检索结果-南通市图书馆

Lithospheric structure and faulting characteristics of the helan mountains and Yinchuan Basin： Results of deep seismic reflection profiling

引用

Science China Earth Sciences 2017年第3期60卷 589-601页

作者： LIU BaoJin FENG ShaoYing JI JiFa WANG ShuaiJun ZHANG JianShi YUAN HongKe YANG GuoJun Geophysical Exploration Center of China Earthquake Administration Zhengzhou 450002 China

The helan mountains and Yinchuan Basin （HM-YB） are located at the northern end of the North-South tectonic belt, and form an intraplate tectonic deformation zone in the western margin of the North China Craton （NCC）. The HM-YB has a complicated history of formation and evolution, and is tectonically active at the present day. It has played a dominant role in the complex geological structure and modem earthquake activities of the region. A 135-km-long deep seismic reflection profile across the HM-YB was acquired in early 2014, which provides detailed information of the lithospheric structure and faulting characteristics from near-surface to various depths in the region. The results show that the Moho gradually deepens from east to west in the depth range of 40-48 km along the profile. Significant differences are present in the crustal structure of different tectonic units, including in the distribution of seismic velocities, depths of intra-cmstal discontinuities and undulation pattern of the Moho. The deep seismic reflection profile further reveals distinct structural characteristics on the opposite sides of the helan mountains. To the east, The Yellow River fault, the eastern piedmont fault of the helan mountains, as well as multiple buried faults within the Yinchuan Basin are all normal faults and still active since the Quaternary. These faults have controlled the Cenozoic sedimentation of the basin, and display a ＂negative-flower＂ structure in the profile. To the west, the Bayanhaote fault and the western piedmont fault of the helan mountains are east-dipping thrust faults, which caused folding, thrusting, and structural deformation in the Mesozoic stratum of the helan mountains uplift zone. A deep-penetrating fault is identified in the western side of the Yinchuan Basin. It has a steep inclination cutting through the middle-lower crust and the Moho, and may be connected to the two groups of faults in the upper crest. This set of deep and shallow fault system con

关键词： North China Craton Deep seismic reflection profile Lithospheric structure helan mountains Yinchuan Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characteristics of the three-dimensional deep electrical structure in the helan mountains-Yinchuan Basin and its geodynamic implications

引用

Science China Earth Sciences 2023年第3期66卷 505-520页

作者： Lingqiang ZHAO Xiangyu SUN Yan ZHAN Jing HAN Haibo YANG Peijie WANG Xuehua LIU State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Lhasa National Geophysical Observation and Research Station Lhasa 850004China The Second Monitoring and Application Center China Earthquake AdministrationXi’an 710043China

Located in the north segment of the North-South seismic belt where the Alxa block(AB)and the Ordos block(OB)contact,the helan mountains-Yinchuan Basin(HLM-YCB)constitutes a typical normal faulting basin-mountain structure on the Chinese *** 1739 M8.0 Pingluo earthquake occurred in the Yinchuan fault depression basin with such a basinmountain *** on five magnetotelluric profiles encompassing distinct segments of the HLM-YCB were utilized for three-dimensional(3D)joint inversion in order to collect fine 3D electrical structure information at a crustal and upper mantle scale across the entire *** electrical structure between the main blocks in the HLM-YCB and adjacent areas is characterized by east-west horizontal blocks OB,YCB,and HLM,which are divided by the Yellow River fault(F5)with the HLM eastern piedmont fault(F2)as electrical boundary zones on the east and west *** two main block units,AB and OB,exhibit an obvious layered resistivity ***,the HLM-YCB is characterized by a typical basin-mountain structure with the mountains as a high-resistivity body and the basin as a low-resistivity body,and in the northern YCB a large-scale lowresistivity structure exists,extending to the upper mantle,probably derived from the upwelling of mantle-derived *** is speculated from a combination of recent 3D crustal movement field information and other data that the HLM-YCB is an active tectonic zone formed via regional tensile *** formation of the HLM-YCB lies in the interaction of the Tibetan Plateau(TP),AB,and OB and abnormal mantle activities beneath the *** HLM-YCB reflects the joint action of upwelling and diffluence caused by the underplating of hot materials from the deep mantle with gravity and the redistribution of regional tectonic stress on the earth’s surface,which may be the main dynamic reason for the 1739 M8.0 Pingluo earthquake.

关键词： helan mountains Yinchuan Basin Magnetotelluric 3D electrical structure The 1739 Pingluo earthquake

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Omni-Directional Distribution Patterns of Montane Coniferous Forest in the helan mountains of China

引用

Journal of Mountain Science 2013年第5期10卷 724-733页

作者： PANG Yu ZHANG Bai-ping ZHAO Fang YAO Yong-hui ZHANG Shuo QI Wen-wen State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

Slope aspect has significant effect on the development and distribution of montane forest, especially in arid and semiarid regions. This paper, using SPOT5 images and 1：5o,ooo DEM, digitally extracts and analyzes the spatial information of montane coniferous forest （mainly Qinghai spruce）, and thereby explores how the upper and lower limits and the altitudinal range of coniferous forest vary and how the area of coniferous forest is related with annual insolation with all aspects in the helan mountains. The results show that： 1） In the eastern flank, the lower limit of coniferous forest is between 1,6oo m and a,ooo m a.s.l., and the upper limit between 2,800 m and 3,ooo m a.s.1.; in the western flank, the lower limit of coniferous forest is between a,ooo m and 2,300 m a.s.l., and the upper limit between 9,80o m and 3,1oo m a.s.1.2） The altitudinal ranges of coniferous forest are 8o6-1,435 m, 438-1,14o m for eastern flank and western flank, respectively. 3） The area of coniferous forest takes on a normal distribution with aspect, and it has a close relationship with annual insolation. This distribution model developed in this paper quantitatively reveals the significant effect of slope aspect on the distribution of coniferous forest in arid and semi-arid land.

关键词： Arid region helan mountains Qinghaispruce (Picea crassifolia) Aspect effect Coniferousforest Normal distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tourism resource assessment and spatial analysis of wine tourism development： a case study of the eastern foothills of China＇s helan mountains

引用

Journal of Mountain Science 2018年第3期15卷 645-656页

作者： WANG Lei LIU Jia-ming WANG Ling-en ZHU He LIN Jing Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China College of Humanities Ningxia University Yinchuan 750021 China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

The reasonable development and utilization of mountainous regions closely relates to local economic development and ecological security. The wine production region in the eastern foothills of the helan mountains in Ningxia, Ningxia Hui Autonomous Region, with its excellent terroir, is emerging as one of China's three major geographical attractions. Based on surveys of tourism resources and spatial analysis for this wine producing region, we propose a highly representative and practicable path for wine tourism development. Based on China's national standard in Classification, Investigation and Evaluation of Tourism Resources(GB/T 18972-2003), which recommended the types and grades of tourism resources in one area, we conduct an analysis of resource characteristics and the current state of development. Using Arc GIS software, spatialautocorrelation analysis, average nearest neighbor analysis, as well as clustering and outlier analysis, we are able to derive the spatial distribution characteristics of tourism resources. Our survey showed that tourism resources in this area are relatively abundant and have good quality and clear combination advantages. Nonetheless, there are resources shortage for wine tourism and poor integration of wine production with the tourism industry. Regarding the spatial distribution of resources, we revealed the current states of and issues surrounding regions with concentrated resources, as well as characteristics of this clustering. Finally, we proposed a development path for wine tourism in this region based on the five dimensions of management mode, industrial path, product development, spatial optimization, and market development.

关键词： Development path helan mountains Resource assessment Wine tourism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Feeding habitats of blue sheep(Pseudois nayaur)during winter and spring in helan mountains,China

引用

Frontiers in Biology 2007年第1期2卷 100-107页

作者： LIU Zhensheng WANG Xiaoming LI Zhigang CUI Duoying LI Xinqing School of Life Science East China Normal UniversityShanghai 200062China College of Wildlife Resources Northeast Forestry UniversityHarbin 150040China helan Mountain National Nature Reserve Yinchuan 750021China

The feeding habitat selection of blue sheep(Pseudois nayaur)was studied by direct observation method in the helan mountains,China during winter(from Novembe r to December)and spring(from April to June)from 2003 to *** established 25 line transects to collect information on feeding habitats used by blue *** sheep in the study area preferred mountain savanna forests,a habitat dominated by Ulmus glaucescens,with medium tree density(5 individuals/100 m^(2)),higher shrub(>1.3 m),higher food abundance(>50 g),moderate distance to human disturbance(100 g),moderate altitude(<2000 m),moderate distance to water resource(<500 m),and medium hiding cover(50%-75%)during *** of the feeding habitats by sheep showed a significant difference in vegetation type,landform feature,dominant tree,tree height,shrub density,distance to the nearest shrub,food abundance,slope direc-tion,slope degree,distance to water resource,and hiding cover between winter and *** of principal com-ponents analysis indicated that the first principal component accounted for 24.493%of the total variance among feeding habitat variance during winter,with higher loadings for vegetation type,dominant tree,tree height,distance to the nearest tree,shrub density,shrub height,altitude,distance to water resource,and distance to human *** spring,the first principal componen

关键词： blue sheep Pseudois nayaur habitat selection principal components analysis helan mountains

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Classification and distribution of Comastoma (Gentianaceae) in helan mountains in China by floristic, ecological and geographical approaches

引用

Forestry Studies in China 2007年第2期9卷 147-151页

作者： Zhang Xin Zhao Yi-zhi Zhang Zhi-xiang College of Biological Sciences and Biotechnology Beijing Forestry University Beijing 100083 P. R. China College of Life Sciences Inner Mongolia University Huhhot 010021 P. R. China

Four species of the Comastoma genus （Geianaceae） in helan mountains between Inner Mongolia and Ningxia Province in China have been recognized by morphological and geographical taxonomy. These four species are C. falcatum （Turcz.） Toyokuni, C. polycladum （Diels et Gilg） T. N. Ho, C. tenellum （Rottb.） Toyokuni and C. acutum （Michx.） Y. Z. Zhao et X. Zhang. Among them, C. tenellum （Rottb.） is a new recorded species and C. acutum （Michx.） Y. Z. Zhao et X. Zhang is a new combination. The floristic, ecological and geographical distribution of each species was analyzed and then a new key of Comastoma in helan mountains and the distribution maps have been generated, which will provide a reference for the revision of this genus and the analysis of the .flora in helan mountains. Key words Comastoma, classification, distribution, helan mountains

关键词： Comastoma classification distribution helan mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Winter diets and habitat selection of sympatric blue sheep(Pseudois nayaur) and red deer(Cervus elaphus) in helan mountains,China

Winter diets and habitat selection of sympatric blue sheep(P...

引用

第七届全国野生动物生态与资源保护学术研讨会

作者： Zhensheng Liu~(1,2),Zhicheng Yao~1,Liwei Teng~(1,2) (College of Wildlife Resources,Northeast Forestry University Harbin China)

The habitat selection and diet composition of blue sheep(Pseudois nayaur)and red deer (Cervus elaphus)in helan mountains,in China,were examined from November 2003 to February *** the overlap in habitat that was partly,habitat use between blue sheep and red deer separated *** sheep preferred montane savanna,with high degree of slope,further distance to water resource and bare *** red deer selected winter habitat with montane conifer forest,with flat slope,less distance to water resource,further distance to human disturbance and further distance to bare *** analysis was used to study the diet composition of the two *** diet of blue sheep was significantly different from that of red deer for proportions of forage *** sheep fed primarily on shrubs(36.7%)and graminodis (23.1%),while the diet of red deer was dominated by shrubs(43.6%),followed by tree category (25.6%).Contrary to blue sheep,red deer chose to avoid foraging most herbaceous plant.

关键词： habitat selection diet composition Pseudois nayaur Cervus elaphus winter helan mountains China

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：