Relationship between the spatial distributions of dominant arbor species and environmental factors of Excentrodendron hsienmu community in Southwest Guangxi, China
Revealing the relationships between plant distributions and environmental factors is one focus of plant community ecology.Excentrodendron hsienmu is the endemic species in tropical limestone area,and the second national key protected plant of China,and it widely distributes in the karst mountains of Southwest Guangxi,China.Exploring factors effecting the domiant arbor trees distribution has significant implication for effectively protecting the E.hsienmu population in the study area.Important value of the main arbor species and eight environmental factors were measured based on field surveys in the karst mountains of Southwest Guangxi.And then,correlation analysis was used to detect the relationships between topographic and soil factors.Canonical correspondence analysis (CCA) was used to explore the effects of environmental factors on the distribution of dominant arbor species.A total of 176 woody plant species with diameter at breast height ≥1.0 cm,and tree height ≥1.5 m were recorded,belonging to 50 families,128 genera.E.hsienmu was absolutely dominant in tree layer,while Orophea anceps,Garcinia paucinervis,Walsura robusta,and Sterculia nobilis were the main accompanying species.Correlation analysis showed elevation was very significantly positively related to soil organic matter and total nitrogen.Except for soil pH,relationships between all soil factors were markedly positive.Result of CCA revealed that soil total potassium had the most significantly effect and the soil total phosphorus had the second on the distribution patterns of dominant arbor species,while slope aspect and degree also played important roles in the spatial patterns of them.This study revealed the main factors influencing on the spatial patterns of dominant arbor trees of E.hsienmu community,and provides scientific information for the vegetation restoration in the study area.
community ecologyE.hsienmukarst mountainCCAsoil fertilitytopography
国家科技期刊平台
NSTL
万方数据
维普
