2017年6月在珠江口及近岸海域61个站位采集了悬浮颗粒物生物硅(BSi,biogenic silica)和叶绿素a(Chl a)。利用RAGUENEAU et al(2005)提出的碱提取法测定了悬浮颗粒物生物硅,探讨不同环境条件下BSi浓度以及碱性提取液中岩源硅(LSi,lithogenic silica)的干扰程度。结果显示,Chl a质量浓度范围为0.06~8.64 μg·L-1,悬浮颗粒物BSi浓度从低于检测限到14.3 μmol·L-1,LSi浓度范围为0.00~9.56 μmol·L-1;LSi/(LSi+BSi)比均值为0.38 mol·mol-1。提取液中测得的Si/Al比均值为2.42 mol·mol-1,与RAGUENEAU et al(2005)报道值接近。研究区域内的表层BSi反映了硅藻的生物量,与Chl a存在显著线性相关。LSi对BSi测量的干扰程度存在明显的空间差异,总体上近岸BSi和LSi高,LSi/(LSi+BSi)比低;外海BSi和LSi低,LSi/(LSi+BSi)比高;河口内BSi低,LSi高,LSi/(LSi+BSi)比高;上升流区BSi和LSi高,LSi/(LSi+BSi)比高;底层较表层具有更高的LSi和LSi/(LSi+BSi)比。最后,对常用的几种碱提取法在应用时存在的问题作了探讨。
Abstract
Particulate biogenic silica (BSi) and chlorophyll a (Chl a) were determined at 61 stations in the Pearl River Estuary and adjacent coastal waters in summer, in order to evaluate spatial variability in biogenic silica and the interference of lithogenic silica (LSi) in the bulk silica leached from the alkaline solution. Our results showed that Chl a concentrations ranged from 0.06 to 8.64 μg·L-1. Particulate BSi concentrations varied from the detect limit to 14.3 μmol·L-1, LSi concentrations were 0.00-9.56 μmol·L-1 and the average ratio of LSi to LSi+BSi was 0.38 mol·mol-1. The average ratio of Si to Al was 2.42 mol·mol-1, comparable to the value reported by RAGUENEAU et al(2005). A significant correlation was found between particulate biogenic silica and Chl a, which indicated diatom and phytoplankton biomass in the water column. LSi concentrations varied spatially, with high BSi, LSi and low LSi/(LSi+BSi) ratios in the nearshore area, low BSi, LSi and high LSi/(LSi+BSi) ratios in the offshore waters, low BSi, high LSi and high LSi/(LSi+BSi) ratios in the estuary, high BSi, LSi and high LSi/(LSi+BSi) ratios in the upwelling region. LSi and LSi/(LSi+BSi) ratios in the bottom water were higher than those in the surface water. In addition, some limitations caused by other methodologies of BSi measurements had been discussed.
关键词
生物硅 /
岩源硅 /
LSi/(LSi+BSi)比 /
Si/Al比 /
叶绿素 a /
黏土矿物
Key words
biogenic silica /
lithogenic silica /
LSi/(LSi+BSi) ratio /
Si/Al ratio /
chlorophyll a /
clay minerals
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参考文献
[1] TREGUER P, DE LA ROCHA C L. The world ocean silica cycle[J]. Annual Review of Marine Science, 2013,5:477-501.
[2] NELSON D M, TREGUER P, BRZEZINSKI M A, et al. Production and dissolution of biogenic silica in the ocean-revised global estimates, comparison with regional data and relationship to biogenic sedimentation[J]. Global Biogeochemical Cycles, 1995,9(3): 359-372.
[3] CONLEY D J. Riverine contribution of biogenic silica to the oceanic silica budget[J]. Limnology and Oceanography, 1997,42(4): 774-777.
[4] YIN Ke-dong, QIAN Pei-yuan, WU M C S, et al. Shift from P to N limitation of phytoplankton growth across the Pearl River Estuarine Plume during summer[J]. Marine Ecology Progress Series, 2001,221(4): 17-28.
[5] DEMASTER D J. The supply and accumulation of silica in the marine environment[J]. Geochimica et Cosmochimica Acta, 1981,45(10): 1 715-1 732.
[6] DEMASTER D J. The marine budgets of silica and 32Si [D]. New Haven: Yale University,1979: 1-308.
[7] MORTLOCK R A, FROELICH P N. A Simple method for the rapid-determination of biogenic opal in pelagic marine-sediments[J]. Deep Sea Research: Part I-Oceanographic Research Papers,1989,36(9): 1 415-1 426.
[8] RAGUENEAU O, TREGUER P. Determination of biogenic silica in coastal waters - Applicability and limits of the Alkaline Digestion Method[J]. Marine Chemistry, 1994,45(1-2): 43-51.
[9] RAGUENEAU O, SAVOYE N, DEL AMO Y, et al. A new method for the measurement of biogenic silica in suspended matter of coastal waters: Using Si∶Al Ratios to correct for the mineral interference[J]. Continental Shelf Research, 2005,25(5-6): 697-710.
[10] HURD D C. Interactions of biogenic Opal, sediment and seawater in the central equatorial Pacific[J]. Geochimica et Cosmochimica Acta, 1973,37(10): 2 257-2 266.
[11] EISMA D, GAAST S J V D. Determination of Opal in marine sediments by X-Ray diffraction[J]. Netherlands Journal of Sea Research, 1971,5(3): 382-389.
[12] CHESTER R, ELDERFIELD H, CHESTER R, et al. The infrared determination of Opal in siliceous deep-sea sediments [J]. Geochimica et Cosmochimica Acta, 1968,32(10): 1 128-1 140.
[13] LEINEN M. A normative calculation technique for determining Opal in deep-sea sediments[J]. Geochimica et Cosmochimica Acta, 1977,41(5): 671-676.
[14] POKRAS E M. Preservation of Fossil Diatoms in Atlantic sediment cores: Control by supply rate[J]. Deep Sea Research: Part I-Oceanographic Research Papers, 1986,33(7): 893-902.
[15] KAMATANI A, OKU O. Measuring biogenic silica in marine sediments[J]. Marine Chemistry, 2000,68(3): 219-229.
[16] LEWIN J C. The dissolution of silica from Diatom Walls[J]. Geochimica et Cosmochimica Acta, 1961,21(3-4): 182-198.
[17] BENNEKOM A J V, JANSEN J H F, GAAST S J V D, et al. Aluminium-rich Opal: An intermediate in the preservation of biogenic silica in the Zaire (Congo) deep-sea fan[J]. Deep Sea Research: Part I-Oceanographic Research Papers, 1989,36(2): 173-190.
[18] SANCHEZ G E, PANTOJA S, LANGE C B, et al. Seasonal changes in particulate biogenic and lithogenic silica in the upwelling system off concepción (～36°S), Chile, and their relationship to fluctuations in marine productivity and continental input[J]. Continental Shelf Research, 2008,28(18): 2 594-2 600.
[19] XU Jie, YIN Ke-dong, HE Lei, et al. Phosphorus limitation in the northern South China Sea during late summer: Influence of the Pearl River[J]. Deep-Sea Research: Part I-Oceanographic Research Papers, 2008,55(10): 1 330-1 342.
[20] QIN Ya-chao, WENG Huan-xin. Silicon release and its speciation distribution in the surficial sediments of the Pearl River Estuary, China[J]. Estuarine, Coastal and Shelf Science, 2006,67(3): 433-440.
[21] QIN Ya-chao, WENG Huan-xin, JIN Hai-yan, et al. Estimation of authigenic alteration of biogenic and reactive Silica in Pearl River estuarine sediments using wet-chemical digestion methods[J]. Environmental Earth Sciences, 2012,65(6): 1 855-1 864.
[22] ZHANG Lan-lan, WANG Ru-jian, CHEN Mu-hong, et al. Biogenic silica in surface sediments of the South China Sea: Controlling factors and paleoenvironmental implications[J]. Deep Sea Research: Part II- Topical Studies in Oceanography, 2015,122:142-152.
[23] LIU Yang, DAI Min-han, CHEN Wei-fang, et al. Distribution of biogenic silica in the upwelling zones in the South China Sea[J]. Advances in Geosciences, 2012,28(1): 55-65.
[24] KNAP A H, MICHAELS A F, CLOSE A R, et al. Protocols for the Joint Global Ocean Flux Study (Jgofs) core measurements[M]. Paris: UNESCO, 1994: 1-170.
[25] GRASSHOFF K, KREMLING K, EHRHARDT M. Methods of seawater analysis[M]. 3rd Edition. Wiley-VCH, 1999 : 1-600.
[26] REN Jing-ling, ZHANG Jing, LUO Jing-qing, et al. Improved fluorimetric determination of dissolved aluminium by micelle-enhanced lumogallion complex in natural waters[J]. Analyst, 2001,126(5): 698-702.
[27] FIRME G F, RUE E L, WEEKS D A, et al. Spatial and temporal variability in phytoplankton iron limitation along the California coast and consequences for Si, N, and C biogeochemistry[J]. Global Biogeochemical Cycles, 2003,17(1): 11-13 ,16.
[28] LIU Su-mei, ZHANG Jing, LI Rui-xiang. Ecological significance of biogenic silica in the East China Sea[J]. Marine Ecology Progress Series, 2005,290:15-26.
[29] RAN Xiang-bin, CHE Hong, SUN Tao, et al. Distributions and sources of particle organic carbon and biogenic silica in the Bohai Sea[J]. Acta Oceanologica Sinica, 2014, 36(10): 12-24.
冉祥滨, 车宏, 孙涛, 等. 渤海颗粒有机碳与生物硅的分布及来源[J]. 海洋学报, 2014,36(10): 12-24.
[30] TRUDNOWSKA E, GLUCHOWSKA M, BESZCZYNSKA-MOLLER A, et al. Plankton patchiness in the Polar Front Region of the West Spitsbergen Shelf[J]. Marine Ecology Progress Series, 2016,560:1-18.
[31] XU Jie, HO A Y, YIN Ke-dong, et al. Temporal and spatial variations in nutrient stoichiometry and regulation of phytoplankton biomass in Hong Kong waters: Influence of the Pearl River outflow and sewage inputs[J]. Marine Pollution Bulletin, 2008,57(6-12): 335-348.
[32] BRZEZINSKI M A, PHILLIPS D R, CHAVEZ F P, et al. Silica production in the Monterey, California, upwelling system[J]. Limnology and Oceanography, 1997,42(8): 1 694-1 705.
[33] GE Qian, CHU Feng-you, LIU Jing-pu, et al. Distribution of the clay minerals in surface sediments of the South China Sea and their provenance[J]. Marine Geology & Quaternary Geology, 2010, 30(4): 62-71.
葛倩, 初凤友, 刘敬圃, 等. 南海表层黏土矿物的分布与来源[J]. 海洋地质与第四纪地质, 2010,30(4): 62-71.
[34] SONG Ze-hua, WAN Shi-ming, HUANG Jie, et al. Distribution and sources of clay minerals in surface sediments of the northwestern South China Sea[J]. Acta Oceanologica Sinica, 2017, 39(9): 71-82.
宋泽华, 万世明, 黄杰, 等. 南海西北部表层沉积物黏土矿物分布特征及其来源[J]. 海洋学报, 2017,39(9): 71-82.
基金
国家自然科学基金项目资助(41476137)
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