TITLE:
Studies on Ecological Monitoring of Plant Community and Plant Diversity in Shenzhen, Southern China
AUTHORS:
Yuyuan Huang, Xinfan Yu, Hong Liang, Zhiming Yang, Haiyang Wen, Zhen Ye, Yunhe Lu, Ruoyu Wei, Lijun Yang, Song Ma, Kangsai Zhao, Fan Wang, Zhijie Chen, Huina Yang, Chengxi Jiang, Bin Xu, Weimin Wang, Wang Xu, Zhu Ming, Shizhen Lin, Hao Liu, Hualiang Luo, Suni Deng, Lijuan Huang, Yanjun Lei, Xiaoli Wan, Yahe Li, Wanmin Zhou, Shun Zhao, Zhenliang Duan, Dongyao Liao, Xiaobo Qiu, Haoqun Huang, Linlin Jiang
KEYWORDS:
Shenzhen, Vegetation, Community, Structure, Diversity, PM2.5, Ecological Monitoring, Natural Forest, Artificial Forest
JOURNAL NAME:
Open Journal of Forestry,
Vol.11 No.4,
October
20,
2021
ABSTRACT: From
Jan. 2013 to Nov. 2018, we carried out the investigation on vegetation studies in the
ecological monitoring programs, Shenzhen and totally researched 170 plant communities of mountain areas etc., few areas of street regions and parks etc., for
communities’ structural characteristics and plant diversity. We comparatively
analyzed natural forests, semi-natural forest and artificial forest composition
and structural characters and family, genus and species diversity level and the
main affected factors. We also researched and analyzed these communities’
structural characteristics and pant diversity, comparatively
analyzed natural forests, semi-natural forest and artificial forest
composition and structural characters and family, genus and species diversity
level, the main affected factors; researched and analyzed the relationship
between plant community structure characteristics with the absorbing ability to
PM2.5 pollutants. The result showed that the structure and plant
diversity of natural forest were obviously better than artificial disturbed forest or artificial forest, the semi-natural
forest was the middle level of the forests, In the indices of height, DBH, coverage
and crow width etc. of tree layer, natural forests and semi-natural forests
were obvious higher than that of artificial disturbed forest or artificial
forest; in some forests of artificial disturbed forest or artificial forest,
though their richness indices of family and genus were a slightly higher, but
this contribution was majorly due to herb layer plants, and some shrub layer
plants. Analyzing three kinds of communities, the number of tree layer species of natural
forest was the largest, and their every α-diversity
index 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 of
artificial disturbed forest or artificial forest were a slightly
higher than that of some natural forests, but the integral values of the
diversity indices of natural forest and semi-natural forest were obviously higher
than the former. The research showed that in the artificial disturbed forest or
artificial forest, because there have some little scale clearing areas, so
some pioneer plant species could enter the community and formed a temporarily increase of species diversity, however, these
species 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 otherecological efficient have major and dominated position and so on; and then this community can be natural recovery and succession, those forementioned new entire plants
shall withdraw from the community and are replaced by the original plants of
the community; but this process has already caused the ecological efficient
loss and ecosystem unstable. Above research results are better evidence and
theory reference to the argument problems on that are natural forest and natural restoration forest biodiversity higher? or is
artificial forest biodiversity higher? and or is more artificial disturbed
forest higher? Our researches showed that used
random investigation method set quadrats, and combined typical investigation
method, the structural indices in the all layer of community and all diversity
indices of tree, shrub and herb layers and the integral values were similar, same or usually these indices in the
community which set 600 m2, 800 m2 total quatrat area
were 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 to
minimum area method for vegetation survey, in subtropical region, using random
investigation method combined with typical investigation set 400 m2 or 400 m2 - 500 m2 total quad