Characteristic Analysis Of Exotic Plants In Main Urban Green Space Of Heilongjiang Province

In order to investigate the influence of exotic plants on local plants in Heilongjiang green space,15 sample plots in 5 cities of Heilongjiang Province were selected to do grid survey.The preliminary statistics showed that there were 200 kinds of plants and 20 kinds of plants in Heihe green space,256 kinds of plants in Harbin green space,75 kinds of exotic plants and 119 kinds of plants in Qiqihar green space.There are 26 kinds of alien plants in China and abroad,150 kinds of plants in Jiamusi,30 of which are exotic plants,and 160 kinds of plants in Mudanjiang,48 of which are exotic plants.The introduction of exotic species into green space can be divided into two categories:cultivated species and non-cultivated species.The later the green space is built,the richer the exotic cultivated species are,but they are not related to the exotic non-cultivated species.The larger the green space is built,the more cultivars and non-cultivars there are in different latitudes and longitudes.With the decrease of longitude,the number of exotic and non-cultivated species is more abundant,but there is no significant correlation between the increase of latitude and the decrease.In the areas along the river and non-along the river where the garden green space is located,the number of exotic and non-cultivated species is more abundant than that in the areas along the river.In order to beautify our public environment,the introduction of exotic plants has increased plant diversity,but also has an impact on local plants.In order to predict the future status of plant diversity and control the balance of plant ecosystem,we analyzed the source structure of exotic plants.According to the survey,exotic plants mainly come from North America,followed by Europe and Asia.Amaranthus retroflexus,Erigeron annuus,Conyza canadensis and Pharbitis purpurea have become the dominant species in herbs.