南极南设得兰群岛附近海域表层沉积物中有色溶解有机物的分布特征及来源分析
|
摘要
在南极南设得兰群岛附近海域采集了6个表层沉积物样品,测定了提取液中溶解有机物(DOM)的有机碳含量、紫外-可见吸收光谱和三维荧光光谱,并对有色溶解有机物(CDOM)的分子量信息及各荧光组分的成分和来源进行了分析。结果表明,南设得兰群岛附近海域表层沉积物中DOM提取液的溶解有机碳(DOC)及沉积物有机碳(SOC)的含量呈现由近岸向开阔海域递减的趋势,紫外-可见吸收光谱中的吸收系数(a)也表现出了相似的性质,光谱斜率比(SR)表明近岸沉积物CDOM老化程度较强。通过对三维荧光光谱的分析可知,南设得兰群岛附近海域表层沉积物中的CDOM包含3种荧光组分,即类色氨酸、海洋类腐殖质和陆源类腐殖质,表现出较强的自生源特征,整个研究海域CDOM来源以内源为主,受陆生植物和土壤有机质的外源输入影响较小。通过CDOM各参数的相关性分析发现,沉积物DOM提取液的DOC含量与SOC含量以及吸收系数和腐殖化指数(HIX)等参数相互之间都呈显著正相关,相关系数(r)均在0.88以上,显著性水平P<0.01。
Six surface sediment samples were collected from the sea area surrounding the South Shetland Islands in Antarctica. The UV-Visible absorption spectrum and three-dimensional fluorescence spectroscopy of the chromophoric dissolved organic matter( CDOM) in the sediment extraction liquid were analyzed. Moreover,the molecular weights,fluorescence components,and sources of the DOM were discussed. The results showed that the contents of DOC and sediment OC,values of the absorption coefficients( a),and aging degree of the spectral slope ratio( SR)of the inshore samples were higher than the offshore samples. The three-dimensional fluorescence spectroscopy for all sampling sites indicated that CDOM in the extraction liquid comprised three fluorescent components: tryptophanlike,marine humic-like,and terrestrial humic-like material. The humic-like components of CDOM were derived mainly from autochthonous sources. Significant linear relationships between the contents of DOC,contents of sediment OC,values of the absorption coefficients( a280,a355 and a440),and HIX were observed,for which the correlation coefficients( r) were all > 0. 88( P < 0. 01).
Six surface sediment samples were collected from the sea area surrounding the South Shetland Islands in Antarctica. The UV-Visible absorption spectrum and three-dimensional fluorescence spectroscopy of the chromophoric dissolved organic matter( CDOM) in the sediment extraction liquid were analyzed. Moreover,the molecular weights,fluorescence components,and sources of the DOM were discussed. The results showed that the contents of DOC and sediment OC,values of the absorption coefficients( a),and aging degree of the spectral slope ratio( SR)of the inshore samples were higher than the offshore samples. The three-dimensional fluorescence spectroscopy for all sampling sites indicated that CDOM in the extraction liquid comprised three fluorescent components: tryptophanlike,marine humic-like,and terrestrial humic-like material. The humic-like components of CDOM were derived mainly from autochthonous sources. Significant linear relationships between the contents of DOC,contents of sediment OC,values of the absorption coefficients( a280,a355 and a440),and HIX were observed,for which the correlation coefficients( r) were all > 0. 88( P < 0. 01).
引文
1蔡明红,何剑锋,郑淑娴.极区海域海冰内部有机物质研究进展[J].极地研究,2006,18(4):282-289.
2 McM ahon K W,Ambrose W G Jr,Johnson B J,et al.Benthic community response to ice algae and phytoplankton in Nylesund,Svalbard[J].Marine Ecology Progress Series,2006,310:1-14.
3 Hansell D A,Carlson C A.Biogeochemistry of Marine Dissolved Organic Matter[M].2nd ed.New York:Academic Press,2014.
4 Hopkinson C S,Vallino J J.Efficient export of carbon to the deep ocean through dissolved organic matter[J].Nature,2005,433(7022):142-145.
5 Opsahl S,Benner R.Distribution and cycling of terrigenous dissolved organic matter in the ocean[J].Nature,1997,386(6224):480-482.
6陈同斌,陈志军.土壤中溶解性有机质及其对污染物吸附和解吸行为的影响[J].植物营养与肥料学报,1998,4(3):201-210.
7 Baker A.Fluorescence properties of some farm wastes:implications for water quality monitoring[J].Water Research,2002,36(1):189-195.
8 Coble P G.Characterization of marine and terrestrial DOM in seawater using excitation-emission matrix spectroscopy[J].Marine Chemistry,1996,51(4):325-346.
9 Du C F,Shang S L,Dong Q,et al.Characteristics of chromophoric dissolved organic matter in the nearshore waters of the western Taiwan Strait[J].Estuarine,Coastal and Shelf Science,2010,88(3):350-356.
10郭卫东,黄建平,洪华生,等.河口区溶解有机物三维荧光光谱的平行因子分析及其示踪特性[J].环境科学,2010,31(6):1419-1427.
11 Pagano T,Ross A D,Chiarelli J,et al.Multidimensional fluorescence studies of the phenolic content of dissolved organic carbon in humic substances[J].Journal of Environmental Monitoring,2012,14(3):937-943.
12蔡明红,肖宜华,王峰,等.北极孔斯峡湾表层沉积物中溶解有机质的来源与转化历史[J].海洋学报,2012,34(6):102-113.
13于培松,扈传昱,朱根海,等.南极普里兹湾海域颗粒有机碳的变化特征[J].海洋学报,2011,33(4):181-186.
14刘瑞娟,于培松,扈传昱,等.南极普里兹湾沉积物中有机碳和总氮的含量与分布[J].海洋学报,2014,36(4):118-125.
15 Ohno T,Bro R.Dissolved organic matter characterization using multiway spectral decomposition of fluorescence landscapes[J].Soil Science Society of America Journal,2006,70(6):2028-2037.
16 Khim B K,Yoon H I,Kang C Y,et al.Unstable climate oscillations during the Late Holocene in the Eastern Bransfield Basin,Antarctic Peninsula[J].Quaternary Research,2002,58(3):234-245.
17 Green S A,Blough N V.Optical absorption and fluorescence properties of chromophoric dissolved organic matter in natural waters[J].Limnology and Oceanography,1994,39(8):1903-1916.
18 Hong H S,Wu J Y,Shang S L,et al.Absorption and fluorescence of chromophoric dissolved organic matter in the Pear l River Estuary,South China[J].Marine Chemistry,2005,97(1-2):78-89.
19 Helms J R,Stubbins A,Ritchie J D,et al.Absorption spectral slopes and slope ratios as indicators of molecular weight,source,and photo bleaching of chromophoric dissolved organic matter[J].Limnology and Oceanography,2008,53(3):955-969.
20 Stedmon C A,Markager S,Bro R.Tracing dissolved organic matter in aquatic environments using a new approach to fluorescence spectroscopy[J].Marine Chemistry,2003,82(3-4):239-254.
21郝玉,龙江平.北极楚科奇海海底表层沉积物有机碳的生物地球化学特征[J].海洋科学进展,2007,25(1):63-72.
22 Parlanti E,W9rz K,Geoffroy L,et al.Dissolved organic matter fluorescence spectroscopy as a tool to estimate biological activity in a coastal zone submitted to anthropogenic inputs[J].Organic Geochemistry,2000,31(12):1765-1781.
23 Stedmon C A,Markager S.Tracing the production and degradation of autochthonous fractions of dissolved organic matter by fluorescence analysis[J].Limnology and Oceanography,2005,50(5):1415-1426.
24 Stedmon C A,Markager S.Resolving the variability in dissolved organic matter fluorescence in a temperate estuary and its catchment using PARAFAC analysis[J].Limnology and Oceanography,2005,50(2):686-697.
25 Huguet A,Vacher L,Relexans S,et al.Properties of fluorescent dissolved organic matter in the Gironde Estuary[J].Organic Geochemistry,2009,40(6):706-719.
26 Zhang Y L,Zhang E L,Yin Y,et al.Characteristics and sources of chromophoric dissolved organic matter in lakes of the Yungui Plateau,China,differing in trophic state and altitude[J].Limnology and Oceanography,2010,55(6):2645-2659.
27 McK night D M,Boyer E W,Westerhoff P K,er al.Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity[J].Limnology and Oceanography,2001,46(1):38-48.
28 Cory R M,McK night D M.Fluorescence spectroscopy reveals ubiquitous presence of oxidized and reduced quinones in dissolved organic matter[J].Environmental Science&Technology,2005,39(21):8142-8149.
2 McM ahon K W,Ambrose W G Jr,Johnson B J,et al.Benthic community response to ice algae and phytoplankton in Nylesund,Svalbard[J].Marine Ecology Progress Series,2006,310:1-14.
3 Hansell D A,Carlson C A.Biogeochemistry of Marine Dissolved Organic Matter[M].2nd ed.New York:Academic Press,2014.
4 Hopkinson C S,Vallino J J.Efficient export of carbon to the deep ocean through dissolved organic matter[J].Nature,2005,433(7022):142-145.
5 Opsahl S,Benner R.Distribution and cycling of terrigenous dissolved organic matter in the ocean[J].Nature,1997,386(6224):480-482.
6陈同斌,陈志军.土壤中溶解性有机质及其对污染物吸附和解吸行为的影响[J].植物营养与肥料学报,1998,4(3):201-210.
7 Baker A.Fluorescence properties of some farm wastes:implications for water quality monitoring[J].Water Research,2002,36(1):189-195.
8 Coble P G.Characterization of marine and terrestrial DOM in seawater using excitation-emission matrix spectroscopy[J].Marine Chemistry,1996,51(4):325-346.
9 Du C F,Shang S L,Dong Q,et al.Characteristics of chromophoric dissolved organic matter in the nearshore waters of the western Taiwan Strait[J].Estuarine,Coastal and Shelf Science,2010,88(3):350-356.
10郭卫东,黄建平,洪华生,等.河口区溶解有机物三维荧光光谱的平行因子分析及其示踪特性[J].环境科学,2010,31(6):1419-1427.
11 Pagano T,Ross A D,Chiarelli J,et al.Multidimensional fluorescence studies of the phenolic content of dissolved organic carbon in humic substances[J].Journal of Environmental Monitoring,2012,14(3):937-943.
12蔡明红,肖宜华,王峰,等.北极孔斯峡湾表层沉积物中溶解有机质的来源与转化历史[J].海洋学报,2012,34(6):102-113.
13于培松,扈传昱,朱根海,等.南极普里兹湾海域颗粒有机碳的变化特征[J].海洋学报,2011,33(4):181-186.
14刘瑞娟,于培松,扈传昱,等.南极普里兹湾沉积物中有机碳和总氮的含量与分布[J].海洋学报,2014,36(4):118-125.
15 Ohno T,Bro R.Dissolved organic matter characterization using multiway spectral decomposition of fluorescence landscapes[J].Soil Science Society of America Journal,2006,70(6):2028-2037.
16 Khim B K,Yoon H I,Kang C Y,et al.Unstable climate oscillations during the Late Holocene in the Eastern Bransfield Basin,Antarctic Peninsula[J].Quaternary Research,2002,58(3):234-245.
17 Green S A,Blough N V.Optical absorption and fluorescence properties of chromophoric dissolved organic matter in natural waters[J].Limnology and Oceanography,1994,39(8):1903-1916.
18 Hong H S,Wu J Y,Shang S L,et al.Absorption and fluorescence of chromophoric dissolved organic matter in the Pear l River Estuary,South China[J].Marine Chemistry,2005,97(1-2):78-89.
19 Helms J R,Stubbins A,Ritchie J D,et al.Absorption spectral slopes and slope ratios as indicators of molecular weight,source,and photo bleaching of chromophoric dissolved organic matter[J].Limnology and Oceanography,2008,53(3):955-969.
20 Stedmon C A,Markager S,Bro R.Tracing dissolved organic matter in aquatic environments using a new approach to fluorescence spectroscopy[J].Marine Chemistry,2003,82(3-4):239-254.
21郝玉,龙江平.北极楚科奇海海底表层沉积物有机碳的生物地球化学特征[J].海洋科学进展,2007,25(1):63-72.
22 Parlanti E,W9rz K,Geoffroy L,et al.Dissolved organic matter fluorescence spectroscopy as a tool to estimate biological activity in a coastal zone submitted to anthropogenic inputs[J].Organic Geochemistry,2000,31(12):1765-1781.
23 Stedmon C A,Markager S.Tracing the production and degradation of autochthonous fractions of dissolved organic matter by fluorescence analysis[J].Limnology and Oceanography,2005,50(5):1415-1426.
24 Stedmon C A,Markager S.Resolving the variability in dissolved organic matter fluorescence in a temperate estuary and its catchment using PARAFAC analysis[J].Limnology and Oceanography,2005,50(2):686-697.
25 Huguet A,Vacher L,Relexans S,et al.Properties of fluorescent dissolved organic matter in the Gironde Estuary[J].Organic Geochemistry,2009,40(6):706-719.
26 Zhang Y L,Zhang E L,Yin Y,et al.Characteristics and sources of chromophoric dissolved organic matter in lakes of the Yungui Plateau,China,differing in trophic state and altitude[J].Limnology and Oceanography,2010,55(6):2645-2659.
27 McK night D M,Boyer E W,Westerhoff P K,er al.Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity[J].Limnology and Oceanography,2001,46(1):38-48.
28 Cory R M,McK night D M.Fluorescence spectroscopy reveals ubiquitous presence of oxidized and reduced quinones in dissolved organic matter[J].Environmental Science&Technology,2005,39(21):8142-8149.