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The Research Of Spatial Structure And Visual Control About Pinus Plantation Based On GIS

Posted on:2020-11-21Degree:MasterType:Thesis
Country:ChinaCandidate:Y B ZhouFull Text:PDF
GTID:2543305972455444Subject:Forest managers
Abstract/Summary:PDF Full Text Request
Shaanxi Huanglong moutain forest Area is located in the boundary of Huanglong County,Shaanxi Province.It is located in the intertwined zone of the Loess Plateau.It is adjacent to the Yellow River.It has four distinct seasons,abundant rain and abundant heat.It belongs to the typical semi-humid warm temperate continental climate type.This study takes the Pinus tabulaeformis forest in this forest area as the research object,based on the data of 45 pieces of Pinus tabulaeformis plantations and 12 Pinus tabulaeformis forests obtained from field surveys,using forest structure theory,mathematical statistics,entropy method and the GIS spatial analysis method was used to study the spatial structure and stand competition of Pinus tabulaeformis forests in Huanglong Mountain,and the simulated harvesting and visual expression of Pinus tabulaeformis plantations were carried out under the support of GIS.The main conclusions are as follows:In the horizontal pattern distribution,the origin affects the uniformity and aggregation degree of Pinus tabulaeformis forest.In terms of tree size differentiation,the slope direction affects the forestry competition intensity;the degree of tree crown congestion,the origin affects the Pinus tabulaeformis forest Canopy competition;in the mixed forest stand,the slope direction and the forest age will affect the degree of mixed forest stand.The natural near mature forest(NSS)on the sunny slope and the artificial near mature forest(ASS)on the sunny slope show a very low degree of mixedness.(2)By comparing the unary distribution of simple competition(Co)of 16 plots,it is easy to know that the simple competition is a discrete random variable distributed in [0,1].The biological significance is that the value is larger.The competition pressure of trees is also greater.According to the comparison with Hegyi’s simple competition index,the correlation between Co and DBH is significantly higher than that of Hegei index(p<0.001).Finally,the correlation between competition index and health level is analyzed.The results indicate that Co is more relevant to health levels.Co is an excellent stand spatial structure index,which depicts the competitive position of forest trees in the forest in a simple way.Because of the significant correlation with the health level of the stand,it can be a stand.Simulated tending provides reliable advice.(3)Through the simulation of typical plots,we can use the entropy method to evaluate the spatial structure of the four forest stands,and compare the spatial structure characteristics of natural forests and plantations to the spatial structure of the artificial forests.It is possible to adjust towards the spatial structure of the natural forest.The simulation tending can well control the degree of mixing and the entropy of the exponential distribution of various types of spatial structures,and make the spatial structure of the artificial forest close to the natural forest spatial structure.(4)Selecting a representative plot,based on the wood positioning data of the plot,combined with DEM and remote sensing data,using Arc Scene in Arc GIS to realize the visual simulation of the management of Pinus tabulaeformis.
Keywords/Search Tags:Pinus tabulaeformis plantation, Competing, Spatial structure, Etropy evaluation method simulated breeding, Quaternion distribution
PDF Full Text Request
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