The assessment of carrying capacity of marine biology resources based on primary productivity methodA case study of coastal waters of Rizhao
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摘要: 资源环境承载力研究亟待突破承载阈值界定与关键参数率定的技术瓶颈,并建立一套标准化的定量评价关键技术。本研究基于“资源量−消费量”模型,通过调查与实验分析获取特定海区的初级生产力、浮游植物有机碳含量、鱼类营养级等关键参数值,采用营养动态模型和Tait沿岸海域能流模型来估算海洋生物资源总量,然后根据年人均水产品摄入量或年人均蛋白质摄入量来计算该海区海洋生物资源承载力的阈值。根据2016年对日照辖区海域的生态环境状况调查,该海域年平均初级生产力(以C计)为428.22 mg/(m2·d),浮游植物年生产量为918.51万t,鱼类、虾蟹类和头足类的平均营养级分别为3.85、3.92和3.90,利用营养动态模型计算海域渔业资源(鱼类、虾蟹类和头足类)的年生产量为3.89万t;根据Tait沿岸海域能流模型计算日照10 m等深线以内浅海的除去壳重的贝类资源量为5.50万t。按照年人均水产品摄入量为21 kg,计算出日照辖区海域的海洋生物资源承载力总和为192.86万人;按照年人均摄入蛋白质量为30 kg,计算出日照辖区海域的海洋生物资源承载力总和为16.87万人。本文建立了一项具有广泛适用性的海洋生物资源承载力定量评价技术,对科学地开发利用海洋生物资源和建立陆海统筹的资源环境承载力的监测预警机制起到积极的促进作用。Abstract: The technical bottlenecks of threshold determination and key parameter calibration in carrying capacity of resources and environment urgently need to be broken through, and then establish a standardized quantitative evaluation method. In the present study, several key parameters such as primary productivity, phytoplankton organic carbon content and trophic level were obtained through investigation and experimental analysis. The nutrition dynamic model and the Tait coastal energy flow model were used to estimate the total quantities of marine biological resources. Then, the threshold of carrying capacity of marine biological resources was calculated based on the “resource-consumption” model. For example, according to the survey results in 2016, the annual average primary productivity of sea area under Rizhao jurisdiction was 428.22 mg/(m2·d) and the annual production of phytoplankton was 9.19×106 t. Meanwhile, the average trophic levels of fishes, shrimps and crabs, and cephalopods were 3.85, 3.92 and 3.90, respectively. The annual production of fishery resources (fish, shrimp and crab, and cephalopod) in the sea area was 38.9 thousand tons calculated by the “nutritional dynamic model”. In addition, the shellfish resources in shallow sea within 10 m depth contour was 55 thousand tons calculated by the Tait coastal energy flow model. Thus, according to the annual per capita intake of aquatic products of 21 kg, the total carrying capacity of marine biological resources in Rizhao coastal waters was 1.928 6×106 people. Meanwhile, according to the annual per capita protein intake of 30 kg, the total carrying capacity of marine biological resources in Rizhao area was calculated to be 1.687×105 people. Taken together, this paper describes a quantitative assessment technique with wide applicability for carrying capacity of marine biological resources. This will contribute to substantial utilization of the marine biological resources and establishment of the monitoring and early warning of resources and environment carrying capacity in a way of overall planning of land and sea.
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表 1 2016年日照海域不同月份的叶绿素a含量
Tab. 1 The content of chlorophyll a in different months in the sea field of Rizhao in 2016
调查时间 叶绿素a含量/µg·L−1 变化范围/µg·L−1 2016年2月 0.92 0.45~1.45 2016年5月 1.41 0.85~2.21 2016年8月 1.75 0.71~2.75 2016年11月 1.13 0.32~1.85 年平均值 1.30 0.58~2.07 表 2 2016年日照海域浮游植物年生产量
Tab. 2 The annual production of phytoplankton in the sea field of Rizhao in 2016
海域 面积/km2 初级生产力(以C计)/ mg·(m2·d)−1 年初级产碳量/万t 浮游植物年生产量/万t 日照辖区的海域 6 000 428.22 93.78 918.51 10 m等深线以内的浅海 200 428.22 3.12 — 表 3 2016年日照海域的渔业资源组成
Tab. 3 The component of fishery resources in the sea field of Rizhao in 2016
统计项目 2016年2月 2016年5月 2016年8月 2016年11月 W% N% W% N% W% N% W% N% 鱼类 83.06 40.67 81.18 65.02 48.03 46.50 52.64 42.35 虾蟹类 10.47 58.92 15.78 33.43 38.72 26.31 25.34 52.92 头足类 6.47 0.42 3.05 1.55 13.25 27.19 22.01 5.73 注:W%表示渔获物的重量比例;N%表示渔获物的数量比例。 表 4 2016年11月份日照海域渔业资源的优势种及其营养级
Tab. 4 Dominant species and trophic levels of fishery resources in the sea field of Rizhao in November 2016
种类 W/% IRI TL 鱼类 尖海龙(Syngnathus acus) 6.33 2 339 3.51 六丝钝尾虾虎鱼(Amblychaeturichthys hexanema) 5.92 1 036 3.71 小黄鱼(Larimichthys polyactis) 9.06 928 3.69 矛尾虾虎鱼(Chaemrichthys stigmatias) 4.72 625 3.46 黄鮟鱇(Lophius litulon) 7.94 467 4.29 六丝矛尾虎鱼(Amblychaeturichthys hexanema) 1.98 293 4.25 皮氏叫姑鱼(Johnius belangerii) 2.04 235 4.21 细纹狮子鱼(Liparis tanakae) 3.44 115 4.23 虾蟹类 戴氏赤虾(Metapenaeopsis dalei) 6.72 4 478 3.91 口虾蛄(Oratosquilla oratoria) 10.12 1 368 4.11 鹰爪虾(Trachypenaeus curvirostris) 2.41 511 4.06 双斑蟳(Charybdis bimaculata) 2.35 348 3.39 三疣梭子蟹(Portunus trituberculatus) 1.48 121 3.31 头足类 短蛸(Octopus ocellatus) 14.67 1 433 3.92 枪乌贼(Loligo japonica) 3.87 844 3.76 长蛸(Octopus variabilis) 3.32 228 3.95 注:W%为渔获物的重量比例;IRI为渔获物的相对重要性指数;TL为渔获物的营养级。 表 5 2016年日照市海洋生物资源的自然生产量及承载力
Tab. 5 The natural production and carrying capacity of marine biology resources in the sea field of Rizhao in 2016
统计项目 平均营养级 年生产量/万t 最大可持续产量/万t 含肉率/% 蛋白质含量/% 可提供的蛋白质量/t 加权平均蛋白质量/t 承载力/万人 鱼类 3.85 4.12 2.06 67.52 17.19 2 390.98 2 120.19 7.07 虾蟹类 3.92 3.61 1.81 56.44 18.30 1 869.46 头足类 3.90 3.75 1.97 71.76 13.24 1 871.70 贝类 — 5.50 2.75 — 10.69 2 939.75 2 939.75 9.80 -
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