Abstract: Based on the catch of fishing season (January-June) and ocean remote sensing data of Antarctic krill fishing area from 2010 to 2015, we analyzed the spatiotemporal variations in the catch per unit fishing effort (CPUE) of Antarctic krill by using statistical method and yield center of gravity method. Results showed that the mean annual CPUE of Antarctic krill increased gradually from 2010 to 2015, with a peak in 2014 (18.6 t·h^-1). The mean monthly CPUE of Antarctic krill was lower in January (9.2 t·h^-1), while highest in May (20.9 t·h^-1). Nearly 60% of the catch times were in the summer period (January-March) near the South Shetland Islands. The Antarctic krill fishing grounds were concentrated in the sea area between 60°S-64°S and 46°W-62°W. The center of gravity in fishing ground shifted from the sea area near the South Shetland Islands to the northeast during January to June every year. Most of the fishing ground barycenter was mainly concentrated in the sea area near the South Shetland Islands. The optimum sea surface temperature (SST) of the fishing ground ranged from -1.8 to 1.9, -1.8 to 0.8 and 1.1 to 1.4 ℃ in fisheries subzones 48.1, 48.2 and 48.3, respectively. The optimum SST range of the high CPUE fishing areas from January to March was -0.8 to 1.2 ℃, which decreased from -1.8 to -0.4 ℃ in April-June period. The optimum ranges of chlorophyll a concentration in the subzones48.1, 48.2 and 48.3 were 0.09-1.21, 0.14-0.52 and 0.32-0.39 mg·m^-3, respectively. The chlorophyll aconcentration in the areas with high CPUE (>20 t·h^-1) values was 0.13-0.83mg·m^-3. Overall, the annual CPUE of Antarctic krill showed an increasing trend during 2010-2015. The main fishing area was located near the South Shetland Islands. The optimum SST range of the central fishing ground was -1.8 to 1.2 ℃, and the range of chlorophyll a concentration was 0.13-0.83 mg·m^-3.

Key words: deep soil., soil moisture, Loess Plateau, land use type