Effects of Coverage Levels of Ageratina adenophora on the Community Structure and Species Diversity of Undergrowth Plants in Secondary Forests
Study on the impact of population diffusion and spread of Ageratina adenophora on the community struc-ture and species diversity of understory plants in secondary forests.Taking the invasion of A.adenophora into the un-derstory of secondary forests at the edge of Gaoligong Mountain Nature Reserve as the research object,a combination of field ecological investigation and data statistical analysis was used to investigate the impact of different A.adenophora coverage on the structural characteristics and species diversity of understory plant communities in secondary forests.Research has found that as the coverage of A.adenophora increases,the dominant species in the understory of secondary forests gradually evolve from Axonopus compressus,Arthraxon hispidus and Polygonum multi-florum to A.adenophora,A.hispidus and Setaria viridis;At the same time,the plant density,species richness index,species diversity index,and species evenness index of understory plants significantly decreased,while the plant height,tiller number,and aboveground biomass of A.adenophora significantly increased.A.adenophora,with its rap-id growth,strong tillering ability,strong reproductive ability,and wide propagation distance,can quickly grow once planted,seize the opportunity in the ecological niche,and then further exclude other herbs and shrubs through its naturally secreted allelopathic substances,forming a large area of monodominant communities,leading to a signifi-cant reduction in understory species diversity and causing great harm to forest ecosystems.
secondary forest landAgeratina adenophoracommunity structurespecies diversitycharacteris-tics of population quantity structure
万方数据
维普
