| According to China Fisheries Statistics Yearbook 2001-2015 seaweed production,artificial seaweed production accounted for 67.79%of total seaweed production,and artificial seaweed carbon sequestration accounted for 70.93%of total seaweed carbon sequestration.In order to actively understand the impact of offshore kelp aquaculture on social and economic benefits and ecological environment,it is urgent to study the spatial and temporal distribution of key cultured kelp in typical areas and the suitability evaluation and Countermeasures of kelp aquaculture areas.Therefore,this paper firstly uses remote sensing image data and aquaculture kelp yield data to analyze the dynamic change process of aquaculture kelp in Rongcheng City from the perspective of spatial and temporal distribution,then uses the land use change evaluation method to construct the dynamic degree of sea area utilization and the range of sea area utilization change,and based on this,puts forward the planning suggestions of offshore kelp aquaculture area,and finally combines the impact of sea kelp aquaculture space.Based on the SMCE model of environmental factors and social infrastructure factors,the suitability evaluation of kelp aquaculture areas in the coastal waters of Rongcheng City was studied by means of GIS,and the carbon sequestration intensity of kelp aquaculture and marine ecosystem and its impact on regional economic benefits were analyzed.The main conclusions are as follows:(1)From 2001 to 2015,the area and yield of mariculture kelp in Rongcheng City showed an overall upward trend.Among them,aquaculture kelp occupied the largest area in 2017 and the smallest area in 2004,with an average area of 266.15 km~2.Among them,in Rongcheng City,the range of sea area utilization change of cultured kelp decreased by 7.21 km~2 in the five years from 2000 to 2005,and the increase of sea area of cultured kelp increased by different ranges every five years from 2005 to 2017.The dynamic degree of sea area is as follows:decrease,increase,increase,increase,increase.During 17a,the area of kelp culture in Rongcheng City increased as a whole,and the dynamic degree of sea area utilization was positive.(2)The results of suitability evaluation of kelp culture area in Rongcheng City show that the average suitability grade of the whole study area is 5.5,the area of Grade8 is 153.28 km2,accounting for 7.68%of the total area of the study area,the area of Grade 7 is 400.93 km2,accounting for 20.10%of the total area of the study area,and the area of the appropriate grade(4-6)is 234.85 km2,accounting for 61%of the study area.After merging the suitable grade(4-6)and the high grade(7-8),the area with the suitable grade(4-8)accounted for 89.69%of the total area of the study area.95%of the existing kelp culture areas were distributed in suitability grade(4-8 area).(3)Based on the results of suitability evaluation,the influencing factors were analyzed by sensitivity analysis.The results showed that in the suitability evaluation model of kelp aquaculture area in Rongcheng City,the change of water depth data was more sensitive than temperature change,and the increase of water depth data in the model was more sensitive than the decrease of water depth data.(4)Based on the experiment of kelp culture in Rongcheng City,a typical culture area of Rongcheng City,mixed culture of shellfish and algae,seasonal cultivation of algae and single kelp cultivation can improve the yield of kelp cultivation and carbon sequestration intensity of algae system cultivation.At the same time,the calculation results of kelp yield data and CCI index show that the carbon sequestration intensity of kelp in Rongcheng City has increased sharply since 2014,and the proportion of carbon sequestration intensity of kelp culture in Shandong Province and the whole country has increased year by year. |
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