甘肃北山1∶5万前红泉等三幅矿产远景调查新进展

为查明甘肃北山前红泉一带地层、岩浆岩、构造等地质特征和成矿地质条件,总结成矿规律,进行矿产资源远景评价和成矿预测,开展了 1 ∶ 5万前红泉等三幅矿产远景调查工作.通过4个年度工作,重新厘定了工作区地层系统,建立了区内岩浆岩演化序列,在构造解析的基础上探讨区域构造演化史.将"O-S"地层(敦煌岩群)解体为4个填图单元,...     

Adaptation management of mountain tourism service: the case of the source regions of the Yangtze and Yellow River

Mountain areas are often rich in ecological diversity and recreational opportunities. Mountain tourism is thought to be an effective and important means for maintaining and expanding rural economies and, thus, improving the living conditions of rural societies. As mountain tourism service research is a professional field with several disciplines involved, a multi-disciplinary management pIatform is needed and it facilitates participation in sustainable mountain development by diverse stakeholders. With the source regions of the Yangtze and the Yellow River as a case study, this paper presents a conceptual framework for an adaptation management of mountain tourism services according to technical, policy, social and economic dimensions. The framework is based on a vulnerability assessment of mountain ecosystems, and can serve as a reference for the development of tourism service in other mountain areas.     

基于土地利用的三维景观格局指数变化分析

由于传统二维景观格局指数未考虑地形特征对景观格局指数的影响,为进一步研究地形结构对景观格局指数的影响,以重庆主城区为研究对象,利用ENVI5.2、ArcGIS10.5、Fragstats4.2平台,对重庆主城区不同城市化阶段的Landsat影像数据进行土地利用变化和三维景观格局分析.结果表明,2008-2018年研究区...     

小气候、雪盖及土壤湿度对高山生态系统功能的影响

1 Introduction High mountain landscapes above the tree-line are often regarded as close to nature, although human impact has obviously changed the environment, partly exceeding its carrying capac- ity (L?ffler, 2000). Due to their fragility regarding expected environmental changes and an increasing land use pressure in many regions, high mountain landscapes recently became a major focus within the discussion on a sustainable development in a worldwide (Messerli and Ives, 1997), and regional p…     

大别山及其周边现今垂直形变研究

基于1980年、2005年和2015年3期区域精密水准网观测资料,利用线性动态平差模型计算获取大别山地区水准网长期垂直运动速度场图像。研究发现,淮河平原地表下沉较为严重,大别山呈现弱隆升趋势运动,长江谷地边缘地区较大别山区呈现明显的隆升运动。跨郯庐断裂带水准剖面结果显示,垂直运动与地形呈负相关和弱相关。     

双循环新格局下重庆市城镇化发展动力与实现路径

源于时代之变而构筑的双循环新发展格局是市场经济条件下多尺度空间输出理论与劳动地域大分工的“叠加”,为新型城镇化发展带来新的动力源泉。为了揭示这种影响,首先将科技创新和制度改革这2个城镇化发展动力外生变量内生化,构建基于“四维驱动力模型+创新力+制度力”的城镇化动力因子分析框架,结合主成分回归模型对2000年以来重庆市城镇化发展动力进行分析,并据此引入波特的“钻石模型”对其城镇化发展路径进行系统思考。结果表明：1）纳入动力因子体系的创新力和制度力对重庆市城镇化发展产生显著的正向驱动效应,其中创新力表现最为明显。2）重庆市城镇化发展是“六维力”共同作用的结果,但市场力和行政力依然是最主要的驱动力;其次是创新力、内源力和外向力,其中创新力对城镇化发展的驱动效应已在阶段2(2010—2018年)超越行政力的作用效应;最后是制度力;间接反映重庆市城镇化本身是一个内生作用的过程,构筑“以国内大循环为主体、国内国际双循环相互促进”新发展格局具有客观必然性和前瞻性。3）基于波特“钻石模型”分析指出：重庆市存在增长极体量小、市场购买力不足、产品低端化、同质化现象严重等问题,并据此从发展高级生产要素、创造...     

重庆市乡村义务教育资源可得性差异及影响因素

以国家统筹城乡教育发展试验区的重庆市乡村地区为例,采用Densi-Graph城乡识别法进行行政区划内部格网尺度的精准识别,在此基础上探究义务教育资源可得性水平的空间差异及影响因素。结果表明：1)基于Densi-Graph城乡识别法的重庆市城乡差异显著,乡村区域面积达79 752 km²,占区域总面积的96.82%。城市部分面积为2 616 km²,占区域总面积的3.18%。2)重庆市义务教育资源可得性水平具有显著的空间集聚与关联特征,并呈现由中心城区向外递减的格局。3)政府重视程度、社会经济发展水平、交通设施水平、自然地理环境均与义务教育资源可得性水平具有显著相关性。4)交通站点密度与教育投入是影响义务教育资源可得性水平的主导因子,二者与各项因子的交互叠加作用增强效果显著;影响机制上,地形起伏度与坡度是乡村义务教育资源可得性水平的限制条件,社会经济是基础,交通是关键,教育投入是核心。     

鄂西-渝东地区热史恢复及烃源岩成烃史

根据鄂西—渝东地区镜质体反射率数据进行的热史恢复结果表明:该区在晚二叠世初期达到最高古热流(可达68~78mW/m²,地表热流),从晚二叠世初到现今古热流持续降低,在侏罗纪末期古热流平均为~54mW/m²(地表热流);鄂西—渝东地区中生界与新生界之间不整合面的剥蚀量可达1700~4000m。成烃史研究表明:鄂西—渝东地区志留系烃源岩在晚志留世—早二叠世进入生油高峰,在早-中三叠世进入生气期,中侏罗世晚期进入过成熟干气阶段,快速生烃时期是在晚志留世、二叠纪—中三叠世及早-中侏罗世;而二叠系烃源岩在早三叠世进入生油门限,于中-晚三叠世达到生油高峰,在中-晚侏罗世进入生气期,晚侏罗世晚期进入过成熟,快速生烃时期是在早-中三叠世及侏罗纪。     

Sensitivity of streamflow from a Himalayan catchment to plausible changes in land cover and climate

Global climate change will likely increase temperature and variation in precipitation in the Himalayas, modifying both supply of and demand for water. This study assesses combined impacts of land‐cover and climate changes on hydrological processes and a rainfall‐to‐streamflow buffer indicator of watershed function using the Soil Water Assessment Tool (SWAT) in Kejie watershed in the eastern Himalayas. The Hadley Centre Coupled Model Version 3 (HadCM3) was used for two Intergovernmental Panel on Climate Change (IPCC) emission scenarios (A2 and B2), for 2010–2099. Four land‐cover change scenarios increase forest, grassland, crops, or urban land use, respectively, reducing degraded land. The SWAT model predicted that downstream water resources will decrease in the short term but increase in the long term. Afforestation and expansion in cropland will probably increase actual evapotranspiration (ET) and reduce annual streamflow but will also, through increased infiltration, reduce the overland flow component of streamflow and increase groundwater release. An expansion in grassland will decrease actual ET, increase annual streamflow and groundwater release, while decreasing overland flow. Urbanization will result in increases in streamflow and overland flow and reductions in groundwater release and actual ET. Land‐cover change dominated over effects on streamflow of climate change in the short and middle terms. The predicted changes in buffer indicator for land‐use plus climate‐change scenarios reach up to 50% of the current (and future) range of inter‐annual variability. Copyright © 2010 John Wiley & Sons, Ltd.     

Slump debris flows in the Akovolwo Mountains area of Benue State,Nigeria

In September 1979, rain-induced complex landslides occurred in two separate localities along the slopes of the Akovolwo Mountains near Jato-Aka in the Kwande Local Government area of Benue State, Nigeria.The two movements developed on bedrock slopes covered by a veneer of colluvium and (or) residuum no more than 1.5 to 2m deep. Each started as a slump and graduated into a debris flow. The slump, extending downhill a short distance away from the head scarp, had been reconstituted into a debris flow as the initial movement (sliding movement) of the soil mass caused remoulding of the saturated moving mass into viscous debris-laden mud. The resulting mass moved partly along a pre-existing mountain stream channel and partly along a fresh channel it cleared in the savanna forest. At the break of slope, the mass of boulders was dumped and a trail of smaller fragments littered the channels towards the Katsina-Ala River.