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Relationship between settlements and topographical factors:An example from Sichuan Province,China

Journal of Mountain Science 2018年第9期15卷 2043-2054页

作者： XI Chang-bai QIAN Tian-lu CHI Yao CHEN Jie WANG Jie-chen Department of Geographic Information Science Nanjing UniversityNanjing 210023China Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Terrain can influence the spatial distribution of settlements. Studies on the terrain characteristics of settlements can help to understand the effects of the environment on human activities. This paper provides a quantitative analysis of the relationship between settlements and topographical factors. A statistically significant sample of residential locations and ASTER GDEM V2 were used to investigate terrain traits and settlements distributions. We selected eight topographical factors and introduced a practical concept, distributive entropy, into assessing the aggregation extent of the settlements' spatial distribution. The study showed that topography varies within the study area, and distributive entropy indicates that settlements have distinctive distribution tendency in statistic approach. According to the results of this study, mountain inhabitants prefer to settle in valleys. Additionally, with distributive entropy, residential suitability was divided to three levels: suitable, normal, and unsuited. The results showed that suitable area is small in Sichuan Province, accounting for 8.2%～29.9%; however, unsuited area is large, accounting for 33%～63.3%.

关键词： Settlement topographical factor Distributive entropy Spatial pattern GeographicalInformation System

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Spatial distributions of intra-community tree species under topographically variable conditions

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Journal of Mountain Science 2023年第2期20卷 391-402页

作者： LV Ting ZHAO Rong WANG Ning-jie XIE Lei FENG Yue-yao LI Yao DING Hui FANG Yan-ming Co-Innovation Center for Sustainable Forestry in Southern China Key Laboratory of State Forestry and Grassland Administration on Subtropical Forest Biodiversity ConservationCollege of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China Research Center for Nature Conservation and Biodiversity State Environmental Protection Scientific Observation and Research Station for Ecology and Environment of Wuyi MountainsState Environmental Protection Key Laboratory on BiosafetyNanjing Institute of Environmental SciencesMinistry of Ecology and EnvironmentNanjing 210037China

Growing public awareness of the importance of protecting biodiversity requires the development of forest practices that increase the complexity of stand *** the ecological processes of different forest vegetation provide insights into community coexistence *** this paper,the spatial patterns of three different communities,evergreen broadleaf forest,deciduous broadleaf forest,and mixed needleleaf and broadleaf forest at ***,China,were quantified with four structural parameters,the mingling index,the uniform angle index,the diameter dominance index and the crowdedness *** trees with a diameter at breast height of more than 5 cm were *** analyses highlighted that most trees in the three communities were extremely dense and slightly clumped,with a moderate size differentiation and high mixed *** mixed needleleaf and broadleaf forest,the distribution pattern of tree species was better than the other two ***,spatial patterns in mixed needleleaf and broadleaf forest exhibited a strong stability-effect,that is,the stand had a suitable environment for the stable survival of the *** the increasing of elevation,the degree of the mingling index and the crowdedness index increased,however,there was no influence on the uniform angle index and the diameter dominance ***,at the same elevation,four structural parameters of shady slope were larger than that of sunny *** we found the relationship between stand spatial structure and environment factors had important influence on forest *** work contributes to the knowledge of population structure,and further provide theoretical basis for the sustainable development of forest resources and protecting biodiversity of Huangshan *** future studies,it is necessary to explore the limiting factors of community spatial distribution by combining species diversity and functional traits.

关键词： Intra-community Stand spatial structure Comprehensive evaluation topographical factor Forest vegetation

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