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Effects of Forest Roads on Habitat Pattern for Sables in Da Hinggan Mountains, Northeasten China

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Chinese Geographical Science 2014年第5期24卷 587-598页

作者： LI Yuehui WU Wen XIONG Zaiping HU Yuanman CHANG Yu XIAO Duning State Key Laboratory of Forest and Soil Ecology Institute of Applied Ecology Chinese Academy of Sciences University of Chinese Academy of Sciences

The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sables(Martes zibellina), one of rodents within national first-class protected species, when roads are considered in Huzhong area in Da Hinggan Mountains, northeastern China. Employing published literatures about behavior ecology, aerial photographs and forest stand maps, we classified the study area into three habitat types including best-suitable, suitable and unsuitable habitats based on sable habitat requirements at the landscape scale including four variables derived from forest source map with attribute database. Results indicated the loss and significant fragmentation of best-suitable habitat and home range habitat when roads, especially 150 m avoidance distance of roads, were considered. The roads reduced and fragmented highly suitable habitats more significantly during earlier development period than the later development period. Additionally, the suitable area percentage increased with increasing distance to roads. This study helped to identify the suitable area for sables and location of sable population. Also, this study suggested the passage construction and road management involving road closure and removal will reduce the fragmentation functionally and benefit the sable population.

关键词： forest road sable habitat pattern buffer analysis Da Hinggan Mountains

A comparative study of spatiotemporal patterns of urban expansion in six major cities of the Yangtze River Delta from 1980 to 2015

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Ecosystem Health and Sustainability 2018年第4期4卷 1-21页

作者： Chenyu Fang Shuqing Zhao College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeiingChina

Introduction:China has been experiencing dramatic urbanization in parallel with its eco-nomic boom over the past three to four *** Yangtze River Delta(YRD),as the most important engine in the Chinese economy,has pioneered in the rapid urbanization road of China since the late *** quantifed and compared the spatiotemporal patterns of urban expansion in six major cities in the YRD urban agglomeration between 1980 and ***:We found that Sha nghai,Nanjing,Hangzhou,Wuxi,Suzhou and Ningbo expanded by an annual rate of 5.4%,5.9%,9.6%,7.4%,6.3%and 8.1%from 1980 to 2015,suggesting larger cities generally possess lower growth *** patterns of urban expansion are defined by multiple forces including physical conditions and urban planning and *** urbanization processes in Shanghai,Nanjing and Hangzhou gen-erally conformed with the difusion-coales cence theory as the number of patches(NP)and patch density(PD)of urbanized land peaked and the proportion of leapfrogging urban growth type began to decrease around 2005,which separating their urbanization processes into difusion phase before and coalescence phase *** contrast,Suzhou,Wuxi and Ningbo is either in the diffusion or in the transition phase from diffusion to coalescence,not showing temporal dynamics of diffusion-coalescence phase across the study period,which might be related to the fact that the urban areas in these three cities were more dispersive in space than that of other ***:These spatially explicit findings are the fundamental cornerstone to understand the characteristics,drivers and consequences of urban expansion in the urban agglomera-tions,and then detect the feasibility of general urbanization theories and further advance in-depth theoretical understanding to support a sustainable urban future.

关键词： Urban growth type landscape metrics remote sensing buffer analysis directional variability urban agglomeration

GIS-BASED STUDY ON THE RELATIONSHIP BETWEEN EARTHQUAKES AND ACTIVE FAULTS IN SHANGHAI AND ITS ADJACENT OFFSHORE REGION, EAST CHINA

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Geotectonica et Metallogenia 2005年第1期29卷 34-43页

作者： WUNingfen ZHOUZuyi LAOQiuyuan LIUChangsen LaboratoryofMarineGeology TongjiUniversityShanghai200092China SeismologicalBureauofShanghai Shanghai200062China

The relation between earthquakes and active faults in Shanghai and its adjacent offshore region is quantitatively evaluated using GIS-based buffer and overlay analysis techniques. Statistics on the distance from the epicenter of an earthquake to its nearest active fault suggest that most earthquakes in the study area occurred within 10 to 20 km of major active faults. The strikes of active faults have significant influences on the occurrence of earthquakes. The NE-NNE-striked faults are less active than NW-NNW- or EW-striked faults. Along the NW-NNW- or EW-striked faults, the frequency of earthquakes is much higher than that along NE-NNE-striked faults. The time of fault activity has some degree of influence on the earthquakes. The newer the faults, the higher the frequency of earthquakes within the zone of the faults.

关键词： earthquake active fault buffer analysis overlay analysis GIS Shanghai

Research on the Relationship between Active Faults and Earthquakes in the Junction Area of the China North-South Seismic Belt and Central Orogenic Belt Based on GIS

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Earthquake Research in China 2010年第4期24卷 432-444页

作者： Liu Feng Zhang Jiasheng Huang Xiongnan Niu Xianglong Institute of Geology China Earthquake Administration Beijing 100029 China

Research on the relationship between faults and seismicity in the junction area of China's north-south seismic belt and central orogenic belt based on the Geography Information System (GIS) has been *** each of the 16 faults in this area,we build a 25km buffer zone and use overlay analysis to investigate the seismicity and its characteristics on each *** results unveil the main seismic faults as follows:the western segment of the northern-edge of the west Qinling fault,the southwestern segment of the Lixian-Luojiabao fault,the southeastern segment of the Lintan-Dangchang fault,the southwestern segment of the Wenxian fault,the Huya fault,and the Xueshan *** most active faults are the Huya and Xueshan faults,then the Tazang fault,the Lixian-Luojiabao fault and the northern piedmont of the Guanggaishan-Dieshan *** research zone can be divided into four areas according to focal depth,which gets deeper from north to *** profile of focal depth indicates the geometry and mechanical property of faults,and further reveals the movement model of eastward extrusion of the Tibetan plateau and southeastward escape of masses,thus providing basis for the protection against earthquakes and hazard mitigation in this area.

关键词： Active fault buffer analysis Spatial overlay analysis Seismicity Geography Information System (GIS)