| 摘要: |
| 2007年在黄河三角洲布设了一口24.6m的浅钻ZK1，对获取的岩芯样品进行了详细的沉积学观测及含水量、有机碳、总碳和营养成分的实验室分析测试。通过ZK1孔的地层分析，将其划分为7种沉积环境，揭示了滨海湿地地质演化过程。并利用AMSC14测年方法，结合黄河改道的历史记录，运用历史地理学和沉积地质学综合分析的方法对黄河三角洲沉积环境进行了年代划分，并计算了黄河三角洲不同沉积环境沉积物的沉积速率和碳的加积速率。结果表明：总碳和有机碳与除S元素以外的各营养成分都呈良好的线性相关（R2>0.7，p<0.05）；Corg和TC的加积速率与沉积物的沉积速率呈极显著正相关关系（R2=0.999，p<0.01）和（R2=0.992，p<0.01），沉积物的沉积速率是有机碳和总碳加积速率的主控因素；虽然现代黄河三角洲沉积物Corg浓度较低（<1%），但由于沉积物的高沉积速率，现代黄河三角洲沉积物Corg的平均加积速率达到648.1 g/（m2?a），远高于世界其它高Corg浓度的湿地，因此是很好的碳汇地质体。 |
| 关键词: 黄河三角洲 滨海湿地 沉积环境 有机碳 加积速率 |
| DOI：10.11693/hyhz20130116002 |
| 分类号: |
| 基金项目:国土资源部公益性行业科研专项基金（201111023）、地质大调查项目（1212010611402）、海洋地质保障工程项目（GZH201200503）及国土资源部海洋油气资源与环境地质重点实验室基金（MRE200920） |
附件 |
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| Accretion Rate of Carbon and Nutrients of Coastal Wetland Evolution in The Yellow River Delta |
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Ding Xigui,Ye Siyuan,Zhao Guangming,Yuan Hongming and Wang Jin
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Qingdao Institute of Marine Geology,Qingdao Institute of Marine Geology,Qingdao Institute of Marine Geology,Qingdao Institute of Marine Geology,Qingdao Institute of Marine Geology
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| Abstract: |
| Core ZK1 with a shallow depth of 24.6 m was drilled in the Yellow River Delta in 2007. Samples from the core were used in the laboratory to make detailed sedimentologic observations and do analyses of water content, organic carbon (Corg), total carbon (TC), and nutrient compositions. According to the stratigraphic analyses of core ZK1, seven sedimentary environments have been recognized，and the historic evolutions of coastal wetlands have been revealed. Chronologies, sedimentation rates and carbon accretion rates of the environments are made known from AMS14C dating method, historic records of the Yellow River diversions, and comprehensive analyses by means of historic geography and sedimentary geology. Results show that total carbons, organic carbons and nutrients (except element S) are all in good linear correlations (R2>0.7, p<0.05); accretion rates of Corg and TC have very significantly positive correlations with sedimentation rates showed as R2=0.999, p<0.01 and R2=0.992, p<0.01; and sedimentation rates are the main factor controlling accretion rates of Corg and TC. Although Corg concentrations are low (<1%) in the modern Yellow River Delta sediments, the high sedimentation rates make the average accretion rate of Corg in the sediments come up to 648.1 g/(m2?a), much higher than those in other high-Corg wetlands in the world, and thus the modern Yellow River Delta can be considered a very good carbon sink due to its high sedimentation rates. |
| Key words: coastal wetland sedimentary environment organic carbon accretion rate the Yellow River Delta |
