The Study On Plant Diversity And Freezing Injury With Freezing Recovery In Fuzhou City Park

Urban green space is an important part of urban ecosystem and is an important carrier of urban biodiversity.From December 2015 to early March 2016,affected by the La Nina phenomenon,Fuzhou's temperature had cooled substantially,around January 25 in 2016,the temperature had first lowed to less than zero,which was the lowest in recent decades,resulting in that street greenbelt plants were in different degrees of freezing injury of Fuzhou City Park,especially the frozen alien species.This study analyzes plant diversity of the parks in Fuzhou City,and investigates the damage and recovery,also puts forward the corresponding suggestions for biodiversity conservation and antifreezing measures,which can provide a theoretical basis for the protection and construction of city parks,provides the diversity of plant introduction and landscape plant configuration.The main results are as follows:Based on the investigation of the 43 main parks in Fuzhou,it is found that the species of the park green space in Fuzhou are rich,there are a total of 901 species,belonging to the family of 547 and 148 genera.The similarity of plant configuration is high,and the usage of plants is high.On the aspect of species life,252 species of arbor,169 species of shrub,388 species of grass,30 species of grass vine,and 26 species of woody vine;From the color-leafed plants,there are 163 kinds of species,belonging to 64 families,104 genera,tree layer and shrub layer are in artificial cultivation;From the source of species,there are 506 kinds of native species,the introduction of the species is 395,of which the introduction of domestic is 115,and the introduction of the foreign is 280.Based on the investigation of the 16 main parks in Fuzhou,in cold resistance,found that the local adaptation is of good performance,the foreign introduction is of poor performance,the survey found that there are 272 kinds of species,belonging to 97 familis,197 genera,whose species accounted for 30.19%of the total plant.In the life form,a total of 106 kinds of frozen trees(42.06%of the total number of trees accounted for freezing),101 species of shrubs(49.51%)and 101 species of herbs(16.75%);Color-leafed plants(145 kinds of species,88.96%)have obvious regional differences of the degree of damage,damage level from downtown to the suburban park is increasing;In the species source,there are 68 native species,accounted for 13.44%of the total species,and 204 kinds of foreign species,accounting for 51.65%of the total foreign introduction,in the foreign introduction,60 species are introduced from domestic,which accounting for 52.17%,and 144 species are introduced from foreign,accounting for 51.43%of the total foreign-introduced species;Plants which was introduced from tropical American,tropical Asia,South America,North America,had affected by seriously freezing,there frozen plants had accounted for more than 1/2 of the total amount of introduction.Based on the investigation of the 11 parks in Fuzhou,makes a further observation on the growth and recovery situation of 131 kinds of frozen plants after freezing.2 months later,the tree did not recover,20 kinds of shrubs had recoveried(accounted for 35.71%),21 species of herb had restored(60%);5 months later,only 6 species of tree had restored(15%),50(89.29%)species of shrub had recoveried,33(94.29%)kinds of herbs,67.53%evergreen woody plants and 21.05%deciduous woody plants had recovered;9 months later,60%kinds of trees,93.41%kinds of shrubs,100%kinds of herbs had recovered,the status of recovery displaied:herb,shrub,tree;evergreen broad-leaved tree,deciduous tree.