黄河济南段柱状沉积物中木质素的分布特征
发布时间：2019-03-27 08:41
【摘要】：河流是有机物从陆地向海输送的重要纽带。研究河流沉积环境中有机物的来源、贡献和分布情况,对于评估陆源有机物的碳循环以及反演环境演变具有重要意义。本文以黄河济南段的柱状沉积物为例,利用碱性CuO把木质素氧化分解为不同的单体并通过GC-FID测定,初步探讨了木质素的垂直分布特征和有机物来源。研究结果表明:木质素的含量Σ8(mg/10gds)的变化范围0.0029~0.60mg/10gds,其Σ8的值整体较低,少数值几乎接近检出限,可能与黄河含沙量大,砂质颗粒物的有机质本身含量较低有关,同时低Σ8很好地揭示了沉积物样品的贫有机质特征;木质素的植被参数S/V和C/V表明其母源植被多以被子植物的叶或草为主,部分区段掺杂着裸子植物草本组织。其降解参数(Ad/Al和P/(V+S))则揭示了木质素经历了中高程度的氧化降解和较强的去甲基/去甲氧基降解。此外,C/V和3,5-Bd/V(3,5-双羟基苯甲酸/V)的关系说明该研究区域有机物主要来自土壤的贡献。
[Abstract]:Rivers are an important link in the transport of organic matter from land to sea. The study on the source, contribution and distribution of organic matter in fluvial sedimentary environment is of great significance for assessing the carbon cycle of terrestrial organic matter and inversion of environmental evolution. Taking the columnar sediments of Jinan section of the Yellow River as an example, lignin was oxidized into different monomers by alkaline CuO and determined by GC-FID. The vertical distribution characteristics of lignin and the source of organic matter were discussed. The results show that the change range of lignin content 危 8 (mg/10gds) is 0.0029 ~ 0.60 mg / 10 GDP, its 危 8 value is lower as a whole, and a few values are almost close to the detection limit, which may be related to the high sediment content of the Yellow River. The content of organic matter in sandy particulate matter is relatively low, and the low 危 8 well reveals the characteristics of poor organic matter in sediment samples. The vegetation parameters S _ (V) and C _ (V) of lignin indicated that the parent vegetation was mainly composed of angiosperm leaf or grass, and some parts of lignin were mixed with gymnosperms herbaceous tissue. Its degradation parameters (Ad/Al and P / (V S) revealed that lignin experienced moderate and high degree of oxidative degradation and strong demethylation / demethoxy degradation. In addition, the relationship between C, V and 3,5-dihydroxybenzoic acid / V (3,5-dihydroxybenzoic acid / V) indicates that the organic matter in the study area is mainly from the contribution of soil.
【作者单位】： 中国海洋大学海洋化学理论与工程技术教育部重点实验室;
【基金】：国家自然科学基金项目(41276067) 国家重点基础科学研究发展计划(973计划)(2010CB428901)资助
【分类号】：P734
本文编号：2448040
[Abstract]:Rivers are an important link in the transport of organic matter from land to sea. The study on the source, contribution and distribution of organic matter in fluvial sedimentary environment is of great significance for assessing the carbon cycle of terrestrial organic matter and inversion of environmental evolution. Taking the columnar sediments of Jinan section of the Yellow River as an example, lignin was oxidized into different monomers by alkaline CuO and determined by GC-FID. The vertical distribution characteristics of lignin and the source of organic matter were discussed. The results show that the change range of lignin content 危 8 (mg/10gds) is 0.0029 ~ 0.60 mg / 10 GDP, its 危 8 value is lower as a whole, and a few values are almost close to the detection limit, which may be related to the high sediment content of the Yellow River. The content of organic matter in sandy particulate matter is relatively low, and the low 危 8 well reveals the characteristics of poor organic matter in sediment samples. The vegetation parameters S _ (V) and C _ (V) of lignin indicated that the parent vegetation was mainly composed of angiosperm leaf or grass, and some parts of lignin were mixed with gymnosperms herbaceous tissue. Its degradation parameters (Ad/Al and P / (V S) revealed that lignin experienced moderate and high degree of oxidative degradation and strong demethylation / demethoxy degradation. In addition, the relationship between C, V and 3,5-dihydroxybenzoic acid / V (3,5-dihydroxybenzoic acid / V) indicates that the organic matter in the study area is mainly from the contribution of soil.
【作者单位】： 中国海洋大学海洋化学理论与工程技术教育部重点实验室;
【基金】：国家自然科学基金项目(41276067) 国家重点基础科学研究发展计划(973计划)(2010CB428901)资助
【分类号】：P734
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