甘肃西和锑矿生态破坏区优势物种生态位及种间联结性OA北大核心CSTPCD

Interspecific relationships among plants can reveal the characteristics of coexistence and succession laws of plant communities in mining-damaged ecosystems.This information is crucial for the restoration and management of the plant communities in mining areas.This study focused on the plant communities at antimony(Sb)ecologically damaged sites in Xihe County,Gansu Province,China.Based on ecological principles and methods,niche,variance ratios(VR),chi-square(χ2)test,interspecific association coefficient(AC),and Pearson correlation coefficient were used to analyze interspecific relationships.The results showed that 1)the plant species observed at the sites belonged to 90 species of 73 genera and 35 families,with Asteraceae and Fabaceae being the most prevalent families.The species in Sb mining-damaged ecological sites with the highest important values in the shrub and herb were Coriaria nepalensis(42.3%)and Imperata cylindrica(9.48%),respectively,while in the control sites,there were Cotoneaster horizontalis(10.6%)and Carex spp.(21.6%),respectively.2)There were seven pairs of species with niche overlap values above 0.5,accounting for 33.3%,in the shrub layer of the Sb mining-damaged ecological sites.The niche overlap values of Caragana microphylla with Buddleja officinalis and Rubus coreanus in the shrub layer,and Arthraxon hispidus with Elsholtzia argyi and Sinacalia tangutica in the herb layers were 1.00 in Sb mining damaged ecological sites,indicating similar resource utilization among these species in the plant community.3)There was a negative association in the shrub layer at the Sb mining-damaged ecological sites,whereas a positive association was observed in the herb layer,suggesting that the early stage of succession was found in the plant community.Overall,plant communities in Sb mining-damaged ecological sites require further restoration and succession.Native species with positive associations,such as C.nepalensis and Carex spp.,can be introduced in the future to enhance the seed reserves of soil seed banks.This aids in the regeneration of vegetation and formation of a stable plant community.This study elucidates the interspecific relationships among the dominant species within this community,offering crucial data and theoretical support for the restoration of damaged ecosystems.