China’s mariculture provides more than 60%of the world’s mariculture products and plays an important role in the world’s aquaculture and food supply.Research on changes in the spatial distribution pattern of China...China’s mariculture provides more than 60%of the world’s mariculture products and plays an important role in the world’s aquaculture and food supply.Research on changes in the spatial distribution pattern of China’s mariculture,however,remains lacking.To accurately reflect the changes in the spatial pattern of mariculture in China,in this study,we used multitemporal optical and synthetic aperture radar remote sensing images to enhance the characteristics of mariculture and extracted the spatial distribution data for mariculture in China in 2000,2010,and 2020.Accordingly,we explored the distribution pattern and changes in mariculture in China.We found that,in 2020,China’s mariculture exhibited a distribution pattern of more in the north and less in the south.With the Yangtze River estuary as the boundary,the proportion of mariculture in northern China was 70.9%,and that in southern China was only 29.1%.This difference did not exist in 2000,but it emerged because of the rapid development of mariculture in northern China from 2010 to 2020.In addition,by superimposing the mariculture data with shoreline and water depth data,we found that more than 90%of China’s mariculture area was located in the sea area within 20 km of the shoreline and that more than 80%of the mariculture area was located in the sea area with water depths of less than 20 m.In addition,the spatial distribution of mariculture in China developed from near the shore and moved outward from shallow to deep water areas.We examined the driving factors that influence changes in the spatial distribution of mariculture in China.We argue that technological advancements in mariculture,as well as the intensive concentration of mariculture near the shore,policy constraints and incentives,and economic development,collaborate to shape the current pattern of mariculture development in China.展开更多
Due to the weak information about cultural targets in the complex marine environment,an omission problem exists in large-scale mariculture extraction using single-view and single-source images.To overcome this problem...Due to the weak information about cultural targets in the complex marine environment,an omission problem exists in large-scale mariculture extraction using single-view and single-source images.To overcome this problem,we developed a mariculture extraction method that combines dense time-series Sentinel-2 and Sentinel-1 data.A high-precision Chinese mariculture distribution map for 2020 was produced with an overall accuracy of 94.00%and a kappa coefficient of 0.91.The results show that(1)the total area of mariculture was 1173249.22 ha on the national scale,which was significantly larger than the previous studies(459595.70 and 205920.28 ha,respectively),with Shandong Province(39.09%)having the largest proportion;(2)China’s mariculture presented a spatial distribution characteristic of‘Denser North and Sparser South’,and mariculture was centralized in the coastal zones of the northern provinces(60.76%)rather than the southern provinces;(3)the official production statistics and remote sensing-derived mariculture area revealed a highly corresponding trend at the provincial level,with an R2 reaching 0.78,which is much higher than the 0.07 and 0.41 values of the comparison data.The results directly provide data reference for mariculture production estimation and site selection or ideas for mariculture extraction in other regions and globally.展开更多
基金The National Key Research and Development Program of China,No.2021YFB3900501National Natural Science Foundation of China,No.42306246,No.42371473+1 种基金The Key Project of Innovation,LREIS,No.KPI001The Youth Project of Innovation,LREIS,No.YPI004。
文摘China’s mariculture provides more than 60%of the world’s mariculture products and plays an important role in the world’s aquaculture and food supply.Research on changes in the spatial distribution pattern of China’s mariculture,however,remains lacking.To accurately reflect the changes in the spatial pattern of mariculture in China,in this study,we used multitemporal optical and synthetic aperture radar remote sensing images to enhance the characteristics of mariculture and extracted the spatial distribution data for mariculture in China in 2000,2010,and 2020.Accordingly,we explored the distribution pattern and changes in mariculture in China.We found that,in 2020,China’s mariculture exhibited a distribution pattern of more in the north and less in the south.With the Yangtze River estuary as the boundary,the proportion of mariculture in northern China was 70.9%,and that in southern China was only 29.1%.This difference did not exist in 2000,but it emerged because of the rapid development of mariculture in northern China from 2010 to 2020.In addition,by superimposing the mariculture data with shoreline and water depth data,we found that more than 90%of China’s mariculture area was located in the sea area within 20 km of the shoreline and that more than 80%of the mariculture area was located in the sea area with water depths of less than 20 m.In addition,the spatial distribution of mariculture in China developed from near the shore and moved outward from shallow to deep water areas.We examined the driving factors that influence changes in the spatial distribution of mariculture in China.We argue that technological advancements in mariculture,as well as the intensive concentration of mariculture near the shore,policy constraints and incentives,and economic development,collaborate to shape the current pattern of mariculture development in China.
基金supported by the National Key Research and Development Program of China[grant number 2021YFB3900501]the National Natural Science Foundation of China[grant number 41671436,41901354,41890854]the Innovation Project of LREIS[grant number O88RAA01YA].
文摘Due to the weak information about cultural targets in the complex marine environment,an omission problem exists in large-scale mariculture extraction using single-view and single-source images.To overcome this problem,we developed a mariculture extraction method that combines dense time-series Sentinel-2 and Sentinel-1 data.A high-precision Chinese mariculture distribution map for 2020 was produced with an overall accuracy of 94.00%and a kappa coefficient of 0.91.The results show that(1)the total area of mariculture was 1173249.22 ha on the national scale,which was significantly larger than the previous studies(459595.70 and 205920.28 ha,respectively),with Shandong Province(39.09%)having the largest proportion;(2)China’s mariculture presented a spatial distribution characteristic of‘Denser North and Sparser South’,and mariculture was centralized in the coastal zones of the northern provinces(60.76%)rather than the southern provinces;(3)the official production statistics and remote sensing-derived mariculture area revealed a highly corresponding trend at the provincial level,with an R2 reaching 0.78,which is much higher than the 0.07 and 0.41 values of the comparison data.The results directly provide data reference for mariculture production estimation and site selection or ideas for mariculture extraction in other regions and globally.
