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Interaction between urbanization and eco-environment in the Tibetan Plateau

Journal of Geographical Sciences 2021年第2期31卷 298-324页

作者： FENG Yuxue li guangdong Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

A scientific evaluation of the broad reciprocal influences between urbanization and the eco-environment in the Tibetan Plateau region is of great significance for increasing the speed and quality of urbanization as well as restoring and improving the *** on a thorough look at the progress made by research on interactions between urbanization and the eco-environment in the Tibetan Plateau region,this article attempts to construct a complete analytical model of the reciprocal influences that can achieve the whole process of analyzing evaluation indexes,quantifying coupling coordination,identifying coupling types,exploring decoupling paths,and predicting future *** multi-scale analysis of the Tibetan Plateau and its provinces and prefecture-level units as a means of comparison,we attempt to clarify differences at different scales,identify problem areas and propose targeted improvement *** result shows that the urbanization evaluation indexes for the Tibetan Plateau at different scales rise in stages and that the urbanization index for Qinghai is higher than for Tibet;the changes in the eco-environment index of the two regions are also different,with a downward trend in Qinghai and a trend toward stability in Tibet,and with stratification in the eco-environment indexes of prefecture-level units;the degree of coupling coordination between urbanization and the eco-environment at different scales in the Tibetan Plateau region is increasing overall,with the type of coordination changing from uncoordinated deterioration to borderline uncoordinated deterioration,and ultimately changing into scarcely coordinated development,which basically puts the region into the logging urbanization category;and the urbanization and eco-environment indexes display a dynamic trend of alternating between strong decoupling and weak decoupling,indicating that there is a negative reciprocal influence between urbanization and eco-environment at different scales

关键词： urbanization eco-environment coupling coordination degree decoupling prediction Tibetan Plateau

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Driving Mechanism of Cultivated Land Transition in Yantai Proper,Shandong Province,China

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Chinese Geographical Science 2015年第3期25卷 337-349页

作者： QIN Weishan ZHANG Yifeng li guangdong Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Geography and Planning School of Ludong University

Cultivated land transition and its driving mechanism are the hotspots among studies on land use change. In this study, we constructed a framework to study the driving mechanism of cultivated land transition from the quantitative perspective. Based on the vector data of land use in 1990, 2000 and 2009 of Yantai Proper, Shandong Province China, 11 explanatory variables were chosen from two aspects: the elevation, slope, cost distance to major water area and cost distance to minor water area, which presented physical factors; cost distance to district center, cost distance to town center, cost distance to city expansion center, cost distance to major roads, cost distance to city roads, cost distance to county roads and cost distance to rural roads, which presented the socio-economic factors. Combined with spatial analysis tools and Logistic regression analysis model, we construct Logistic regression analyses with four objectives that were urban construction land, rural residential land, orchard and other lands. The results show that, cost distance to district center, cost distance to town center, cost distance to city expansion center and cost distance to city roads are the significant explanatory variables for the transition of cultivated land into urban construction land. The main explained factors on the transition of cultivated land into rural residential land are slope, cost distance to town center, cost distance to county roads and cost distance to rural roads. Slope, cost distance to minor water area, cost distance to town center, cost distance to county roads and cost distance to rural roads are the significant explanatory variables for the transition of cultivated land into orchard land. Elevation, slope, cost distance to major water area and cost distance to minor water area are the main explanatory variables on the transition of cultivated land into other land uses.

关键词： cultivated land use transition driving mechanism Yantai Proper China

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Evaluation of Three-dimensional Urban Expansion: A Case Study of Yangzhou City, Jiangsu Province, China

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Chinese Geographical Science 2015年第2期25卷 224-236页

作者： QIN Jing FANG Chuanglin WANG Yang li guangdong WANG Shaojian Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences Guangzhou Institute of Geography

With rapid urban development in China in the last two decades, the three-dimensional(3D) characteristic has been the main feature of urban morphology. However, the vast majority of researches of urban growth have focused on the planar area(two-dimensional(2D)) expansion. Few studies have been conducted from a 3D perspective. In this paper, the 3D urban expansion of the Yangzhou City, Jiangsu Province, China from 2003 to 2012 was evaluated based on Geographical Information System(GIS) tools and high-resolution remote sensing images. Four indices, namely weighted average height of buildings, volume of buildings, 3D expansion intensity and 3D fractal dimension are used to quantify the 3D urban expansion. The weighted average height of buildings and the volume of buildings are used to illustrate the temporal change of the 3D urban morphology, while the other two indices are used to calculate the expansion intensity and the fractal dimension of the 3D urban morphology. The results show that the spatial distribution of the high-rise buildings in Yangzhou has significantly spread and the utilization of the 3D space of Yangzhou has become more efficient and intensive. The methods proposed in this paper laid a foundation for a wide range of study of 3D urban morphology changes.

关键词： three-dimensional urban morphology high-resolution remote sensing image three-dimensional expansion three-dimen-sional fractal Yangzhou City China

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Fluorination Intensifying Oxygen Evolution Reaction for High-Temperature Steam Electrolysis

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Energy Material Advances 2023年第1期4卷 210-219页

作者： guangdong li Yunjie Gou Rongzheng Ren Chunming Xu Jinshuo Qiao Wang Sun Zhenhua Wang Kening Sun Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijingPeople's Republic of China

Solid oxide electrolysis cells(SOECs)have emerged as one of the most potent techniques for hydrogen *** the restricted step for SOEC,as well as the most predominant obstacle to the scaled application,oxygen evolution reaction(OER)should be urgently accelerated by developing potent *** inferior electrochemical activity to cobalt-based materials,perovskite ferrites exhibit great potential in the future with regard to good intrinsic stability and durability,abundant reserves,and good compatibility with other SOEC *** this work,fluorination is introduced to the typical perovskite ferrite to further intensify the OER *** initio calculations combined with physical-chemical characterizations are performed to reveal the *** doped F^(−)leads to debilitating the strength of the metal-oxygen bond and then reduces the energy for oxygen vacancy formation and ion migration,which renders improvements to sub-processes of OER on the *** well-verified material,PrBaFe_(2)O_(5+δ)F_(0.1)(PBFOF),exhibited a low polarization resistance of 0.058Ωcm^(-2).Single cells based on PBFOF showed a high current density of 2.28 A cm^(-2) at 750°C under 1.3 *** work provides a clear insight into the mechanism of fluorination on perovskites and high-activity anode material for SOEC.

关键词： perovskite Oxygen durability

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Autophagy receptor ZmNBR1 promotes the autophagic degradation of ZmBRI1a and enhances drought tolerance in maize

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Journal of Integrative Plant Biology 2024年第6期66卷 1068-1086页

作者： Yang Xiang guangdong li Qian li Yingxue Niu Yitian Pan Yuan Cheng Xiangli Bian Chongyang Zhao Yuanhong Wang Aying Zhang College of life Sciences Nanjing Agricultural UniversityNanjing210095 China State Key Laboratory of Crop Genetics&Germplasm Enhancement and Utilization Nanjing Agricultural UniversityNanjing210095 China Sanya Institute of Nanjing Agricultural University Nanjing Agricultural UniversitySanya572025 China

Drought stress is a crucial environmental factor that limits plant growth,development,and *** of misfolded proteins can help alleviate the damage caused in plants experiencing ***,the mechanism of autophagy-mediated drought tolerance in plants remains largely ***,we cloned the gene for a maize(Zea mays)selective autophagy receptor,NEXT TO BRCA1GENE 1(ZmNBR1),and identified its role in the response to drought *** observed that drought stress increased the accumulation of *** sequencing and reverse transcriptionquantitative polymerase chain reaction showed that ZmNBR1 is markedly induced by drought ***1 overexpression enhanced drought tolerance,while its knockdown reduced drought tolerance in *** results established that ZmNBR1 mediates the increase in autophagosomes and autophagic activity under drought ***1 also affects the expression of genes related to autophagy under drought ***,we determined that BRASSINOSTEROID INSENSITIVE1A(ZmBRI1a),a brassinosteroid receptor of the BRI1-like family,interacts with *** analysis showed that ZmBRI1a negatively regulates drought tolerance in maize,and genetic analysis indicated that ZmNBR1 acts upstream of ZmBRI1a in regulating drought ***,ZmNBR1facilitates the autophagic degradation of ZmBRI1a under drought *** together,our results reveal that ZmNBR1 regulates the expression of autophagy-related genes,thereby increasing autophagic activity and promoting the autophagic degradation of ZmBRI1a under drought stress,thus enhancing drought tolerance in *** findings provide new insights into the autophagy degradation of brassinosteroid signaling components by the autophagy receptor NBR1 under drought stress.

关键词： autophagy receptor drought tolerance Zea mays ZmBRI1a ZmNBR1

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A　Genetic　Algorithm　for　Routing　in　Packet-Switched　Communication　Networks

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通信学报 1997年第3期18卷 44-53页

作者： He Cuihong Ou Yishan li Xianji (guangdong Institute of Technology,Guangzhou 510090) 广东工业大学广东广州 510090 广东工业大学广东广州

ＡＧｅｎｅｔｉｃＡｌｇｏｒｉｔｈｍｆｏｒＲｏｕｔｉｎｇｉｎＰａｃｋｅｔ┐ＳｗｉｔｃｈｅｄＣｏｍｍｕｎｉｃａｔｉｏｎＮｅｔｗｏｒｋｓＨｅＣｕｉｈｏｎｇＯｕＹｉｓｈａｎＬｉＸｉａｎｊｉ（ＧｕａｎｇｄｏｎｇＩｎｓｔｉｔｕｔ... 详细信息

ＡＧｅｎｅｔｉｃＡｌｇｏｒｉｔｈｍｆｏｒＲｏｕｔｉｎｇｉｎＰａｃｋｅｔ┐ＳｗｉｔｃｈｅｄＣｏｍｍｕｎｉｃａｔｉｏｎＮｅｔｗｏｒｋｓＨｅＣｕｉｈｏｎｇＯｕＹｉｓｈａｎＬｉＸｉａｎｊｉ（ＧｕａｎｇｄｏｎｇＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，Ｇｕａ...

关键词：包交换通信网络路由算法遗传算法

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Design and simulation investigations on charge transport layers‑free in lead‑free three absorber layer all‑perovskite solar cells

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Frontiers of Optoelectronics 2024年第2期17卷 69-85页

作者： guangdong li Mingxiang Xu Zhong Chen School of Physics Southeast UniversityNanjing 211189China

The multiple absorber layer perovskite solar cells(PSCs)with charge transport layers-free(CTLs-free)have drawn widespread research interest due to their simplified architecture and promising photoelectric *** the circumstances,the novel design of CTLs-free inversion PSCs with stable and nontoxic three absorber layers(triple Cs_(3)Bi_(2)I_(9),single MASnI_(3),double Cs_(2)TiBr_(6))as optical-harvester has been numerically simulated by utilizing wxAMPS simulation software and achieved high power conversion efficiency(PCE)of 14.8834%.This is owing to the innovative architecture of PSCs favors efficient transport and extraction of more holes and the slender band gap MASnI_(3)extends the absorption spectrum to the near-infrared periphery compared with the two absorber layers architecture of ***,the performance of the device with p-type-Cs_(3)Bi_(2)I_(9)/p-type-MASnI_(3)/n-type-Cs_(2)TiBr_(6)architecture is superior to the one with the p-type-Cs_(3)Bi_(2)I_(9)/ntype-MASnI_(3)/n-type-Cs_(2)TiBr_(6)architecture due to less carrier recombination and higher carrier life time inside the absorber *** simulation results reveal that Cs_(2)TiF_(6)double perovskite material stands out as the best ***,an excellent PCE of 21.4530%can be obtained with the thicker MASnI_(3)absorber layer thickness(0.4μm).Lastly,the highestperformance photovoltaic devices(28.6193%)can be created with the optimized perovskite doping density of around E15 cm^(3)(Cs_(3)Bi_(2)I_(9)),E18 cm^(3)(MASnI_(3)),and 1.5E19 cm^(3)(Cs_(2)TiBr_(6)).This work manifests that the proposed CTLs-free PSCs with multi-absorber layers shall be a relevant reference for forward applications in electro-optical and optoelectronic devices.

关键词： Multiple absorber layer PSCs CTLS-free·Inverted Narrow-band gap Simulation

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Quantitative measuring and influencing mechanism of urban and rural land intensive use in ChinaQuantitative measuring and influencing mechanism of urban and rural land intensive use in China

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Journal of Geographical Sciences 2014年第5期24卷 858-874页

作者： li guangdong FANG Chuanglin PANG Bo Institute of Geographic Science and Natural Resources Research CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Land use issue is an important constraining force to limit economic sustainable development of China. Urban and rural rapid expansion depletes valued land resources under the background of rapid urbanization. An extensive use pattern might cause a serious waste of land resources. The study on influencing mechanism of land intensive use （liU） in China at the county level is a key tool for effective liU practice and policy-making. This paper uses OLS model, Spatial Panel Lagged model and Spatial Panel Error model to quantitatively analyze the influencing mechanisms of five class factors and 17 variables supported by GIS （Geographic Information System） and MATLAB. And a comprehensive data set was devel- oped including physical geography and socio-economic information of 2286 counties. Meanwhile, the spatiotemporal pattern of liU has discussed by means of GIS. The results show that Spatial Panel Data models are slightly superior to OLS model in terms of signifi- cance and confidence level. Regression results of these models indicate that industrialization, urbanization, economic development level, location, transportation and policy have significant impact on liU of counties. The variables of physical geography are less significant than socio-economic variables. An ignored variable of historical factor, however, became the best significant factor. In the future, the liU at the county level should take advantage of the new situation by enhancing favorable factors and reducing disadvantageous ones, which can be acquired by improving the entire level and quality of industrialization and urbanization. We argued that an efficient and complete land market and operating system should be built to reflect market-oriented activities at the first place, then, differential liU regulation policies and measurements should be optimized according to regional differences. In the meantime, we should pay close attention to the carrying capacity of local resources and environments when con

关键词： land intensive use national territory quantitative measure influencing mechanism influencing factors spatial econometrics models GIS county China

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International progress and evaluation on interactive coupling effects between urbanization and the eco-environment

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Journal of Geographical Sciences 2016年第8期26卷 1081-1116页

作者： FANG Chuanglin liU Haimeng li guangdong Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Xinjiang Universityl Urumqi 830046 China University of Chinese Academy of Sciences Beijing 100049 China

Global urbanization is exerting severe stress and having far-reaching impacts on the eco-environment, and yet there exists a complex non-linear coupling relationship between the two. Research on the interactive coupling effect between urbanization and the eco-environment will be a popular area of study and frontier in international earth system science and sustainability science in the next 10 years, while also being a high-priority research topic of particular interest to international organizations. This paper systematically collates and summarizes the international progress made in research on interactive coupling theory, coupling relationships, coupling mechanisms, coupling laws, coupling thresholds, coupling models and coupling optimization decision support systems. The research shows that urbanization and eco-environment interactive coupling theories include the Kuznets curve theory, telecoupling theory, planetary boundaries theory, footprint family theory and urban metabolism theory; most research on interactive coupling relationships is concerned with single- element coupling relationships, such as those between urbanization and water, land, atmosphere, climate change, ecosystems and biodiversity; the majority of research on interactive coupling mechanisms and laws focuses on five research paradigms, including coupled human and nature systems, complex social-ecological systems, urban ecosystems, social-economic-natural complex ecosystems, and urbanization development and eco-environment constraint ring; the majority of interactive coupling simulations use STIRPAT models, coupling degree models, multi-agent system models and big data urban computer models; and research has been carried out on urbanization and eco-environment coupling thresholds, coercing risk and optimal decision support systems. An objective evaluation of progress in international research on interactive coupling between urbanization and the eco-environment suggests that there are six main r

关键词： urbanization eco-environment interactive coupling effect international progress overall evaluation and prospects

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全球土地覆被时空变化与中国贡献

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地理学报 2022年第2期77卷 353-368页

作者：李广东中国科学院地理科学与资源研究所中国科学院区域可持续发展分析与模拟院重点实验室北京100101 中国科学院大学资源与环境学院北京100049

20世纪下半叶以来全球土地覆被发生了剧烈变化,人类活动对土地覆被变化的影响成为"人类世"最为显著的特征之一。科学评估全球土地覆被变化的时空过程和新态势,分析中国在其中扮演的角色和地位并提出优化路径,成为中国在可持续发展领域... 详细信息

20世纪下半叶以来全球土地覆被发生了剧烈变化,人类活动对土地覆被变化的影响成为"人类世"最为显著的特征之一。科学评估全球土地覆被变化的时空过程和新态势,分析中国在其中扮演的角色和地位并提出优化路径,成为中国在可持续发展领域应对全球百年未有之大变局的核心任务之一。本文基于多源土地覆盖数据,运用地理空间分析方法定量刻画了全球土地覆被变化的时空演化过程,从景观尺度分析了地类间的转化关系以及全球"变绿"和森林覆盖度的变化趋势,揭示了中国对全球土地覆被时空变化的贡献。结果表明,1992—2015年全球土地覆被经历了显著变化,全球土地覆被变化度在南美洲中部、撒哈拉以南的非洲、中亚、东南亚和东亚等地形成显著的热点区。中国森林覆盖率从1990年的12.98%增至2020年的23.34%,湿地面积增长1908 km^(2),为维护全球生态安全贡献了力量,同时在城市用地增长、草地和其他用地减少等方面也有一定的限制作用。与全球其他国家不同,中国城市扩张占用耕地面积居全球第一位,高达7.3万km^(2)。1999—2019年全球叶面积指数存在全球性的显著提高趋势。中国以仅占全球6.6%的植被面积,贡献了全球20%左右的叶面积增加量,引领了全球"变绿"过程。1990—2020年全球森林覆盖度变化呈现出空间集聚性。中国森林面积增长62.84万km^(2)居全球前列,其中西南林区和秦巴山区是林地增长的主要区域,长三角、粤港澳大湾区和内蒙古东部部分地区是森林覆盖度降低的主要区域。中国未来应进一步提升经济社会发展与生态保护的均衡协调度,持续推进美丽中国建设,为全球生态安全和可持续发展贡献更大力量和更多经验。

关键词：土地覆被变化叶面积指数森林全球中国

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