The Research Of Impact On Birds Of Wind Farm In The Hilly Terrain Of North Guangxi

With the general trend of global wind power development,in the context of north Guangxi wind power industry planning,which is located in the migration route of migratory birds in central China,will become the key development area of Guangxi wind farm industry.In 2017 and 2018,this study used the line method,the point method and the interview method to investigated the spring and autumn bird resources at the wind farm constucted and planned areas in the hilly terrain of north Guangxi,by compared the changes of birds community composition and diversity in different regions and different habitats,the differences of birds diversity with different habitat types in the wind farm constucted and planned areas were analyzed and evaluated.The impact of migratory birds on migratory birds and a reasonable bird strike prevention reference on the habitual activity height of birds.The main results are as follows:1.The wind farm constucted and planned areas in the north Guangxi,the habitat composition is basically the same,and the proportion is slightly changed.In general,the area proportion of arbor forest and shrub forest is the highest,followed by farmland,and the proportion of residential area and the freshwater area is the lowest.The wind farm constucted area will change the habitat proportion,such as arbor forest and shrub forest,the overall change has little effect.With the increase of wind farm constucted time,the growth of forest is restored.2.Total of 11 species of birds were investigated in the wind farm constucted and planned area in the north Guangxi,and 10 species of birds were protected.The overall bird community is dominated by resident birds,the species distribution is dominated by the Oriental type,and the passerine birds are the most abundant.104 species belonged to 34families and 12 orders were surveyed in the spring,and 77 species belonged to 31 families and 10 orders were surveyed in the autumn.There were 70 common species between the two seasons,and the species composition was extremely similar.3.The number of birds in the wind farm constucted and planned area of the north Guangxi was not significantly different(P_{species in spring}=0.953,P_{number in spring}=0.068,P_{species in autumn}=0.218,P_{number in autumn}=0.123,P>0.05),and the birds distribution is related to different types of habitats.The diversity of arbor forest,shrub forest and farmland were higher than residential areas and freshwaters areas.Three habitats of arbor forest,shrub forest and farmland can provide hidden habitats,food and water sources for birds.Because the arbor forest-shrub forest and landside shrub-farmland are similar in spatial distribution and plant composition,with the activities and habitats area of birds were expanded,the similarity between species in the three habitats is higher than residential areas and freshwaters areas.4.Although birds gathering points have been circumvented when wind farms are sited,there are still bird strikes.After investigation,it was found that most of the bird collisions were migratory birds,and the wind farm had an impact on migratory birds,especially nocturnal migratory birds.In the absence of moonlight and thick clouds,migratory birds will be affected by the light near the booster station,and the light source will induce the flight direction of the migratory birds.If large groups of migratory birds migrate in the eve of strong wind and heavy rain,migratory birds will reduce the flight height,which may increase the risk of bird collision.5.Taking into account the range of rotation height of the fan blades,in addition to the special attention to the flight height and flight speed of migratory birds such as Ardeidae,Hirundinidae,Cuculidae.It is also necessary to pay attention to some birds that fly well and have a certain flying height.Although most of the power transmission lines are laid underground,it is necessary to pay attention to the birds that are resting on the wires.Such as the Columbidae,Motacillidae,Laniidae,Corvidae,Dicruridae,Sturnidae,and the raptors,these birds are good at shuttle flight and like on the wires.