朝鲜半岛地缘政治经济格局演变及俄罗斯政策走向评析   总被引：1，自引：3，他引：1  

焦连成  于国政 《世界地理研究》2002,11(1):90-94

俄罗斯历来重视朝鲜半岛的战略地位，半岛的稳定对其地缘政治经济战略具有重要意义。本文论述了俄罗斯不断调整的朝鲜半岛政策，对其形成背景、影响和制约因素进行了分析和探讨。  相似文献   

东北亚运输合作: 中国与朝鲜半岛陆路交通联系与运输组织战略   总被引：3，自引：0，他引：3  

金凤君 《世界地理研究》2002,11(1):24-32

本文从促进东北亚地区经济合作健康发展角度出发,以分析预测中国与朝鲜半岛间潜在的运输需求为基础,阐述了构建中国与朝鲜半岛陆路交通联系对完善东北亚和黄海经济区交通运输体系的战略意义;构想了组织陆路交通联系的地域模式,并简要评价了不同模式的可行性和经济效益潜力。提出了以“轴－辐”模式组织中国与朝鲜半岛的陆路交通联系是最合理的观点。  相似文献   

山东省招远金矿区春季赤松林的植物地球化学和反射光谱特征   总被引：1，自引：0，他引：1  

吴继友  倪健  冯素萍  蒋本和  张永贤  叶正丰 《遥感学报》1994,(2)

本文研究了山东省招远市台上金矿区与背景区赤松林的植物地球化学特征、赤松生长状况和光谱反射率特征的差异。结果表明，赤松对Ａｕ，Ａｇ，Ｃｕ，Ｐｂ等金属元素均呈强积累，赤松针叶中的Ａｕ、Ａｇ元素含量金矿区值和背景区值之比分别可达６和１８。重金属的过量吸收使金矿区赤松的生长状况变差，针叶内叶绿素含量减少，反射光谱特征明显变化。金矿区与背景区对比，赤松的红界蓝移幅度可达８—１２ｎｍ。随重金属污染程度的加重，近红外肩反射率值、叶绿素反射峰值与叶绿素吸收峰值之差均呈下降趋势，一阶导数谱７１０ｎｍ附近平顶斜率由正值变为负值，逐渐变小。反射光谱的这种变化规律可用以遥感探查赤松林下重金属矿藏。  相似文献   

Provenance of Paleozoic–Mesozoic sedimentary rocks in the Inner Zone of Southwest Japan: An evaluation based on Nd model ages     

H. Kagami  Y. Kawano  M. Akiyama  T. Ikawa  T. Imaoka  J. Ishioka  T. Toyoshima  T. Hamamoto  Y. Hayasaka  Y. Ikeda  M. Yuhara  Y. Tainosho 《Gondwana Research》2006,9(1-2):142

Nd model ages using depleted mantle (TDM) values for the sedimentary rocks in the Inner Zone of the SW Japan and western area of Tanakura Tectonic Line in the NE Japan allow classification into five categories: 2.6–2.45, 2.3–2.05, 1.9–1.55, 1.45–1.25, and 1.2–0.85 Ga. The provenance of each terrane/belt/district is interpreted on the basis of the TDMs, ¹⁴⁷Sm / ¹⁴⁴Nd vs. ¹⁴³Nd / ¹⁴⁴Nd relation, Nd isotopic evolution of the source rocks in East China and U–Pb zircon ages. The provenance of 2.6–1.8 Ga rocks, which are reported from Hida–Oki and Renge belts and Kamiaso conglomerates, is inferred to be the Sino–Korean Craton (SKC). The 2.3–1.55 Ga rocks, mostly from Ryoke, Mino and Ashio belts, are originally related with the SKC and/or Yangtze Craton (YC). The provenances of the sedimentary rocks with 1.45–0.85 Ga, from the Suo belt, Higo and some districts in the Mino and Ashio belts, are different from the SKC and YC. Especially, the Higo with 1.2–0.85 Ga is considered as a fragment of collision zone in East China. Akiyoshi belt probably belongs to the youngest age category of 1.2–0.85 Ga.Some metasedimentary rocks from the Ryoke belt have extremely high ¹⁴⁷Sm / ¹⁴⁴Nd and ¹⁴³Nd / ¹⁴⁴Nd ratios, whose main components are probably derived from mafic igneous rocks within the Ryoke belt itself and from the adjacent Tamba belt.  相似文献   

Does the Southern Korean Peninsula belong to the Amurian plate? GPS observations     

S. G. Jin  P. H. Park 《Studia Geophysica et Geodaetica》2006,50(4):633-644

The Amurian plate (AM) in Northeast Asia plays a particularly important role in the estimation of surrounding crustal movements and interpretation of seismic activities, especially in southwest Japan. However, the existence of the Amurian plate and the location of the southern boundary remain controversial. Due to insufficient data, the southern boundary is not well known and often assumed to cross the Southern Korean Peninsula. Therefore, this area is critical to further accurately define the Amurian plate geometry. The existing permanent Korean GPS network (KGN) with more than 45 GPS sites plays a key role to discriminate the southern boundary of the Amurian plate near South Korea. Data for the period from March 2000 to August 2003 are analyzed together with data from IGS and some Chinese GPS stations. Estimated velocities show that South Korea is almost rigid and the southern boundary of the Amurian plate may not cross South Korea. Using the F-ratio statistical test, we determine whether South Korea belongs to the Amurian or South China plates. The test has shown that the Southern Korean Peninsula neither resides on the Amurian plate as hypothesized, nor is part of the South China block.  相似文献   

Photosynthetic characteristics of dominant tree species and canopy in the broadleaved Korean pine forest of Changbai Mountains     

《中国科学D辑(英文版)》2006,(Z2)

Based on the light-photosynthesis response measurement at leaf level, combined with over- and under-canopy eddy covariance measurements, research on photosynthetic characteristics of single trees and forest canopy was conducted. The relationship between light intensity and photo-synthetic rates for leaves and canopy can be well fitted by a non-rectangular hyperbola model. Mongolian oak presented a high light compensation point, Lcp (28μmol·m-2·s-1), a light saturation point Lsp (>1800μmol·m-2·s-1), and a maximal net photosynthetic rate Pmax (9.96μmol·m-2·s-1), which suggest that it is a typical heliophilous plant. Mono maple presented the highest apparent quantum efficiencyα(0.066) but the lowest, Lcp (16μmol·m-2·s-1), Lsp (=800μmol·m-2·s-1), and Pmax (4.51μmol·m-2·s-1), which suggest that it is heliophilous plant. Korean pine showed the lowestαvalue but a higher Pmax, which suggest that it is a semi-heliophilous plant. At the canopy level, the values of both or and Pmax approached the upper limit of reported values in temperate forests, while Lcp was within the lower limit. Canopy photosynthetic characteristics were well consistent with those of leaves. Both showed a high ability to photosynthesize. However, environmental stresses, especially high vapor pressure deficits, could significantly reduce the photosynthetic ability of leaves and canopy.  相似文献   

Crustal Structure of the Southern Korean Peninsula from Seismic Waves Generated by Large Explosions in 2002 and 2004     

Ki Young Kim  Jung Mo Lee  Wooil Moon  Chang-Eob Baag  Heeok Jung  Myung Ho Hong 《Pure and Applied Geophysics》2007,164(1):97-113

In order to investigate the velocity structure of the southern part of the Korean peninsula, seismic refraction profiles were obtained along a 294-km WNW-ESE line and a 335-km NNW-SSE line in 2002 and 2004, respectively. Seismic waves were generated by detonating 500–1000 kg explosives in drill holes at depths of 80–150 m. The seismic signals were recorded by portable seismometers at nominal intervals of 1.5–1.7 km. Separate velocity tomograms were derived from first arrival times using a series expansion method of travel-time inversion. The raypaths indicate several mid-crust interfaces including those at approximate depths of 2–3, 15–17, and 22 km. The Moho discontinuity with refraction velocity of 7.8 to 8.4 km/s has a maximum depth of 37–39 km under the southern central portion of the peninsula. The Moho becomes shallower as the Yellow Sea and the East Sea are approached on the west and east coasts of the peninsula, respectively. The depth of the 7.6 km/s velocity contour varies from 29.4 km to 36.5 km. The discrepancy in depth between the seismological Moho and the interpreted critically refracting interface may result from the presence of a gradual transition between the crust and mantle. The velocity tomograms show particular crustal structures including (1) the existence of an over 70-km wide low-velocity zone centered at 6–7 km depth under the Okchon fold belt and Ryeongnam massif, (2) existence of high-velocity materials under the Gyeongsang basin, and (3) the downward extension of the Yeongdong fault to depths greater than 10 km.  相似文献   

全球化背景下在华跨国移民社区的空间生产——广州远景路韩国人聚居区的案例研究   总被引：9，自引：2，他引：7  

刘云刚  周雯婷  黄徐璐  全志英 《地理科学》2017,37(7):976-986

运用问卷和半结构化访谈的方法,梳理了远景路从城中村到跨国移民社区的空间生产过程。研究显示,广州远景路已形成以韩商为主的贸易产业链和韩国人与本地村民、外来人口混居的跨国移民社区,其中白云区政府、投资开发商和韩商三者共同参与,推动了远景路韩国人聚居区的空间形成。  相似文献   

Decadal Current Variations in the Southwestern Japan/East Sea     

William?J.?TeagueEmail author  Gregg?A.?Jacobs  Douglas?A.?Mitchell  Mark?Wimbush  D.?Randolph?Watts 《Journal of Oceanography》2004,60(6):1023-1033

Absolute geostrophic velocities were calculated along TOPEX/Poseidon (T/P) groundtracks located in the Ulleung Basin of the southwestern Japan/East Sea (JES) from a combined analysis of nearly a decade of T/P data and two years of pressure-gauge-equipped inverted echo sounder (PIES) data obtained during the United States Office of Naval Research’s JES Program. Geostrophic velocities have been calculated daily for the Ulleung Basin from June 1999 to July 2001 from a three-dimensional mapping of temperature and salinity produced by PIES data interpreted via the Gravest Empirical Mode (GEM) technique combined with the Navy’s Modular Ocean Data Assimilation System (MODAS). These velocities were then used to convert T/P velocity anomalies to absolute velocities for the T/P time period of 1993 to 2002. Current intensities and variabilities associated with the East Korean Warm Current, Ulleung Warm Eddy, and Offshore Branch are examined. Spatial and temporal variations of the sea surface circulation are strong. Intensification of the currents generally occurred during the fall season. The flow pattern in individual years differed greatly from year to year and differed from climatology in important qualitative ways.  相似文献   

全球化背景下在华韩国人族裔聚居区的形成与发展演变——以北京望京为例   总被引：4，自引：0，他引：4  

周雯婷  刘云刚  全志英 《地理学报》2016,71(4):649-665

随着近年的经济高速增长,中国已成为仅次于美国、日本的第三大韩国人移居地。在此背景下,运用实地调查和访谈方法,以北京望京为例,分析在华韩国人居住区及其族裔经济的形成与发展演变过程。北京望京是迄今为止在华韩国人聚集规模最大的社区,其以1998 年、2003 年为节点,经历了从花家地北移到望京西园,进而以望京西园为中心向外扩张的发展扩散过程。伴随着韩国人居住范围的扩大,面向韩国人的族裔经济也应运而生。当地的韩国人族裔经济多为韩国人和中国朝鲜族共同经营,以自我服务为主,已形成覆盖生产生活各方面的经济体系。相比中国国内的其他族裔聚居区,望京韩国人聚居区由于中国朝鲜族的参与,形成了主动融入、隐性隔离的特征,而这也为北京的移民管理和国际化城市建设带来了新挑战。  相似文献