Subjects: Biology >> Botany >> Applied botany submitted time 2023-09-20 Cooperative journals: 《广西植物》
Abstract： The spatial structure evolution of forests in karst areas is a key scientific issue in global forest research. In order to explore the dynamics of spatial structure in karst evergreen and deciduous broad-leaved forests, a study was conducted in the Guolin National Nature Reserve, focusing on a fixed monitoring plot of 2 hm2. Based on data from three surveys conducted in 2007, 2012, and 2017, the dynamics of community spatial structure were analyzed using the spatial structure parameters: individual distribution index (Wi), mixing degree (Mi), and size-number ratio (Ui). The results were as foloows: (1) The univariate distribution of spatial structure parameters revealed that the forest structure gradually shifted towards a slightly clumped distribution state as the stand age increased between 2007 and 2017. The mixing degree was at a level of strong mixing and showed a tendency towards extreme mixing. In terms of the size-number ratio, the stand exhibited a moderate state, shifting towards subdominance as the stand grew. (2) The study of spatial structure for different diameter classes of trees showed that the angle scale, size-number ratio, and mixing degree of trees in diameter classes 1~15 cm gradually increased with stand growth. As the diameter class increased, the values of the size-number ratio showed a decreasing trend while the mixing degree showed an increasing trend. (3) The study of spatial structure for dominant tree species revealed that, during the ten-year period from 2007 to 2017, all five dominant tree species groups exhibited a slightly clumped distribution. The size-number ratio showed a tendency towards subdominance and a moderate distribution state, while the mixing level was at a high degree and gradually shifted towards extreme mixing. The study concludes that the karst evergreen and deciduous broad-leaved forest in Guolin currently exhibits a slightly clumped distribution, a strong degree of mixing, and a tendency towards subdominance. The community is relatively stable, the stand regeneration is in good condition, and the forest is gradually transitioning towards a climax community. The analysis of the dynamic changes in vegetation structure in karst evergreen and deciduous broad-leaved forests is of great significance for predicting the future development and changes of forests.
Hits
Hits
Downloads
Comment