| Qingxi Suburban Park is one of the 21 country parks approved by Shanghai Municipal Government in May 2012.Located in the southwest of Qingpu District and the south of Dianshan Lake,the park is adjacent to Jinze Town and Qingpu New Town,and positioned as an exurb wetland country park.park high biodiversity,aquatic vegetation coverage is high,is rich in plant species.Farmland,wetland,lake,river and forest coexist in the park,which is a wetland park with diversified ecological system.However,with the rapid development of economy and the impact of human activities such as purse Seine breeding and the construction of tourist attractions,the ecological health of Qingxi Rural Park has been increasingly damaged and the risk of habitat degradation has increased.In this study,the plant integrity index(V-IBI)was established to evaluate the ecosystem health status of Qingxi Suburban park.To provide a scientific basis for the ecological protection,planning and management of Qingxi Suburban park in the future.In this paper,20 sampling sites in Qingxi Suburban park were investigated from October to November in 2020.According to the plant integrity index(V-IBI)system,the health of Qingxi Suburban park was evaluated,and the correlation between V-IBI coefficient and environmental factors was analyzed.A total of 106 species of plants were identified through the investigation of vegetation in Qingxi Suburb Park.It belongs to 3 phyla,6 classes,53 orders and 56 families,among which dicotyledona occupies a large proportion in each sample site,and the distribution of dominant species in each sample site is somewhat different.Through analyzing 21 alternative indicators of screening,rosaceae plant species,total species and perennial best differentiation,rosaceae plant coverage as the core indicators of evaluation system,using the rule of thirds to assignment of index,could be divided into health,good,green west wetlands generally poor and four levels.(1)Seen from the composition of the taxa,The vegetation collected from river wetland belongs to 3 phyla,5 classes,16 orders and 19 families.Phylum of seed plants,1 class,9 orders and 12 families,accounted for 49.6% of the total species.Among them,Rosa plants accounted for the largest proportion of 14%.Vegetations collected from swamp wetlands belonged to 3 phyla,6 classes,25 orders,30 families,and angiosperms,2 classes,10 orders,12 families,accounting for 44.4% of the total species.(2)The dominant species in different wetland types showed certain differences.The dominant species were Phragmites communis(Cav.)trin.ex Steud.,Digitaria sanguinalis(L.)Scop.,Salix babylonica,Metasequoia glyptostroboides Hu & W.C.Cheng,and Rostellularia procumbens(L.).Nees,Coreopsis basalis(A.Dietr.)S.F.Lake),Broussonetia papyrifera and Hibiscus mutabilis Linn.The most dominant species were found in lake wetlands,followed by swamp wetlands and river wetlands.In general,the vegetation community of Qingxi Suburb Park showed some spatial differences,and the species composition of different wetland types was quite different.(3)the green field in the western suburbs of park plant integrity index by the core indicators by M1(total number),M2(rosaceae plant species),M6(alien species richness),M14(perennial best differentiation),M15(local species best differentiation),M22(rosaceae plants coverage),M26(shannon diversity index)M29plant percentage(sensitivity)constitute the eight core index of ratio method is used to get the green field in the western suburbs of park plant integrity index value,,determine the green wild park in the western suburbs of health assessment standard: >4.99 health,3.74 to 4.99,2.30-3.74,0-1.24 is poorer,the evaluation results show that green wild park in the western suburbs of ecosystem health in good condition of sample points account for 31.8% of the total sample points;The average status of ecosystem health accounted for 13.6% of the samples.Therefore,45.4% of the sample plots in Qingxi Rural Park have been in a state of moderate to severe disturbance.(4)Correlation analysis was conducted between plant integrity index values and physical and chemical index values of related water bodies.The results showed that the plant integrity index(V-IBI)of Qingxi Rural Park was correlated with the concentration of chromium and manganese in water bodies to some extent,but had little correlation with other environmental factors.This study is based on the investigation of plant communities and uses the V-IBI index to evaluate the ecological system health of Qingxi Country Park.The evaluation results have a good degree of discrimination.The plant integrity index of the reference point is significantly higher than the damaged point.In addition,combined with the water body The related physical and chemical factors explored the leading factors affecting the health of the wetland ecosystem in Qingxi Country Park.The results showed that the lake and wetland ecosystem in Qingxi Country Park is in good health.60% of the sample plots are in a healthy state,and 66% of the river wetland is in a healthy state.In general,the health of the marsh wetland ecosystem is greatly disturbed by the outside world,and 55% of the plots are in a moderately disturbed state,and the plant diversity index and richness index of the marsh wetland are lower than those of lake wetlands and river wetlands.The marsh wetland is located in the core conservation area of Qingxi Suburban park,and it is more severely affected by external disturbances.In the future ecological protection of Qingxi Suburban park,more attention should be paid to the standardized tour of the marsh wetland,and fences along the scenic spot should be set up to prevent tourists from trampling.The occurrence of vegetation behavior,and pay attention to the diversity and uniformity of plant communities,reduce the existence of a single vegetation community,and improve the stability of the ecosystem of Qingxi Suburban park. |
PDF Full Text Request