Citation: | LI Meina, YIN Ping, DUAN Xiaoyong, DONG Chao, CAO Ke, YANG Lei, CHEN Xuanbo. 2022. Land use change and ecosystem effect in typical coastal zone of Yangtze River Delta in the last 20 years[J]. Geology in China, 49(4): 1114-1126. doi: 10.12029/gc20220406 |
This paper is the result of the environmental and ecological survey engineering.
In the past 20 years, the land type distribution in coastal areas of the Yangtze River Delta has been significantly transformed, highlighting conflicts between coastal zone development and protection.This study examines land use changes and eco-environmental effects in coastal areas of the Yangtze River Delta and seeks to provide a scientific basis for the sustainable use of land resources and environmental protection in the coastal areas.
Automatic supervised classification combined with visual interpretation of remotely sensed images from the Landsat satellite series of the United States and the resource satellite series of China was used to obtain land use classification data for the study area over five periods between 1995 and 2015.The data were analysed to determine the characteristics and trends in land use changes and explore spatial and temporal changes in urban development, reclamation, and eco-environmental effects in typical coastal areas of the Yangtze River Delta.
From 1995 to 2015, the typical areas (Nantong, Shanghai, Jiaxing, Ningbo, and Zhoushan) experienced significant changes in land use, with a notable decrease in arable land from 68.8% in 1995 to 55.7% in 2015, whereas urban construction land expanded rapidly, with an average annual increase of 192.8 km2.
With rapid urbanisation, the population and energy consumption per unit area increased rapidly, environmental concerns became pronounced, a large area of arable land was converted to construction land, and reclamation caused a rapid decline in coastal wetland areas, resulting in high CO2 and a severe imbalance between the release and absorption of pollutants.The marine environment has been significantly affected by the construction of watersheds and coastal towns, and red tides have occurred frequently in the Yangtze River estuary and adjacent waters in the past 20 years, thereby increasing pressure on the land and marine environment in the study area.
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Location of the study area
Land use classification results in the Yangtze River Delta from landsat imagery during 1995-2015
Spatio-temporal evolution of construction land in typical coastal zone of Yangtze River Delta during 1995-2015
The intensity index of construction land expansion in the study area
Trend chart of reclamation in typical coastal zone of Yangtze River Delta during 1995—2015
Carbon budget distribution maps of major cities in the Yangtze River Delta in 1995, 2000 and 2007 (after Sun Wei, 2012)
Distribution map of coastal wetland in the Yangtze River Delta(2015)
Coastline changes in typical coastal areas of the Yangtze River Delta(2000—2015)
Diagram of the correlation between wastewater and exhaust gas discharge and construction land growth in the coastal zone of the Yangtze River Delta
Occurrence of red tides in the East China Sea and discharge of industrial wastewater in Shanghai(2000—2015)