Study On The Plant Selection And Configuration Of The Landscape Forest Upgrading In Daxing Distict, Beijing

Daxing is one of the five sand blown hazard areas, the degree of sand blown sand hazard and the scale of the sand disaster area are all large. In the last century, Daxing began to do large-scale afforestation activity and afforestation, and 97% in afforestation trees was poplar in Daxing district, which was said to be ‘a Yang warrior’. In recent years, the comprehensice benefits of poplar in Daxing district were coming down and update slowing, and lack of tree species selection and plants configuration and other low efficiency upgrading technology. To overcome these problems, we studied on about the mode of poplar shetlterbelt retrofit, poplar forest upagrading to park, poplar green channel to upgrade, and so on. The results as follow:1) 22 species of deciduous tree, 6 species of evergreen tree, 31 species of shrub, 20 species of plant species and 6 species of aquatic plants were choose. Deciduous and evergreen trees, shrubs, and aquatic plants choice and reasonable configuration, to add species, seasonal changes in abundance, plant community tends to balance, formed a complex three-dimensional structure.2) the features of recreation, biodiversity, landscape beautification, education, disaster prevention and disaster were reflected. provided a more natural, healthy, harmonious and sustainable leisure places for the residents, the living environment of residents in the surrounding park occurred fundamental changes to fill the the region lacks leisure area of blank, and improved the quality of life of the residents.3) screened for deciduous trees used in the transform and elevate the green channel 8, 6 species of evergreen trees, flowering shrubs and 9 species, 5 species of plants and evergreen trees should strengthen the management and protection, the February orchid, Radix Isatidis need 3~4 years sowing time.4) the 7 models of the upgrading of the green channel were selected, and their respective applicable conditions are determined, and provided the basis for the improvement of the road and block in North China.