新疆城镇化绿色发展时空分异及驱动因子探究     

张军民  荣城  马玉香 《干旱区地理》2022,45(1):251-262

作为西部大开发重点和"一带一路"核心区,新疆城镇化具有鲜明的地域特色、地缘属性,科学诊断和识别城镇化绿色发展驱动因子,可为统筹边疆发展和安全格局提供实证依据.根据绿色发展和空间结构理论,用熵值法、地统计分析和探索性空间分析方法,基于ArcGIS空间分析平台,研究了2008—2018年新疆14个地州(市)城镇化绿色发展的...  相似文献   

内蒙古十八倾壕金矿床的叠加成矿作用——来自黄铁矿组分特征的证据     

梁一鸿  张宏颖  秦亚  刘雪松 《吉林大学学报(地球科学版)》2012,42(1):77-81

通过矿石中黄铁矿的ΔFe/ΔS值和Co/Ni值的分析,确定了内蒙古十八倾壕金矿床两种矿体-糜棱岩型矿体和石英脉型矿体中黄铁矿组分的不同特点：糜棱岩型矿体的黄铁矿属于贫铁贫硫型,Co/Ni值小于1;石英脉型矿体的黄铁矿属于贫铁富硫型,Co/Ni值大于1。这与该矿床两种矿石的S和Pb同位素的组成特征相呼应：前者反映同韧性剪切作用有关的变质热液成矿;后者反映岩浆热液成矿作用。这又一次在物质成分上证明了十八倾壕金矿床是两次成矿作用叠加的结果,同时也证明了前人提出的“不同层次叠加构造控矿”的观点。  相似文献   

云南屋顶绿化的特色浅析——以红河哈尼族彝族自治州为例     

梁辉 《云南地理环境研究》2009,21(4):21-24,F0004

屋顶绿化中国还没有部门管。从屋顶绿化的发展及其功能出发,结合人文思想、民族文化、生物多样性3个方面,以红河哈尼族彝族自治州为例,分析了当前云南5种屋顶绿化及其物质的特性,具有延续性、代表性、实用性、可操作性。发展屋顶绿化,有利于节能降耗,节地节水,改善城市生态环境,提高社区人居环境质量。这种绿化方式理应受到国家的重视,通过制定单项法律法规、行业规范、强制性标准,来应用推广。屋顶绿化,对于中国经济发达城市或者经济欠发达地区城市发展,特别对于云南这种西部城市用地紧缺,又相对缺水地区,以及提高房地产开发商商品房卖点均具有极大的推广示范作用。  相似文献   

城市边缘区的绿色城市设计理念与方法   总被引：3，自引：0，他引：3  

薛华培 《地域研究与开发》2009,28(3)

城市边缘区作为一个特殊区域,在城市化的快速推进中,呈现着城乡复合、动态多变的发展特征.由于多方面原因.城市边缘区在社会环境和自然空间环境方面还存在着较多的问题.要使城市边缘区和谐、健康发展,在规划建设中,必须遵循绿色城市设计的理念与原则,运用基于城市边缘区特征的、结合自然生态环境的城市设计方法,构建人性化的居住和公共空间,创造城市与农村多功能相互协调、多种价值体系综合优化的空间环境.  相似文献   

Impact of erosion-transported overburden dump materials on water quality in Lake Cospuden evolved from a former open cast lignite mine south of Leipzig, Germany     

A. Abel  A. Michael  A. Zartl  F. Werner 《Environmental Geology》2000,39(6):683-688

 Acidification is the most common water quality problem in lakes created from previous open cast lignite mines. Aeration of aquifers and dump materials from mining activities causes pyrite oxidation. Pyrite oxidation products are stored in pore water, minerals and at the exchange complexes of the aquifers and dump sediments. Rainfall runoff transports sediments on the dump slope into the lakes. Elutriation of these sediments whithin the lakes releases either acid-producing or acid-neutralizing agents. At a test site south of Leipzig, the annual erosion rates were quantified by water erosion models (RUSLE, EROSION 2D, PEPP) and field measurements. They ranged from 300 up to 900 tons per hectare. Hydrogen ion equivalent release or binding at the sediment elutriation was computed from laboratory analysis of the pore-water quality, ion exchange complex and mineral composition of the sediment. Two of the three investigated sediments contained 3 mmol (eq) acidity per 100 g dry sediment and revealed saturation with respect to jarosite, jurbanite and gypsum. In the third sediment, 6 mmol (eq) alkalinity per 100 g dry sediment was obtained. The annual net acidity influx was calculated to be about 0.5 million mol (eq) for the lake of the test site. Received: 2 November 1998 · Accepted: 26 January 1999  相似文献   

Biosorption of Cr (VI), Cr (III), Pb (II) and Cd (II) from aqueous solutions by Sargassum wightii and Caulerpa racemosa algal biomass     

Narayanaswamyb Tamilselvan  Kumar Saurav  Krishnan Kannabiran 《中国海洋大学学报(英文版)》2012,11(1):52-58

Heavy metal pollution is one of the most important environmental problems today.Biosorption is an innovative tech-nology that employs biological materials to accumulate heavy metals from waste water through metabolic process or physicochemi-cal pathways of uptake.Even though several physical and chemical methods are available for removal of heavy metals,currently many biological materials such as bacteria,algae,yeasts and fungi have been widely used due to their good performance,low cost and large quantity of availability.The aim of the present study is to explore the biosorption of toxic heavy metals,Cr(VI),Cr(III),Pb(II) and Cd(II) by algal biomass obtained from algae Sargassum wightii(brown) and Caulerpa racemosa(green).Biosorption of algal biomass was found to be biomass concentration-and pH-dependent,while the maximal biosorption was found at pH 5.0 and with the metal concentration of 100 mg L-1.S.wightii showed the maximal metal biosorption at the biomass concentration of 25 g L-1,followed by C.racemosa with the maximal biosorption at 30 g L-1.S.wightii showed 78% biosorption of Cr(VI),Cr(III),Pb(II) and Cd(II) ions.C.racemosa exhibited 85% biosorption of Cd(II) and Cr(VI),and 50% biosorption of Cr(III) and Pb(II).The results of our study suggest that seaweed biomass can be used efficiently for  相似文献   

遥感图像在复杂地形下矿山监测中的应用研究——以云南安宁矿区为例     

谭振华  洪友堂  孙启凯  赵志芳 《山东国土资源》2012,28(4):50-54

随着我国经济的飞速发展,对资源的需求量越来越大,矿产资源是主要的能源供应,因此矿产资源的开发监测变得尤为重要。该文将地形比较复杂的云南安宁矿区作为研究对象,论证了遥感图像在复杂地形下的矿山监测中的应用,认为相对目前采用的传统监测手段,遥感图像在时效性、效率、成本等多方面存在很多优势。  相似文献   

基于稳定映射分析的深圳绿色景观时空演化及启示   总被引：2，自引：0，他引：2  

常青  李双成  王仰麟  邱瑶 《地理学报》2012,67(12):1611-1622

绿色景观是城市开发建设所必需的空间资源,也是城市生态功能维续的基础和载体, 其动态演变过程关乎人类福祉与城市可持续发展。本文应用1986-2005年多时序的Landsat TM/ETM+遥感数据,采用改进型稳定映射变化轨迹分析、景观格局指数和系统聚类方法,综 合分析城市化以来深圳市绿色景观的时空动态演变过程,探讨其空间发生机制。结果表明： 研究期内深圳市绿色景观面积和类型组成变化显著,且均在1995年前后出现变幅拐点,具明 显的阶段性特征;全市绿色景观动态变化轨迹包括4大类、2中类和13小类,以类内转化过程 比例最高 (30.5%),由此引发的潜在生态环境影响应成为今后城市景观演变与生态环境效应研 究的一大重点;各类绿色景观变化轨迹形成集聚型、相对集聚型和分散型空间布局,长期保 持过程集中分布于高海拔地区,与低海拔区域分布的波动、消失过程构成空间共轭关系,地 形条件成为深圳市57%以上绿色景观的天然庇护。而在地形平坦的城市中,如何在快速城市化 过程中有效保留充足、高质量的绿色景观资源,是值得进一步深入探讨的问题。  相似文献   

Simulating spatiotemporal variability of blue and green water resources availability with uncertainty analysis   总被引：3，自引：0，他引：3       下载免费PDF全文

Depeng Zuo  Zongxue Xu  Dingzhi Peng  Jinxi Song  Lei Cheng  Shouke Wei  Karim C. Abbaspour  Hong Yang 《水文研究》2015,29(8):1942-1955

Due to rapid socioeconomic development, continuous population growth and urbanization, the world is facing a severe shortage of fresh water, particularly in arid and semi‐arid regions. A lack of water will put pressure on agricultural production, water pollution, as well as eco‐environmental degradation. Traditional water resources assessment mainly focused on blue water, ignoring green water. Therefore, analysis of spatiotemporal distribution of blue and green water resources in arid and semi‐arid regions is of great significance for water resources planning and management, especially for harmonizing agricultural water use and eco‐environmental water requirements. This study applied the Soil and Water Assessment Tool (SWAT) model and the Sequential Uncertainty Fitting algorithm (SUFI‐2) to calibrate and validate the SWAT model based on river discharges in the Wei River, the largest tributary of the Yellow River in China. Uncertainty analysis was also performed to quantify the blue and green water resources availability at different spatial scales. The results showed that most parts of the Wei River basin (WRB) experienced a decrease in blue water resources during the recent 50 years with a minimum value in the 1990s. The decrease is particularly significant in the most southern part of the WRB (the Guanzhong Plain), one of the most important grain production bases in China. Variations of green water flow and green water storage were relatively small both on spatial and temporal dimensions. This study provides strategic information for optimal utilization of water resources in arid and semi‐arid river basin. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

江西省地质灾害和矿山复绿数据库设计     

蓝俊  高薇  伍威 《中国地质灾害与防治学报》2014,25(4):123-128

为实现数据的统一集中存储及资料的互通互联,在对江西省地质灾害数据研究现状进行分析的基础上,从数据共享的角度提出建立江西省地质灾害和矿山复绿数据库。论文从数据库的概念设计、逻辑设计和物理设计等方面详细介绍了江西省地质灾害和矿山复绿数据的设计和建设过程。在概念设计阶段对地质灾害的基本E-R图进行设计;逻辑设计中对地质灾害和矿山复绿信息编码、空间数据库的结构和业务数据库逻辑结构进行了详细的讨论;物理结构设计对数据库表结构进行了介绍。最后介绍了部分地质灾害数据的管理功能。  相似文献