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Effects of spatial aggregation on Forest Landscape Model Simulation in Northeastern China

Transactions of Tianjin University 2009年第3期15卷 178-186页

作者：周宇飞贺红士布仁仓金龙如李秀珍 Institute of Applied Ecology Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences School of Natural Resources University of Missouri-Columbia

Issues of scale and aggregation become important when large range of space and time scales is considered in landscape ***,identifying appropriate levels of aggregation to accurately represent the processes and components of ecological systems is challenging.A raster-based spatially explicit forest landscape model,LANDIS,was used to study the effects of spatial aggregation on simulated spatial pattern and ecological process in Youhao Forest Bureau of the Small Khingan Mountain in Northeastern *** model was tested over 500 simulation years with systematically increased levels of spatial *** results show that spatial aggregation significantly influences the simulation of fire disturbance,species abundance,and spatial *** fire regime was relatively insensitive to grain size between 30.m and 270.m in the *** aggregation from 300.m to 480.m dramatically decreased fire return interval(FRI) and increased mean fire ***,species abundance and its aggregation index(AI) remained higher level over simulation years at the fine-grained level of spatial aggregation than at coarser *** addition,the simulated forest dynamics was more realistic at finer *** results suggest that appropriate levels of spatial aggregation for the model should not be larger than 270m.

关键词： scale spatial aggregation LANDIS fire disturbance succession spatial pattern Northeastern China

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The Analysis of spatial-Temporal Evolution of City Accessibility Based on Highway Network in Henan Province in China

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Journal of Transportation Technologies 2021年第2期11卷 296-310页

作者： Mingting Ba Hongling Meng Kaiguang Zhang Yanmin Sun School of Geography and Tourism Zhengzhou Normal University Zhengzhou China

Accessibility is an important tool to evaluate the maturity of a regional traffic network structure which describes the traffic convenience in the traffic network. The paper defines a new accessibility index by using the resident population weighted average value of the sum of inverse of the traveling time distance and time threshold coming from ordinary traffic network, and then uses this accessibility index to analyze the spatial-temporal characteristics of Henan highway network, as well as its evolution patterns from 2005 to 2020. The results show that with the expansion and improvement of Henan highway network, city accessibility level has been significantly improved, spatial convergence is obvious, the cities in the north central are always High-High aggregation area, the cities in the south are always Low-Low aggregation area, gradually forming the characteristics of Northwest high and Southeast low, relative balance between East and West. There is some non-conforming phenomenon in highway mileage growth and improvement of the city accessibility levels, but this situation is being weakened, the highway network layout is gradually rationalized, the spatial distribution of city accessibility and that of population are beginning to converge.

关键词： Highway Network Accessibility Inverse of Time Distance spatial Distribution spatial-Temporal Evolution spatial aggregation Henan Province

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