不同条件下羊栖菜溶解有机碳(DOC)分泌特征

doi:10.14012/j.cnki.fjsc.2023.03.007

摘要/Abstract

摘要：

羊栖菜(Sargassum fusiforme)是一种生长在暖温带至亚热带的褐藻门马尾藻科马尾藻属植物。温州洞头被称作 “中国羊栖菜之乡”。为明确羊栖菜在养殖过程中溶解有机碳(DOC)分泌特征,研究设置了盐度、光照强度、pH、水体中总无机氮浓度、水体中总磷酸盐浓度等不同梯度处理,并进行了模拟养殖实验;测定了养殖水体中DOC、溶解无机碳(DIC)浓度,并对其变化速率进行了分析。结果显示:羊栖菜中苗的DOC分泌速率最高;在光照强度2 800 lx下,羊栖菜小苗DOC分泌速率和DIC固定速率均最高;在原海水盐度30、pH 8、总无机氮浓度1 mg/L、总磷酸盐浓度0.02 mg/L条件下,羊栖菜小苗DOC分泌速率达到最高;光照强度、盐度、pH、总无机氮浓度、总磷酸盐浓度等环境因素均对羊栖菜DOC的分泌产生影响,不同因素间的影响有一定的差异。

关键词: 羊栖菜, 溶解有机碳, 溶解无机碳, 分泌速率

Abstract:

Sargassum fusiforme is a kind of Sargassum plant of Sargassaceae of Phaeophyta,which grows in the warm temperate zone to the subtropical zone.Dongtou is called “China’s Hometown of Sargassum fusiforme”.In order to clarify the characteristics of dissolved organic carbon (DOC) secretion of S.fusiforme in the process of aquaculture,different gradient treatments such as salinity,light intensity,pH,total inorganic nitrogen concentration in water and total phosphate concentration in water were set up,while simulated aquaculture experiments were carried out.The content of DOC and dissolved inorganic carbon (DIC) in the aquaculture water were measured,and their change rates were analyzed.The results showed that the DOC secretion rate of S.fusiforme medium seedlings was the highest.Under the light intensity of 2 800 lx,the DOC secretion rate and the DIC fixation rate of S.fusiforme small seedlings were the highest.Under the conditions of original seawater salinity of 30,pH of 8,total inorganic nitrogen concentration of 1 mg/L,and total phosphate concentration of 0.02 mg/L,S.fusiforme had the highest DOC secretion rate.Light intensity,salinity,pH,total inorganic nitrogen concentration,total phosphate concentration and other environmental factors all affected the DOC secretion of S.fusiforme,and the effects of different factors were certain difference.

Key words: Sargassum fusiforme, dissolved organic carbon, dissolved inorganic carbon, secretion rate

中图分类号:

S931.1

周庆澔, 许曹鲁, 权伟. 不同条件下羊栖菜溶解有机碳(DOC)分泌特征[J]. 渔业研究, 2023, 45(3): 271-279.

ZHOU Qinghao, XU Caolu, QUAN Wei. Research on dissolved organic carbon (DOC) secretion of Sargassum fusiforme under different conditions[J]. Journal of Fisheries Research, 2023, 45(3): 271-279.

图/表 13

表1 海水基本理化参数背景值

Tab.1 Background values of basic physical and chemical parameters of seawater

菜苗 Sprouts	酸碱度 pH	溶解氧 /mg·L^-1 DO	盐度 Salinity	比重/st Specific gravity	铵态氮 /mg·L^-1 N $H 4 +$ -N	硝酸盐 /mg·L^-1 Nitrate	磷酸盐 /mg·L^-1 Phosphate	溶解有机碳/mg·L^-1 DOC	溶解无机碳/mg·L^-1 DIC
第一次 First time	7.56±0.044	9.70±1.204	30.15±0.957	23.77±0.776	0.256±0.005	1.05±0.053	0.021±0.005	5.62±0.180	23.73±0.896
第二次 Second time	7.72±0.227	9.62±0.156	28.82±0.157	20.15±0.121	0.174±0.013	1.01±0.079	0.034±0.004	2.05±0.061	24.75±0.624

表1 海水基本理化参数背景值

Tab.1 Background values of basic physical and chemical parameters of seawater

菜苗 Sprouts	酸碱度 pH	溶解氧 /mg·L^-1 DO	盐度 Salinity	比重/st Specific gravity	铵态氮 /mg·L^-1 N $H 4 +$ -N	硝酸盐 /mg·L^-1 Nitrate	磷酸盐 /mg·L^-1 Phosphate	溶解有机碳/mg·L^-1 DOC	溶解无机碳/mg·L^-1 DIC
第一次 First time	7.56±0.044	9.70±1.204	30.15±0.957	23.77±0.776	0.256±0.005	1.05±0.053	0.021±0.005	5.62±0.180	23.73±0.896
第二次 Second time	7.72±0.227	9.62±0.156	28.82±0.157	20.15±0.121	0.174±0.013	1.01±0.079	0.034±0.004	2.05±0.061	24.75±0.624

图1 不同生长阶段羊栖菜DOC分泌速率与DIC固定速率

Fig.1 DOC secretion rate and DIC fixation rate of S. fusiform in different growth stages

图2 不同生长阶段羊栖菜DOC分泌量占固碳量的比例

Fig.2 Proportion of DOC secreted by S. fusiform in carbon fixation in different growth stages

图3 不同光照强度下羊栖菜小苗的DOC分泌速率与DIC固定速率

Fig.3 DOC secretion rate and DIC fixation rate of s. fusiform small seedlings under different light intensity

图4 不同光照强度下羊栖菜小苗的DOC分泌量占固碳量的比例

Fig.4 Proportion of DOC secretion to carbon fixation of S. fusiform small seedlings under different light intensity

图5 不同盐度下羊栖菜小苗的DOC分泌速率与DIC固定速率

Fig.5 DOC secretion rate and DIC fixation rate ofS. fusiform small seedlings under different salinity

图6 不同盐度下羊栖菜小苗的DOC分泌量占固碳量的比例

Fig.6 Proportion of DOC secretion to carbon fixationof S. fusiform small seedlings under different salinity

图7 不同pH下羊栖菜小苗的DOC分泌速率与DIC固定速率

Fig.7 DOC secretion rate and DIC fixate on rate of S. fusiform small seedlings under different pH

图8 不同pH下羊栖菜小苗的DOC 分泌量占固碳量的比例

Fig.8 Proportion of DOC secretion to carbon fixation of S. fusiform small seedlings under different pH

图9 不同总无机氮浓度下羊栖菜小苗的DOC分泌速率与DIC固定速率

Fig.9 DOC secretion rate and DIC fixation rate ofs. fusiform small seedlings under differ ent total inorganic nitrogen concentrations

图10 不同总无机氮浓度下羊栖菜小苗的DOC分泌量占固碳量的比例

Fig.10 Proportion of DOC secretion td carbon fixation of S. fusiform small seedlings under different total inorganic nitrogen concentrateons

图11 不同总磷酸盐浓度下羊栖菜小苗的DOC分泌速率与DIC固定速率

Fig.11 DOC secretion rate and DIC fixation rate of S. fusiform small seedlings under different total phosphate concentrations

图12 不同总磷酸盐浓度下羊栖菜小苗的DOC分泌量占固碳量的比例

Fig.12 Proportion of DOC secretion to carbonfixation of S. fusiform small seedlings under different total phosphate concentrations

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