Niche and Interspecific Association of Dominant Species in Urban Green Space of Plant Communities of Dongguan City
The niche characteristics and interspecific relationships of dominant populations were investigated in three urban green space communities located in the central urban area of Dongguan city.The differences in species alpha diversity among different green spaces,the importance values of tree,shrub,and herb plants within the communities,ecological niche widths(Levins and Shannon indices),Pianka index,and interspe-cific relationships were analyzed.The results showed that the Shannon-Wiener diversity index and species rich-ness index of shrubs in community green spaces were significantly higher than those in street green spaces(P<0.05).The Shannon-Wiener diversity index and species richness index of herbaceous plants in park green spaces were significantly higher than those in community green spaces(P<0.05).The top three niche breadth of trees,shrubs and herbs in the park green spaces were Litchi chinensis(BL=6.13,BS=1.94),Litsea gluti-nosa(BL=9.49,BS=2.41),and Lygodium japonicum(BL=20.73,BS=3.17),respectively.The top three niche breadth of trees,shrubs and herbs in the street green spaces were Lagerstroemia indica(BL=4.15,BS=1.51),Duranta erecta(BL=3.53,BS=1.40),and Alocasia odora(BL=13.84,BS=2.72),respec-tively.The top three niche breadth of trees,shrubs and herbs in the community green spaces were Osmanthus fragrans(BL=11.05,BS=2.56),Heteropanax fragrans(BL=8.44,BS=2.32),and Oxalis corniculata(BL=12.36,BS=2.78),respectively.The Pianka index showed that the niche overlap between dominant tree pop-ulations was low,and the niche overlap between dominant herb populations was high.The overall correlation between the main species in the park green space was significantly positively correlated.The overall correlation between trees and herbs in street green spaces was significantly positive,and there was a significant negative cor-relation between the main species of shrub.There was a significant negative correlation between the main species of tree in the community green spaces,and a significant positive correlation between the main species of shrub and herb.There was a strong and positive correlation between the ecological niche overlap index and the associa-tion coefficient AC.The species composition and community structure of the three urban green spaces plant com-munities in Dongguan city are relatively stable.Based on this,in urban landscape construction and gardening,priority should be given to selecting species with similar ecological habits and biological characteristics.
Dongguan cityurban green spacespecies diversitynicheinterspecific association
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