摘要
为探索细基江蓠繁枝变型(Gracilaria.tenuistipitata var.liui)和菊花江蓠(G.lichevoides)在低盐养殖水体中的营养盐吸收利用和净化效果,以半咸水池塘养殖尾水(盐度6.7‰~23.5‰,无机氮1.07~2.39 mg/L,无机磷0.075~0.12 mg/L)为处理对象,以网箱养殖区海水(盐度32.1‰,无机氮0.53 mg/L,无机磷0.036 mg/L)为对照,构建细基江蓠繁枝变型和菊花江蓠的静水处理系统,比较和分析2种江蓠在低盐高营养(半咸水养殖尾水T1、T2、T3)和高盐低营养(对照海水T4)条件下的水质净化效果和营养盐吸收特性。处理20 d后,各养殖水体中无机氮、磷盐含量基本趋于稳定。在半咸水处理中,细基江蓠繁枝变型和菊花江蓠无机氮去除率分别为78.1%~88.3%和76.9%~88.5%,显著高于对照处理(68.8%和70.0%);无机磷去除率分别为51.6%~82.7%和54.7%~68.5%,显著高于对照处理(25.5%和31.6%);相对生长速率(RGR)分别为1.753%~3.081%和3.909%~4.840%,高于对照处理(1.478%和3.722%)。在3个半咸水处理间,细基江蓠繁枝变型在T2尾水(盐度14.1‰)中无机氮、磷去除率最高(P<0.05),菊花江蓠在T3尾水(盐度6.7‰)中无机氮、磷去除率最高(P<0.05)。研究结果表明,细基江蓠繁枝变型和菊花江蓠在不同盐度和氮磷负荷的养殖水体中都具有较好的无机氮、磷去除率;菊花江蓠RGR显著高于细基江蓠繁枝变型,且在高盐(32.1‰)和低盐(6.7‰)养殖水体中的营养盐去除率也较高,说明菊花江蓠在一定程度上对不同氮、磷水平和盐度变化具有更好的适应能力。研究可为江蓠在海水和半咸水净化系统中的应用提供参考。
In this study,we studied nutrient absorption and bioremediation by two Gracilaria macroal-gae species(Gracilaria tenuistipitata var.liui and Gracilaria lichevoides)on low salinity aquaculture water.Semi-saline aquaculture effluent(salinity 6.7‰-23.5‰,dissolved inorganic nitrogen(DIN)1.07-2.39 mg/L,dissolved inorganic phosphorus(DIP)0.075-0.12 mg/L)was used in the investigation,and three water treatments and a control were set:T1,100%effluent(40 L undiluted aquaculture pond ef-fluent;T2,50%effluent(20 L pond effluent and 20 L clean freshwater);T3,25%effluent,(10 L pond ef-fluent and 30 L clean freshwater);T4,control(seawater from the cage culture area:salinity,32.1‰;DIN 0.53 mg/L,DIP,0.036 mg/L).The water purification effects and nutrient absorption characteristics of the two Gracilaria species were compared and analyzed under low-salinity high-nutrient conditions(semi-sa-line pond effluent T1,T2,T3)and high-salinity low-nutrient conditions(seawater control,T4).After 20 days,the DIN and DIP concentrations in each treatment tended to stabilize.In the semi-saline water treat-ments,the DIN removal rates by G.tenuistipitata var.liui and G.lichevoides were in the ranges of 78.1%-88.3%and 76.9%-88.5%,respectively,significantly higher than those in the control(68.8%and 70.0%),and the DIP removal rates were in the ranges of 51.6%-82.7%and 54.7%-68.5%,respectively,significantly higher than in the control(25.5%and 31.6%).The relative growth rates(RGR)of G.tenuis-tipitata var.liui and G.lichevoides were in the ranges of 1.753%-3.081%and 3.909%-4.840%,respec-tively,higher than the control treatment(1.478%and 3.722%).Among the three semi-saline water treat-ments,G.tenuistipitata var.liui showed the highest DIN and DIP removal rates in T2(salinity 14.1‰)(P<0.05),while G.lichevoides showed the highest DIN and DIP removal rates in T3(salinity 6.7‰)(P<0.05).The results indicate that both G.tenuistipitata var.liui and G.lichevoides effectively absorb DIN and DIP in aquaculture water of varying salinity and nitrogen-phosphorus loading.Additionally,the RGR of G.lichevoides was significantly higher than that of G.tenuistipitata var.liui,and the nutrient re-moval rates of G.lichevoides in high salinity(32.1‰)and low salinity(6.7‰)water bodies were both higher,indicating that G.lichevoides adapted better to different nutrient and salinity levels.This study pro-vides a reference for the use of Gracilaria in seawater and brackish water purification systems.
作者
李婷
张文文
李俊伟
陈素文
颉晓勇
张菀铃
LI Ting;ZHANG Wenwen;LI Junwei;CHEN Suwen;XIE Xiaoyong;ZHANG Wanling(South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Laboratory of South China Sea Fishery Resources Development and Utilization,Ministry of Agriculture and Rural Affairs/Guangdong Provincial Key Laboratory of Fishery Ecology and Environment,Guangzhou 510300,P.R.China;Sanya Tropical Fisheries Research Institute,Key Laboratory of Efficient Utilization and Processing of Marine Fishery Resources of Hainan Province,Sanya 572000,P.R.China;School of Life Science,Huizhou University,Huizhou 516000,P.R.China;College of Fisheries Science and Life Science of Shanghai Ocean University,Shanghai 201306,P.R.China)
出处
《水生态学杂志》
北大核心
2025年第5期235-245,共11页
Journal of Hydroecology
基金
海南省自然科学基金(323QN329)
广东省重点领域研发计划(2020B1111030002)
深圳市科技计划(KCXST20221021111206015)。
关键词
江蓠
养殖尾水
生物净化
无机氮
大型海藻
Gracilaria
aquaculture wastewater
bioremediation
inorganic nitrogen
macroalgae
