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  • 付家想,潘科,黄凌风,蓝文陆,黎明民,李天深.氮磷水平对细基江蓠氮、磷吸收及生长的影响[J].广西科学,2022,29(3):522-531.    [点击复制]
  • FU Jiaxiang,PAN Ke,HUANG Lingfeng,LAN Wenlu,LI Mingmin,LI Tianshen.Effects of Nitrogen and Phosphorus Levels on Nitrogen and Phosphorus Absorption and Growth of Gracilaria tenuistipitata[J].Guangxi Sciences,2022,29(3):522-531.   [点击复制]
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氮磷水平对细基江蓠氮、磷吸收及生长的影响
付家想1,2, 潘科3, 黄凌风4, 蓝文陆2, 黎明民2, 李天深2
0
(1.广西科学院广西红树林研究中心, 广西红树林保护与利用重点实验室, 广西北海 536007;2.广西壮族自治区海洋环境监测中心站, 广西北海 536000;3.深圳大学高等研究院, 广东深圳 518000;4.厦门大学环境与生态学院, 福建厦门 361102)
摘要:
为了解氮(N)、磷(P)水平对细基江蓠(Gracilaria tenuistipitata)植物营养生理生态特征的影响,以亚热带大型海藻细基江蓠为原材料,研究不同N、P浓度条件下细基江蓠的生长,净化吸收N、P及其之间的相互关系。结果表明:细基江蓠的相对生长速率随着N、P浓度的增加而升高,但藻体增重幅度跟营养盐浓度不成正比,在N和P初始浓度分别为160 μmol·L-1和10 μmol·L-1时增幅最大,N、P水平和N/P明显影响细基江蓠的生长。在低N、P浓度条件下细基江蓠对N、P的去除率更高,P4组(N=64 μmol·L-1、P=4 μmol·L-1)对PO43--P去除率高达96.8%,对NH4+-N和NO3--N的去除率也表现出类似特征。细基江蓠在高N/P组对P的去除率高,在低N/P组对N的去除率高,N、P胁迫对细基江蓠的营养盐去除率有明显影响。各实验组中细基江蓠对PO43--P、NO3--N和NH4+-N的吸收速率随着初始营养盐浓度的增加而升高,分别在PO43--P初始浓度为25 μmol·L-1,无机氮(NO3--N:NH4+-N浓度比为1:1)初始浓度为200 μmol·L-1时吸收速率最大。适应富营养环境的细基江蓠倾向于按Redfield比吸收N、P,偏离Redfield比则对细基江蓠的生长有明显的抑制效应。细基江蓠对N、P高去除率的特性使其成为富营养化水质修复的潜在优良种类。
关键词:  细基江蓠      相对生长速率  吸收速率  去除率
DOI:10.13656/j.cnki.gxkx.20220720.015
投稿时间:2021-09-09
基金项目:广西科技计划项目(桂科AA17129001)和广西红树林保护与利用重点实验室开放基金项目(GKLMC-200504)资助。
Effects of Nitrogen and Phosphorus Levels on Nitrogen and Phosphorus Absorption and Growth of Gracilaria tenuistipitata
FU Jiaxiang1,2, PAN Ke3, HUANG Lingfeng4, LAN Wenlu2, LI Mingmin2, LI Tianshen2
(1.Guangxi Key Laboratory of Mangrove Protection, Guangxi Mangrove Research Center, Guangxi Academy of Sciences, Beihai, Guangxi, 536007, China;2.Marine Environmental Monitoring Center of Guangxi, Beihai, Guangxi, 536000, China;3.Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518000, China;4.College of the Environment and Ecological Science, Xiamen University, Xiamen, Fujian, 361102, China)
Abstract:
In order to understand the effects of nitrogen (N) and phosphorus (P) levels on the nutritional, physiological and ecological characteristics of Gracilaria tenuistipitata, the subtropical macro-algae G.tenuistipitata was used as raw material to study the growth, purification and absorption of N, P and their relationship under different N and P concentrations. The results showed that the relative growth rate of G.tenuistipitata increased with the increase of N and P concentrations, but the gain range of algal weight was not proportional to the concentration of nutrient. The gain range was the largest when the initial concentrations of N and P was 160 μmol·L-1 and 10 μmol·L-1, respectively. N, P levels and the ratio of N/P significantly affected the growth of G.tenuistipitata. G.tenuistipitata had a higher removal rate when N and P concentrations were low. The removal rate for PO43--P was as high as 96.8% in group P4 (N=64 μmol·L-1, P=4 μmol·L-1). The removal rates of NH4+-N and NO3--N also showed similar characteristics.The removal rate of P was high when N/P ratio was high, while the rate of N was high when N/P was low. Nutrient removal rate of G.tenuistipitata was significantly affected by N and P stress.The absorption rates of G.tenuistipitata to PO43--P, NO3--N and NH4+-N in each experimental group increased with the increase of initial nutrient concentration. The maximum absorption rate was obtained when the initial concentration of PO43--P was 25 μmol·L-1 and the initial concentration of inorganic nitrogen (NO3--N:NH4+-N concentration ratio was 1:1) was 200 μmol·L-1, respectively. G.tenuistipitata adapted to eutrophic environment tended to absorb N and P according to Redfield ratio, and deviation from Redfield ratio had obvious inhibitory effect on the growth of G.tenuistipitata. G.tenuistipitata may be potentially used for the restoration of eutrophic water quality due to their high removal rates of nitrogen and phosphorus.
Key words:  Gracilaria tenuistipitata  nitrogen and phosphorus  relative growth rate  absorption rate  removal rate

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