珠海外伶仃海洋牧场春季渔业资源生物碳储量初探

Preliminary study on biological carbon storage of fishery resources in Zhuhai Wailingding marine ranching in spring

海洋牧场是碳汇渔业的重要组成部分。为评估海洋牧场不同功能区的渔业资源生物储碳情况,利用珠海外伶仃海洋牧场春季拖网调查数据分析渔业资源现状,对渔业资源生物碳含量进行测定,并估算海洋牧场渔业资源生物碳储量。结果显示,珠海外伶仃海洋牧场春季渔业资源生物量为4 505.48 kg,资源密度为458.34 kg·km^(-2),资源密度比对比区高23.34%。硬骨鱼纲的渔业资源生物湿样含碳率为6.53%~17.02%,软骨鱼纲为8.55%~10.19%,甲壳纲为6.70%~11.84%,头足纲为6.48%~9.89%,双壳纲为27.04%~27.39%。珠海外伶仃海洋牧场渔业资源生物碳储量为495.63 kg,碳密度为50.42 kg·km^(-2),碳密度比对比区高46.40%;碳密度排序为:增殖放流区>新人工鱼礁区>旧人工鱼礁区>对比区。初步分析认为,应根据不同渔业资源生物含碳率的差异性,通过投放人工鱼礁、增殖放流等手段调整渔业资源结构,提高海洋牧场的储碳能力。

Marine ranching is an important component of carbon sink fisheries.In order to assess the biological carbon storage of fishery resources in different functional areas of marine ranching,based on the trawl survey data from the Zhuhai Wailing-ding marine ranching in spring,we analyzed the current status of fishery resources,measured the biological carbon content of fishery resources,and estimated the biological carbon storage of fishery resources in the marine ranching.The results show that the biomass of fishery resources in spring was 4505.48 kg;the resource density was 458.34 kg·km^(-2),which was 23.34%higher than that in the contrast area;the carbon content of wet biological samples in fishery resources was 6.53%-17.02%for Osteich-thya,8.55%-10.19%for Chondroichthya,6.70%-11.84%for Crustacea,6.48%-9.89%for Cephalopoda,and 27.04%-27.39%for Bivalva;the biological carbon storage of fishery resources of the marine ranching was 495.63 kg;the carbon density was 50.42 kg·km^(-2),which was 46.40%higher than that in the contrast area;the carbon density followed a descending trend of stock en-hancement area>new artificial reef area>original artificial reef area>contrast area.It is preliminarily suggest that according to the differences in biological carbon content among different fishery resources,the carbon storage capacity of marine ranching could be improved by adjusting the structure of fishery resources through artificial reefs,stock enhancement and other means.