CHANGE OF REGIONAL ECONOMIC DEVELOPMENT POLICY IN CHINA     

查彦玉 《中国地理科学(英文版)》1992,2(1):1-9

After 40 years of painstaking work, much improvement has been made in regional difference. The road of that development, however, is by no means a smooth one, full of setbacks and failure. The past forty years may be roughly divided into four stages: 1.a stage of rehabilitation and large scale transition towards the interior( 1949-1959), 2. the dispersion stage with an emphasis on the construction of the interior (1960-1977), 3. a stage of moving back to the coastland and relative concentration of constructions of large scale industries (1978-1980), and 4. a stage of taking the coastland as the focal point for regional development (since 1981). Since the late 1970s, China began to carry out what is known as the Open-door policy. Great changes have taken place in regional development policy.  相似文献   

Recent research progress and prospects in tourism geography of China   总被引：1，自引：1，他引：0  

Lin Lu  Jie Bao  Jianfeng Huang  Qijing Zhu  Chenglin Mu  Xiaole Chu  Yan Xu  Xiaoli Zha 《地理学报(英文版)》2016,26(8):1197-1222

Based on a large number of domestic literature reviews with related research abroad, academic standards and issues awareness have been intensified in domestic tourism geography, disciplinary consciousness and innovation enhancement. Hence, some valuable achievements have been made in the areas of tourism resources, tourism regional system, the spatial structure of tourism, tourism flow, ecotourism, tourism industry, tourism planning and tourism impacts, which strengthened the traditional advantages of research, expanded new areas of research and made research trends diverse. Meanwhile, with innovation of research methods, tourism geography in China is getting more and more internationally-oriented and reflecting Chinese characteristics. Research trends of China’s tourism geography are prospected: 1) Catering to national strategic needs, persisting problem-oriented, strengthening the metatheoretical research, and building Chinese “localization” of theory of tourism geography and method system. 2) Introducing and assimilating foreign theories and research methods, while focusing on explaining new tourism phenomena and problems in the domestic socio-economic background. 3) Concerning about the new regional spatial processes of demographic process, social process, and spatial process in new tourism trend. 4) Exploring interactive process and mechanism of man-land relationship and new models to develop territorial space under the tourism impacts. 5) Exploring important research issues of tourism geography in global, national, regional and local scales, from the point of view of spatial differentiation, scale transformation, interaction of man and nature, creating tourism geography interpretation system based on “process-structure-mechanism” of China. 6) Building theoretical system actively, while strengthening application-oriented research, and focusing on tourism poverty alleviation, tourism and heritage protection, national parks’ construction and other hot issues. Faced with econometrics research boom, we should return to rational thinking, using big data scientifically, while paying attention to the important role of qualitative evaluation in future research.  相似文献   

断陷湖盆超压封存箱形成机理与油气成藏机制——以渤海湾盆地东营凹陷为例   总被引：21，自引：7，他引：14       下载免费PDF全文

陈中红  查明 《地质科学》2008,43(1):50-64

东营凹陷的超压分布于沙河街组三段中-下亚段大套泥岩和沙四段灰色膏盐岩段中,常压—低压系统发育于上部层段,包括沙二段上亚段、东营组、馆陶组、明化镇组和更新统,形成二元结构。这些发育程度不同的超压体系可以构成不同级别的超压封存箱系统,控制着油气的运移和聚集。超压封存箱的形成是一个地球化学自组织过程,与系统内的流体对流运动及成岩作用密切相关。超压体系构成了准封闭的超压封存箱型自源油气成藏动力学系统,同时也可以通过幕式排放为浅层的新近系及古近系的沙三段上亚段至东营组常压开放性它源油气成藏动力学系统提供油源及成藏动力。超压不但是油气运聚的主要动力,而且在其产生与演化的过程中能形成微裂缝型油气运聚隐蔽输导体系,是形成岩性等隐蔽油气藏的重要条件。超压和断裂形成陆相断陷湖盆断—压双控流体流动机制。断裂是超压体系卸压的重要渠道,也是幕式排放的主要途径;与断裂沟通的砂岩体及构造背斜等是有利的勘探目标,超压泥岩体周围的透镜状砂体是隐蔽油气藏的潜在目标。  相似文献   

Triterpene-Enriched Olive Extract as an Immunopotentiator in Black Sea Bream ( Acanthopagrus schlegelii)     

Jiahuan Rong  Yu Han  Shanjie Zha  Yu Tang  Wei Shi  Xiaofan Guan  Xueying Du  Maolong He  Guangxu Liu 《中国海洋大学学报(英文版)》2020,19(2):428-438

Recently,the use of natural immunopotentiators,such as plant extracts,is predicted to offer high disease-prevention potential in aquaculture.However,few reports on the immunomodulatory impacts of olive extract(OE)on teleost are available.Therefore,the effects of dietary intake of triterpene-enriched OE on black sea bream(Acanthopagrus schlegelii)were investigated in this study.Our data showed that total blood cell counts,in vivo content of lysozyme,activities of antiprotease and myeloperoxidase,and contents of IL-4 and IL-6 were significantly up-regulated by dietary intake of triterpene-enriched OE.Additionally,the hampered immune response induced by cadmium exposure was significantly mitigated by the administration of OE as were indicated by partially or completely rescued immune-relating parameters.Furthermore,the expressions of immune-related genes encoding NF-κB inhibitor alpha(IkBα),tumor necrosis factorα(TNFα),cyclooxygenase-2(COX-2),and proto-oncogene protein c-fos(FOS)were found to be significantly up-regulated by the dietary intake of OE.In general,the results suggested that the dietary intake of triterpene-enriched OE has immune enhancing effect in black sea bream.Such effect may be realized by 1)increasing the total counts of diverse blood cells;2)activating nonspecific immune biomolecules;and 3)affecting signaling pathways such as IKK and ERK and subsequently inducing IL-4 and IL-6 biosyntheses.  相似文献   

Empirical calibration of the clinopyroxene–garnet magnesium isotope geothermometer and implications     

Wang-Ye Li  Fang-Zhen Teng  Yilin Xiao  Hai-Ou Gu  Xiang-Ping Zha  Jian Huang 《Contributions to Mineralogy and Petrology》2016,171(7):61

  相似文献   

Surface dynamic subsidence prediction model of solid backfill mining     

Xiaojun Zhu  Guangli Guo  Jianfeng Zha  Tao Chen  Qi Fang  Xiaoyu Yang 《Environmental Earth Sciences》2016,75(12):1007

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Holocene palaeoflood events recorded by slackwater deposits along the middle Beiluohe River valley,middle Yellow River basin,China          下载免费PDF全文

Yuzhu Zhang  Chun Chang Huang  Jiangli Pang  Xiaochun Zha  Yali Zhou  Xiaqing Wang 《Boreas: An International Journal of Quaternary Research》2015,44(1):127-138

Palaeohydrological investigations were carried out in the middle Beiluohe River valley in the middle Yellow River basin. Palaeoflood slackwater deposits (SWDs) are natural records of overbank flooding and are often identified in the Holocene aeolian loess–soil profiles along the river valley. Three bedsets of palaeoflood SWDs were found within the mid‐Holocene Climatic Optimum palaeosol (S₀) on the right riverbank. Both the sedimentary and the analytical results, including magnetic susceptibility, grain‐size distribution and concentrations of chemical elements, indicate that these palaeoflood SWDs were deposited from the suspended sediment load of overbank flooding. We identified three episodes of extraordinary overbank flooding events. These hydro‐climatic events were dated to 7600–7400, 5800–5000 and 4200–4000 a BP, from optically stimulated luminescence (OSL) dating and pedostratigraphical correlation. The minimum flood peak discharges were estimated to have been between 12 600 and 14 100 m³ s^?1 using the slope–area method. These hydro‐climatic events are considered to be a regional expression of known climatic events and demonstrate that the mid‐Holocene climate was far from stable. These results show that the magnitudes of floods are highly sensitive to climate change in semi‐arid and sub‐humid regions with a monsoonal climate.  相似文献   

On paleodrainage evolution in mid-late Epipleistocene based on radar remote sensing in northeastern Ejin Banner,Inner Mongolia   总被引：2，自引：0，他引：2  

WANGXinyuan GUOHuadong CHANGYueming ZHALiangsong 《地理学报(英文版)》2004,14(2):235-241

Radar remote sensing can acquire information of sub-surface covered by sand in arid area,detect surface roughness and vegetation coronet‘s layer and linear feature such as linear structure and channel sensitively. With sediment facies analysis, this paper studies the features of environmental evolution in mid-late Epipleistocene (60 ka BP-20 ka BP) in northeastem Ejin Banner. The conclusions are listed as follows: (1) The evolution of the three lakes, i.e. Gaxunnur, Sugunur and Tian‘e lakes, are dominated by faults and regional climate. (2) By analyzing sedimentary section of old Juyanze Lake,the three lakes used to be a large outflow lake before 50 ka BP in northeastem Ejin Banner, and at 50 ka BP, temperature declined rapidly in northwestem China. The event caused the lake‘s shrinkage. (3)By fault activity uplift in the northem part of old Juyan Lake and depression in the southem part, the lake‘s water followed fi‘om north to south at around 35 ka BP, old Juyanze fluvial fan was formed. At the same time, Juyan lake separated fi‘om Sugunur Lake and Wentugunr old channel was abandoned.(4) In recent 2000 years, Ruoshui River is a wandering river, sometimes it flows into Juyan lake and sometimes Sugunur and Gaxunnur lakes. Due to human activities and over exploitation, the oasis ecosystem is rapidly degenerated in 15 years (1986-2000).  相似文献   

黄上丘陵林地土壤侵蚀与土壤性质变化     

查小春  唐克丽 《地理学报(英文版)》2003,13(3):373-378

The serious soil erosion caused the fragile eco-environment in the Loess Plateau. In modern soil erosion of the Loess Plateau, the man-made accelerated erosion was the dominant erosion pattern (Tang etal., 1993a; 1993b). There are many kinds of human activities to accelerate erosion, of which the most influential activities are to destroy forest and grass, even to destroy vegetation. Reclamation at the expense of destruction of forestland and grassland artificially could increase soil erosio…  相似文献   

Magnetostratigraphy of the Qiliting section (SE China) and its implication for geochronology of the red soil sequences in southern China   总被引：5，自引：0，他引：5  

Caicai Liu  Xinmin Xu  Baoyin Yuan  Chenglong Deng 《Geophysical Journal International》2008,174(1):107-117

The red soil sequences in southern and southeastern China provide important terrestrial archives of palaeoclimate and palaeoenvironment and are important sources of Palaeolithic settlements and, therefore, early human occupation. Here we present detailed palaeomagnetic investigation coupled with mineral magnetic and petrographic analyses of a red soil sequence at Qiliting, southeastern China. The sediments contain both strongly magnetic minerals (such as maghemite and magnetite) and weakly magnetic minerals (such as haematite and possibly goethite). Maghemite and haematite were identified as the main carriers of the natural remnant magnetisations. Only haematite dominates the characteristic remnant magnetisations. Palaeomagnetic findings suggest that the Qiliting sedimentary sequence recorded the early Brunhes Chron and the late Matuyama Chron, including the Jaramillo Subchron. Our finding, coupled with previously published magnetostratigraphy, establishes that the red soil sequences in southern China began to accumulate no later than the Jaramillo age (i.e. ∼1.0 Ma). It is further suggested that the capabilities of recording magnetic polarity stratigraphy in Chinese red soil sequences are variable between areas because of different climate regimes.  相似文献