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AMS 14C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:总碳和有机碳与除硫和磷元素以外的各营养成分都呈良好的线性相关(R2>0.7,Ρ<0.05);碳、氮、磷的加积速率与沉积物的沉积速率呈极显著正相关关系(R2>0.95,Ρ<0.01),沉积物的沉积速率是碳、氮、磷的加积速率的主控因素;虽然现代黄河三角洲沉积物有机碳浓度较低(<1%),但由于沉积物的高沉积速率,现代黄河三角洲沉积物有机碳的平均加积速率达到648.1g/(m2·a),远高于世界其它高有机碳浓度的湿地,因此是很好的碳汇地质体。
Core ZK1 in a shallow depth of 24.6m was drilled in the Yellow River Delta in 2007, from which sediments were sampled for detailed sedimentological observations and analyses for water content, organic carbon(Corg), total carbon(TC), and nutrient compositions. Stratigraphic analysis recognized seven sedimentary environments, and the evolution of coastal wetland was revealed by chronological dating by AMS 14C. Sedimentation rate and carbon accumulation rate were calculated, and historic records of the Yellow River diversions was established. Results show that TC, Corg, and nutrients(except for element S) are in good linear correlations(R2>0.7, P<0.05); the accumulation rates of Corg, TC, N, and P have very significant positive correlations with sedimentation rates(R2>0.95, P<0.01). The sedimentation rates were the main factor controlling the accumulations of Corg, TC, N, and P. Although the Corg concentration is low(<1%) in modern Yellow River Delta sediments, the average accumulation rate of Corg in the core sediment is very high at 648.1g/(m2·a) due to high sedimentation rate, which is much higher than those in other high-Corg wetlands in the world. Thus, the modern Yellow River Delta is a large carbon sink due to its high sedimentation rates.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2014年第1期94-102,共9页
Oceanologia Et Limnologia Sinica
基金
国土资源部公益性行业科研专项基金
201111023号
海洋地质保障工程项目
GZH201200503号
国家自然科学基金项目
41240022号
科技部支撑项目
2012BAC07B01号
地质大调查项目
1212010611402号
国土资源部海洋油气资源与环境地质重点实验室基金
MRE200920号
关键词
黄河三角洲
滨海湿地
沉积环境
有机碳
加积速率
coastal wetland
sedimentary environment
organic carbon
accumulation rate
the Yellow River Delta
