| Shenyang is located in the south of Northeast China and is located at the center of the Northeast Asian economic circle and the economic circle around Bohai.Hunhe River which rises in Changbai Mountain branch-the rolling Ma Ling County in Qingyuan County,Fushun city of Liaoning Province,from east to west through Shenyang City,is the mother river of Shenyang.Shenyang city is divided into Hunbei and Hunnan by Hunhe River.The Hun River with its beautiful coastline and abundant natural resources,has become the most distinctive and vibrant,rich and colorful central area in the development of Shenyang and turns Shenyang into a waterfront garden city.Therefore,the landscape,the quality of vegetation composition of Hun River Waterfront and Riparian zone,is not only a simple environment question,but also provide important support for the development of the society along the river and the construction of Shenyang Century City.The riparian zone is a river water-a zone on both sides of the border area until the river's influence is disappearing.The riparian zone is a common area of water and land ecosystem,and has a unique spatial structure and ecological function.Riparian zone can coordinate the lateral and longitudinal material and energy flow through filtration and interception of sediment,water regulation and nutrient redistribution.Riparian zone is affected by river water habitat,so it has the characteristics of shallow groundwater,high soil fertility,high air humidity,vulnerable to flooding,and the interaction of water and land system.A certain width of riparian buffer zone has many ecological and environmental functions such as controlling non-point source pollution and purifying water quality through physical and chemical actions such as filtration,infiltration,absorption and detention of integrated ecosystem including water,soil and vegetation.This experiment from three aspects to carry out analysis.First of all,to carry out research on vegetation composition and vegetation along the Hunhe River Community distribution.In the rapid process of urbanization,Hun River has evolved into a river in Shenyang.Under the influence of artificial selection,landscape construction and land development,the original natural vegetation community in the riparian zone has basically disappeared.On the composition of shrubs and trees,most of them become artificial selection dominated vegetation communities.Herbaceousplants also have invasive plant species in addition to local common indigenous species.In order to provide basic support for plant community optimization and rational allocation of plant composition,and promote the ecological restoration of riparian buffer zone,the first hand data were collected to identify vegetation composition and community distribution.On the other hand,the analysis of the dominant vegetation buffer capacity of the riparian buffer zone is carried out.The river is generally divided into urban rivers and natural rivers according to its existing environment.The section of Shen Fu is a typical northern city river.The riparian buffer zone is based on artificial construction.In a specific river,Industrial index of Hunhe River riparian buffer width and slope water cannot be changed.Water industry index of Hunhe River riparian buffer width and slope cannot be changed.Based on the long winter climate characteristics,we choose the vegetation composition which can improve the ecological environment function of riparian buffer zone from the perspective of vegetation composition.Through a method which combines field investigation,indoor and outdoor simulation experiments,the section of Shen Fu's buffering capacity of common greening herbaceous and shrub plants on surface runoff are analyzed.In order to meet the premise of the landscaping,screening out plant varieties with strong surface runoff.For Hun River City section of ecological function enhance the choice based on.Finally,carry out river Shen Fu vegetati on optimization model of configuration with buffer.Vegetative Filter Strips(VFS)is located between pollution sources and water bodies,generally striped distributed trees,shrubs or grasslands,which can significantly reduce the impact of nitrogen and phosphorus and other non-point source pollutants on the water body.The bank caching belt is a common application of the vegetation filter belt on the pollution prevention and control of river surface source.The design and structural optimization of riparian buffer strip is the main link to achieve the scheduled ecological function of cache,and it is also the main factor that affects the ability of cache strip to intercept and cache pollutants.The design of riverbank caching belt is mainly composed of the source of pollutants in a particular area,and the optimal structure,plant composition and corresponding management measures are put forward in the terrain.Width,slope,soil condition and climate are the main factors to be considered in the design of riverbank caching belt.According to the preliminary investigation showed that the riparian zone around the road surface,the city community can produce non-point source pollutants,and showed high SS,high COD,high TN and low TP characteristics of VFSMOD model used in this study(VFSMOD)model is put forward by the American University Florida Carpena et al in1999,a mathematical model of rainfall field scale based on the mechanism of vegetation filter is mainly used to simulate the purification effect of sediment and pollutants in surface runoff)for riparian vegetation buffer belt control effect limits,and based on the Shen Fu City section of Hunhe River(climate,soil,topography),composed of different vegetation vegetation buffer strips on runoff and sediment the interception was simulated and the runoff reduction effect,obtain the optimal cache with width,with long index.Based on the results of simulation,simulated vegetation distribution patterns with lab scale method,was composed of vegetation composition and configuration vegetation reduction effect and puts forward some suggestions to optimize the design parameters of the Hunhe River in Shen Fu City section of the riparian buffer zone based on the above results,the formation of the corresponding design,in order to enhance the utilization of riparian buffer strips of Hunhe River City section of landscape ecological function,provide a reference design basis and technology into the river to reduce the lateral non-point source pollutants. |
PDF Full Text Request