共查询到20条相似文献，搜索用时 46 毫秒
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Marc-André Gutscher 《Geophysical Journal International》1995,122(2):617-636
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黑河绿洲坡面分异演化研究 总被引：4，自引：3，他引：1
对干旱区绿洲的物质和能量随坡面分异现象和规律的研究,有助于我们深刻了解不同类型绿洲形成和演化的自然背景和农业资源组合的特点,为农业生产的合理布局和农业自然资源的优化配置提供理论依据。以黑河流域绿洲为例,在综合分析影响绿洲坡面分异的气候、地质构造和地貌演化、地表水和地下水水文化学性质、土壤性状和水资源供应状况等自然地理要素基础上,将黑河绿洲划分为高位绿洲、中位绿洲和低位绿洲等不同类型。在此基础上,分析了黑河流域不同类型绿洲主要农作物气候适宜性随坡面的分异,为绿洲农业资源的优化配置提供了重要的理论依据。 相似文献
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Paleosalinity in the Tianluoshan site and the correlation between the Hemudu culture and its environmental background 总被引：1，自引：1，他引：0
Paleosalinity records of the Tianluoshan site are derived from measurations data of clay mineral, boron, strontium, barium, after field sampling in three profiles of the Tianluoshan site. The relative sea level changes are discussed according to the lab results. The record indicates that the region where the Tianluoshan site located has witnessed at least three times of relative sea level high-stand before, during and after the Hemudu period. Based on previous researches, this paper also focuses on discussing several environmental elements, the inter-relationships between environmental condition, human activities and development of the Hemudu culture comprehensively. 相似文献
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长三角地区城市化发展的态势与城镇组织模式的特征和趋势 总被引：5，自引：2，他引：3
基于产业结构升级与城镇空间组织模式协同的视角,对长三角地区城市化发展的态势与城镇组织模式的特征和趋势进行分析,以此为长三角城市群规划编制提供科学依据.认为:(1)长三角是我国城市化水平较高、发展速度较快的领先地区;(2)城市群主副中心相结合、并有多轴连通的网络化特征已初步显现;(3)从整体上观察,在一定程度上体现了圈层结构的某些基本特征,并正处于不断发展阶段;(4)目前以上海为中心基本上形成了4个圈层,预测未来将形成5个圈层;(5)空间轴线结构特征显著,并形成了"之"字形格局;(6)随着交通轴线的进一步拓展和衔接,将以此形成以超大或特大城市为节点的空间组织网络结构,在形态上形成多中心复合状的网络化模式. 相似文献
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Zhu Boyuan Li Yitian Yue Yao Yang Yunping Liang Enhang Zhang Chuncai Borthwick Alistair G. L. 《地理学报(英文版)》2020,30(1):145-163
Journal of Geographical Sciences - The morphological changing trend of the Yangtze Estuary, the largest estuary of Asia, has become a focus of research in recent years. Based on a long series of... 相似文献
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《The Professional geographer》2013,65(1):86-94
Despite widespread interest in the relationship between the exercise of power and control of space, few current works in geography make explicit use of the concept of territoriality. This paper does so by considering the means by which the Los Angeles Police Department pursues its law enforcement and order maintenance functions through regulating space. I draw upon fieldwork observations of a single LAPD patrol division to demonstrate that officers regularly seek to govern the citizenry through controlling the spatial parameters of permissible action. The imperative toward effective territorial control is given further impetus within the subcultural world that officers construct; indeed, officers evaluate each other's competence in large part on their ability to manage activity within the spaces for which they are responsible. 相似文献
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Paleosalinity records of the Tianluoshan site are derived from measurations data of clay mineral,boron,strontium,barium,after field sampling in three profiles of the Tianluoshan site.The relative sea level changes are discussed according to the lab results.The record indicates that the region where the Tianluoshan site located has witnessed at least three times of relative sea level high-stand before,during and after the Hemudu period.Based on previous researches,this paper also focuses on discussing severa... 相似文献
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RAE-ification and the consciousness of the academic 总被引：2，自引：0，他引：2
Alex Loftus 《Area》2006,38(1):110-112
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Steve Herbert 《The Professional geographer》1997,49(1):86-94
Despite widespread interest in the relationship between the exercise of power and control of space, few current works in geography make explicit use of the concept of territoriality. This paper does so by considering the means by which the Los Angeles Police Department pursues its law enforcement and order maintenance functions through regulating space. I draw upon fieldwork observations of a single LAPD patrol division to demonstrate that officers regularly seek to govern the citizenry through controlling the spatial parameters of permissible action. The imperative toward effective territorial control is given further impetus within the subcultural world that officers construct; indeed, officers evaluate each other's competence in large part on their ability to manage activity within the spaces for which they are responsible. 相似文献
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A.K.TULOKHONOV 《资源与生态学报(英文版)》2011,(3):280-282
The considerable part of the Northern Asia is occupied with the steppe and forest-steppe landscapes stretched by a wide strip from Caspian Sea to mountains of Big Khingan.Archeologists claim, that from here on the Bering Bridge after a glacial age ancestors of American Indian tribes have left to the North America. In the Baikal Lake basin we find settlements of ancient Huns, subdued the Eastern and Western Europe in the beginning of last millennium. 相似文献
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《New Zealand geographer》1954,10(2):197-200
MAP AND LANDSCAPE. By Dorothy Sylvester.
MAPS AND DIAGRAMS. By F. J. Monkhouse and H. R. Wilkinson.
THE LOOK OF MAPS. By Arthur H. Robinson.
ELEMENTS OF CARTOGRAPHY. By Arthur H. Robinson.
GEOGRAPHY FROM THE AIR. By F. Walker.
OUR WORLD FROM THE AIR. By E. A. Gutkind. London: Chatto and Windus, 1952, pp. 250. 相似文献
MAPS AND DIAGRAMS. By F. J. Monkhouse and H. R. Wilkinson.
THE LOOK OF MAPS. By Arthur H. Robinson.
ELEMENTS OF CARTOGRAPHY. By Arthur H. Robinson.
GEOGRAPHY FROM THE AIR. By F. Walker.
OUR WORLD FROM THE AIR. By E. A. Gutkind. London: Chatto and Windus, 1952, pp. 250. 相似文献
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澜沧江河道冲淤变化与来沙系数的格兰吉尔因果分析 总被引：4，自引：0，他引：4
采用格兰吉尔因果关系模型以及时间序列平稳性的ADF检验技术,结合23年的实测资料数据,分析了澜沧江天然来沙量的变化是否会导致澜沧江河道冲淤发生变化。结果发现:(1) 澜沧江历年来沙系数变化是一个不稳定的时间过程、但历年冲淤变化却是一个稳定的时间过程;(2) 澜沧江河道(允景洪断面)历年来沙系数变化对于冲淤变化不存在格兰吉尔因果关系,或前者对后者无预测关系,因此澜沧江河道来沙系数的增加(或减少)都不一定导致断面淤积量增大(或冲刷量增大)。前人得出的"随来沙系数的增大,断面淤积量有所增加,反之,则冲刷量增加"的结论值得商榷。 相似文献
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西藏自治区农牧业和农牧区经济结构战略性调整探讨 总被引：5，自引：0，他引：5
自改革开放以来，西藏农牧区基础设施建设和农牧业综合生产能力发生了显著的变化，农牧民收入呈现稳定增长态势。在新的形势下，如何加快农牧民收入的增长，实现党的十六大提出的全面建设小康社会的目标，进一步推进农牧业和农牧区经济结构战略性调整显得十分的必要。根据西藏的实际情况，提出农牧业和农牧区经济结构战略性调整的基本构架，即在确定“九个生态经济区”基础上，建设“九个特色优势资源生产基地”和发展“九个特色优势产业”；对各生态经济区发展方向及其特色优势资源生产基地和特色优势产业的布局与发展进行了分析。 相似文献
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休闲农业与美丽乡村耦合度评价指标体系构建及应用 总被引：3，自引：0，他引：3
休闲农业的发展为美丽乡村建设提供有力的产业支撑,美丽乡村建设为休闲农业发展提供必要的技术和管理支持,二者的协调发展对于乡村地区建设生态文明,实现"美丽中国"具有重大意义。在对休闲农业与美丽乡村两个子系统预选指标选择的基础上,通过专家筛选、聚类分析、相关性分析、指标鉴别和定量检验,构建一整套科学、全面评价休闲农业与美丽乡村耦合度的指标体系,并通过层次分析法和包络数据分析法确定各指标的权重,再以物理学上容量耦合模型为依据构建耦合协调度评价模型。以都江堰现代农业区为例进行实证分析,运用这套指标体系进行休闲农业与美丽乡村之间耦合度的评价,为休闲农业和美丽乡村耦合协调发展以及进一步破解"三农"问题提供指导。 相似文献
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Beirut and the creation of the rent gap 总被引：1，自引：1，他引：0
Marieke Krijnen 《Urban geography》2018,39(7):1041-1059
This article investigates how rent gaps are created in Beirut, Lebanon, and makes a two-fold argument. First, it argues that rent gaps are created by state-legitimized power and agents of capital through the legal framework, and that the role of location in determining differences between potential ground rents, so salient in Beirut, demonstrates the complementarity of neoclassical land rent theory and rent gap theory. Second, it argues that beyond the legal framework, rent gaps in Beirut are formed through informal, illegal and exceptionalist practices as well as civil, sectarian conflict and forced displacement. This extends the range of forces to consider when thinking about what creates and shapes rent gaps. The paper emphasizes the necessity of a critical perspective on the ways in which value in urban space is created in the interests of the state and agents of capital, while attuning rent gap theory to a more global perspective. 相似文献
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农村富余劳动力资本化及其转移中的教育培训作用研究 总被引：1，自引：0，他引：1
就我国农村富余劳动力转移现状及存在问题,结合国外发达国家转移的作法,从劳动力资源化和资本化的理论分析出发,分析了劳动力转移过程中的结构性矛盾.以此得出,加强教育培训,提高富余劳动力的劳动技能和素质是解决问题的关键.最后对我国农村富余劳动力转移中的教育和培训提出了对策和建议,即高度重视农村劳动力教育培训工作,建立农民职业技术教育培训体系,形成农民教育培训投入机制,强化农民专业技能培训的针对性. 相似文献
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长江中下游滩地的独特性与血吸虫病防治 总被引：4，自引：1，他引：4
湿地是地球上重要的生存环境和生态系统,有“自然 之肾”的美誉。长江中下游流域是我国湿地分布集中的区 域,我国著名的五大淡水湖均分布于此。长江中下游滩地比 较独特的特征可以概括为:冬陆夏水,枯水一线、丰水一片; 面积广大、生物多样性丰富;条件优越、经济发达;人口密 集、灾害频繁等。长江中下游湿地的重要性不但吸引了广大 学者、专家对其进行研究,而且也引起了国家和国家领导人 的重视。彭镇华、江泽慧等本着以人为本的湿地保护原则, 创造性地提出了抑螺防病林作为一个新林种的新概念,建立 了一套较为完整的理论和实践体系。这一理论不但极大地丰 富了我国滩地林业生态工程理论,而且实践证明其经济、生 态、社会等复合效益十分可观,是灭螺防病和长江中下游流 域湿地开发相结合的行之有效的生态措施。长江中下游湿地 的建设要遵循国家正确方针的指导,本着以人为本,坚持生 态建设的道路,加强长江中下游湿地建设的立法工作,着重 就长江中下游湿地关系到国计民生和地区可持续发展的功能 进行深入研究。在党和国家的关怀、支持下,在广大学者、 专家的努力下,长江中下游湿地必然会发挥出其重要的作 用,为国家的可持续发展做出其应有的贡献。 相似文献