论中国商业经济区的划分     

隋锡山 《地域研究与开发》1991,10(2):1-7,11

自改革开放以来,我国的商品经济发展很快。已由原来的单一计划经济,进入有计划的商品经济这一历史发展时期。商品的流通已成为促进区域商品生产、满足市场消费、加强区域经济联系的桥梁和纽带。因此,在劳动地域分工的基础上,研究和划分按商品流通的客观规律自然形成的商业经济地理区域;是地理科学,特别是人文地理学所面临的一项迫切任务。地域是商品经济活动的载体,科学地划分不同层次商品经济区域,它对于发展生产、繁荣经济、形成全国统一的市场、进入世界经济大循环具有重要的现实意义。  相似文献   

中国的脆弱态带与土地茺漠化   总被引：27，自引：5，他引：22  

朱震达 《中国沙漠》1991,11(4):11-22

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中国南方震旦纪火岩特征及喷发构造背景     

夏文杰  杜森官 《成都地质学院学报》1993,20(3):1-9

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VERTICAL PROFII,ES OF CHL-A AND PRIMARY PRODUCTIVITY IN THE MIDDLE CONTINENTAL SHELF AREA AND EDDY AREA OF THE EAST CHINA SEA     

Wu Yu-lin  Zhou Cheng-xu  Zhang Yong-shan 《中国海洋湖沼学报》2002,20(1):74-80

Vertical profiles of chl-a and primary productivity in the middle continental shelf area and eddy area of the East China Sea were studied using data from a cruise in the East China Sea in February to March, 1997 and a cruise in July, 1998. The results showed that chl-a vertical distribution closely related to in situ hydrological and nutrient conditions. Chla-a concentration ranged from 0.22 to 0.35 mg/m³ and 0.93–1.09 mg/m³ in the eddy area and in the middle continental shelf area, respectively. In both areas, chl-a concentrations in deep layers were slightly higher than those in shallow layers, but was of the same order of magnitude. In summer, when a thermocline existed in the water column, highest chl-a concentrations appeared at the base of the thermocline layers in both areas. In the eddy area, chl-a concentration maximized at 31.743 mg/m³, and averaged 1.143 mg/m³ below 30 m depth. In the middle continental shelf area, the highest chl-a concentration was 2.120 mg/m³, the average was 1.168 mg/m³. The primary productivity reached 1418.76 mgC/(m²·d) in summer and 1360.69 mgC/(m²·d) in winter. In the eddy area, the primary productivity was 787.50 mgC/(m²·d) in summer and 159.04 mgC/(m²·d) in winter. Vertical carbon sinking rate from the deep layer to the bottom in both areas is also discussed in this paper. Contribution NO. 4183 from the Institute of Oceanology, Chinese Academy of Sciences. Project No. 49636210 supported by NSFC.  相似文献   

中国首批国家地质公园巡礼     

《国土资源》2001,(4):17-18

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我国旅游资源开发经营与供地政策探讨   总被引：1，自引：0，他引：1  

钟京涛 《国土资源》2002,(8):20-22

随着社会经济的飞速发展,我国旅游业开始进入加速发展时期,新技术、新观念和新的旅游环境冲击着传统的旅游观念,工业旅游、农业旅游、生态旅游和会展旅游等逐步成为新的热点。巨  相似文献   

Report on Pontoniinae shrimps （Crustacea：Decapoda）collected by Joint Chinese—German Marine Biology Expeditions to Hainan lsland ,South China Sea：Ⅱ.Harpiliopsis,Ischnopontonia,Jocaste,Palae—mone     

李新正  刘瑞玉 《中国海洋湖沼学报》2003,21(2):154-165

The present paper reports 9 species of pontoniine shrimps collected from Hainan IS-land ,South China Sea ,by the Joint Chinese-German Marine Biology Expeditions,in which Peri-climenaeus arabicus (Calman,1939) and Periclimenaeus hecate (Nobili,1904) are recorded for the first time from Hainan Island.  相似文献   

A Chinese palaeontologist,Ma Ting Ying(1899-1979):From coral growth-rings to global tectonics     

《《幕》》2003,26(1):19-25

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江苏省同位素地质年龄数据库建设     

赵立鸿  程春梅 《江苏国土资源》2003,(8):26-28

系统介绍了江苏省同位素地质年龄数据库的建库工作及取得的主要成果，并针对同位素地质年龄数据库、工作指南和同位素地质测年工作等方面存在的问题提出了对策和建议。  相似文献   

我国周边国家的矿业立法大扫描     

宋国明 《国土资源》2003,(2):46-49

概况我国周边大多数国家属于发展中国家,与矿业有关的法律体系建立的比较晚,且不完善。20世纪90年代以来,各国为了促进矿业的健康发展,纷纷开始制定或修改矿业法。除泰国、巴基斯坦等国外,周边大多数国家出台了新的矿业法,或正在制定或修改矿业法。其目的是要建立和完善本国的矿业法律体  相似文献