Differentiation of sedimentary environment and its carbon sequestration rate since the Late Pleistocene in the Luanhe River Delta, northern Bohai Bay
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摘要:研究目的
开展渤海湾北部滦河三角洲晚更新世以来不同沉积环境的划分,计算分析碳埋藏速率的大小和控制因素,进一步评价区域碳储能力。
研究方法本文对BXZK03孔岩芯开展晚更新世以来的古沉积环境恢复,并取样分析了包括粒度、年代(AMS14C和OSL)、含水量、有机碳、总碳和其他营养成分等在内的测试指标。
研究结果该孔晚更新世以来地层自下而上划分为泛滥平原、海滩沙脊、浅海、障壁沙坝(三角洲前缘)和潟湖的沉积环境单元,各沉积单元平均有机碳埋藏速率大小依次为:障壁沙坝51.47 g/(m2·a)>海滩沙脊32.59 g/(m2·a)>浅海7.82 g/(m2·a)>潟湖4.66 g/(m2·a)。总碳、有机碳与各营养元素具有显著(P < 0.01)线性相关关系,方差分析显示沉积速率和碳浓度分别是滦河三角洲碳埋藏速率的主要控制因素。
结论滦河三角洲沉积物中有机碳浓度相对较低,但是在全新世三角洲沉积速率较高,使得有机碳埋藏速率也相对较高,因此具有一定的碳储能力。
创新点:揭示了滦河三角洲晚更新世以来沉积环境演化特征,评估了不同沉积环境中碳埋藏速率。
Abstract:This paper is the result of marine and environmental geological survey engineering.
ObjectiveCarry out the differentiation of the sedimentary environments since the Late Pleistocene in the Luanhe River Delta, northern Bohai Bay, calculate and analyze the magnitude and controlling factors of the carbon sequestration rate (CSR), and further evaluate the regional carbon storage capacity.
MethodsIn this paper, the reconstruction of the paleo-sedimentary environment since the Late Pleistocene was carried out on the core of hole BXZK03, and the parameters including particle size, age (AMS14C and OSL), water content, organic carbon, total carbon and other nutrients contents were sampled and analyzed.
ResultsSince the Late Pleistocene, the strata were divided from bottom to top into five sedimentary environmental units, including flood plain, sand ridge, shallow sea, barrier sand bar (delta front), and lagoon. The CSRs were in the order of barrier sand bar 51.47 g/(m2 · a)> beach sand ridge 32.59 g / (m2 · a)> shallow sea 7.82 g/(m2 · a)> lagoon 4.66g / (m2 · a). Correlation analysis showed that there was a significant (P < 0.01) linear correlation between total carbon, organic carbon and each nutrient element. Variance analysis suggested that CSRs were likely controlled by the deposition rate and carbon concentration, respectively.
ConclusionsAlthough the organic carbon concentrations of sediments in Luanhe River Delta were relatively low, there were relatively high organic CSRs due to an elevated deposition rate during Holocene. Therefore the Holocene sediment has a remarkable carbon storage capacity.
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致谢: 感谢项目组成员赵广明、杨士雄、谢柳娟、丁喜桂、王锦、余雪洋以及中国地质大学(武汉)博士生裴理鑫,山东科技大学研究生雷雁翔和中国地质大学(北京)研究生周攀在野外取样、室内分样和论文写作过程中给予的帮助。
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图 1 滦河冲积扇—三角洲和BXZK03钻孔位置图(据薛春汀,2016)
1—山地、丘陵;2—贝壳堆积体;3—老冲积扇上的废弃河道;4—滦河冲积扇—三角洲边界;5—新、老滦河冲积扇—三角洲界限;6—全新世海侵边界;7—老滦河冲积扇—三角洲;8—新滦河冲积扇—三角洲
Figure 1. Location of Luanhe Fan-delta and core BXZK03 (modified from Xue Chunting, 2016)
1-Mountains and hills; 2-Shell accumulation; 3-Abandoned river channels on old alluvial fans; 4-Alluvial fan of Luanhe river-delta boundary; 5-Alluvial fan of the new and old Luanhe river-delta boundary; 6-Holocene transgression boundary; 7-Alluvial fan of the old Luanhe river-delta; 8-Alluvial fan of the new Luanhe river-delta
表 1 BXZK03孔AMS14C和OSL测年数据
Table 1 AMS14C and OSL data of core BXZK03
表 2 滦河三角洲BXZK03孔沉积物元素浓度
Table 2 Element concentration of the sediments in Core BXZK03 from the Luanhe River Delta
表 3 滦河三角洲不同沉积环境垂向沉积速率与TC和Corg的埋藏速率
Table 3 Vertical sediment rate and accretion rate of carbon of diferent sediment environments in Luanhe River Delta
表 4 沉积物TC、Corg以及其他营养成分浓度的相关系数
Table 4 Correlations between TC、Corg and nutrients in the sediments
表 5 沉积物TC、Corg埋藏速率的相关系数
Table 5 Correlations between TC, Corg accretion rate in the sediments
表 6 各因素对碳埋藏速率的方差的贡献(V代表方差,COV代表协方差)
Table 6 The contribution of each factor to the variance of C accretion rate (V represents the variance, and COV represents the covariance)
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