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- W3205682605 abstract "FromJan. 2013 to Nov. 2018, we carried out the investigation on vegetation studies in theecological monitoring programs, Shenzhen and totally researched 170 plant communities of mountain areas etc., few areas of street regions and parks etc., forcommunities’ structural characteristics and plant diversity. We comparativelyanalyzed natural forests, semi-natural forest and artificial forest compositionand structural characters and family, genus and species diversity level and themain affected factors. We also researched and analyzed these communities’structural characteristics and pant diversity, comparativelyanalyzed natural forests, semi-natural forest and artificial forestcomposition and structural characters and family, genus and species diversitylevel, the main affected factors; researched and analyzed the relationshipbetween plant community structure characteristics with the absorbing ability toPM2.5 pollutants. The result showed that the structure and plantdiversity of natural forest were obviously better than artificial disturbed forest or artificial forest, the semi-naturalforest was the middle level of the forests, In the indices of height, DBH, coverageand crow width etc. of tree layer, natural forests and semi-natural forestswere obvious higher than that of artificial disturbed forest or artificialforest; in some forests of artificial disturbed forest or artificial forest,though their richness indices of family and genus were a slightly higher, butthis contribution was majorly due to herb layer plants, and some shrub layerplants. Analyzing three kinds of communities, the number of tree layer species of naturalforest was the largest, and their every α-diversityindex value was the highest; these characteristics values of semi-natural forest were second,artificial disturbed forests or artificial forests were the lowest; in shrub layer, and herb layer, few α-diversity indices ofartificial disturbed forest or artificial forest were a slightlyhigher than that of some natural forests, but the integral values of thediversity indices of natural forest and semi-natural forest were obviously higherthan the former. The research showed that in the artificial disturbed forest orartificial forest, because there have some little scale clearing areas, sosome pioneer plant species could enter the community and formed a temporarily increase of species diversity, however, thesespecies major were some shrub and herb plants; but tree layer possessed obviously more,even surpassed several ten times biomass than shrub and herb layers. Therefore, the respects of maintain ecosystem stability and other ecological efficient have major and dominated position and so on; and then this community can be natural recovery and succession, those forementioned new entire plantsshall withdraw from the community and are replaced by the original plants ofthe community; but this process has already caused the ecological efficientloss and ecosystem unstable. Above research results are better evidence andtheory reference to the argument problems on that are natural forest and natural restoration forest biodiversity higher? or isartificial forest biodiversity higher? and or is more artificial disturbedforest higher? Our researches showed that usedrandom investigation method set quadrats, and combined typical investigationmethod, the structural indices in the all layer of community and all diversityindices of tree, shrub and herb layers and the integral values were similar, same or usually these indices in thecommunity which set 600 m2, 800 m2 total quatrat areawere higher (α-diversity) than that of more than 3000 m2,4000 m2 or 7000 m2, even more than 17,000 m2 total quadrat area of communities. These lots of researches further proved that according tominimum area method for vegetation survey, in subtropical region, using randominvestigation method combined with typical investigation set 400 m2 or 400 m2 - 500 m2 total quad<span" @default.
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- W3205682605 date "2021-01-01" @default.
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- W3205682605 title "Studies on Ecological Monitoring of Plant Community and Plant Diversity in Shenzhen, Southern China" @default.
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- W3205682605 doi "https://doi.org/10.4236/ojf.2021.114022" @default.
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