珠三角区域旅游一体化机制创新探析     

张补宏  韩俊刚 《地理与地理信息科学》2011,27(6):96-100

在区域旅游发展进程中,区域发展主体在区域旅游一体化方面达成共识。该文从珠三角区域旅游一体化发展背景着手,分析了珠三角区域旅游一体化存在的国际客源市场薄弱、区域之间合作表层化等问题,其中机制建设不到位是问题的关键。珠三角区域旅游一体化机制创新应从管理和协调机构建立、政府"公域"领域的行动、区域合作"三层"空间以及"认知共同体"机制建设四方面进行。  相似文献   

黄河三角洲新生湿地土壤金属元素空间分布特征   总被引：8，自引：1，他引：7  

于君宝  董洪芳  王慧彬  陈小兵  谢文军  毛培利  高永军  单凯  陈景春  马向明 《湿地科学》2011,9(4):297-304

采用样带布点法,研究了黄河三角洲新生滨海湿地从黄河岸边至盐滩不同植物带上12种金属元素(Na、Mg、Ca、Al、Cr、Pb、Sr、Co、Ga、V、Ni和Ti)空间分布特征.结果表明,由黄河岸边至盐滩方向,除Ti以外,土壤中其他11种金属元素含量均呈逐渐升高的趋势;0～30 cm表层土壤中各金属元素含量均高于内陆沼泽;将...  相似文献   

长三角地区旅游城市体系组织秩序信息维数研究     

戴学军  林岚 《亚热带资源与环境学报》2011,6(2):75-82

对长三角地区旅游城市体系的旅游功能进行量化处理,采用分形方法研究其组织秩序来考察旅游城市体系对旅游活动的支撑作用,通过对长三角旅游城市体系组织秩序的信息维数的测算与分析,认为长三角地区旅游城市体系组织秩序具有较好的分形特征,系统结构比较紧致,各城市之间的整体性较好,对旅游活动的支撑作用较强.无论北部子系统还是南部子系统...  相似文献   

现代集装箱港口体系演进理论与实证   总被引：6，自引：4，他引：2  

王成金  César Ducruet 《地理研究》2011,30(3):397-410

集装箱技术的传播深刻影响了港口体系的发展,集装箱港口体系的理论模型重点解析该技术对港口体系空间时序过程的影响机制.基于相关研究进展的回顾与评述,根据港口发展的新现象与新机制,综合Hayuth和Notterboom的理论模型,介绍了集装箱港口体系的最新理论,将其分为前集装箱化、技术试验、巩周集中化、枢纽港中心化、扩散化与...  相似文献   

基于人口、产业和用地结构的城镇化水平评估与解释——以长三角地区为例   总被引：4，自引：1，他引：3  

曹广忠  边雪  刘涛 《地理研究》2011,30(12):2139-2149

城镇化水平评估是关于区域城镇化问题的基础性研究。本文从城镇化进程中城乡结构变动的核心要素出发,从人口、产业、用地结构三个方面设计考察指标,并强调三个维度进程间的协调关系和适宜性的评价尺度。对长三角地区的实证研究发现,区域城镇化水平的空间格局以“中心-外围”为突出特征,这种结构以嵌套方式存在于多种空间尺度之下,随时间推进...  相似文献   

Storm‐dominated shelf‐edge delta successions in a high accommodation setting: The palaeo‐Orinoco Delta (Mayaro Formation), Columbus Basin,South‐East Trinidad     

Andrew P. Bowman  Howard D. Johnson 《Sedimentology》2014,61(3):792-835

Pliocene age deposits of the palaeo‐Orinoco Delta are evaluated in the Mayaro Formation, which crops out along the western margin of the Columbus Basin in south‐east Trinidad. This sandstone‐dominated interval records the diachronous, basinwards migration of the shelf edge of the palaeo‐Orinoco Delta, as it prograded eastwards during the Pliocene–Pleistocene (ca 3·5 Ma). The basin setting was characterized by exceptionally high rates of growth‐fault controlled sediment supply and accommodation space creation resulting in a gross basin‐fill of around 12 km, with some of the highest subsidence rates in the world (ca 5 to 10 m ka^?1). This analysis demonstrates that the Mayaro Formation was deposited within large and mainly wave‐influenced shelf‐edge deltas. These are manifested as multiple stacks of coarsening upward parasequences at scales ranging from tens to hundreds of metres in thickness, which are dominated by storm‐influenced and wave‐influenced proximal delta‐front sandstones with extensive, amalgamated swaley and hummocky cross‐stratification. These proximal delta‐front successions pass gradationally downwards into 10s to 100 m thick distal delta front to mud‐dominated upper slope deposits characterized by a wide variety of sedimentary processes, including distal river flood and storm‐related currents, slumps and other gravity flows. Isolated and subordinate sandstone bodies occur as gully fills, while extensive soft sediment deformation attests to the high sedimentation rates along a slope within a tectonically active basin. The vertical stratigraphic organization of the facies associations, together with the often cryptic nature of parasequence stacking patterns and sequence stratigraphic surfaces, are the combined product of the rapid rates of accommodation space creation, high rates of sediment supply and glacio‐eustasy in the 40 to 100 Ka Milankovitch frequency range. The stratigraphic framework described herein contrasts strikingly with that described from passive continental margins, but compares favourably to other tectonically active, deltaic settings (for example, the Baram Delta Province of north‐west Borneo).  相似文献   

黄河三角洲新生湿地磷分布特征及吸附解吸规律   总被引：3，自引：0，他引：3  

孙军娜  徐刚  邵宏波 《地球化学》2014,(4):346-351

采用改进的 Hedley 磷分级方法研究了黄河三角洲新生湿地由河向海过渡带表层土壤磷形态变化和分布特征,并通过等温吸附解吸实验阐明了沿程土壤对外源磷的持留能力和释放风险。结果表明,各样点无机磷占总磷93%以上,是磷的主要存在形态。土壤中有机磷含量较低,可能与较低的有机质含量有关。无机磷中稀盐酸磷是最主要存在形态,与各样点Ca/Al含量密切相关。有效磷含量在18.6~33.4 mg/kg之间,仅占总磷的3.2%~5.9%,可能会限制湿地植物的生长。覆有植被的土壤中有效磷含量显著高于河滩和海滩土壤,说明植被存在对有效磷的积累有一定促进作用。由吸附解吸实验可知,加入较低浓度（0.05~5 mg/L）的外源磷时,随着初始磷浓度的升高,土壤对磷的吸附量增加,吸附率为70%~99%,解吸率小于7%,这说明各样点土壤的除磷能力较强,且流失风险较低。  相似文献   

辽河三角洲翅碱蓬湿地不同植被覆盖度下的土壤对碳的扣留   总被引：1，自引：1，他引：0       下载免费PDF全文

余雪洋  叶思源Nicholas Lawrence Yuknis Edward A. Laws赵广明  袁红明丁喜桂 王锦 《中国地质》2014,41(2):648-657

为研究辽河三角洲湿地的固碳能力,2010年5月在辽河三角洲双台子河口东侧的两个翅碱蓬湿地区域采取7个柱状样,通过对样品的化学分析测试,并利用210Pb测年法确定的沉积速率研究了土壤对碳的扣留速率,其结果表明:有机碳浓度分别与各营养元素浓度间有显著的正相关关系(p0.01),指示沉积物中的有机物质对营养元素有很强的富集能力,同时营养元素促进植物的生长,从而影响土壤碳的加积速率。研究区总碳浓度范围为10.5~14.6 g/kg,其中约83%为有机碳,其相应的土壤对总碳和有机碳扣留速率分别为98.02~260.37 g/m2/a(均值171.84 g/m2/a)和81.17~229.98 g/m2/a(均值141.29 g/m2/a)。本研究区,土壤对碳的扣留速率主要受土壤的沉积速率控制,并与高程有显著的相关关系(p0.01)。土壤对碳扣留机制的研究有助于加深对全球碳循的理解。  相似文献   

Composite Sand Bodies Architecture of Deep-Water Turbidite Channels in the Niger Delta Basin     

LIN Yu  WU Shenghe  WANG Xing  LING Yun  LU Yao  ZHANG Jiajia  YU Zhi 《《地质学报》英文版》2014,88(6):1822-1834

Abstract: Deep-water turbidite channels have attracted much attention as a focused issue in petroleum exploration and development. Extensive studies have been performed on the architecture of turbidite channels, and most researches have focused on their geometric shapes, sedimentary processes and controlling factors. However, little attention has been paid to the distribution patterns, distribution laws and quantitative studies of composite sand bodies of turbidite channels. Taken one slope area of the Niger Delta Basin as an example, this study conducted a semi-quantitative to quantitative analysis on architecture of composite sand bodies of turbidite channels based on cores, well logging and seismic surveys. It is shown that turbidite channel systems can be classified as confined and unconfined channel systems. For confined channel systems, the vertical evolution process involves four stages. The sinuosity of a channel system is controlled by slope, with a negative power function relationship between them. When slope gradient reaches four degrees, the channel system is nearly straight. Based on the migration direction and migration amount of single channels within channel complexes, channel composite patterns can be divided into four classes (the lateral composite, en-echelon composite, swing composite and vertical composite) and several subclasses. Various channel composite patterns show specific distribution laws spatially. For meandering channel complexes at the middle-late evolution stage of confined channel systems, the lateral migration amongst single channels shows the features of integrity and succession. The sinuosity of single channels in the late period is greater than that in the early period, and cut-offs may occur locally when the sinuosity is larger than five degrees. This study provides a better understanding for the geological theory of deep-water sedimentary, and also improves exploitation benefits of this type of reservoirs.  相似文献   

城市群水污染物排放的驱动因素及尺度效应     

周侃  殷悦  陈妤凡 《地理学报》2022,77(9):2219-2235

揭示水污染物排放的驱动因素及尺度效应是研究城市群演化环境效应的重要议题,也是实现城市群水污染物协同减排和水环境协同治理的重要前提。以长三角城市群的305个县域为例,选取化学需氧量（COD）和氨氮（NH₃-N）两项特征污染物指标,在2011—2016年水污染物排放时空格局分析基础上,采用空间滞后模型（SLM）和空间误差模型（SEM）评估城市群水污染物排放的驱动因素,构建多尺度地理加权回归（MGWR）模型诊断驱动力的尺度效应及空间异质性。结果显示：常住人口规模、城镇化水平和经济发展水平对水污染物排放呈现全域层面的正向驱动,而工业化水平、社会固定资产投资、外商直接投资、地方财政分权程度以局部的微观作用为主;固定资产投资在杭嘉湖及沿海地区对COD和NH₃-N排放均呈较强正向驱动,工业化水平在太湖流域及浙江全域对COD排放呈正向驱动;外商直接投资对NH₃-N排放呈局部抑制作用,外资投入的“污染光环”效应在苏北、皖北、浙南等城市群边缘区较为突出;地方财政分权在城市群中心区对COD排放具有明显抑制作用,反映出地方环保意识提升和多层级环境规制强约束的积极影响。建议引导绿色生产生活方式以降低水污染物排放基数,在工业生产、资本投入和财政收支等领域嵌入环境倒逼机制,系统构建与水环境承载力相适应的城市群高质量发展格局。  相似文献