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1.
测定了珠江口及近海表层沉积物中总有机碳(TOC), 总氮(TN)及稳定碳同位素组成和几类主要有机化合物(水解氨基酸THAA、糖类TCHO、脂类lipid、酸不溶有机物AIOC), 并分析了沉积有机质及化合物的特征和来源。结果表明珠江口表层沉积有机质主要为陆源和水生混合来源, 而近海有机质主要为当地水生来源。大量的陆源高等植物(含有较多的木质素、纤维素等)输入珠江口, 使得珠江口个别站位沉积物中糖类物质含量大幅高于近海样品; 而珠江口与近海沉积物中水生来源有机质的含量相当。氨基酸和糖类占TOC的份额在浮游生物和悬浮颗粒物中分别为56%和48%, 在表层沉积物中为19%, 说明珠江口和近海的有机质从水柱到达沉积物-水界面的过程中经历了较充分的降解。珠江口样品中活性组分氨基酸和糖类占TOC的份额低于近海, 可能说明珠江口沉积有机质的降解程度高于近海。 相似文献
2.
河口沉积物作为承接陆海过程的重要载体, 是有机质赋存的主要形式之一。本文研究了珠江口沉积物总有机碳、总氮含量和沉积物可溶性有机物三维荧光特征, 以及其在口内区、混合区和口外区空间差异和影响因素, 并结合碳稳定同位素(δ13C)估算了珠江口各区域沉积物中不同来源有机质的贡献。结果显示: (1)沉积物总有机碳和总氮含量空间变化相似, 口内区和混合区域沉积有机质含量显著高于口外区; 主成分分析发现, 口内区沉积有机质含量主要受径流输入的影响, 口外区主要受Fe3+的影响; (2)MixSIAR稳定同位素混合模型结果显示, 口内区和混合区沉积有机质以陆源为主, 口外区则以海源为主; (3)珠江口沉积物新生有机质较多, 可快速被利用, 总体上不利于有机碳存储; 而陆源输入导致口内区和混合区沉积有机质腐殖化程度较高, 有机碳可存储性相对较高, 口外受海源有机质和铁氧化物—有机质复合体的影响, 有机碳可存储性相对较低。本研究可为深入认知河口区沉积有机质的生物地球化学过程及有机碳存储提供参考。 相似文献
3.
Variation of reactivity of particulate and sedimentary organic matter along the Zhujiang River Estuary 总被引：3，自引：0，他引：3
To investigate organic matter source and reactivity in the Zhujiang River (Pearl River)Estuary and its adjacent areas, particulate organic carbon (POC), particulate hydrolysable amino acids (PHAA), and Chl a during two cruises in July 1999 and July 2000 were measured. The highest POC and PHAA concentration was observed in the waters with maximum Chl a. The spectra distribution,relative content (dry weight in milligram per gram), PHAA-C% POC and other indicators such as the ratios of amino acids vs. amino sugars (AA/AS) and glucosamine vs. galactosamine (Glum/Gal) suggested that particulate amino acids in the water column and sediments in the Zhujiang River Estuary were mainly derived from biogenic processes rather than transported from terrestrial erosion. In inner estuary where high turbidity was often observable, organic matter was mainly contributed by re-suspension of bottom sediments with revealed zooplankton, microbial reworked characteristics, which suggest that these organic matters were relatively “old“. In the estuarine brackish region, organic matter in water column is mainly contributed by relatively fresh, easily degradable phytoplankton derived organic matter.During physical - biological processes within the eastuary, organic matter derived from phytoplankton was subjected to alteration by zooplankton grazing and bacterial reworking. 相似文献
4.
In the course of the expedition of the Pacific Oceanological Institute in August 2007, extensive hypoxia was found in the
near-bottom layer of the Amur Bay water mass. The hypoxia’s formation was immediately reflected in the values and distribution
of the carbonate parameters in the near-bottom waters of the bay. The maximum values of the carbon dioxide partial pressure,
the dissolved inorganic carbon, and the total alkalinity were associated with the areas of the minimum oxygen content. The
microbial destruction of the dead phytoplankton greatly increased the partial pressure of carbon dioxide, which was over 2000
μatm in the hypoxia centers at a depth of about 20 m. At the same time, the carbon dioxide partial pressure in the surface
waters of Amur Bay was considerably lower than that in the atmosphere. Hence, the bay’s aquatic area was a sink for the atmospheric
CO2 despite its high content in the near-bottom waters. It was shown that the excess alkalinity associated with the hypoxia sites
in the near-bottom layer of water was caused by the sulfate reduction proceeding in the upper layer of the sediment. 相似文献
5.
Ling Zhang Kedong Yin Lu Wang Fanrong Chen Derong Zhang Yongqiang Yang 《Estuarine, Coastal and Shelf Science》2009,85(2):190-196
In this study, the contents, sources and accumulation rate of sedimentary organic matter (OM) in the Pearl River Estuary (PRE) and adjacent coastal area were investigated. The stable carbon isotopic composition (δ13C) is a reliable geochemical proxy and was used to indicate the OM origin here. Nevertheless, the organic carbon and nitrogen molar ratios (TOC/TN) and the stable nitrogen isotopic composition (δ15N) were affected by diagenesis and could be the supplementary indicators. The sources of OM were estimated based on the two end-member model. The results showed that in the estuary, sedimentary OM originated from terrestrial and aquatic mixing origins, whereas, OM in coastal sediments was dominantly algae-derived. The accumulation rate of sedimentary OM was analyzed based on 210Pb dating. Due to the sampling sites and the distinct hydraulic environments, the accumulation rates of TOC, aquatic and terrestrial OC were obviously higher in the estuary than in coastal area. TOC accumulation rates were 18–27 mg cm−2 y−1 in the estuary, and 0.84–3.6 mg cm−2 y−1 in coastal area. Aquatic OC accumulation rates were 7.9–11.3, 0.8–1.3, and 2.6–3.1 mg cm−2 y−1, and terrestrial OC accumulation rates were 9.7–16.3, 0.02–0.14, 0.16–0.42 mg cm−2 y−1 in cores 2, 5, 6, respectively. It could be seen from the high accumulation rate of organic matter in the estuary that, when nutrients increased in the river, phytoplankton biomass and productivity would also have increased. As a result, phytoplankton sinking and organic matter sedimentation usually increased with primary productivity, resulting in the observed accumulation rate of aquatic OC in the estuary. Furthermore, terrestrial OC accumulation rates in the estuary and coastal area showed an increasing trend with the age. 相似文献
6.
Composition of the organic matter of the water,suspended matter,and bottom sediments in Nha Trang Bay in Vietnam in the South China Sea 总被引：1，自引：0，他引：1
V. I. Peresypkin A. V. Smurov N. A. Shulga E. S. Safonova T. G. Smurova Ch. V. Bang 《Oceanology》2011,51(6):959-968
Research has been conducted in Nha Trang Bay (Southern Vietnam, the South China Sea) at the section from the estuary of the
Cai River to the marine part of the bay, as well as in the area of coral reefs. The objects of the studies are the river and
sea waters, the suspended matter, and the bottom sediments. Data on the dissolved organic carbon and the total nitrogen in
the water are obtained. The organic carbon content is estimated in the suspended matter; the organic carbon and the molecular
and group composition of the n-alkanes are determined in the bottom sediments. The molecular and group composition of the n-alkanes in the bottom sediments of the landfill have made it possible to identify three types of organic matter (OM): marine,
mixed, and of mainly terrigenous origin. All the types of OM are closely related to the specificity of the sedimentation and
the hydrodynamics of the waters in this water area. 相似文献
7.
C. Svensen D. Vili
i&#x; P. Wassmann E. Arashkevich T. Ratkova 《Estuarine, Coastal and Shelf Science》2007,71(3-4):381-390
The aim of this study was to investigate phytoplankton abundance, composition and vertical export in the highly stratified Krka estuary, Croatia. The estuary is stratified throughout the year, and an interface between fresh- and brackish water plays an important role in production and degradation of biogenic matter. Vertical export of particulate organic carbon (POC), phytoplankton carbon (PPC) and faecal pellet carbon (FPC) was studied by deploying sediment traps in the middle and lower reach of the estuary and in the adjacent coastal zone. Zooplankton faecal pellet (FP) production experiments were conducted to provide additional information on the potential contribution of FP to the total carbon flux. High suspended concentrations of POC, chlorophyll a and phytoplankton was found in the lower reaches of the Krka estuary, adjacent to a source of anthropogenic eutrophication. The fraction of organic detritus to the total POC flux was 61–69% inside the estuary but only 7% at the marine station. This indicates that the primary producers in the surface layer of the Krka estuary are decomposed in and below the interface and then settle as detritus to the bottom. Low sedimentation rates in the coastal zone outside the estuary revealed that the eutrophication does not spread out of the estuary. Mesozooplankton played a modest role in vertical flux regulation, due to their low abundance and dominance of smaller forms as well as low faecal pellet production rates. It is concluded that processes taking place at the freshwater-seawater interface are of major importance for the vertical carbon flux in the investigated area. 相似文献
8.
Distribution of organic carbon in sediments and its influences on adjacent sea area in the turbidity maximum of Changjiang Estuary in China 总被引：2，自引：0，他引：2
Distributions and sources of total organic carbon （TOC）in seabed sediments and their implications for hydrodynamics are analyzed, in the turbidity maximum of the Changjiang Estuary. Ecology ecoenvironmental effects of estuary water on the continuously increasing terrigenous organic carbon from the Changjiang River are also explored through variations of organic carbon content and water quality indicators. Results show that, hydrodynamics exert important influences on distributions of organic carbon in the tur- bidity maximum of Changjiang Estuary. For their redistribution effect of terrigenous organic carbon within the moving layer in the whole region, variations from land to sea are not indicated by surficial and vertical average values of TOC and total nitrogen （TN） contents in core sediment, as well as organic stable carbon isotopes in surface sediments. However, on the long-time scale, the trend of terrigenous organic carbon decreasing from land to sea is still displayed by variations of stable carbon isotopic average values becoming heavier from land to sea. Previous studies have shown that high content of Chl a cannot appear in the Changjiang Estuary in despite of adequate nourishment supply, because photosynthesis of phytoplankton is constrained by high suspended sediment concentration（SSC）. However, an area with a high content of Chl a occurs, which may be caused by resuspended benthic algae with bottom fine grain-size sediments. Tremendous pressures are imposed on the environment of Changjiang Estuary, because of uhrophication trends and special hydrodynamics. Phytoplankton bloom area tends to extend from the outer sea to the mouth of Changjiang River. 相似文献
9.
根据2013—2016年春季(5月)长江口及其邻近海域4个航次环境综合调查数据,探讨春季长江口水体颗粒有机碳(POC)时空分布特征及其环境影响因素。结果显示:2013—2016年春季长江口POC浓度范围为0.22~16.99 mg/L,均值为1.80 mg/L,总水域POC年际间变化显著,底层浓度高于表层。从口门区、近岸区和近海区三个子水域来看,除近岸底层POC浓度处于高值,年际差异不显著之外,其余水域的表、底层均存在空间变异和年际差异。POC浓度在口门附近偏南部水域达到高值,后沿长江冲淡水(CDW)方向降低,低值区位于近海底层,但表层POC在近海水域123°E附近出现次高值。POC浓度与盐度之间具有显著负相关关系,且相关性逐年递减;POC浓度与总悬浮物浓度(TSM)呈显著正相关,底层相关性高于表层;近海区表层POC与叶绿素a正相关关系极显著,二者高值区均分布在123°E附近。入海径流量与长江口春季POC浓度呈现出截然相反的年际变化趋势,径流对有机碳的稀释作用高于其输入作用。长江口春季POC主要以碎屑源为主,其分布与有机碳源、海水的稀释作用、悬浮物运动等多种因素有关,高浊水体中悬浮物影响显著,陆源有机碳对POC的影响在长江口近海水域有所弱化,而浮游植物对POC的贡献凸显。 相似文献
10.
11.
长江口盐度梯度下不同形态碳的分布、来源与混合行为 总被引：1，自引：0，他引：1
河口碳的生物地球化学过程是全球碳循环的重要组成。通过测定溶解无机碳（DIC）及其稳定同位素丰度（δ13CDIC）,溶解有机碳（DOC）,有色溶解有机物（CDOM）,颗粒有机碳（POC）及其稳定同位素丰度（δ13CPOC）与元素比值（N/C）及相关指标,研究了2014年7月长江口盐度梯度下不同形态碳的分布、来源和混合行为。结果表明,DIC浓度、DOC浓度、POC含量分别为1 583.2~1 739.6 μmol/L,128.4~369.4 μmol/L和51.2~530.8 μmol/L,这些不同形态碳及CDOM的荧光组分的分布模式相似,均是从口内到口外,整体呈现先增大后减小的趋势,并与盐度呈现非保守混合行为。添加作用主要发生在在口门处最大浑浊带附近。与含量相反,从口内到口外,δ13CDIC和δ13CPOC均呈现逐渐减小再增大的趋势,在口门附近达到最低值,分别为-9.7‰和-26.7‰。在口门附近不同形态碳含量上升及δ13CDIC、δ13CPOC的降低可能主要与沉积物再悬浮及微生物作用有关。基于蒙特卡洛模拟的三端元混合模型的结果显示,河口内外POC来源变化明显,口内POC以陆源有机碳贡献为主,平均为62.3%,口外海源贡献逐渐增加。CDOM相关参数结果表明长江口CDOM主要来自陆源输入,海源及人类活动等也对其产生影响。 相似文献
12.
长江口溶解有机物光漂白和光矿化表观量子产率 总被引：3，自引：1，他引：2
溶解有机物(DOM)经太阳光照射导致其吸光度(光漂白)和溶解有机碳(光矿化)损失,从而影响水体生态系统光学特性及碳循环。本文通过测定冬季长江口及其邻近海域DOM光降解表观量子产率(AQY),初步探讨了DOM光反应活性在河口及陆架海的变化特征。DOM光降解AQY由口内至口外逐渐递减,且有色溶解有机物(CDOM)光漂白速率是溶解有机碳(DOC)光矿化速率的10倍。Φble(CDOM光漂白表观量子产率)和Φmin(DOC光矿化平均量子产率)在最大浑浊带以东海域与盐度和SUVA254分别呈显著的线性负相关与正相关,表明DOM光反应活性在长江口外受物理混合影响为主,且陆源DOM光反应活性比海源高。此外,最大浑浊带下游DOM光降解AQY显著低于上游。DOM光降解速率随波长的变化呈现非高斯分布,且峰值出现在330 nm,积分结果表明UVA是DOM光降解的主要贡献者。本研究结果将为完善我国东海碳通量模型提供帮助。 相似文献
13.
F. Edelkraut 《Estuarine, Coastal and Shelf Science》1996,43(6):737-745
Lignin is produced only by vascular plants and therefore can be used as a tracer for terrestrial organic carbon input to the estuarine and marine environments. Lignin measurements have been done by analyses of the oxidation products such as vanillin or 4-hydroxybenzaldehyde.In the Elbe Estuary, free dissolved vanillin was analysed in order to test whether such measurements yield information on terrestrial carbon inputs into the Estuary and on the vanillin derived from lignin oxidation. In the period 1990–1992, concentrations of dissolved vanillin in the Elbe ranged from 0 to 60 μg l−1(mean: 8 μg l−1). Higher values were found in areas of increased microbial activity such as the turbidity zone and the river mouth where the water chemistry is influenced by large tidal flats. No correlation was found between dissolved vanillin and suspended matter concentrations, although lignin is normally associated with suspended particulate matter, nor was a covariance seen between dissolved vanillin and the terrestrial carbon inputs into the Estuary. Apparently, biological conversion of lignin was faster than the transport processes, and local sources were more dominant for the vanillin concentration than riverine sources. The dissolved vanillin turnover was fast and, consequently, a significant amount of lignin may be converted within an estuary. In sediments from the Estuary, the concentrations of dissolved vanillin were similar to those found in the water phase and showed no clear vertical profile. The sediment is unlikely to be the source for vanillin. 相似文献
14.
《Marine Chemistry》2001,73(3-4):253-271
The influence of mangrove-fringed tropical estuaries on coastal carbon budgets has been widely recognised. However, a quantitative differentiation between riverine and mangrove-derived inputs to the dissolved (DOM) and microparticulate organic matter (POM) pool of these environments has been hitherto not possible. Based on lignin-derived phenols and stable carbon isotopes a chemical signature for mangrove, terrestrial and marine-derived organic matter was established for a mangrove estuary in North Brazil. A mixing model was applied to calculate the contribution of each of the three sources to the DOM and POM pool in the estuary throughout 18 tidal cycles in the course of one year. Best source assignment for POM was reached with the yield of lignin phenols and δ13C as paired indicators, while the origin of DOM was best identified by the yield of lignin phenols and the acid to aldehyde ratio of vanillyl phenols. Although only about 6% of the fluvial catchment area is covered by mangroves, their contribution to the estuarine DOM and POM pool generally exceeded several times the terrigenic input from the hinterland. This outwelling of mangrove-derived organic matter was enhanced during the rainy season. DOM and POM were exported from the mangrove to the estuary in similar proportions. Most mangrove-POM was rapidly removed from the water column, while mangrove-DOM behaved conservatively. In contrast, terrestrial DOM was almost entirely removed in the outer part of the estuary, which was accompanied by a concomitant increase in terrestrial POM. This seems to be the result of a geochemical barrier zone for this type of DOM in the estuary. Generally, a high proportion of mangrove-DOM was present in the outer part of the estuary, even at high tide. This indicates DOM outwelling from mangroves in adjacent bays or estuaries and points to similar driving forces controlling this process on a regional scale. Mangroves probably play a more important role than rivers for marine carbon budgets along the North Brazilian coast south of the Amazon estuary. 相似文献
15.
The temporal and spatial distribution of total and organic particulate matter is investigated in the Bideford River estuary. Particulate matter is homogenously distributed in both the water column and the surface sediment, due to high rates of resuspension and lateral transport. The measured mean sedimentation rate for the estuary is 183·5 g of particulate matter m?2 day?1, of which more than half is due to resuspension.The surface sediment of the estuary is quantitatively the dominant reservoir of organic matter, with an average of 902·5 g of particulate organic carbon (POC) m?2 and 119·5 g of particulate organic nitrogen (PON) m?2. Per unit surface area, the sediment contains 450 times more POC and 400 times more PON than the water column. Terrestrial erosion contributes high levels of particulate matter, both organic and inorganic, to the estuary from the surrounding watershed. Low rates of sediment export from the estuary result in the accumulation of the terrigenous material. The allochthonous input of terrigenous organic matter masks any relationship between the indigenous plant biomass and the organic matter.In the water column, a direct correlation exists between the organic matter, i.e. POC and PON, concentration and the phytoplankton biomass as measured by the plant pigments. Resuspension is responsible for the residual organic matter in the water column unaccounted for by the phytoplankton biomass.The particulate content of the water column and the surface sediment of the estuary is compared to that of the adjacent bay. Water-borne particulate matter is exported from the estuary to the bay, so that no significant differences in concentration are noted. The estuarine sediment, however, is five to six times richer in organic and silt-clay content than the bay sediment. Since sediment flux out of the estuary is restricted, the allochthonous contribution of terrigenous particulate matter to the bay sediment is minor, and the organic content of the bay sediment is directly correlated to the autochthonous plant biomass. 相似文献
16.
长江口及其邻近海域表层沉积物中重金属分布和潜在生态危害评价 总被引：11，自引：0，他引：11
对长江口及其邻近海域表层沉积物中重金属Cu、Mn、Pb、Zn、Cr、Fe、Hg、Cd的含量分布以及富集状况进行分析,并采用Hakanson潜在生态危害指数法评价该海域中Cu、Pb、Zn、Cr、Hg、Cd污染的程度及其潜在的生态危害,结果表明:长江口及其邻近海域表层沉积物中Cu、Mn、Pb、Zn、Cr、Fe的分布特征表现为由近岸向远岸递减的趋势,整体上象山县和舟山群岛近岸海域的含量高于研究区北部含量;Hg在长江口南端含量较高,呈由西向东递减的趋势;Cd在长江口南端以及象山县东含量较高,在研究区中部含量较低。潜在生态危害评价结果表明,长江口及其邻近海域表层沉积物只有部分站点处于生态危害的中等级别,大多站点生态危害轻微,污染程度顺序为Cd>Hg>Cu>Pb>Cr>Zn;对长江口及其邻近海域生态环境具有潜在影响的重金属元素首先是Cd,其次是Hg。对底质环境质量进行系统聚类分析结果显示,象山县和长江口外以及济州岛西南近海海域的底质环境较差,应予以重视。 相似文献
17.
Distributions and sources of bulk organic matter and aliphatic hydrocarbons in surface sediments of the Bohai Sea, China 总被引：11，自引：0，他引：11
Surface sediment samples from a matrix of fifty-five sites covering virtually the entire Bohai Sea (Bohai), China were analyzed for total organic carbon (TOC), total nitrogen (TN), n-alkanes, unresolved complex mixture (UCM), biomarkers and stable carbon isotopic composition (δ13C), and principal component analysis was performed for source identification of organic matter (OM). The distribution of organic carbon correlated well with sediment grain size with the finest sediments having the highest concentration, suggesting the influence of hydrodynamics on the accumulation of sedimentary organic matter (SOM). The corrected TOC/ON (organic nitrogen) ratios and δ13C indicated mixed marine and terrestrial sources of SOM. Results suggested that δ13C could be used as a potential indicator to observe the dispersion of Huanghe-derived sediments in Bohai. Total n-alkane concentrations varied over 10-fold from 0.39 to 4.94 μg g− 1 (dry weight) with the maximum terrigenous/aquatic alkane ratio observed at the Huanghe River Estuary (HRE) due to more higher plant OM from riverine inputs. C12–C22 n-alkanes with even-to-odd predominance were observed in several central-eastern Bohai sites. The HRE and its adjacent area is the main sink for the Huanghe river-derived OC. The ubiquitous presence of UCM, biomarkers (hopanes and steranes) and PCA results indicated the presence of petroleum contamination in Bohai, mainly from offshore oil exploration, discharge of pollutants from rivers, shipping activities and atmospheric deposition. 相似文献
18.
Carbon inputs and distribution in estuaries of turbid rivers: the Yang Tze and Yellow rivers (China) 总被引：8，自引：0，他引：8
Particulate and dissolved organic and inorganic carbon concentrations were measured in the Yang Tze (Changjiang) and Huanghe (Yellow) river estuaries, during two different seasons. During the winter, the organic matter in the suspended load of both estuarine systems was dominantly of terrestrial origin, while in the summer, there were significant contributions from aquatic production. In these turbid rivers, there is a strong positive correlation between the concentrations of total suspended matter and particulate organic carbon, probably because biological production is inhibited when turbidity exceeds a certain limit. Dissolved organic carbon (DOC) does not exhibit a conservative behavior in these estuarine systems. High dissolved organic carbon values in bottom water samples suggest remobilization of DOC from near-surface, bottom sediments. Dissolved inorganic carbon concentrations were very high in the Huanghe River, and the trend in the calculated saturation indices for calcite suggests precipitation of carbonate in this estuarine system. There is no such evidence for carbonate precipitation in the Yang Tze River. 相似文献
19.
J.C. Therriault R. de Ladurantaye R.G. Ingram 《Estuarine, Coastal and Shelf Science》1984,18(1):51-64
Recent studies have indicated the existence of a considerably higher planktonic biomass in the deep waters of the Saguenay Fjord as compared to corresponding depths in the adjacent St Lawrence Estuary on the other side of a shallow sill. The hypothesis that has been put forward to explain this phenomenon is related to the advection of near surface estuarine waters, at times very rich in particulate matter, over the entrance sill into the deeper waters of the fjord. Mixing processes associated with the development of a density flow, the presence of a hydraulic jump or other mechanisms are assumed to be responsible for the common occurrence of lower density subsurface water within the basin as compared to that penetrating over the sill.The exchange processes between the estuary and the fjord are described and an estimate made of the estuarine water volume that penetrates into the lower layer of the fjord over a semidiurnal tide cycle. From these calculations, the replacement time for the outer basin was estimated to range between one and four days. The biological characteristics of this water were used to establish a budget for particulate matter exchange which showed, in early August, a typical net input of ? 188 t of particulate organic carbon into the deep waters of the fjord over one tide cycle. 相似文献
20.
鸭绿江河口西岸潮滩沉积物有机质对流域变化的响应 总被引：1，自引：1，他引：0
河流颗粒有机质提供了陆地碳循环的重要信息以及人类活动的记录,通过河口地区沉积物有机质组成,可反映流域变化及海陆间相互作用。2010-2011年分两次于鸭绿江河口西岸潮滩采集柱样4根及表层样23个。对样品进行有机质碳氮总量(TOC、TN)、碳氮同位素(δ13C、δ15 N)及沉积物粒度测试。分析结果表明,由河口向西,有机质受改造程度加深且来源逐渐复杂化,致TOC/TN与δ13C的相关性逐渐降低,δ15 N与沉积物粒度的相关性也随之降低。文中以δ13C为主线探讨沉积物有机质的来源及运移,TOC/TN作为辅助,δ15 N则用于指示生化条件的改变。柱样的δ13 C分布与河流入海输沙密切相关,水库对入海泥沙的拦截,致河口潮滩沉积速率减缓,从而增加了沉积物中海源有机质的含量,δ13C随之增加。潮滩西侧柱样的δ15 N增加指示了生活工业污水的大量排放。此外,表层样δ13C分布的方向性,指示了西水道门口处的快速堆积及潮下带物质的向岸运移,并在西岸潮滩向岸一侧富集。 相似文献