环境因子分析
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环境技术创新、产业间关联与工业环境绩效 被引量:3
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作者 李江娜 钟廷勇 何玲 《哈尔滨商业大学学报(社会科学版)》 CSSCI 2019年第2期89-97,112,共10页
环境技术创新是改善环境绩效、推动产业绿色化转型的重要途径,但是仍缺乏这方面的实证检验。基于中国2002—2012年投入产出表和手工收集的环境技术创新数据,实证检验了环境技术创新对工业企业环境绩效的影响。研究发现,环境技术创新通... 环境技术创新是改善环境绩效、推动产业绿色化转型的重要途径,但是仍缺乏这方面的实证检验。基于中国2002—2012年投入产出表和手工收集的环境技术创新数据,实证检验了环境技术创新对工业企业环境绩效的影响。研究发现,环境技术创新通过直接效应和间接效应减少环境污染;基于供应链的产业间关联,上游行业的环境技术创新通过跨部门市场交易能够有效改善下游行业环境绩效;区域内产业环境技术创新和区域外环境技术创新作为改善环境绩效两个渠道具有同样重要作用。 展开更多
关键词 环境技术创新 环境绩效 产业间关联 投入产出表
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北京经济系统物质流投入产出表的编制及其分析 被引量:6
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作者 张颖 单永娟 韩雪梅 《自然资源学报》 CSCD 北大核心 2009年第3期514-522,共9页
为了对北京经济系统物质利用效率和污染物质对环境的影响进行分析,论文在物质流分析方法的基础上,根据投入产出表的原理,探索性地编制了2004年北京物质流投入产出表,并对基本结果进行了分析。结果表明,2004年北京的进口物质总量比出口多... 为了对北京经济系统物质利用效率和污染物质对环境的影响进行分析,论文在物质流分析方法的基础上,根据投入产出表的原理,探索性地编制了2004年北京物质流投入产出表,并对基本结果进行了分析。结果表明,2004年北京的进口物质总量比出口多2826.22×104t,经济发展主要依靠从区外进口物质,是显著的外界资源依赖型发展模式。研究也表明,北京地区的废气排放中CO2占有很大的比重,是影响北京环境质量的一个重要因素。同时,北京固体废弃物和废水的再资源化利用率比较低,分别占直接投入物质的0.25%和5.20%。研究建议,北京迫切需要进一步改进经济增长方式,提高资源的使用效率和利用率,尤其是要通过技术进步和产业结构调整提高资源的再利用率,减少对环境的影响。 展开更多
关键词 环境与生态统计 物质流分析 投入产出表 经济系统 北京
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