Reaserch On The Regeneration Spatial Pattern Characteristic Of Natural Secondary Coniferous Forest Seedlings In Guandi Mountain

Natural regeneration of forests is one of the main methods of self-restoration of forest ecosystems and a natural biological process of reproduction of forest resources. From Guandi Mountain forest region, Larix principis-rupprechtii, Picea asperata, and the mixed forest of Picea asperat and Larix principis-rupprechtii included, this research studies on regeneration form, the growth and structural property, and pattern feature, comprehending the regeneration rules of newer species and seedling under its forest stand densityThe finding of the research shows,(1)When it comes to pure stand among Picea asperata at the sample plot, the density of regeneration seedling differs when the forest stand density is diverse. If the forest stand density increases, the regeneration density of newer species and seedling grows.The main newer species is Picea asperata seedling. The seasonal dynamics of newer seedling is distinct at the low sample plot, but it is hardly changed at the high sample plot. The regeneration space of newer seedling violates sharply at the low sample plot, but it violates slightly at the high sample plot. When the forest stand density in the sample plot is larger, the violation of spatial autocorrelation plays a leading role, and patchy distribution is relatively complex.(2) When it comes to pure stand among Larix principis-rupprechtii at the sample plot, the main newer species is Larix principis-rupprechtii. The amount of newer seedling of Larix principis-rupprechtii drops when the forest stand density raises.Though forest stand density is larger,the seasonal dynamics of newer seedling has slight impact on it.However, at those areas where forest stand density is smaller, its newer seedling at the sample slot shows significant process of its pattern dynamic. If the forest stand density is low at the sample plot,then spatial autocorrelation is the dominant in its process of spatial pattern violation. The higher the forest stand density is, the more complex its patchy distribution.(3) In the mixed forest of Picea asperat and Larix principis-rupprechtii, the main newer species is Picea asperata seedling but with a handful of Larix principis-rupprechtii seedling. The amount of newer seedling changes apparently at the sample plot of the high forest stand density. From the perspective of coefficient of variation at sample plot, if forest stand density is larger, the violation of newer seedling is relatively small. And the amount of newer seedling increases when the forest stand density is added. The space change of newer seedling gets smaller at the sparse forest stand, and its change is magnificently related to autocorrelation factor. The space change of newer seedling becomes tremendous at the intensive forest stand, and its change is major related to randomness factor. The patchy distribution becomes intricate while forest stand density enlarges.