韶关市国有林场杉木林分结构与大径材培育关键技术研究OA

To investigate the current status and optimization pathways of large-diameter Chinese fir(Cunning-hamia lanceolata)cultivation in state-owned forest farms in Shaoguan,by establishing sample plots separately for medium-aged and nearly-mature Chinese fir stands in typical distribution areas,the growth structure,density regulation effect and large-diameter cultivation potential of Chinese fir stands of different age groups under different management measures were systematically investigated and analyzed.The results showed that density control was the key factor affecting stand productivity and the formation of large-diameter timber,and the optimal densities for medium-aged stands and nearly-mature stands were 1 550 and 950 ind./hm2,respectively;scientific thinning could significantly optimize the diameter class structure and increase the proportion of large-diameter timber.Specifically,after reasonable density regulation,the proportion of large-diameter timber in sample plots JS2 and ZL4 reached 53.7%and 30.4%respectively.However,problems such as differences in site conditions,long management cycles,and extensive technical measures remain the main bottlenecks restricting the large-scale cultivation of large-diameter timber in this region.It was suggested that collaborative promotion should be carried out from the aspects of improving the technical system,innovating management modes,and strengthening policy support,so as to enhance the cultivation efficiency and the level of sustainable resource utilization of large-diameter Chinese fir in Shaoguan.