| Liu Xuehai,Pu Xinming,Luo Donglian,Lu Jing,Liu Zili. 2019. Model assessment of nutrient removal via planting Sesuvium portulacastrum in floating beds in eutrophic marine waters: the case of aquaculture areas of Dongshan Bay. Acta Oceanologica Sinica, 38(12):91－100 |
| Model assessment of nutrient removal via planting Sesuvium portulacastrum in floating beds in eutrophic marine waters: the case of aquaculture areas of Dongshan Bay |
| 海马齿浮床对富营养化海湾营养盐削减的模型评价：以东山湾八尺门养殖海域为例 |
| Received:December 21, 2018 |
| DOI：10.1007/s13131-019-1492-5 |
| Key words:phytoremediaton Sesuvium portulacastrum ecological model nutrient removal |
| 中文关键词: 植物修复 海马齿 生态模型 营养盐削减 |
| 基金项目:The Public Science and Technology Research Funds Projects of Ocean under contract Nos 201305043 and 201205009; the National Basic Research Program (973 Program) of China under contract No. 2015CB755904; the National Natural Science Foundation of China under contract No. 41276036. |
| Author Name | Affiliation | E-mail | | Liu Xuehai | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China | | | Pu Xinming | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory of Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Key Laboratory of Science and Engineering for the Marine Ecological Environment, Ministry of Natural Resources, Qingdao 266061, China | xmpu@fio.org.cn | | Luo Donglian | Fujian Fishery Research Institute, Xiamen 361012, China | | | Lu Jing | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China | | | Liu Zili | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | |
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| 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 < DIN≤0.3 mg/L and 0.015 mg/L < DIP≤0.03 mg/L. Here the phytoremediation method and results provide helpful references for environmental restoration in other eutrophic seas. |
| 中文摘要: |
| 很多近岸养殖海域水体呈严重富营养化状态，迫切需要降低营养盐浓度以符合水质标准。本文提出通过在海面浮床上种植海马齿的方法来削减营养盐。以中国重要的网箱养殖基地东山湾八尺门养殖区为例，调查显示其无机氮和磷酸盐分别达到0.75 mg/l和0.097 mg/l，均远超中国四类海水水质标准。本文利用研究海域的调查数据、现场种植实验结果及生态模型，通过数值模拟评估了不同规模情况下海马齿浮床的环境修复效果。现场种植实验结果表明：海马齿在约60株/m2幼苗的栽种密度下，8个月内每平方米浮床能吸收377 g氮和22.9 g磷。数值实验结果表明：海马齿的种植面积越大，对营养盐的削减效果越明显；占研究海区面积约12%的海马齿浮床可使营养盐削减到符合养殖要求的二类水质标准。通过海马齿浮床消减营养盐为富营养化海域提供了环境修复的途径，利用生态模型可以评估其潜在的修复效果。 |
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