不同采伐强度下龙竹林生态功能健康状况评价OA

In response to the potential decline in ecological function of Dendrocalamus giganteus forests after logging,this study selected 4 logging intensities(selective logging,1/3 clump logging,1/2 clump logging,and full clump logging)in southwestern Yunnan as research sites.Combining the community characteristics and habitat features of the Dendrocalamus giganteus forest,16 key indicators were selected from 4 dimensions:system vital-ity,system resilience,resistance,and soil conditions,to establish a comprehensive health evaluation index system for the Dendrocalamus giganteus forest.Principal component analysis and comprehensive index method were used to calculate the weights and health index(H),and the ecological function health status was evaluated based on five grades:excellent,healthy,sub-healthy,unhealthy,and diseased.The results show that the health indices of selective logging,1/3 clump logging,1/2 clump logging,and full clump logging are 6.68,7.15,8.44,and 4.18 re-spectively,with an average comprehensive health index of 6.61,indicating that the overall ecological function is in a healthy state.The 1/2 culm harvesting intensity shows significant advantages in leaf area index,litter thick-ness,biomass,soil erosion degree,and soil thickness,indicating the highest overall health level.In contrast,full culm harvesting performs significantly worse than other plots in terms of biomass,soil erosion degree,and spe-cies diversity,with the overall performance at the lowest level.For harvesting activities in D.giganteus forests,it is recommended to use 1/2 culm harvesting as the primary reference basis for designing a more scientific and reas-onable harvesting strategy.