| This paper mainly studied the stand structure and community characteristics of Chinese fir natural forest in Wuyi Moutain Nature Reserve,and provides a reference for the management of Chinese fir plantation and natural forest protection.The study area of this research is Masu in the Wuyishan Nature Reserve.The research object is the Chinese fir natural forest.The data analysis software includes Arcgis,Matlab,R studio,Excel.The results show:(1)The coniferous and broadleaf tree species mixure gradient of these 9 plots is 8:2,7:3,6:4,5:5,4:6.Cunninghamia lanceolata(Lamb.)Hook.,Phyllostachys heterocycla(Carr.)Mitford 'Pubescens',and Pinus massoniana Lamb.are the dominant species.The biodiversity of trees in the stands increase with the increase number of broad-leaved species.DBH is quite big in Cunninghamia lanceolata(Lamb.)natural forest in Wuyi Mountain,and the average DBH reaches the medium-diameter class.The average DBH of the Cunninghamia lanceolata(Lamb.)Hook.reaches the large-diameter class or giant large-diameter class,but the distribution of DBH is disperse.The diameter distribution of the stand is in the typical shape of inverted "J" and the combination of inverted "J" shape with a single peak or a bimodal peaks shape.Except for plot No.4,the q values of each plot are distributed within the range of 1.2-1.7.The Weibull three-parameter model has the best fitting accuracy for the stand diameter structure.The vertical structure of stands have the trend to be bad when Phyllostachys heterocycla(Carr.)Mitford'Pubescens' exist.(2)6 or 7 adjacent trees in the stands have a high proportion.This stand has a good mingling condition,lightly clustered,good vertical distribution,but with low open degree,Cunninghamia lanceolata(Lamb.)Hook.has higher competition in stands.The competition ability of Pinus massoniana Lamb.in the plots are the best.Without artificial interference in over-developed forest stands,the spatial structure will show a trend of deterioration.(3)The regeneratoin of the stands are generally poor and aggregated,and human activities have a significant impact on the it.The seedlings of broadleaf species are better than Cunninghamia lanceolata(Lamb.)Hook..From the ecological point of view,the volume of dead wood in this stand is insufficient and the overall distribution is uneven.The tree number and spatial distribution of the big trees had no significant effect on the formation of the dead trees.The number and spatial distribution of the large trees and dead trees had no significant effect on regeneration.(4)The community status of the stand is unstable,the overall association is poor,and the internal relationship of the stand is loose.The number of no significant associated or weak associated pairs have high proportion,and the proportion of significant or no association pairs have low proportion.The combination of the most significant positive correlations in the stand is the combination of large trees and small trees.Cunninghamia lanceolata(Lamb.)Hook has significantly negative association with Phyllostachys heterocycla(Carr.)Mitford 'Pubescens' and some species from Fagaceae and Lauraceae.(5)When the proportion of coniferous and broad-leaved trees is 7:3,the stand structure,interspecific association,number of dead trees,and regeneration are the best.These factors decrease with the decrease or increase of conifer species proportion in stand.Meanwhile,the existence of Phyllostachys heterocycla(Carr.)Mitford 'Pubescens',spatial structure of stands and regeneration turns to be bad.The fir-pine-bamboo mixture type could create the best of Chinese fir and broadleaf species mixed forest. |
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