Study On The Stand Spatial Structure And Species Relationship Of Natural Castanopsis Fissa Community In Northern Fujian

In natural castanopsis fissa concentration distribution of Shunchang Northern Fujian,adjacent lattice method was used to set up two experimental research plots,and the community forest was taken for kotoki location investigation.On the basis of kotoki investigation date,the community structure features of natural castanopsis fissa had been described reasonably,and species diversity of different levels had been analyzed.In this community,castanopsis fissa,Castanopsis carlesii,Sloanea sinensis,Schima superba,Alniphyllum fortunei,Quercus acutissima,Fagus engleriana,Cyclobalanopsis glauca were advantage species.Meanwhile,in the community species composition,castanopsis fissa accounted for leading status,and forest environment was decided by this species.Mixed degrees,neighborhood comparison,corner scale was used to analyze community forest space structure.The size differentiation distribution frequency of advantage,subdominant,doctrine,disadvantage,absolute disadvantage in forest were uniform,and the overall was in doctrine level.Average neighborhood comparison of each species had distribution in 0?1,it meant DBH size differentiation of each species in community existed big difference.Average corner scale of stand was 0.582,and horizontal pattern demonstrated gathering distribution.Average mixed degree was 0.717,so it was in between moderate and strength mixture,and frequency distribution was mainly in strength and intensity mixture.Spatial segregation degree of each tree was higher.Natural castanopsis fissa had formed higher mixed complex community with different tree species,but it haven't reached climax community at present.Hegyi competition index was adopted to analyze community species competition,but only castanopsis fissa,Castanopsis carlesii,etc.had species competition,the competition value maximum was castanopsis fissa and it had a fierce competition with its common associated species.Species competition index had an obviously negative related relationship with object wood DBH size.Competition index gradually decreased with increment of object wood DBH size,thus power function could be a great way on relationship of competition index and object wood DBH size for return analysis.Point pattern was used to analyze the spatial distribution pattern of community,on the whole,it showed from gathering distribution to random distribution then to uniform distribution,and aggregation degree decreased with increment of space scale as a whole.Most dominant species showed a fine-scale spatial aggregation and large scale space random or uniform distribution.What's more,most of the scale-space was random distribution.In most scale-space,castanopsis fissa was uncorrelated with other dominant species,and even tended to be negative correlation,so positive correlation was rarely.Analysis on spatial structure of castanopsis fissa and relationship between species provided references and supports for using natural forest and resources reasonably and efficiently,as well as realizing sustainable development of forest.