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The Altitudinal Belts of Subalpine Virgin forest on *** Simulated by a Succession model

Journal of Mountain Science 2014年第6期11卷 1560-1570页

作者： CHENG Gen-wei SUN Jian SHA Yu-kun FAN Ji-hui Key Laboratory of Mountain Surface Process and Ecological Regulation Institute of Mountain Hazard and EnvironmentChinese Academy of Sciences Synthesis Research Centre of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences

How to accurately simulate the distribution of forest species based upon their biological attributes has been a traditional biogeographical *** gap models are very useful tools for examining the dynamics of forest succession and revealing the species structure of *** the present study,the GFSM(Gongga forest Succession model) was developed and applied to simulate the distribution,composition and succession process of forests in 100 m elevation *** results indicate that the simulated results of the tree species,quantities of the different types of trees,tree age and differences in DBH(diameter at breast height) composition were in line with the actual situation from 1400 to 3700 MASL(meters above sea level) on the eastern slope of ***,the dominant species in the simulated results were the same as those in the surveyed ***,the GFSM model can best simulate the features of forest dynamics and structure in the natural conditions of *** work provides a new approach to studying the structure and distribution characteristics of mountain ecosystems in varied ***,the results of this study suggest that the biogeochemistry mechanism model should be combined with the forestsuccession model to facilitate the ecological model in simulating the physical and chemical processes involved.

关键词： Subalpine forests Altitudinal belts Succession processes forest gap model

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Succession Features and Dynamic Simulation of Subalpine forest in the Gongga Mountain, China

引用

Journal of Mountain Science 2004年第1期1卷 29-37页

作者： CHENGGenwei LUOJi InstituteofMountainHazardsandEnvironment ChineseAcademyofSciencesChengdu610041China

The Gongga Mountain of eastern Tibet Plateau is a representative of the alpine regions with high peaks and deep valleys. Climate change over the last thousand years has controlled the dynamics of glacier and debris flow occurrence, which resulted in substantial changes in the mountainous environment. The authors surveyed the community structure of primary forests in Gongga Mountain and forest succession processes in woodland plots. The changing features in the subalpine environment are discussed in this paper. Tree species and sizes between the glacier shrinking areas and debris flow fans in Hailuogou Valley are compared. The pioneer species that settle in debris flow fans and the glacier shrinking areas are Salix spp. and Populus purdomii. Abies fabri and Picea brachytyla are the climax tree species. The succession process of primary vegetation in Hailuogou (2700 ~ 3200 m) can be divided into four stages: Slash surface (20~ 200 yr) Salix-Populus seeding community (10 ~ 30 yr) Populus-Salix sapling community (30 ~ 100 yr) Populus-Abies mixed community (50 ~ 100 yr) Abies-Picea climax In a natural and undisturbed environment, trees compete for light, water and nutrients. Disaster disturbance in mountains is a very important driving factor for regeneration of woody plants. Repeated destruction of forests by glacier movement or debris flows generated additional forest gaps that allow young plants to grow. In this study the Gongga forest Succession model (GFSM) was developed for simulation of forest community succession processes on different scales in Gongga Mountain. A soil succession module was added to the GFSM model to simulate soil formation and chemical element change of woodland. In order to represent major features of forests in Southwestern China, many field works has been done to identify ecological parameters of various trees in the subalpine region. On the basis of simulation of tree life history, the GFSM combines forest succession with soil change in bo

关键词： Gongga Mountain forest succession dynamic simulation forest gap model

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