检索结果-南通市图书馆

Dynamic analysis of agricultural green development efficiency in China: Spatiotemporal evolution and influencing factors

引用

Journal of Arid Land 2023年第2期15卷 127-144页

作者： LIU Yiping lu chengpeng CHEN Xingpeng Institute of County Economic Development&Rural Revitalization Strategy Lanzhou UniversityLanzhou 730000China College of Earth and Environmental Science Lanzhou UniversityLanzhou 730000China

Green development of agriculture is important for achieving coordinated and high-quality regional development for China. Using provincial data from 1990 to 2020, this work explored the dynamics of agricultural green development efficiency of 31 provinces in China, its spatiotemporal characteristics, and its driving factors using a super-efficiency slacks-based measure(Super-SBM), the Malmquist productivity index(MPI), spatial autocorrelation, and a geographic detector. Results showed that the overall agricultural green development efficiency showed a U-shaped trend, suggesting a low level of efficiency. Although a gradient difference was visible among eastern, central, and western regions, the efficiency gap narrowed each year. Technological progress and efficiency both promoted agricultural green development efficiency, especially technological progress. Agricultural green development efficiency had significant spatial aggregation characteristics, but Moran’s Ⅰ result showed a downward trend from 2015 to 2020, indicating a risk of spatial dispersion in the later stage. The provinces with high agricultural green development efficiency were mainly concentrated in the eastern region, while those with low efficiency were concentrated in the central and western regions. Agricultural green development efficiency was influenced by various factors, which showed differences according to time and region. The impact of the labor force’s education level and technological progress increased during the study period, and significantly facilitated agricultural green development efficiency in the eastern region, while the central and western regions were still affected by the scale level and environmental regulation, reflecting the advantages of the eastern region in terms of economy and technology. In the future, strengthening agricultural scientific and technological innovation and deepening interprovincial cooperation can help further improve the level of green agricultural deve

关键词： regional development economy technology spatial evolution influencing factors super-efficiency slacks-based measure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of the Northeast China Revitalization Strategy on Regional Economic Growth and Social Development

引用

Chinese Geographical Science 2020年第5期30卷 791-809页

作者： REN Wanxia XUE Bing YANG Jun lu chengpeng Key Laboratory of Pollution and Environment Engineering Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Key Lab for Environmental Computation and Sustainability of Liaoning Province Shenyang 110016China Ji-angho Architecture Northeastern UniversitShenyang 110016China Institute for County Economy Developments&Rural Revi-talization Strategy Lanzhou UniversityLanzhou 730000China

Measuring the economic and social effects of the Northeast China Revitalization Strategy is critical to addressing regional sustainable development in China. To shed light on this issue, an integrated perspective was adopted that is combined with the difference-in-differences method to measure the effects of the strategy on economic growth and social development in Northeast China. The findings suggest that the strategy has significantly improved regional economic growth and per-capita income by increasing its gross domestic product(GDP) and GDP per capita by 25.70% and 46.00%, respectively. However, the strategy has significantly worsened the regional employment in the secondary industry of the region. In addition, the strategy has not significantly improved regional infrastructural road, education investment or social security, and has had no significant effect on mitigating regional disparity. In addition, the policy effects are highly heterogeneous across cities based on city size and characteristics. Therefore, there is no simple answer regarding whether the Northeast China Revitalization Strategy has reached its original goals from an integrated perspective. The next phase of the strategy should emphasize improving research and development(R&D) and human capital investments based on urban heterogeneity to prevent conservative path-dependency and the lock-in of outdated technologies.

关键词： policy evaluation difference-in-differences(DID)method regional disparity urban heterogeneity regional revitalization old industrial base Northeast China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of Hausdorff fractal derivative to the determination of the vertical sediment concentration distribution

引用

International Journal of Sediment Research 2023年第1期38卷 12-23页

作者： Hongguang Sun Shiqian Nie Aaron I.Packman Yong Zhang Dong Chen chengpeng lu Chunmiao Zheng State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University College of Mechanics and Materials Hohai University College of Mathematics and Systems Science Shandong University of Science and Technology Department of Civil and Environmental Engineering Northwestern University Department of Geological Sciences University of Alabama Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences College of Hydrology and Water Resources Hohai University School of Environmental Science and Engineering Southern University of Science and Technology

The Rouse formula and its variants have been widely used to calculate the steady-state vertical concentration distribution for suspended sediment in steady sediment-laden flows, where the diffusive flux is assumed to be Fickian. Turbulent flow, however, exhibits fractal properties, leading to non-Fickian diffusive flux for sediment particles. To characterize non-Fickian dynamics of suspended sediment, the current study proposes a Hausdorff fractal derivative based advection-dispersion equation(HADE)model, where the Fickian diffusive flux in the Rouse model is replaced by a fractal derivative re-scaled using a constant diffusivity. The order of the Hausdorff fractal derivative is designed to characterize the influence of the multi-fractal turbulence structure on sediment diffusion. Applications show that the HADE model, with the analytical solution expressed using a stretched exponential function, can accurately describe the observed vertical concentration profiles for suspended sediment with different *** improvement well captures the non-exponential decay of the vertical sediment concentration in turbulent flow. Further analyses of measured sediment concentration profiles reveal that the Hausdorff fractal order decreases with the Rouse parameter, which describes the stronger impact of turbulent flow and a more uniform sediment concentration profile for smaller particles. Model comparisons also show that the HADE model provides better performance in describing the sediment concentration profiles than the improved Rouse formula and the standard fractional derivative advection-dispersion equation(FADE), which either under-or over-estimates vertical displacement of sediment particles, likely due to coherent turbulent structures.

关键词： Anomalous diffusion Hausdorff fractal derivative Vertical concentration distribution Suspended sediment Metric transform

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Spatial-temporal Evolution and Its Influencing Factors of Tourism Eco-efficiency in China

引用

Journal of Geographical Research 2022年第3期5卷 1-12页

作者： chengpeng lu Tianyang Ma Zhiliang Liu Institute of County Economic Development&Rural Revitalization Strategy Lanzhou UniversityLanzhou730000China School of Economics Lanzhou UniversityLanzhou730000China

Eco-efficiency is an invaluable indicator for the measurement of the relationship between production activities and environmental *** study measures the tourism eco-efficiency of 30 provinces in China from 2005 to 2020 based on the super-efficiency SBM model,and explores its spatial-temporal evolution characteristics using the kernel density function,standard deviation ellipse,and center of gravity ***,the influencing factors of the tourism eco-efficiency in China are analyzed by Tobit regression *** results show that the tourism eco-efficiency of China is generally fluctuating upwards,but has not yet reached the maximum production possibility *** kernel density curve shows a unimodal-bimodal-unimodal pattern,while the inter-provincial differences have been decreasing and becoming more *** center of gravity of tourism eco-efficiency is located at the junction of Henan and Hubei province and generally moves to the south(slightly to the southwest).Meanwhile,it is revealed that the level of economic development and the tourism eco-efficiency has a significant inverted U-shaped *** level of economic openness,traffic conditions,and tourism eco-efficiency is positively *** environmental regulations and industrial structure have a negative but limited impact on tourism ***,recommendations and suggestions for policy formulation to promote quality and sustainable development of the tourism industry are put forward,such as increasing investment in ecological protection and governance in tourism development,improving capacity-building in allocating green and low-carbon technologies and resources,strengthening tourism infrastructure construction,and enhancing environmental governance systems and mechanisms.

关键词： Tourism eco-efficiency Spatial pattern Influencing factors Spatial analysis China

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of Rural Tourism Resources based on the Tourists Perspective: A Case Study of Lanzhou City, China

引用

Journal of Resources and Ecology 2022年第6期13卷 1087-1097页

作者： PU Lili lu chengpeng CHEN Xingpeng College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China Institute of County Economic Development&Rural Revitalization Strategy Lanzhou UniversityLanzhou 730000China

Rural tourism has become a hot spot in China’s tourism development. Based on the AHP model and the comprehensive evaluation method of fuzzy cognition, this paper builds an evaluation system for the evaluation of rural tourism resources, including resource value, environmental factors, reception conditions with three criterion layers, and 25 evaluation factors. We recovered 574 valid questionnaires through two online forms and field research in Lanzhou city, and then used them to complete the empirical analysis. The results show four main aspects of the tourists’ perspective on rural tourism resources. Firstly, rural tourists are concerned about higher service facilities. The evaluation of rural tourism resources pays more attention to the reception conditions, and tourists pay more attention to the facilities of the reception conditions. In addition, the reception condition value accounts for a more concentrated 8–10 points(61.4%), which is higher than environmental elements(58.87%) and the value of the resource itself(54.26%). Secondly, tourists’ attention to rural tourism resources mainly focuses on the pleasurable(0.1152), tour line design(0.1014), experience(0.0765), ornamental(0.0747) and other aspects. Thirdly, the degree of cognition mainly focuses on nature(4508), environmental safety(4469), pleasantness(4387), accommodation conditions(4367), tour line design(4363) and other aspects of the rural tourism resources. Fourthly, the cognition of rural tourism resources is basically given priority with 6–9 points, and environmental factors accounted for the highest portion. However, rural tourists have higher expectations for the popularization and education of rural tourism resources, but the sense of acquisition is relatively low. Through the further improvement and improvement of the naturalness of environmental resources, environmental safety of reception conditions, and the enjoyment of external traffic and resource value, the overall benefit of rural tourism

关键词： rural tourism resources recognition tourist perspective AHP Lanzhou City

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

黄河流域甘肃段产业生态化空间演化及溢出机制

引用

地理科学 2023年第6期43卷 1122-1130页

作者：逯承鹏霍雨田兰州大学县域经济发展/乡村振兴战略研究院甘肃兰州730000 兰州大学经济学院甘肃兰州730000

构建产业生态化指数定量测度2005—2020年黄河流域甘肃段57个县域产业生态化发展水平并揭示其空间演化特征,采用空间杜宾模型验证其空间溢出效应并探析其空间传导机制。结果表明:黄河流域甘肃段产业生态化空间分异特征显著,呈“中心-外... 详细信息

构建产业生态化指数定量测度2005—2020年黄河流域甘肃段57个县域产业生态化发展水平并揭示其空间演化特征,采用空间杜宾模型验证其空间溢出效应并探析其空间传导机制。结果表明:黄河流域甘肃段产业生态化空间分异特征显著,呈“中心-外围”阶梯式扩散的空间格局。产业生态化空间辐射范围不断扩大,县域间空间自组织性和空间变异性不断增强,并在地理空间的各方向上随着与中心区域距离的扩大呈现出递减特征。产业生态化过程存在显著的正向空间溢出效应,产业发展水平、结构升级、发展活力及环境治理具有显著的正向促进作用,而资源消耗及污染排放具有抑制作用,通过交互影响与作用形成其空间传导路径与机制。

关键词：产业生态化空间溢出效应传导机制黄河流域

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

渗透系数空间变异性对低渗透地层中地下水溶质运移的影响

引用

河海大学学报（自然科学版） 2014年第2期42卷 137-142页

作者：王超束龙仓鲁程鹏河海大学水文水资源学院江苏南京210098

以天津市北大港水库为例,通过野外勘探、现场取样、室内试验、数值模拟等方法,研究水库库底地层渗透系数空间变异性对地下水溶质运移的影响。结果表明:北大港水库库底地层渗透系数较小,且呈现出较强的空间变异性;地下水流通量随地层渗... 详细信息

以天津市北大港水库为例,通过野外勘探、现场取样、室内试验、数值模拟等方法,研究水库库底地层渗透系数空间变异性对地下水溶质运移的影响。结果表明:北大港水库库底地层渗透系数较小,且呈现出较强的空间变异性;地下水流通量随地层渗透系数空间变异程度的增加而增大,渗透系数均值对水流通量的影响大于其标准差;渗透系数均值越大,在地下水流的抑制作用下,溶质运移程度越弱,而渗透系数空间变异性越强,地下水流的抑制作用相对越弱,溶质运移程度越强。

关键词：北大港水库库底地层渗透系数空间变异性地下水溶质运移

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

河流附近非水平初始面潜水渗流分析

引用

吉林大学学报（地球科学版） 2014年第1期44卷 295-300页

作者：曹彭强束龙仓鲁程鹏河海大学水文水资源与水利工程科学国家重点实验室南京210098

考虑初始面非水平条件,建立河流边界控制下的半无限含水层渗流模型,提出非水平初始面及其相关参数(a、tN)的简易计算方法,并探讨模型的适用条件。分析表明,该法适用于观测数据较少、地下水水位变幅相对于潜水含水层厚度较小、且观测孔... 详细信息

考虑初始面非水平条件,建立河流边界控制下的半无限含水层渗流模型,提出非水平初始面及其相关参数(a、tN)的简易计算方法,并探讨模型的适用条件。分析表明,该法适用于观测数据较少、地下水水位变幅相对于潜水含水层厚度较小、且观测孔距河岸较近条件下河流附近潜水含水层渗流计算。结合实例,采用查表法和配线法求解模型。计算结果表明:参数a和tN的计算值不同,水位计算误差在0.02m以内,较原公式精度有明显提高。新模型为初始面非水平条件下的潜水渗流计算提供一种简易方法。

关键词：河流半无限含水层潜水非稳定流非水平初始面

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

东北老工业区生态安全动态演变过程及驱动力

引用

生态学报 2017年第22期37卷 7474-7482页

作者：唐呈瑞逯承鹏杨青姜璐任婉侠薛冰中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室沈阳110016 辽宁省环境计算与可持续发展重点实验室沈阳110016 中国科学院大学北京100049 兰州大学资源环境学院兰州730000

生态安全与国防安全、经济安全、金融安全等已具有同等重要的战略地位,并成为未来经济社会安全的主要约束。东北老工业区作为我国重要的老工业基地及粮食生产基地,其生态安全状况关系着中国可持续发展战略的实施。采用能值-生态足迹模型... 详细信息

生态安全与国防安全、经济安全、金融安全等已具有同等重要的战略地位,并成为未来经济社会安全的主要约束。东北老工业区作为我国重要的老工业基地及粮食生产基地,其生态安全状况关系着中国可持续发展战略的实施。采用能值-生态足迹模型,对东北老工业区2000—2014年生态安全动态演变过程进行时间序列的定量分析,并采用主成分分析方法分析其驱动力。结果表明:研究期内,人均能值生态承载力从0.66 hm2/人下降到0.64 hm2/人,人均能值生态足迹由10.58 hm^2/人增加到19.85 hm^2/人,处于生态赤字状态,且赤字增大趋势明显;生态压力指数与生态安全等级均不断增大,生态安全状况呈恶化趋势,生态安全问题亟待解决,而这是由社会经济、人口状况、资源环境、技术水平及土地利用程度等因素共同驱动的结果。最后,提出了改善东北老工业区生态安全状况的对策建议。

关键词：生态安全能值一生态足迹模型演变过程驱动因子东北老工业区

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

三江平原典型区河水与地下水水量交换的时空变化规律分析

引用

水利学报 2021年第10期52卷 1151-1162页

作者：束龙仓殷晓然袁亚杰吕岩鲁程鹏刘波河海大学水文水资源学院江苏南京210098 河海大学水文水资源与水利工程科学国家重点实验室江苏南京210098 黑龙江省水文水资源中心黑龙江哈尔滨150001 黑龙江省佳木斯水文水资源中心黑龙江佳木斯154002

地下水与河水之间的水量交换具有复杂的过程,受地形地貌、水文及水文地质条件等的影响。以松花江、黑龙江、挠力河及乌苏里江4条河流作为边界的三江平原典型区为例,通过补充水文地质勘察,结合2000—2018年河水位及地下水位动态的空间分... 详细信息

地下水与河水之间的水量交换具有复杂的过程,受地形地貌、水文及水文地质条件等的影响。以松花江、黑龙江、挠力河及乌苏里江4条河流作为边界的三江平原典型区为例,通过补充水文地质勘察,结合2000—2018年河水位及地下水位动态的空间分布,对该地区河流代表性河段河水与地下水水量交换的时空变化规律进行深入分析。结果表明:三江平原典型区四周河流代表段的河水与地下水的水力联系较强,研究期内50%以上的年份两者的水位变化呈显著或高度相关,其中松花江富锦段地下水位与河水位相关性最强,挠力河菜咀子段和乌苏里江海青段次之,黑龙江勤得利段最弱;多年平均背景下,挠力河菜咀子段为地表水补给地下水,松花江富锦段、乌苏里江海青段及黑龙江勤得利段皆为地下水补给地表水;松花江富锦段多年平均地表水地下水单宽交换量为10^(-2)m^(3)(/d·m)量级,黑龙江勤得利段为10^(-5)m^(3)(/d·m)量级,挠力河菜咀子段为10^(-3)m^(3)(/d·m)量级,乌苏里江海青段为10^(-3)m^(3)(/d·m)量级;相关系数与地表水地下水单宽交换量大小存在正相关,相关系数越大,单宽交换量越大,MK趋势检验结果表明,各河流代表性河段单宽交换量均存在减小趋势,其中乌苏里江海青段趋势显著,松花江富锦段趋势最小;松花江富锦段单宽交换量年际和年内波动强烈且均占主导地位,年内尺度下仅6月份为显著减小趋势,未构成年际尺度下显著减小的整体趋势,水量交换变化频繁、规律性较弱;黑龙江勤得利段年际及年内尺度波动均占主导地位,与松花江情况类似但波动程度较弱,年内尺度下不存在显著变化趋势,因此未构成显著减小的整体趋势;挠力河菜咀子段主要以年际尺度波动,1—5月存在显著减小趋势,但未增大年内尺度波动,且未构成显著减小的整体趋势;乌苏里江海青段主要为年内尺度波动,6—9月及12月的显著减小趋势增大了年内波动,且构成了显著减小的整体趋势。研究结果可为三江平原典型区水资源评价提供科学依据,为该地区水资源的科学开发利用提供理论参考。

关键词：河流含水层地表水与地下水水量交换时空变化规律

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：