异枝江蓠对氮磷营养盐的吸收速率  

Absorption Rate of Nitrogen and Phosphorus Nutrients by Gracilaria bailinae

作　　者：钟日英 吴俊杰 赖文琪 梁雪萍 王佳滢 申玉春[2] ZHONG Riying;WU Junjie;LAI Wenqi;LIANG Xueping;WANG Jiaying;SHEN Yuchun(College of Marine Scienses,South China Agricultural University,Guangzhou 510642,China;College of Fisheries,Guangdong Ocean University,Zhanjiang Guangdong 524000,China)

机构地区：[1]华南农业大学海洋学院,广州510642 [2]广东海洋大学水产学院,广东湛江524000

出　　处：《海南热带海洋学院学报》2024年第5期51-58,共8页Journal of Hainan Tropical Ocean University

基　　金：广东海洋大学创新训练项目(CXXL2022002)。

摘　　要：异枝江蓠(Gracilaria bailinae)可吸收水体中富含氮(N)、磷(P)组分的营养盐转化为自身所需的物质,在海水养殖和海洋生态修复领域具有良好的应用前景。以NH_(4)^(+)和NO_(3)^(-)盐为N源、PO_(4)^(3-)盐为P源,考察营养盐物质的量浓度比c(NH_(4)^(+)-N)/c(PO_(4)^(3-)-P)、c(NO_(3)^(-)-N)/c(PO_(4)^(3-)-P)、c(NO_(3)^(-)-N)/c(NH_(4)^(+)-N)、c(NO_(3)^(-)-NT)/c(PO_(4)^(3-)-P)(总氮浓度为100μmol·L^(-1))对异枝江蓠4 h和3 d吸收N、P营养盐速率的影响。结果表明:异枝江蓠对N、P营养盐的吸收速率整体上随浓度比中营养盐浓度c(NO_(3)^(-)-N)、c(NH_(4)^(+)-N)、c(PO_(4)^(3-)-P)的增大而加快,在浓度比c(NH_(4)^(+)-N)/c(PO_(4)^(3-)-P)、c(NO_(3)^(-)-N)/c(PO_(4)^(3-)-P)为500/50、1000/100时,异枝江蓠分别对N营养盐4 h、3 d的吸收速率最大[20.57~24.14μmol·(h·g)-1、79.28~98.66μmol·(d·g)-1];异枝江蓠对N营养盐4 h和3 d的吸收速率均明显高于对P营养盐的吸收速率,具有显著的亲氮性。异枝江蓠对铵态氮(NH_(4)^(+)-N)3 d的吸收速率大于硝态氮(NO_(3)^(-)-N),在较长时间内它对铵态氮(NH_(4)^(+)-N)的净化效果更加显著。研究结果为异枝江蓠大规模海水养殖与海洋生态环境治理提供理论依据。Gracilaria bailinae can absorb nitrogen(N)and phosphorus(P)rich nutrient salts in the water column and convert them into their own requirements,which has good application prospects in mariculture and marine ecological resto‐ration.By using NH_(4)^(+) and NO_(3)^(-) salts as the N source and PO_(4)^(3-) salt as the P source,investigated were the effects of vari‐ous concentration ratios of NH_(4)^(+)-N:PO_(4)^(3-)-P and NO_(3)^(-)-N:PO_(4)^(3-)-P,as well as different combinations of NO_(3)^(-)-N:NH_(4)^(+)-N and NO_(3)^(-)-NT:PO_(4)^(3-)-P ratios(with a total nitrogen concentration of 100μmol·L^(-1))on the absorption rates of nitrogen(N)and phosphorus(P)by Gracilaria bailinae in 4 hours and 3 days.The results showed that the overall absorption rate of N and P nutrient salts by Gracilaria bailinae accelerated with the increase of c(NO_(3)^(-)-N),c(NH_(4)^(+)-N),or c(PO_(4)^(3-)-P)in the ratio of molar concentration.When the concentration ratios of NH_(4)^(+)-N:PO_(4)^(3-)-P and NO_(3)^(-)-N:PO_(4)^(3-)-P were 500/50 and 1000/100,the absorption rate of N nutrient salts by Gracilaria bailinae in 4 hours and 3 days was the highest,that is,20.57~24.14μmol·(h·g)-1 and 79.28~98.66μmol·(d·g)-1,which is much higher than that of P nutrient salts by Gracilaria bailinae in 4 hours and 3 days,demonstrating the nitrophilic nature of Gracilaria bailinae.The absorption rate of Ammonium nitro‐gen(NH_(4)^(+)-N)by Gracilaria bailinae is higher than that of Nitrate nitrogen(NO_(3)^(-)-N)in 3 days,and its purification effect on Ammonium nitrogen(NH_(4)^(+)-N)is more substantial in a longer period.The results of this study provide a theoretical ba‐sis for the large‐scale mariculture of Gracilaria bailinae and the management of the marine ecological environment.

关 键 词：大型海藻 异枝江蓠 氮磷营养盐 浓度比 吸收速率 

分 类 号：Q948.1[生物学—植物学]