1985-2005年环渤海地区土地利用变化时空格局     

郭丽英  王道龙  邱建军  王立刚  刘玉 《地理学报(英文版)》2009,19(5):568-576

Based on TM image data and other survey materials, this paper analyzed the spatiotemporal patterns of land use change in the Bohai Rim during 1985–2005. The findings of this study are summarized as follows: (1) Land use pattern changed dramatically during 1985–2005. Industrial and residential land in urban and rural areas increased by 643,946 hm², of which urban construction land had the largest and fastest increase of 294,953 hm² at an annual rate of 3.72%. (2) The outward migration of rural population did not prevent the expansion of residential land in rural areas by 184,869 hm². This increase reveals that construction of rural residences makes seriously wasteful and inefficient use of land. (3) Arable land, woodland and grassland decreased at a rate of −0.02%, −0.12% and −1.32% annually, while unused land shrank by 157,444 hm² at an annual rate of −1.69%. (4) The change of land use types showed marked fluctuations over the two stages (1985–1995 and 1995–2005). In particular, arable land, woodland and unused land experienced an inversed trend of change. (5) There was a significant interaction between arable land and woodland. Industrial construction land in urban and rural areas showed a net trend of increase during the earlier period, but only adjustment to its internal structure during the second period. The loss of arable land to the construction of factories, mines and residences took place mainly in the fringe areas of large and medium-sized cities, along the routes of major roads, as well as in the economically developed coastal areas in the east. Such changes are closely related to the spatial differentiation of the level of urbanization and industrialization in the region.  相似文献   

青海省祁连县大拉洞柏杨沟矿区煤岩层对比研究          下载免费PDF全文

王立刚  于松  冯园园  赵宝聚  魏伟  王琳琳  薛玉琴 《山东国土资源》2016,32(9)

通过研究太原组的沉积特征及聚煤变化规律,采用了标志层、煤岩层组合特征、层间距、测井曲线形态等方法,对矿区内煤层、岩层进行了综合对比。确定了该区主要煤层的赋存层位、形态、分布及变化特征,对周边地区找煤工作具有一定的指导作用。  相似文献   

胶莱盆地东北缘龙口- 土堆矿区金矿床成矿规律研究     

赵宝聚  高明波  李亚东  付厚起  李大兜  冯启伟  张鼎  郑德超  马明  王立刚 《地质学报》2019,93(S1):1-11

海阳市龙口- 土堆金矿床是胶莱盆地东北缘金矿床的重要典型矿床之一。金矿床位于胶莱盆地东北缘一个微凸起,以NE向断裂面为界。矿体严格受断裂构造控制,主要矿体受控于NE走向、SE倾的左行压扭性断裂构造,并在构造的引张和产状变化部位形成厚大矿体;矿床成因为岩浆期后中低温热液构造蚀变岩型金矿;成矿时间集中在119±10Ma。成矿热液中硫源可能与脉岩来自同一或类似源区,在上升成矿过程中又萃取了围岩荆山群中的硫及成矿物质。胶莱盆地东北缘金成矿带成矿流体相似,均为岩浆水混合大气水。主成矿期成矿流体为中高温、低盐度的CO2- NaCl- H2O体系。成矿期次划分为热液期和表生期两个阶段。  相似文献   

区域农牧业可持续发展决策支持系统研究   总被引：1，自引：0，他引：1  

姚艳敏  王立刚  陈仲新  唐华俊  李文科  王毅敏  马成龙  白锐峥  陈敦善  费健雄 《地域研究与开发》2007,26(2):112-116,123

以区域农牧业可持续发展为研究对象,采用地理信息系统(GIS)、遥感(RS)、全球定位系统(GPS)的"3S"技术和数据库技术,建立了区域资源环境、社会经济空间和属性数据库.通过计算机技术、GIS技术和数据库技术构建了区域农牧业可持续发展决策支持系统,集成了耕地利用评估模型和草地建设管理模型,并进行了山西省雁门关生态畜牧经济区的实证研究.区域农牧业可持续发展决策支持系统将为农业结构调整、农牧业可持续发展提供决策支持.  相似文献   

渤海湾西岸全新世最大海侵位置探讨——以天津市西南精武镇一带为例     

方晶  胡克  张国艳  王俊杰  王立刚  白铁磊  任小松  舒琳 《海岸工程》2012,(3):45-54

通过对位于天津西青区精武镇的小南河村西南H孔和潘楼村西PL孔2个钻孔做粘土混浊水电导率,结合贝类及有孔虫鉴定,区分了海相层和陆相层的界限,探讨了天津市西南全新世最大海侵的特征。结果表明:天津精武镇附近早中全新世以来经历了陆相-短暂的海陆过渡相-陆相的沉积过程,全新世最大海侵位置在H孔与PL孔之间,距现代海岸线大约57km。H孔的薄层海相层为全新世最大海侵期形成的海陆过度相沉积物的边缘。  相似文献   

地震时程分析的时频联合缩减法     

张氢  吴丹  范人杰  王立刚  秦仙蓉  孙远韬 《地震工程与工程振动》2012,32(2):61-67

为了减少动态时程法的计算开销,根据地震时程记录的能量在时间-频率域内主要集中在特定时间段和低频分量中的特点,用离散小波变换,变采样率重构时程记录,以达到在时程计算时减少积分步数,节约计算时间的目的。通过有限元数值实验,表明该法可有效缩短计算时间,同时计算误差不超过5%,在工程范围内可以接受。  相似文献