The research team of SIO published a paper to explain the regulatory effect of kelp cultivation on coastal waters

Editor:admin Author:ď°Żş─■ Date:2020-04-29 Hits:2945


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       Recently, our institute's offshore ecological research team published its research achievements about the regulatory effect of kelp cultivation on coastal waters in í░Science of the Total Environmentí▒, the top international journals in the field of environmental science and ecology. It points out that kelp cultivation plays an important role in regulating offshore eutrophication and the phytoplankton community, which can effectively reduce eutrophication and acidification of water, and significantly enhances phytoplankton's diversity. As a result, kelp can be used as an alternative functional species for ecological restoration of the bay. The research findings can serve for the scientific management and control of the bay ecosystem, guide the space planning and policy making of mariculture.
      This research project was in progress in Xiangshan Bay, a semi-closed subtropical Bay has gone through 8-year long time-series monitoring of 13 voyages. The research shows that kelp harvesting would remove 297 tons of nitrogen and 42 tons of phosphorus from Xiangshan Bay annually. During the cultivation period of kelp, the concentrations of dissolved oxygen and pH increased slightly, while the concentrations of dissolved inorganic nitrogen and active phosphate decreased. The effect of kelp cultivation on moderating eutrophication of Xiangshan Bay is more obvious after deducting the input nutrient salts from the Yangtze River.
      The promotion mechanism of kelp cultivation on the ecological function of the bay ecosystem is that kelp cultivation can form aní▒ underwater forestí▒, which can weaken the dynamic force of tides, prevent the resuspension of sediments, thus ensure high transparency of sea waterúČallowing phytoplankton to absorb more visible light. As a result, phytoplankton speciesí» diversity is significantly increased, the risk of harmful red tide is decreased. What's more, it can improve the cell abundance and chlorophyll content of zooplankton. The first author of the paper is Zhibing Jiang from Key Laboratory of Marine Ecosystem Dynamics (MED), Ministry of Natural Resources. The corresponding author is Jiangning Zeng.


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