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1.
since 1978, rural urbanization has been accelerated in the Zhujiang (Pearl) River Delta because of the rapid development of commodity agriculture, industrialization and tertiary industry. Its natural urban population increase had been mostly mechanical before now, and the towns have been transformed from traditional centers into those serving various functions, particularly industrial ones.In the Zhujiang River Delta, population density and the level of economic changes are high in central areas, and low in outlying area, but on the other hand, urban population has increased slowly in central area and fast in outlying area. In the central areas more industrial towns emerge. So the gap has been greatly reduced. The reform of the construction of the region's economy, the improvement of transportation, the adjustment of the standard of town setting have promoted the distribution of the towns in the Zhujiang River Delta from being centralized to balanced.  相似文献   

2.
1INTRODUCTIONIt is one of important issues in the field of geographical science to analyze the spatial differentiation of regional phenomenon. The research on spatial differentiation can be cast back to Thunen's agricultural location theory. Af- terwards, many scholars developed the theory and paid moreattentiontothelawandformingmechanismofspa- tial differentiation of some phenomena including inhabi- tation structure, population variation, environmental ele- ments, rural development, and …  相似文献   

3.
In this paper, Shunde City is selected as a typical region standing for the Zhujiang Delta because of its excellent location and dike-pond system. There are three main characters of agricultural land use in this region. First, the most typical land use form is dike-pond system. It is a special form of artificial ecosystem of land-water interaction. Second, sandy field is also an important land type in this region. Third, land use is greatly influenced by export-oriented economy. Recently, with economic reforming and the opening up of the Zhujiang Delta, the structure of agricultural land use has been changed greatly. The area of mulberry dike has decreased and a variety of planting crops has increased. Various structure of dike-pond farming has emerged in the Zhujiang Delta such as “fruit dike-fish pond”, “flower dike-fish pond”, “grass dike-fish pond”, “vegetable dike-fish pond”. The area of water has slightly increased and its development tends to modernization due to the use of modern equipment and advanced breeding ways. The area for “three high” (high yield, high quality and high efficiency) agriculture has increased greatly.  相似文献   

4.
THECHARACTERANDCHANGETENDENCYOFAGRICULTURALLANDUSEINTHEZHUJIANGDELTA-ACASESTUDYOFSHUNDECITYZhangLuocheng(张落成)(NanjingInstitut...  相似文献   

5.
城市的快速扩张不断改变着土地资源的转化,带来了诸多生态环境问题。分析和模拟城市扩张的机制,并对城市未来土地利用变化的风险进行预警,利于合理调控城市的发展。本文提出了一种基于地理分区和未来用地模拟(Future Land Use Simulation,FLUS)模型的城市扩张模拟模型,用于模拟和预测复杂的土地利用变化。该模型利用多指标数据进行空间聚类,耦合地理分区结果进行城市扩张模拟。珠江三角洲2005-2015年的城市扩张模拟结果显示,分区下的模拟精度(FoM=0.2329,提高了9%)明显高于未分区,说明不同分区在土地利用转化上存在空间差异,该模型能更有效地模拟城市土地利用变化。另外,本文构建了一种城市扩张预警指标评价体系,用于评估城市扩张的警情。根据在2005-2015基础上预测的2025-2045年土地利用变化结果,对珠江三角洲城市扩张进行多尺度预警分析。综合预警结果显示该区域大部分城市至2045年城市扩张警情将达到中警和重警,其中东莞警情一直维持在重警。由此,未来需要加强对珠三角城市扩张的宏观调控,以此来缓解未来城市扩张的警情。  相似文献   

6.
(翁齐浩)THERELATIONSHIPBETWEENTHEENVIRONMENTALCHANGEOFTHEZHUJIANGRIVERDELTAINHOLOCENEANDITSCULTURALORIGINSANDPROPAGATION¥WengQih...  相似文献   

7.
黄河三角洲人类干扰活动强度变化及其景观格局响应   总被引:1,自引:0,他引:1  
本研究以湿地变化较为剧烈的黄河三角洲为研究对象,基于RS技术和GIS空间分析方法,利用人为干扰度模型,结合区域人工沟渠建设情况,从区域和局地两个尺度直观揭示人类干扰强度时空分异特征,并探究区域景观格局对人类干扰活动的响应,以期为黄河三角洲滨海湿地生态保护与人类活动调控提供决策支持。结果表明:① 1995-2015年现代黄河三角洲区域人为干扰度和人工沟渠密度均明显增加,空间分布呈现从西南部向东部、北部,自内陆向沿海的扩展趋势;② 随着人类活动强度增强,研究区自然湿地面积减少,区域景观多样性和空间异质性增加,景观整体连通性减弱,景观复杂性降低;③ 景观格局对人类干扰强度变化的响应关系呈现出地区和时间差异;人类干扰活动强度相对较低的保护区受人工沟渠建设的影响,也呈现出斑块团聚程度降低、景观多样性增加和景观复杂性降低的变化趋势;④ 人为干扰度指数和人工沟渠密度指标互为补充,互相印证,可以较为全面、客观地反映黄河三角洲地区人类干扰活动强度。  相似文献   

8.
黄河三角洲具有独特的地理区位,黄河三角洲高效生态经济区规划上升为国家战略后,黄河三角洲高效生态经济区(以下简称黄三角)的开发与建设引起社会广泛的关注,土地利用结构调整与优化也成为新常态下具有重要意义的课题。该文探讨了黄三角地区土地资源利用结构的特点,分析了土地利用中存在的结构性问题,探索了土地利用结构调整、优化、升级趋势和方向,提出了土地利用结构调整中应该注意的问题,为发挥区域土地资源优势,促进黄三角经济社会又好又快发展提供一定的借鉴。  相似文献   

9.
From the ecological viewpoint this paper discusses the urban spatial-temporal relationship.We take regional towns and cities as a complex man-land system of urban eco-community,This complex man-land system comprises two elements of “man“ and “land“,Here,“man“ means organization with self-determined consciousness,and “land“ means the physical environment (niche ) that “man “depends on .The complex man-land system has three basic components,They are individual,population and community,Therefore there are six types of spatial relationship for the complex man-land system.They are individual,population,community,man-man,land-land and man-land spatial realtionships,Taking the Pearl(Zhujiang) River Delta as a case study,the authors found some evidence of the urban spatial relationship from the remote sensing data,Firstly,the concentration and diffusion of the cities spatial relationship was found in the remote sensing imagery,Most of the cities concentrate in the core area of the Pearl River Delta ,but the diffusion situation is also significant ,Secondly,the growth behavior and succession behavior of the urban spatial relationship was found in the remote sensing images comparison with different temporal data ,Thirdly,the inheritance,break ,or meeting emergency behavior was observed from the remoted sensing data.Fourthly,the authors found many cases of symbiosis and competi-tion in the remote sensing data of the Pearl River Delta ,Fifthly,The autoeciousness,stranglehold and invasion behavior of the urban spatial relationship was discovered from the remote sensing data.  相似文献   

10.
黄河三角洲油田集中区土地利用演化的遥感分析   总被引:6,自引:0,他引:6  
本文利用多时相的 TM卫星影像及相关资料 ,圈定油田集中区 ,并提取其土地利用要素 ;就 1984~ 1999年15年来 ,黄河三角洲油田集中区内土地利用变化进行分析。结果表明 ,油田集中区是处于生态极其脆弱的地带 ,土地利用类型变化比较快 ,变化的面积所占的比例相对较大。  相似文献   

11.
黄河三角洲土地生产潜力的GIS评价   总被引:8,自引:0,他引:8  
黄河三角洲可持续发展信息系统数据库的支持下,以黄河三角洲为实验区,考虑影响土地生产力水平的多种因素,确定合理的数学模型,进行土地景观单元的土地生产潜力定量化评价计算。同时,分析了黄河三角洲土地生产潜力的数值分布和空间分布特征以及分级统计和制图,并提出了提高黄河三角洲土地生产潜力的相应建议。  相似文献   

12.
长江三角洲城市化地区植被初级生产力的时空变化研究   总被引:1,自引:0,他引:1  
城市化过程对植被初级生产具有重要影响。以往研究主要集中于城市用地扩张对植被初级生产力的直接影响分析,而较少关注其间接效果。本文以长江三角洲地区为例,分别从地区尺度和城市尺度分别分析了2000-2013年植被初级生产力的时空变化,探讨了其与气温、降水量及城市建成区绿化覆盖率的关系。研究表明:地区尺度上,2000-2013年长江三角洲植被初级生产力呈现不断增加,其中城市建成区植被初级生产力呈现显著增加的趋势(P<0.05);城市尺度上,城市建成区内植被初级生产力主要呈现增加的趋势,而其外围缓冲区内则与此相反。在当前气候变化背景下,这可能与城市建成区绿化覆盖率不断增加,及快速的城市扩张有关。  相似文献   

13.
黄河三角洲具有极高的生态价值,研究其景观格局及生态风险对促进黄河三角洲高质量发展具有重要意义。本文以黄河三角洲1980年、2000年和2020年土地利用数据为基础,分析土地转移及景观格局特征,同时构建生态风险评价模型揭示生态风险时空演变及空间相关性。结果表明:(1)耕地是黄河三角洲最主要的地类,占比在60%以上,1980—2020年土地转移主要发生在耕地、建设用地、水域和未利用地之间。(2)1980—2020年黄河三角洲景观斑块数、景观斑块密度、景观最大斑块指数、景观形状指数和香农多样性指数均呈下降趋势,区域整体趋向简单化和聚集化。(3)黄河三角洲高风险区和较高风险区主要环渤海分布,1980—2020年各级风险区转出最大面积均为更低级风险区,生态风险有所降低。  相似文献   

14.
Since China opening to outside world, the economy in the Pearl(Zhujiang) River Delta(PRD) has been dou-ble digit growth. It has been known as one of mature fast growth areas in the world and become the model and hope of Chi-nese reform and opening to outside world. The regional development in PRD is the outcome of polarization effects. The polar-ization effects actually are extension of international regional division and a combination of Hongkong‘‘s influence and re-form and open-door policies on the mainland. Since the 1990s, driven by knowledge-based economy, the PRD has furtheradjusted the industrial structure and achieved good progress in upgrading industrial structure. Its high technology industryhas developed quickly and the economic internationalization has deepened, meanwhile, the region is going through transforma-tion and some new trends have begun to appear, which include: university towns springing up, industrial globalization andthe construction of Hi-tech development zones. The paper suggests that with the economic growth changing from relying onthe low level production elements to relying on high level production elements, the regional policies in GuangdongProvince should develop correspondingly: 1) make a plan to prohihite the blind construction in innovative spatial construc-tions; 2) make measures to attract the overseas talents to establish a pool of talent; 3) work out the favorable policies forabsorbing larger capital; 4) formulate the policy of attracting a cluster of industries to speed up the upgrade of industrialdevelopment.  相似文献   

15.
The spatial distribution of meteorological elements is important for understanding the regional meteorology and climate changes. However, previous studies rarely focused on the daily changes of the spatial patterns of meteorological elements due to the limitation of remote sensing (RS) techniques and traditional meteorological methods. In this paper, the regional meteorological elements were simulated by the fifth-generation non-hydrostatic Mesoscale Model (MM5), and the spatial patterns of meteorological elements and their diurnal variations were analyzed in landscape level over the Pearl (Zhujiang) River Delta (PRD), China. The results showed that there were several centers of urban heat islands, cold islands, dry islands, wet islands, high wind over the PRD at noon. The diurnal changes of Moran I of meteorological elements were obvious and they reached the extremum at noon and 2-3 hours after the sunrise. The landscape indices of meteorological elements, such as area-weighted mean Fractal Dimension Index (FRAC_AM), Landscape Shape Index (LSI), Shannon's Diversity Index (SHDI) and Contagion Index (CONTAG), were more variable at about the sunrise, noon and sunset. The occurrence of wave crests and vales of landscape indices was affected by the surface net radiation, turbulence and local circumfluence. The spatial patterns of meteorological elements correlated well with the land surface, thermal exchanges and local circumfluence. A new approach combining GIS, RS and numerical simulatious technologies and the landscape ecology method was presented to analyze spatial patterns of meteorological elements, which may be useful for studying global and regional climate changes.  相似文献   

16.
通过拟合最优幂函数模型,将NPP-VIIRS影像模拟为DMSP-OLS影像,构建了京津冀、长江三角洲(简称长三角)和珠江三角洲(简称珠三角)三大城市群1992—2017年长时间序列夜间灯光影像集。参考城市建成区统计数据确定夜间灯光最佳阈值提取城市范围,有效剥离统计数据中包含的经济活力不足的城市空间,识别出不属于统计范围的低等级、高活力城镇区,创新了数据应用视角。研究表明:① 县级城镇和市级以上城市对三大城市群城市范围的贡献度不同。京津冀腹地广阔,县级城镇是区域经济活力的重要组成部分,整体上贡献度最大;1990s初期长三角部分县级城镇经济活力较强,大量撤县设市后县级城镇数量减少,逐渐在2005年后低于京津冀;珠三角受到社会经济发展条件和行政单元划分的影响,县级城镇对城市范围的贡献在3个城市群中始终最小。② 三大城市群城市扩展非均衡性特征存在差异。京津冀城市扩展为京、津主导下的“双核”模式,非均衡性显著,尚未形成完善的城市规模体系;长三角和珠三角城市集聚特征明显,均衡性更强。重心迁移的路径、方向和距离反映各城市群不同的扩展强度和作用模式。③ 城市空间扩展格局整体均呈现热点区不断扩大、冷点区不断缩小的特征。其中京津冀热点和冷点区相对稳定,热点区向心集聚作用较强;长三角和珠三角空间格局变化较大,区域核心城市带动作用较强。  相似文献   

17.
长江三角洲地区制造业集群辨识及空间组织特征   总被引:1,自引:0,他引:1  
本文基于投入产出表的主成分分析和企业空间分布数据的聚类分析,从产业功能联系和空间联系角度辨识长江三角洲地区主要的制造业集群,并从企业、产业、区域3个维度刻画和比较不同类型制造业集群的空间组织特征。研究表明,长江三角洲地区存在冶金及装备、电子信息、纺织及服装等12个垂直联系紧密的制造业群组,并高度集聚于沿沪宁线、沪杭线、杭甬线的“Z”字形区域。冶金及装备、电子信息和纺织及服装3个制造集群分别呈现轮辐式、卫星式和马歇尔式产业集群组织方式。上海和江苏的制造业集群在集群规模、大型企业占比、外资企业占比等方面,要明显高于浙江的制造业集群。  相似文献   

18.
黄河三角洲湿地景观格局动态变化分析   总被引:23,自引:3,他引:20  
在RS和GIS技术的支持下,以黄河三角洲1986,1996,2006年的三期TM影像为数据源,利用遥感图像处理软件对近代黄河三角洲湿地信息进行了提取.借助于地理信息系统软件和景观生态学软件,我们对20年来黄河三角洲湿地景观格局的动态变化,以及影响其格局动态变化的驱动力进行了分析.结果表明:(1)近20年来,人工湿地面积有了大幅度的增加,而天然湿地的比重在降低.其中,滩涂和柽柳灌草丛景观明显萎缩.(2)一些重要的景观格局指数的计算结果表明,20世纪90年代以来,黄河三角洲湿地景观斑块个数、香农多样性指数、香农均匀度指数一直在增加.黄河三角洲湿地景观的破碎化程度在加剧,斑块类型更加多样化,湿地景观中没有明显的优势类型且各斑块类型在景观中均匀分布.(3)湿地与湿地、湿地与非湿地之间发生着类型转化.其中,18.1%的芦苇草甸转化为农田;26.6%的翅碱蓬草甸转化为盐田;11.9%的芦苇沼泽转化为芦苇草甸.(4)在黄河三角洲湿地演化的过程中,受到自然和人为方面演化驱动力的共同作用.其中,自然因素主要有:黄河断流、泥沙淤积和自身演替动力等.人为驱动力主要为农田开垦、滩涂的开发与围垦、油田开发和人工建筑等.  相似文献   

19.
深入研究高铁对珠江三角洲(简称珠三角)城市群区域经济空间格局的影响,对挖掘高铁与区域经济耦合关系具有一定的科学价值。本文基于2010、2014、2018年珠三角地区城市面板数据,从区域经济联系、区域优势潜力及区域经济空间平稳性3个维度,运用引力模型、区位优势潜力模型、Theil系数等技术模型和方法,综合测度高铁对珠三角城市群区域经济空间格局的影响。研究结果表明:① 珠三角城市间经济联系强度随年份的递增而呈现上升的趋势,南北向联系强于东西向联系,并逐渐出现1个经济联系核心区、3个经济联系副关联区和1个经济增长辐射区;② 珠三角市际间区位优势潜力差距逐渐拉大,其中东莞、中山等经济实力较强、城市地域规模、人口规模较小且地理位置优越的二三线城市在高铁运营过程中获得更大的利益;③ 从珠三角区域经济整体差异性来看,区域经济空间格局异质性呈先扩大后缩小趋势;从区内群体差异性来看,一二线城市之间经济发展水平差异呈先大幅上升后小幅下降趋势;二三线城市之间经济发展水平差异呈下降趋势。该研究将对未来交通规划提供参考。  相似文献   

20.
长江三角洲土地资源遥感动态分析   总被引:5,自引:2,他引:3  
对土地资源需求的增长与有限的土地资源量之间的矛盾 ,是长江三角洲区域经济持续发展的主要矛盾之一。随着长江三角洲区域经济的快速发展 ,城市化、工业化进程加快 ,土地资源在高强度的开发中发生快速变化。在经济发展的同时 ,人与土地资源的矛盾更加尖锐 ,成为当前制约国民经济持续、协调发展的重要因素。长江三角洲地区是我国经济高度发达的地区之一 ,也是我国历史上少有的大面积粮食高产、稳产区。本文在利用遥感和 GIS技术对 1985~ 2 0 0 0年间全区土地资源进行动态分析 ,特别是在对耕地资源数量的定量分析基础上 ,结合区域土地资源的结构变化特点 ,深入研究其时空过程及动态变化规律 ,探索长江三角洲地区耕地动态平衡的措施与土地资源合理利用的对策 ,为区域农业持续发展服务。  相似文献   

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