Journal of Tropical Oceanography >
Response of phytoplankton community to atmospheric deposition along Pearl River plume front
Received date: 2019-10-15
Request revised date: 2020-01-06
Online published: 2020-07-27
Supported by
Foundation item: National Natural Science Foundation of China(41676108)
Project of State Key Laboratory of Tropical Oceanography(LTOZZ1705)
Project of State Key Laboratory of Tropical Oceanography(LTOZZ1803)
Copyright
The Pearl River plume water can form an active plume front along the coastal northern South China Sea. A higher biomass of phytoplankton could exist along the plume front affected by hydrological factors. Atmospheric deposition from land-source input has a significant impact on the ecosystem of the Pearl River Delta zone. A field survey at the western part of the Pearl River Estuary was conducted in March 2019. Substantial variations of size-fractionation phytoplankton community and picoplankton were determined along a section, which affected by the plume front. Meanwhile, atmospheric deposition amendment experiments of three stations, covering different regions of the plume front, were conducted. Results showed that the size-fractionation phytoplankton community was dominated by microphytoplankton at the shore side of the front, picophytoplankton at the sea side of the front, and evenly distributed at the frontal zone with relatively higher biomass. At the frontal zone, the total phytoplankton community was limited by Nitrogen, while the Synechococcus showed a Phosphorus-limitation. Species among the frontal zone could show different nutrients demands. Atmospheric dry or wet deposition could stimulate the growth of three size-fractionation phytoplankton community. The microphytoplankton showed higher growth rate with atmospheric dry or wet amendments at shore side or sea side of the front, while the growth of three size-fractionation phytoplankton community could be stimulated indistinguishably. The addition of atmospheric deposition significantly stimulated the growth of Picoeukaryotes in the frontal system and of Synechococcus at the shore side of the front. Inhibited effects on Synechococcus and Prochlorococcus were found at the frontal zone and sea side of the front.
ZHOU Weiwen , LI Qian , GE Zaiming , LIU Zijia , SHUAI Yiping , MA Mengzhen . Response of phytoplankton community to atmospheric deposition along Pearl River plume front[J]. Journal of Tropical Oceanography, 2020 , 39(4) : 50 -60 . DOI: 10.11978/2019101
表1 大气沉降样品的营养盐以及痕量金属浓度Tab. 1 Nutrients and trace metal concentrations of filtered rainwater (FRW) and the leachate solution from aerosol particle (AP) |
样品 | 营养盐/(μmol·L-1) | 痕量金属/(nmol·L-1) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
DIN | DIP | Al | Cu | As | Cd | Fe | Ni | Co | Cr | Pb | Mn | ||
气溶胶滤液(AP) | 6.7 | 0.13 | 104 | 3.6 | 0.76 | 0.38 | 5.0 | 1.4 | 0.14 | 0.25 | 2.3 | 12.2 | |
过滤雨水(FRW) | 8.3 | 0.12 | 105 | 3.9 | 2.20 | 0.03 | 3.0 | 1.3 | 0.05 | 0.31 | 1.1 | 3.4 |
表2 现场营养盐及大气沉降添加的终浓度Tab. 2 Description of different treatments during incubations |
实验组 | 添加成分的终浓度 |
---|---|
对照组 | 无添加 |
+N | 4.2μmol·L-1 |
+P | 0.25μmol·L-1 |
+NP | 4.2μmol·L-1(NaNO3)、0.25μmol·L-1(NaH2PO4) |
+AP | 4.2mg·L-1 |
+FRW | 10%(体积比例) |
注: +N为加氮组, +P为加磷组, +NP为加氮磷组, +AP为加气溶胶组, +FRW为加过滤雨水组 |
图3 研究区表层水体的温度分布Fig. 3 Distribution of surface temperature in the northern South China Sea |
表3 培养站位不同水深的水文及生物参数Tab. 3 Hydrographic and biological parameters of the incubation stations |
参数 | S1 | S3 | S8 | |||||||
---|---|---|---|---|---|---|---|---|---|---|
2m | 25m | 2m | 10m | 38m | 2m | 64m | ||||
温度/oC | 22.6 | 22.4 | 22.9 | 22.4 | 22.6 | 25.1 | 23.1 | |||
盐度/‰ | 30.3 | 34.1 | 32.8 | 33.5 | 34.5 | 34.4 | 34.5 | |||
叶绿素a浓度/(µg·L-1) | 1.0 | 0.8 | 1.3 | 2.7 | 0.6 | 0.2 | 0.8 | |||
分粒径浮游植物 百分比/% | 小型(Micro) | 20 | 38 | 22 | 30 | 43 | 1 | 6 | ||
微型(Nano) | 38 | 32 | 35 | 53 | 44 | 13 | 25 | |||
微微型(Pico) | 42 | 30 | 43 | 17 | 13 | 86 | 69 | |||
微微型浮游植物细胞丰度/(×103mL-1) | 聚球藻Synechococcus | 16.3 | 3.4 | 119.7 | 133.5 | 31.4 | 21.2 | 19.0 | ||
原绿球藻Prochlorococcus | — | — | — | — | — | 127.2 | 52.2 | |||
真核浮游植物Picoeukaryotes | 5.7 | 0.9 | 8.4 | 12.6 | 8.0 | 0.6 | 3.7 |
注: “—”表示没有检测到该类型浮游植物 |
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