^226Ra and ^228Ra in the Seawater of the Western Yellow Sea     

MEN Wu )  WEI Hao )  and LIU Guangshan )  * ) College of Oceanography  Environmental Science  Xiamen University  State Key Laboratory of Marine Environmental Science 《中国海洋大学学报(英文版)》2006,5(3):228-234

1Introduction Therearefourradiumisotopesinnature,ofwhich224Ra,226Raand228Rahavebeenwidelyinvestigated inmarineresearch,butthespecificactivityof223Rais toolowtobemeasured,therefore,itsapplicationsarelimited(Moore,1969;Broeckeretal.,1976;KuandLin,1976;Nozak…  相似文献   

ANALYSIS OF DRIVING FORCES ON THE CHANGE OF HISTORICAL FARMLAND USE IN SHANDONG PROVINCE DURING THE QING DYNASTY （1644-1911）     

ZHANGXue-qin GEQuan-sheng ZHENGJing-yun 《中国地理科学(英文版)》2003,13(3):207-215

How land-cover has been changed by human use over the last 300 years is one of the five overarching questions guiding the Land-use/Cover Change (LUCC) Science/Research Plan. China has variety of historical docu-ments providing unique data superiority. So the characteristics of farmland area in Shandong Province during the Qing Dynasty (1644-1911) are summarized firstly: 1) the rising trend of farmland area was striking; 2) farmland area had re-markable fluctuation; 3) farmland area per capita decreased dramatically; 4) wasteland reclamation index increased rapidly. Then, the driving forces of farmland area change are analyzed. It is concluded that natural and human factors are jointly influential. Among the driving forces, human dimensions are the main factors of farmland area change,which direct the general tendency of the changes mentioned above. And the natural factors influence the stability of farmland area as well. Variation of the natural factors would act as the major contributory factor to farmland area change during years or periods of abrupt climatic changes, or during the intensive occurring periods of natural hazards.Besides, the passive aspects of human factors, such as war chaos also influenced the fluctuation of the farmland area.This research indicates that it is feasible to study the land-use/cover change by Chinese historical literatures, which has huge potential to provide a comprehensive picture of the growing dominance of human land-use and land-cover pat-terns that can be used in many global change research oroiects.  相似文献   

土地收益金和土地收益能否混为一谈     

牛晓亮 《河南国土资源》2003,(5):32-33

近几年,在国土资源管理部门征收国有土地租赁租金(俗称年租金)过程中,有不少地市同房管部门征收的出租门面房土地收益金“撞车”,它不仅造成同一种费用重复征收,加重用地单位的负担,损害政府形象,而且形成多头管理土地,使土地资产大量流失,甚至导致不安定因素的发生。造成此种现象的主要原因,虽然是某些部门的职能越位和错位,但是概念混淆、政策打架也是其原因之一。因此,要解决此问题,首先要弄清“土地收益金”和“土地收益”二者的概念。 让我们来看一下房管部门征收“土地收益金”的主要依据,它是根据建设部(1995)第42号令《城市房屋…  相似文献   

浅论土地信息资源的合理利用     

陈士银  朱红波 《广东海洋大学学报》2003,23(2):100-103

土地信息资源是与特定地块相关的各种信息，是土地管理工作处理的对象和结果。我国目前对土地信息资源的重要性认识还不够，缺乏技术人才，对土地信息资源的收集和利用存在缺乏市场机制和效率不高等问题。在土地管理过程中，可采取一定措施来合理利用土地信息资源。  相似文献   

Characters of the Pco2 and CO2 Flux in the East China Sea in Autumn     

纪雷  崔鹤  辛淑平  王军  张龙军  陆贤昆 《中国海洋湖沼学报》2003,21(2):180-186

Pco2 of air and seawater samples from the East China Sea(ECS) were measured in situ in autumn, 1994,Ocean currents,terrestrial fluviation,biological activities,etc.,Pco2 char-acters in air and seawater were investigated,CO2 flux and its character in the East China Sea are discussed on the basis of the Pco2 profiles of air and seawater,It was clear that the nearshore was the source of CO2;and tht the oulter sea area was the sink of CO2; and that the shelf area of the EXS is a net sink for atmospheric CO2 in autumn.  相似文献   

钱塘江流域的水文规律   总被引：2，自引：1，他引：1  

冯利华 《地理科学》1990,10(2):177-184

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中国南方沿海与内陆工业资源开发关系     

郭文卿  林发承 《自然资源》1990,(4):40-46

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河南省出台全面整顿和规范矿产资源开发秩序实施方案     

张永强 《河南国土资源》2006,(1):36

经省政府同意．河南省整顿和规范矿产资源开发秩序领导小组日前下发了《河南省全面整顿和规范矿产资源开发秩序实施方案》（以下简称《实施方案》），结合我省实际，对全省矿产资源开发秩序的整顿和规范工作进行了安排部署，以解决当前矿产资源开发中存在的突出问题。  相似文献   

我国矿山监督工作中亟待解决的几个问题     

尹明 《中国地质》1996,(3):22-23

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新闻业务培训班剪影     

陈明 《黑龙江国土资源》2005,(8):F0003-F0003

8月23日至25日，2005年全省国土资源系统新闻宣传业务培训班在牡丹江市举办，来自全省各地的近百名国土资源新闻宣传工作者参加了培训。  相似文献