Analyses on quantitative characteristics and regeneration regularity of species of gap in natural forest of Castanopsis fissa in Northern Fujian
Taking natural forest of Castanopsis fissa ( Champ. ex Benth.) Rehd. et Wils. in Shunchang County of Fujian Province as research object, and taking non-gap plot as control, according to gap area ( A) , four grades ( A<50 m2 , 50 m2≤A<100 m2 , 100 m2≤A<150 m2 and 150 m2≤A<200 m2 ) of plots were delimited. Distribution, composition and growth status of species in arbor layer, shrub layer and shrub-herb layer of gap and non-gap were investigated and counted. On this basis, the quantitative characteristics and regeneration response regularity of main species in gap and non-gap were compared and analyzed. The results show that arbor layers of gap and non-gap in natural forest of C. fissa have 54 and 35 species, respectively, common species is 28;shrub layers have 61 and 37 species, respectively, common species is 29; shrub-herb layers have 72 and 49 species, respectively, common species is 37.From important values of species in arbor layer and shrub layer, and density of species in shrub-herb layer, dominant species are C. fissa and Schima superba Gardn. et Champ., etc. in gap and non-gap. And differences in important value of dominant species in gap and non-gap are not obvious, in which, the important value and density of C. fissa are ranked first. From difference value of important value of dominant species in gap and non-gap, main dominant species (such as C. fissa and S. superba, etc.) in gap have unobvious regeneration response to gap, but other species have strong or moderate positive and negative regeneration responses to gap, and there are differences in different forest layers. From average regeneration density, gap area has a certain influence on regeneration of dominant tree species, in which, average regeneration densities of C. fissa and Castanopsis fargesii Franch. are the biggest with gap area of 150-200 m2, while those of Castanopsis carlesii ( Hemsl.) Hay., S. superba, Cyclobalanopsis glauca (Thunb.) Oerst. and Machilus chrysotricha H. W. Li are the biggest with gap area of 100-150 m2. However, there is no significant difference ( P=0. 867 ) in average regeneration density among tree species in gaps with different areas. It is suggested that in natural forest of C. fissa, species with unobvious regeneration response to gap are easily becoming main dominant species or constructive species, but gap area has no obvious effect on regeneration density of tree species. During the development process from gap to canopy, C. fissa is always in the dominant position in the forest.
natural forest of Castanopsis fissa (Champ. ex Benth.) Rehd. et Wils.gapdominant tree speciesimportant valuedensityregeneration regularity
NETL
NSTL
万方数据
维普
