Remote Sensing Monitoring and Temporal Variation Analysis of Coastal Aquaculture in Shandong Province in the Recent Three Decades

Shandong is one of the largest aquaculture producing provinces in China,and its aquaculture land changes significantly in both quantity and spatial distribution in the recent 30 years.This paper chose the coastal aquaculture land use in Shandong Province as the research object.In order to extract the aquaculture land use information,the interactive visual interpretation method incorporating spatial and spectral information from multisource image objects was applied to Landsat TM/ETM+,CBERS-02B and HJ-1 images which were acquired in the late 1980s,2000,2005 and 2010 covering the coastal area of Shandong Province.Furthermore,to reveal the spatial pattern of Shandong coastal aquaculture land use evolution,we adopted different models including the single land use dynamic index,the gravity center,the landscape fragmentation and multi-model analysis of spatial information such as changes in the distribution area statistics.Results show that:from the late 1980s to 2010,Shandong coastal aquaculture area has increased,but the increase rate varies slightly in different periods; the dynamic degree from the late 1980s to 2000 is about 16.95%,which is the largest.It decreases gradually after2000.The changes of aquaculture land use indicate the spatial heterogeneity.The aquaculture area in Dongying city keeps growing fast,followed by Binzhou city and Weihai city.But the growth rate in Qingdao city and Weifang city has dropped after a period of increment.For nearly 30 years,the fragmentation degree of the aquaculture area has increased by 4.5 times,and the gravity center of the aquaculture area has migrated to the northwest.The increased aquaculture land is mainly transformed from the construction land,sea water bodies and the agriculture land.The loss in aquaculture land is mainly turned into construction land and other forms of water bodies.