Model assessment of nutrient removal via planting Sesuvium portulacastrum in floating beds in eutrophic marine waters: t
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Model assessment of nutrient removal via planting Sesuvium portulacastrum in floating beds in eutrophic marine waters: the case of aquaculture areas of Dongshan Bay Xuehai Liu1, 4, 5, Xinming Pu1, 3, 6*, Donglian Luo2, Jing Lu1, 4, 5, Zili Liu1 1 First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China 2 Fujian Fishery Research Institute, Xiamen 361012, China 3 Laboratory of Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and
Technology (Qingdao), Qingdao 266237, China 4 Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and
Technology (Qingdao), Qingdao 266237, China 5 Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China 6 Key Laboratory of Science and Engineering for the Marine Ecological Environment, Ministry of Natural Resources,
Qingdao 266061, China Received 21 December 2018; accepted 30 May 2019 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract
Many coastal seas are severely eutrophic and required to reduce nutrient concentrations to meet a certain water quality standard. We proposed a method for nutrient removal by planting Sesuvium portulacastrum at the water surface using the floating beds in the aquaculture area of the Dongshan Bay as an example, which is an important net-cage culture base in China and where dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphate (DIP) reach 0.75 mg/L and 0.097 mg/L, respectively far exceeding China’s Grade IV water quality standards. Numerical simulations were taken using the ecological model, field observations and field plantation experimental results to assess the environmental restoration effects of planting S. portulacastrum at some certain spatial scales. Our field experiments suggested that the herbs can absorb 377 g/m2 nitrogen and 22.9 g/m2 phosphorus in eight months with an inserting density of ~60 shoot/m2. The numerical experiments show that the greater the plantation area is, the more nutrient removal. Plantation in ~12% of the study area could lower nutrients to the required Grade II standards, i.e., 0.2 mg/L
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