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Wetland and habitat dynamics in the evolving landscape of the Middle Yangtze River Basin

Journal of Geographical Sciences 2025年第1期 88-111页

作者： YANG Peng SUN Kaiya ZHU Yanchao XIA Jun HUANG Heqing SONG Jingxia SHI Xiaorui LU Xixi Hubei Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information Engineering China University of Geosciences department of geography National University of Singapore State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

Wetlands play a critical role in the global environment. The Middle Yangtze River Basin(MYRB), known for its abundant wetland resources, has experienced notable changes resulting from the complex interplay of environmental factors. Therefore, we investigated the spatiotemporal characteristics of wetland ecological quality in the MYRB from 2001 to *** the random forest(RF) regression algorithm and patch-generated land-use simulation(PLUS) model, we forecasted variations in wetland habitat quality and their determinants under the Shared Socioeconomic Pathway-Representative Concentration Pathway(SSPRCP) framework from 2035 to 2095. The main findings are as follows:(1) The RF algorithm was optimal for land-use and land-cover(LULC) classification in the MYRB from 2001 to 2020,when notable changes were observed in water bodies and buildings. However, the forested area exhibited an increase and decrease of 3.9% and 1.2% under the SSP1-2.6 and SSP5-8.5 scenarios, respectively, whereas farmland exhibited a diminishing trend.(2) Wetlands were primarily concentrated in the central and eastern MYRB, with counties in the southwest exhibiting superior ecological-environmental quality from 2001 to 2020. Notably,wetland coverage revealed significantly high level, significant changes, frequent but relatively minor changes under the SSP1-2.6, SSP2-4.5, and SSP 5-8.5 scenarios, respectively.(3)Regions with lower habitat quality were primarily concentrated in urbanized areas characterized by frequent human activities, indicating a clear degradation in habitat quality across different scenarios. In conclusion, we established a foundational framework for future investigations into the eco-hydrological processes and ecosystem quality of watersheds.

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Tracing the provenance of aeolian loess in the Yangtze River Delta through zircon U–Pb age and geochemical investigations

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Journal of Mountain Science 2018年第4期15卷 708-721页

作者： QIAN Peng ZHENG Xiang-min CHENG Jun HAN Yu-jie DONG Yan ZHANG Jian-guo School of geography Nantong University department of geography East China Normal University School of geosciences University of South Florida

Given the conflicts over the proposed formation mechanisms of Xiashu loess, the question of the provenance of sediments comprising the Xiashu loess in the Yangtze River Delta has not been satisfactorily resolved. In this study, the provenance of aeolian sediments of the Yangtze River Delta, China was examined by applying the detrial zircon U–Pb dating technique, Sr–Nd isotopic and trace element compositional analysis. U-Pb dating analysis was conducted on the Xiashu loess at three locations over the Yangtze River Delta, including Huangnishan(HNS) hill, Shengshan(SS) island and the Xuancheng(XC) area. The Xiashu loess and the sediments of the Yangtze River Valley share considerable similarity in their zircon U-Pb age spectra with the same main age peak and comparable age distribution. By contrast, significant differences in the age spectra, existbetween the Xiashu loess and loess deposits of Chinese Loess Plateau(CLP). Coarse grains of the Yangtze River Delta loess may have a proximal material source identical to the sediments from the Yangtze River valley. Sr–Nd isotopic values of the Xiashu loess match those from the northern margin of the Tibetan Plateau. Rare earth element ratios independent of grain size illustrate that the values from loess of the Yangtze River Delta mostly overlap with those of CLP loess. This feature implies that loess from the Yangtze River Delta has a dominant source of distant material similar as the CLP loess. As such, we conclude that multi-proxy analysis of sediments can shed new light on tracing the provenance of aeolian loess in the Yangtze River Delta.

关键词： Aeolian loess Provenance tracing Zircon U-Pb age Geochemistry Yangtze River Delta

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Exploring point zero:a study of 20 Chinese cities

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Geo-Spatial Information Science 2020年第3期23卷 258-272,I0006页

作者： Qi Zhou Mingjian Zhai Wenhao Yu School of geography and Information Engineering China University of GeosciencesWuhanChina

A point zero represents a central geographical location of a city,which is essential for not only measuring distances,but also understanding the historical and/or cultural origin of a *** extensive studies have focused on delineating city centers,to our knowledge,no studies have paid attention to determining the location for a point ***,our goal is to investigate various potential approaches for identifying such a ***,three typical approaches,geometric-based,topological-based,and thematic-based,are proposed to recommend point zeros and different scales,administrative divisions,kernel density sur-faces,and regions enclosed by ring roads are used for *** effectiveness of different approaches and scales are evaluated and compared by calculating an offset distance between recommended and actual point zero locations in 20 Chinese *** the different approaches,the average offset distance for most Chinese cities is 2-4 km,and the thematicbased approach performs *** the topological-based and thematic-based approaches are less sensitive to the analyzed scale than the geometric-based *** results indicate that it is possible to determine the approximate location for a point zero from geographical *** on the buffer zone of such a location,an actual point zero may further be recommended.

关键词： Point zero city center geographical data Chinese cities

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Spatial and Temporal Pattern of Urban Smart Development in China and Its Driving Mechanism

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Chinese Geographical Science 2018年第4期28卷 584-599页

作者： CHEN Xiaohong WEI Luyao ZHANG Haifeng College of geography Science of Harbin Normal University Harbin 150025 China department of geography & geosciences University of Louisville Louisville 40292 USA

Smart urban development is an inevitable choice, and is essential to overall strength improvement. It is important to explore an urban smart development path which unites smart growth with driving shrinkage perfectly in forming scientific and sustainable development concept and responding to new normal strategic opportunities. Based on statistic data of 294 prefecture-level cities and above in China from 2000 to 2015, we analyzed spatial and temporal evolution of urban smart development in China by constructing a dynamic fitting model of urban land expansion, population growth, and economic development as well as the coefficient of variation of urban smart development(CVSD). Further efforts were then made to consider differential distribution regularity of urban smart development so as to understand the driving mechanisms of heterogeneous classification of urban smart development in China from different scales and scale variation. Our results indicate that: 1) the disordered growth tendency of urban cities in China is overall well controlled in the middle, and late research and it mainly presented a doublet coexistence of shrinkage disordered cities and smart developing cities. It is particularly obvious that Northeast China and East China have regarded shrinkage disordered cities and smart developing cities as main development tendency separately. 2) Areas with basic stability and relative variation were relatively dispersed across the time period, but the proportion was far beyond areas with significant variation. It demonstrates a relative equilibrium spatial and temporal differential evolution pattern of prefecture-level cities and above in China, except for Tongling, Lanzhou and Chaoyang. 3) prefecture-level cities and above in China are mostly characterized by shrinkage disordered and smart development classification under the background of different scale and scale variation from 2000–2015; however, the spatial resonance relation is not obvious. 4) There are

关键词： urban smart development spatial and temporal differential pattern driving mechanism interaction factors China

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Dehydration Melting and Proterozoic Granite Petrogenesis in a Collisional Orogen——A Case from the Svecofennian of Southern Finland

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Journal of Earth Science 2021年第6期32卷 1289-1299页

作者： Tom Andersen O.Tapani Rämö department of geosciences University of OsloN-0316OsloNorway department of geosciences and geography Geology and Geophysics Research ProgramUniversity of Helsinki00014HelsinkiFinland

Dehydration melting of metasupracrustal rocks at mid-to deep-crustal levels can generate water undersaturated granitic *** this study,we evaluate the potential of~1.89–1.88 Ga metasupracrustal rocks of the Precambrian of southern Finland as source rocks for the 1.86–1.79 Ga late-orogenic leucogranites in the region,using the Rhyolite-MELTS *** close in composition to leucogranite is produced over a range of realistic pressures(5 to 8 kbar)and temperatures(800 to 850℃),at 20%–30%of partial melting,allowing separation of melt from unmelted *** solid residue is a dry,enderbitic to charnoenderbitic ganulite depleted in incompatible components,and will only yield further melt above 1000–1050℃,when rapidly increasing fractions of increasingly calcic(granodioritic to tonalitic)melts are *** solid residue after melt extraction is incapable of producing syenogranitic magmas similar to the Mid-Proterozoic,A-type rapakivi granites on further *** granitic fraction of the syenogranitic rapakivi complexes must thus have been formed by a different chain of processes,involving mantle-derived mafic melts and melts from crustal rock types not conditioned by the preceding late-orogenic Svecofennian anatexis.

关键词： leucogranite rapakivi granite anatexis restite depleted granulite Finland

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Hub-and-Spoke System in Air Transportation and Its Implications to Regional Economic Development——A Case Study of United States

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Chinese Geographical Science 2006年第3期16卷 211-216页

作者： SONG Wei MA Yanji department of geography ＆ geosciences University of Louisville Louisville KY 40292 USA Northeast Institute of geography and Agroecology Chinese Academy of Sciences Changchun 130012 China

Considerable changes have taken place in commercial passenger air transport since the enactment of the 1978 Airline Deregulation Act in the US and the deregulation of airline networks that has occurred elsewhere. The commercial and operational freedoms have led most of the larger carriers to develop hub-and-spoke networks, within which certain cities or metropolitan areas emerge as key nodes possessing tremendous advantages over other locations in the air transport system. This paper examines the nature of hub-and-spoke operations in air transportation services, and the benefits that accrue to a city or geographical region that is host to an airline hub. In particular, it looks into linkages between the air service hub and local economic development. Four potential types of impact of airports on the regional economy are defined and discussed. As an example, the assessment of the economic impacts of Cincinnati-Northern Kentucky International Airport (CVG), a major Delta Airlines hub, is introduced.

关键词： Hub-and-Spoke System air transportation regional economic development

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Deposition of Nutrients From Harmattan Dust in Ghana, West Africa

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Pedosphere 2015年第4期25卷 613-621页

作者： Henrik BREUNING-MADSEN Theodore Wola AWADZI Gry LYNGSIE Institute of geosciences and Natural Resource Management University of Copenhagen department of geography and Resource Development University of Ghana

In order to measure dust's nutrient input on farmland in different agro-ecological zones, Harmattan dust was sampled by mats with plastic straw in Ghana between 2002–2006. The inputs of total nutrients by Harmattan dust in Ghana per Harmattan period were about 1–2 kg Ca ha-1, 0.5–2 kg K ha-1, 0.5–1.5 kg Mg ha-1and less than 0.5 kg P ha-1. Compared with the annual input of nutrients by precipitation, the dust accounted for 10% or less of Ca, Mg and K but approximately 20%–40% of P. The input of nutrients by dust was only valid for areas with vegetation, because in areas with none or sparse vegetation, loss of soil due to wind erosion and hereby loss of nutrients might be significant. In farmland areas with bare and vegetated fields there seemed to be an internal redistribution of the nutrients and not a net gain of nutrients from outside the area(long-range transported dust). The input of P by dust might be of some importance in the traditional shifting cultivation systems, while the inputs of other three nutrients of Ca, Mg and K were so low that they must be considered insignificant. In the intensive agriculture systems with huge inputs of manures and fertilizers the nutrient input by dust is insignificant and could be neglected.

关键词： deposition rate dust deposition input of nutrient long-range transported dust nutrient concentration traditionalagricultural system

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Untangling the increasing elevation of cropland in China from 1980 to 2020

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geography and Sustainability 2023年第4期4卷 281-293页

作者： Wanxu Chen Liyan Yang Jie Zeng Jintao Yuan Tianci Gu Zhiling Liu department of geography School of Geography and Information EngineeringChina University of GeosciencesWuhan 430078China School of Public Administration China University of GeosciencesWuhan 430074China

The redistribution of cropland to areas of higher elevation in China has long affected agricultural development and could seriously threaten national food ***,there is currently little research reported on this phenomenon,which may limit the improvement of cropland protection *** fill this gap,we analyzed the spatiotemporal characteristics and driving mechanisms of increased cropland elevation in China during the period *** average cropland elevation in China increased by 17.38 m from 1980 to *** gravity center of the cropland area and average cropland elevation in China moved to the northwest by 81.00 km and 51.47 km,*** amount of newly added cropland in eastern China was less than that in occupied regions;however,the average elevation of newly added cropland was greater than that of occupied cropland,though the opposite phenomenon was observed in western ***,temperature,land-use intensity,population,economic density,and distance to main roads were the main factors affecting the redistribution of cropland to areas of higher *** effects of these major driving factors exhibited significant spatial and temporal variations in *** study has important implications for improving existing cropland protection policies and developing more effective cropland management systems in China.

关键词： Cropland Elevation Geodetector Geographically weighted regression Spatial analysis China

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用于SARS-CoV-2 N蛋白超灵敏检测的增强型长余辉发光纳米棒（英文）

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Science China Materials 2025年第1期 253-260页

作者：魏忆宋梦麟李丽华马颖瑾老欣悦刘源李国岗郝建华 department of Applied Physics The Hong Kong Polytechnic University Faculty of Materials Science and Chemistry China University of Geosciences department of Gastrointestinal Surgery The Third Affiliated Hospital of Sun Yat-sen University

长余辉发光纳米材料关闭光源仍能保持发光,由于其能够完全消除自发组织荧光,在生物传感和生物成像领域展示了潜在应用前景.尽管长余辉发光材料已经取得了较大的进展,但仍缺少具有低检测限和高灵敏度的长余辉检测平台.基于此,本文开发了...

长余辉发光纳米材料关闭光源仍能保持发光,由于其能够完全消除自发组织荧光,在生物传感和生物成像领域展示了潜在应用前景.尽管长余辉发光材料已经取得了较大的进展,但仍缺少具有低检测限和高灵敏度的长余辉检测平台.基于此,本文开发了具有优异长余辉和超长余辉时间的Zn2GeO4:Mn,Cr纳米棒.通过创建深缺陷, Cr3+的共掺杂明显提高了余辉强度和余辉时间.将Zn2GeO4:Mn,Cr-抗体和Fe3O4磁性纳米粒子-抗体构建成生物传感器,用于N蛋白检测.获得的检测限可低至39.82 ag/mL,远低于之前报道的长余辉发光生物传感器,这归因于荧光共振能量传递.此外,构建的长余辉生物传感器还实现了高检测特异性.因此,所制备的Zn2GeO4:Mn,Cr长余辉发光材料可作为生物传感器的候选材料.该策略为开发具有高灵敏度和特异性的生物传感平台提供了有效的指导.

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A methodological framework for analyzing PPGIS data collected in 3D

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International Journal of Digital Earth 2023年第1期16卷 3435-3455页

作者： Kamyar Hasanzadeh Nora Fagerholm Hans Skov-Petersen Anton Stahl Olafsson department of geography and Geology University of TurkuTurkuFinland department of geosciences and Natural Resource Management University of CopenhagenCopenhagenDenmark

Public participation geographic information system(PPGIS)is a facilitated Volunteered Geographic Information approach and data collection method that aims to capture the spatial experiences of *** we experience the space around us three-dimensionally,altitude,as the third dimension,has been often absent from PPGis research and *** is largely because of the complexity of implementing surveys in 3D but can also be attributed to a lack of analytical preparedness for using such *** study complements 3D PPGIS data collected from a pilot study of the Aninkainen block in Turku,Finland with synthetic,*** manufactured,data to propose an analytical framework for the study of 3D PPGIS *** analytical framework divides methods based on the geographical scale into two groups:micro-and macro-scale *** this framework,we propose the use of geospatial metrics to analyze 3D PPGIS *** argue that while this multidisciplinary area of research is in its infancy,use of intuitive 3D adapted geometric and landscape metrics can help overcome some of complexities associated with use of this emerging participatory *** conclude by outlining the limitations and envisioning areas for future research.

关键词： 3D GIS landscape metrics PPGIS

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