黔中天龙山典型喀斯特次生林地上生物量与环境因子的关系

In order to explore the relationship between the aboveground biomass of karst secondary forestland and environmental factors, we took the typical secondary forest sample of karst Tianlong mountainin Puding County, Central Guizhou as the research object, adopted the aboveground biomass model ofsingle species and different diameter groups to calculate the biomass of dominant species and community,used the spatial distribution map to describe the spatial distribution of environmental factors andaboveground biomass of community, and used the correlation test (person) General linear model (GLM)and redundancy analysis (RDA) to discuss the relationship between community, life form, species aboveground biomass and environmental factors. The results were as follow: (1) The total abovegroundbiomass of karst secondary forest group was 106.94 tm-2, and the aboveground biomass of dominantspecies accounts for 91.77% of the whole sample plot. The aboveground biomass of evergreen plants washigher than that of deciduous plants. The aboveground biomass of Lithocarpus confinis and Platycaryastrobilacea accounted for the highest proportion in the community, 34.23% and 34.37% respectively; (2)The spatial distribution of rock exposure rate showed obvious upper and lower gradient difference, theupper slope was significantly greater than the lower slope, and the spatial distribution of slope and soilthickness was discontinuous and has no obvious law; (3) There was a significant positive correlationbetween aboveground biomass and soil thickness, and their spatial distribution tends to be consistent. Soilthickness was the main influencing factor of aboveground biomass of the community, and the influence ofrock exposure rate and slope on aboveground biomass of the community was low; (4) For different lifeforms, the influence of rock exposure rate on aboveground biomass was the highest, and the influence ofsoil thickness and slope on evergreen plants was greater than that of defoliation; (5) For different species,the correlation between environmental factors and aboveground biomass was complex. Most species werepositively correlated with soil thickness. Platycarya strobilacea and Zanthoxylum dimorphophyllum werepositively correlated with rock exposure rate and slope respectively. In conclusion, the vegetationrestoration of secondary forest in the study area is slow, and soil thickness is the main influencing factorof aboveground biomass of the community. However, for different life forms and species, the response ofaboveground biomass to the environment will be affected by biological factors such as life formdifferences, species habitat preferences and interspecific relationships.