Research On Aquatic Plant Diversity And Its Absorption Capacity Of Nutrients In Zhangjiakou District

Aquatic plants are the most important part of the water ecological restoration technology,and its developed root system can absorb nutrients in water.Moreover,the use of aquatic plants as the main body of water ecological restoration can not only control eutrophic water bodies,but also have a good landscape effect without causing secondary pollution.Zhangjiakou is located in arid and semi-arid regions and is a severely waterdeficient area.The Yongdinghe-Yanghe River basin in the area involves the Guanting Reservoir and the Beijing-Zhangjiakou 2022 Winter Olympics bid space.It is the capital's important flood/ecological safety barrier,an important water supply source riverway and water source protection area.The relevant data show that the water quality in the watershed is relatively good during the flood season,and can reach Class III or Class II water quality standards,while the water quality during the wet period and dry season is significantly degraded,and 50% of the monitoring data is V or Bad V.The category still cannot meet the requirement of restoring the function of drinking water in Guanting Reservoir.In order to ensure the safety of drinking water in the capital and the Winter Olympics,it is urgently necessary to upgrade the water quality of the water in the Yongdinghe-Yanghe River basin in Zhangjiakou,upstream of the Guanting Reservoir.Among the many water purification methods,the use of aquatic phytoremediation technology to purify water not only has low cost and good purification effect but also avoids secondary pollution.As the core element of ecological restoration,aquatic plants are used in water treatment in the Zhangjiakou area in the north.Important.Therefore,the screening of ecological engineering species that is well adapted to the restoration of wetlands and the purification of water quality in Zhangjiakou of northern China is a very important issue.This project mainly investigates the aquatic species in Zhangjiakou region,and further studies the diversity of aquatic plants in Zhangjiakou area and the ability of 7 aquatic plants to purify water quality in this area.It also uses aquatic plants to administer eutrophic water bodies in the project in Zhangjiakou area.To restore the ecological function of the wetland system and provide relevant scientific evidence.The survey found that there are 82 species of aquatic plants in the Zhangjiakou area,belonging to 19 families and 35 genera.Among them,there are 56 species of emergent plants,4 species of floating plants,4 species of floating leaf plants,and 16 species of submerged plants.The survey filled the gap in the study of aquatic biodiversity of the Yongding River-Yanghe River basin.Due to the relatively small amount of water in the Yongdinghe-Yanghe River basin and its surrounding areas in Zhangjiakou,many lakes and reservoirs have dried up all year round,resulting in degraded wetland ecosystems,relatively narrow distribution of aquatic plants,and relatively single aquatic plant species at various sites.Most of the points are in the family of Poaceae and Phragmites,and the distribution of other aquatic plants is more limited.According to the distribution area,the principle of local species and previous literature research,seven types of aquatic species used in the experiment were selected: emergent plants(Typha minima,Butomus umbellatus),and submerged plants(Ceratophyllum demersum,Potamogeton crispus,Stuckenia pectinata,Myriophyllum spicatum)and floating plants(Potamogeton natans).Then,through design experiments,the TN and TP contents of the water body are measured regularly to screen out the best aquatic plants that absorb nitrogen,phosphorus,and other nutrients as ecological engineering species for the treatment of eutrophic water bodies.At the same time,water temperature,pH,and dissolved oxygen(DO)are measured.,Oxidation Reduction Potential(ORP),Suspended Matter,Turbidity,Total Organic Carbon(TOC),Chemical Oxygen Demand(COD),Chlorophyll-a,etc.1.The ability of different aquatic plants to remove nitrogen and phosphorus in different months is different.In August,the ability of T.minima to remove nitrogen and phosphorus was higher,and the removal rates of nitrogen and phosphorus were 65.02% and 55.84%,respectively.In September,the Potamogeton.natans removal ability of nitrogen and phosphorus was higher.The removal rates of nitrogen and phosphorus were 88.33% and 77.99%,respectively.In October,the removal ability of nitrogen and phosphorus was higher of four aquatic plants like P.natans,M.spicatum,S.pectinate and B.umbellatus,ie.and there was no significant difference at the level of 0.05;in November,the nitrogen removal rates of the three aquatic plants,P.crispus,M.spicatum,and S.pectinata were all higher,with no significant difference at the 0.05 level;and TP The removal rate was the highest,and the removal rate was 96.28%.In December,the removal rates of nitrogen and phosphorus were the P.natans highest,and the removal rates were 83.29% and 96.08%,respectively.2.Comparing the contribution rates of nitrogen and phosphorus uptake by aquatic plants,it can be known that by the end of December,the removal rates of nitrogen and phosphorus in the roots of T.minima and B.umbellatus are always larger.In the aerial part,the contribution of apoptotic nitrogen and phosphorus uptake declined.Except for Valerian,the nitrogen and phosphorus contents of water in the other six aquatic plant groups continued to decrease in summer,but due to the decay and decay of plants in winter,the nitrogen and phosphorus contents of water bodies increased.The change trend of nitrogen and phosphorus content in water bodies in the grasses was opposite.3.Combining with experimental data,this paper suggests that in the Zhangjiakou area,four kinds of aquatic plants,including the T.minima,P.natans,B.umbellatus and P.crispus,can be planted,which can ensure high nitrogen and phosphorus removal rates in different seasons.,but also to ensure a better landscape effect.4.During the management of aquatic plants,it is recommended that three species of aquatic plants such as B.umbellatus,P.natans,and T.minima should be harvested before November to prevent the release of nitrogen and phosphorus from the plants into the water,resulting in water bodies.The degree of eutrophication has increased.