| Forest density is the basic index of forest community structure and the main factor that can be controlled artificially in the process of forest cultivation.By controlling the density of forest stand,the forest stand can be optimized,the species structure can be improved,the growth of reserved wood can be promoted,and the vegetation growth conditions under the forest can be improved,which is conducive to the improvement of community diversity and stability.It is of great significance to reveal the relationship between forest structure and function to study the deterministic effect of natural forest density on the growth of forest stand reserved wood and undergrowth vegetation,it is also the basis of forest division structure adjustment technology in the process of forest cultivation and management.In this paper,the natural larch forest and undergrowth vegetation of north China larch were studied in taipinggou district,baiqiang forest farm,wutai mountain,the method of field investigation and comparative analysis of multi-density sample was adopted,the effects of different forest density on the natural forest of larch and its regulation mechanism in north China were revealed.Research results show that:(1)The change of forest density has significant influence on the growth of tree chest diameter and canopy width,the response of tree height growth to density change was not significant.The change of forest density has a significant effect on canopy-chest ratio and high_longitude ratio.(2)The change of forest density can significantly change the species composition and species number of undergrowth vegetation.The vegetation under the north China larch natural forest in wutai mountain maintains a high level of species diversity within the density range of 896 plants/hm2-1216 plants/hm2. |
PDF Full Text Request