Abstract: This paper studied the nutrient enrichment effect of Antarctic krill (Euphausia superba) powder at four concentrations (0, 75, 150, and 225 mg·L^-1) on the fatty acid and amino acid compositions in brine shrimp (Artemia sp.) nauplii. The nauplii samples were taken every 6 h until 18 h. As compared with the control, the nauplii fed with Antarctic krill powder had significantly higher contents of docosahexaenoic acid, total ω3 polyunsaturated fatty acids, and total polyunsaturated fatty acids at each sampling time. Except that the eicosapentaenoic acid content in the treatments of 75 and 225 mg·L^-1 of Antarctic krill powder at the sampling time of 6 h had no significant difference with the control, the eicosapentaenoic acid content in the treatments of feeding with Antarctic krill powder at other sampling time was significantly higher than that of the control. The arachidonic acid in the treatments of 75 mg·L^-1 of Antarctic krill powder at the sampling time of 18 h and of 150 mg·L^-1 of Antarctic krill powder at the time of 12 and 18 h was also increased significantly. For amino acids, the contents of essential amino acids (EAA) or total amino acids (TAA) in the treatment of 150 mg·L^-1 of Antarctic krill powder were significantly higher than those of the control. Moreover, the EAA/TAA ratio in the treatment of 150 mg·L^-1 of Antarctic krill powder was significantly higher than that in the other three treatments. A significantly higher EAA/TAA ratio was also found in the treatment of 225 mg·L^-1 of Antarctic krill powder at the sampling time 12 h, as compared to the control. In sum, Antarctic krill powder had better effect in enriching the fatty acid and amino acid compositions in Artemia sp. nauplii, and the recommended concentration and treatment time for the enrichment were 150 mg·L^-1 and 12  or 18 h, respectively.

Key words: soil-bedrock interface, soil water content pattern, soil profile, irregular bedrock topography, Karst hillslope.