Research On Spatial Differentiation Of Ecological Vulnerability And Restoration Strategy In Dagu River Basin (Jiaozhou Section)

At present,under the influence of many factors such as climate,my country’s ecological environment has many problems.Among them,the shortage of water resources and land desertification have caused the sensitivity and stability of its ecosystem to decline,causing serious challenges to ecological security.In-depth investigation of the regional environment,scientific assessment of the external ecological pressure of the region and the region’s own ecological resilience will help to propose targeted restoration strategies for the sensitive areas of the ecological environment in the later period.This paper takes Dagu River Basin(Jiaozhou Section)in Qingdao City,Shandong Province as the research object.According to the current administrative division,the research area is divided into 34 small ecological spots.The grid method is used to determine the sampling points,and the soil(heavy metals,Organic matter,p H,quick-acting P,quick-acting N,quick-acting K),water(dissolved oxygen,chroma,turbidity,total dissolved solids,p H),vegetation(number,type,name),climate(average temperature,precipitation,sunshine)Hours,average air pressure),humanistic and socio-economic conditions for outdoor monitoring and indoor analysis,using a combination of analytic hierarchy process and entropy method to determine the weight of each index,quantitative analysis of the natural and human environment of the study area and ecological fragility The 34 ecological spots are divided into five grades(potentially fragile,slightly fragile,mildly fragile,moderately fragile,and severely fragile),and interpret the ecological space composition of the Dagu River Basin(Jiaozhou Section)based on the research results Finally,it analyzes the causes of its ecological fragility,and proposes targeted ecological environment management and restoration strategies.The research conclusions are as follows:(1)The organic matter of soil samples in the Dagu River Basin(Jiaozhou section)ranged from 0.3% to 27.3%,with an average value of 3.42%.Among them,the organic matter content of the samples in forest land and farmland was mostly above 20%.The organic matter content of the spot is below 1%,and the average value of all the sample areas in each ecological spot is used to obtain the organic matter content of each ecological spot.Hongdao Street has the highest organic matter content,which is 8.52%;Hetao Street is the smallest.It is 1.57%;the average is 3.92%.The content of available N in all samples in the study area is between 0.6-122.4ppm,with an average value of10.72 ppm.Among the 34 ecological spots,the content of available N in the soil of Puji Town is the highest,at 23.3ppm;the content of Hetao Street is the smallest,at 4.21ppm;the average value is 10.78 ppm.The content of available P in all samples was between1.46-216.6 ppm,with an average value of 20.97 ppm.Among the 34 ecological spots,the content of available P in Jiaodong Town was the largest,at 123.8 ppm;the content in Huanxiu Street was the smallest,at 13.6 ppm;the average is 23.9 ppm.The content of available K in all samples was between 0.94-275.68 ppm,and the average value was16.17 ppm.Among the 34 ecological spots,the content of available K in Hongdao Street was the highest,at 35.55ppm;the content in Aoshanwei Street was the smallest,at7.32 ppm.A total of 6 heavy metals were detected in the soil,of which the Mn content of all samples was 103-1081 mg/Kg,and the content of Cr,Pb,Zn,Cu,and Ni ranged from 0-433 mg/Kg,0-423 mg/Kg,0-455 mg/Kg,22-121 mg/Kg,0-160 mg/Kg,among the 34 ecological spots,Hongdao Street has the highest Mn content at 538.6ppm,and the economic development zone has the smallest Mn content at 275.38ppm;The average value is 432.1 ppm.The largest contents of Cr,Pb,Zn,Cu,and Ni are Longshan Street(121.23ppm),Tongji Street(107.5ppm),Longquan Street(96.13ppm),Fu’an Street(103.1ppm),Longshan Street(47.8ppm).);the smallest content is Shangma Street(29.17ppm),Yanghe Town(26.67ppm),Fu’an Street(33.22ppm),Puji Town(35.4ppm),and Licha Town(14.3ppm);the average values ??are 87.77 ppm and57.26 respectively.ppm,72.98 ppm,63.27 ppm,36.30 ppm.(2)The ecological vulnerability index of 35 ecological small spots ranges from0.065 to 0.934,with an average value of 0.310.Among them,the ecological vulnerability index of Hetao Street is the largest,0.934,and the vulnerability level is severely vulnerable,accounting for 2.940%;Sanlihe Street The ecological vulnerability index of 10 ecological small spots is the smallest,all <0.200,and the vulnerability level is the potential vulnerability level,accounting for 29.400%;the ecological vulnerability index of 11 ecological small spots such as Puji Town is between 0.200-0.400,and the vulnerability level is Slightly fragile,accounting for 32.400%;the ecological vulnerability index of 10 ecological spots such as Licha Town is between 0.400-0.600,and the vulnerability grade is slightly fragile,accounting for 29.400%;Yanghe Town and Ligezhuang Street Ecological The vulnerability index is between 0.600-0.800,and the vulnerability level is moderately vulnerable,accounting for 5.880%.(3)This article connects the basin itself with the Jiaolai Plain,Laoshan Scenic Area,Zhushan Mountains,Dagu River Eco-tourism Resort,Shaohai Wetland Park,Hongdao Wetland Park and other nodes,with the Dagu River estuary as the center.Create a "one axis-three belts-eight points" planning pattern,and propose ecological environment management and restoration strategies for the ecological spots under each ecological fragility level:(1)Potential vulnerability level: supervision is the main priority,governance is the supplement Establish ecological and environmental quality supervision stations to detect and investigate potential threats to the ecological environment from time to time,even if countermeasures are taken.(2)Slightly fragile and mildly fragile levels: Regulate human activities and social order,increase plant planting,and take appropriate measures for water and soil management with reference to moderate and severely fragile ecological spots.(3)Moderately fragile: The water treatment adopts an assembled physical and ecological synergistically enhanced sinking river water purification device(Figure 5.1),an ecological floating bed and a mud drainage system are set up,and the soil heavy metal treatment adopts a compound method combining plants and microorganisms for treatment.(4)Severely fragile: First,the severely fragile Hetao Street is divided into the ecological restoration area,the residential area,the waterfront entertainment area,and the economic production area.The functional area of the ecological restoration area is taken as the key target for governance and further Divided into 4 areas,according to the environmental status of each area,the treatment measures combined with electric remediation method,water washing method,thermal desorption method,solidification and stabilization,and foreign soil method are proposed respectively.The water treatment is in the ecological floating bed.The application of aeration and aeration technology is added on the basis of the system to avoid the occurrence of problems such as insufficient oxygen in the water body caused by factors such as the shelter of the ecological floating bed.