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Choi, S. K.,Kim, S.,Lee, K. S.,Li, W. T.,Park, S. R. Korean Ocean Research Development Institute and Ko 2016 OCEAN SCIENCE JOURNAL Vol.51 No.1
<P>The intertidal seagrass Zostera japonica, which is distributed in the intertidal and shallow subtidal zones, is exposed to nutrients from over-enriched land-based discharge and storm water runoff before they can be washed out to sea. Despite its ecological importance, only a few studies have examined the ecology and physiology of Z. japonica in northeast Asia. In this study, we investigated the productivity and tissue nutrient contents of above- and below-ground tissues to evaluate the potential role of Z. japonica in carbon capture and as a nutrient sink. The average total, above-, and below-ground productivity per shoot was 0.56, 0.34, and 0.21 mg DW shoot(-1) day(-1), respectively. Annual leaf production was 1.5 times higher than annual below-ground production. Estimated annual whole-plant carbon, nitrogen, and phosphorus incorporation based on shoot production and tissue nutrient contents was 312.8 g C m(-2) y(-1), 25.7 g N m(-2) y(-1), and 1.6 g P m(-2) y(-1), respectively. These values were equivalent to 7.8 x 10(3) kg C y(-1), 6.4 x 10(2) kg N y(-1), and 40 kg P y(-1) for all Z. japonica beds in Geoje Bay. This suggests that Z. japonica meadows can incorporate a considerable amount of carbon, nitrogen, and phosphorus in the intertidal zone. High N:P ratios of above- and below-ground tissues suggest that Z. japonica growth is probably limited by phosphorus availability in the study area.</P>