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于2015年1—12月对杭州湾北部沿岸碧海金沙围隔海域水环境质量进行每月一次的跟踪监测,进行围隔海域水质分析评价,通过调查底栖浒苔群落的种类组成及其生物量,评估其对围隔海域水质的修复能力。根据富营养化状态指数(E)表明,2015年该围隔海域1—9月份属于高富营养化状态,10—12月份属于富营养化状态,其中溶解无机氮(DIN)全年平均为(0.91±0.11)mg/L,属劣Ⅳ类海水水质标准;溶解无机磷(DIP)全年平均为(0.031±0.005)mg/L,属Ⅲ类海水水质标准;根据有机污染指数(A)显示,2015年该围隔海域2—7月份开始受到有机污染,8月、9月和12月属于轻度有机污染,10月和11月属于中度有机污染。底栖浒苔类的优势种为曲浒苔(Ulva flexuosa),占底栖藻场总生物量的97.3%。2015年3月至12月碧海金沙围隔海域底栖曲浒苔全年总生物量净增长量为1 497.3 t,实验测得曲浒苔组织内总氮(TN)和总磷(TP)平均含量分别为3.50%±0.02%和0.13%±0.01%(干重),全年吸收水体中氮和磷量分别为(4 354.90±46.78)kg和(161.75±1.74)kg。分析表明,碧海金沙围隔海域天然曲浒苔种群通过同化养殖水体中氮磷,具备一定的水质修复能力,但尚未平衡由水产养殖活动造成的营养负荷。因此,在近岸海水养殖海域,除需进行底栖海藻场的构建外,还需要调整养殖结构,如增加大型海藻栽培以建立多营养层次的综合养殖模式(IMTA),实现近岸海水养殖产业的可持续发展。
From January to December 2015, the monthly water quality of the seawater in Jinsha seawater area along the northern coast of Hangzhou Bay was monitored and monitored. The water quality in the enclosed sea area was analyzed and evaluated. By investigating the species composition and biomass , Assess their ability to repair the water quality in the sea area. According to the eutrophication status index (E), it shows that in 2015, the enclosed waters are highly eutrophic from January to September and eutrophic from October to December. The average annual dissolved inorganic nitrogen (DIN) is 0.91 ± 0.11) mg / L, which is a quality standard for Class IV seawater. The average annual dissolved inorganic phosphorus (DIP) concentration was (0.031 ± 0.005) mg / L, which is a Class III standard for seawater quality. According to the organic pollution index (A) In 2015, the enclosed waters started to be organic contaminated from February to July, with mild organic pollution in August, September and December, and moderate organic pollution in October and November. The dominant species of the endangered Enteromorpha species was Ulva flexuosa, accounting for 97.3% of the total biomass of the benthic algae. From March to December 2015, the net increment of total biomass of endangered Enteromorpha species in the sea area around the Sands of the Blue Sea was 1 497.3 t. The average total nitrogen (TN) and total phosphorus (TP) in the Enteromorpha species The content of nitrogen and phosphorus in the absorbing water body were (4 354.90 ± 46.78) kg and (161.75 ± 1.74) kg respectively in 3.50% ± 0.02% and 0.13% ± 0.01% (dry weight) The analysis showed that the population of Natural Enteromorpha species from the sea of Jinsha around the Sea had some water quality restoration ability through assimilating nitrogen and phosphorus in the water body, but the nutrition load caused by aquaculture activities had not been balanced yet. Therefore, in the coastal marine aquaculture waters, in addition to benthic marine algae field construction, but also need to adjust the aquaculture structure, such as the increase of large-scale cultivation of algae to establish a multi-nutrient integrated aquaculture mode (IMTA), to achieve coastal aquaculture industry Sustainable development.