| The terrain of the Pingshan gneiss mountainous area in Hebei Province is broken,the rock is weathered,and the vegetation is sparse.In the long-term rainwater erosion process,various micro-topography is formed.This paper divides the regional micro-land type and studies its main vegetation allocation mode.In order to provide theoretical and technical support for vegetation restoration in the region.Taking the Pingslian gneiss mountainous area as the research object,a total of 171 sample plots were set up in Guyu Town,Xiaojue Town,Xiazhang Town,Gangnan Town,Sujiazhuang Town and Demonstration Zone of Pingshan County.The micro-strategic factors and vegetation community related indicators in the plots were selected from the micro-strategic factors using the quantitative analysis of principal component analysis and stepwise regression analysis,and the dominant factors were selected to form the micro-place type.One-way analysis of variance was used to analyze each type.According to the important value,the quantitative relationship of the above-ground micro-ground species was selected according to the important values,and the vegetation allocation pattern of each micro-land type was proposed to fully understand the site characteristics of the area and artificially promote the Pingshan gneiss mountain area.Vegetation near natural restoration provides theoretical basis and scientific support.The research conclusions are as follows:(1)Set up 171 micro-topography squares(3 m×3 m)in 6 areas of Pingshan County,and investigate the micro-topography,slope direction,slope,slope position,soil thickness,soil hardness and rock exposure of each sample.8 micro-land factors such as rate and rock weathering degree.The research shows that the micro-topography,slope position,soil thickness and soil hardness are the four dominant factors of the micro-geotype in the region;the site is divided into geological hills according to the local site conditions.In the site type group,cluster analysis was used to combine the dominant factors,and 20 micro-grid types were classified in the Pingshan gneiss mountainous area.(2)There are 57 species of plants on 20 micro-propagation types,and there are fewer arbor species,mainly shrubs,including 10 species of trees,6 species of shrubs,41 species of herbaceous species;the average height and coverage of vegetation are different.The difference in micro-grounding is large,especially in the mean height.The micro-propagation types with better conditions are micro-living I,VI,VII,VIII,IX,X,XI,XVI,and their average height and coverage range from 73.38 cm to 152.92 cm,62%to 87.4%;The micro-grounds are micro-sites ?,?,?,??,??,??,??,and their average height and coverage range from 65.5 cm to 86.94 cm,33.5%to 66.54%;the micro-grounds with poor conditions are micro-places ?,?,??,??,??,the average height and coverage ranged from 38.13 cm to 61.87 cm,27.43%to 37.97%.The average height and coverage of micro-ground vegetation with good conditions were moderately above ground.1.19 to 1.76,1.31 to 1.85 times,which is 1.92 to 2.47 and 2.26 to 2.3 times the condition on the ground.The diversity indices of shrubs and herbaceous communities in different micro-grounds were different.The diversity index of herbaceous vegetation was higher than that of shrub vegetation.According to the vegetation configuration in each micro-ground sample,the largest proportion was selected.As the best vegetation configuration on the micro-ground,the results showed that the shrub vegetation configuration accounted for up to 65%of the total configuration,and the arbor-containing configuration accounted for 25%of the total configuration;the 20 species of micro-grounded main vegetation had 32 species,of which shrub 6 There are 26 kinds of herbs,and almost all of them have important values of shrubs larger than herbs.According to important values,the dominant plants in each micro-land habitat are determined,and finally the optimal vegetation configuration for each micro-ground is formed. |
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