| The sample survey method was used in this study.Twelve plant communities in Dongfeng canal(huayuan road to jingsan road)of Zhengzhou were selected as the sample plots,all sample plots were representative waterfront green space in Zhengzhou.The investigation mainly included the community structure,community structure,growth status and the diversity of plant communities.In June2015 to February 2016,the negative air ions concentration in the twelve plant communities was measured,the air anion level and its influencing factors were analyzed.Ten plant communities in Dongfeng canal(North of 3rd ring road to Zhouzhong road)of Zhengzhou were selected as the sample plots and ten evaluation factors were selected and appraised using scenic beauty estimation method(SBE).Through the investigation and analysis,some reference was put forward to improve the urban waterfront plant communities in Zhengzhou.The results were as follows:1.In the twelve samples,plant species in total are 24 species belonging to 24 genera in 17 families.There are 10 species,10 genera,8 families in arbor,8 species,7genera,5 families in shrub,6 species,6 genera,4 families in grass and ground cover plant,21 species,20 genera,14 families in angiosperm.Among them,there are 11 species in deciduous plants,13 species in evergreen.2.The artificial community in Dongfeng canal has a certain zonal characteristics,evergreen broad-leaf forest of artificial cultivation accounted for a large advantage(58%).And next is evergreen and deciduous broad-leaved mixed forest(25%),It can be seen that the evergreen and evergreen broad-leaf forest accounted for a large advantage in the artificial plant community vegetation types.3.According to the whole situation of the green community,the species abundance average degree of arbor,shrub,grasses in sample communities is 1.6800.The average of Gleason index is 0.3995,the average of Margalef index is 0.1552,the average of Simpson index is 0.3710,the average of Shannon-Wienner index is 0.2294.And the average of Berger-Parker index which reflect ecological predominance degree of preponderant species is 0.7401,the average of Pielou index E is 0.2652.The results indicated that the integral level of species richness,coverage and uniformity in sample area plant community is not high.4.The negative air ions concentration in plant communities sample area was the highest in summer.Then it was slow down to the lowest in November 2015.The contrastive plots had the same change trend.Air quality was the best in summer,the second was autumn,winter was the worst in June 2015 to February 2016.The air negative ions concentration of linear green space in different seasons was significant difference(P<0.05).5.The impact factor of negative air ions concentration in different seasons was analyzed.The mutual relation among urban zonal greenbelt air negative ions concentration,temperature,relative humidity,illumination intensity and PM10 was compared.The results indicated that the air negative ions concentration was significantly negative related to illumination intensity in summer(P<0.05),it had no significant related to temperature,illumination intensity and PM10.In autumn,the air negative ions concentration was significantly positively related to temperature(P<0.05),and it was significantly negative related to relative humidity(P<0.05),it had no significant related to illumination intensity and PM10.In winter,the air negative ions concentration was significantly positively related to relative humidity(P<0.05),it had no significant related to temperature,illumination intensity and PM10.The correlation between negative air ions concentration and other factors in air were impacted by seasons,and the discrepancy was different in different seasons.6.The negative air ions concentration in different plant community structure of urban green space was significantly difference.In same plant community,the negative air ions concentration in summer was apparently higher than autumn,winter was the lowest.The negative air ions concentration in community sample was obvious higher than other samples which around the water.7.The evaluation results by SBE methods were as follows: different community score had a certain difference.According to the evaluation result,typical plant community landscape S6,S8,S9,S10 was selected and analyzed in detail in order to show certain reference significance to other construction of urban waterfront greenbelt. |
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