大河口水库表层沉积物有机质特征及来源解析

张晓晶; 卢俊平; 张圣微; 马太玲; 张自豪

文章摘要

张晓晶,卢俊平,张圣微,马太玲,张自豪.大河口水库表层沉积物有机质特征及来源解析[J].农业环境科学学报,2019,38(12):2835-2843.

大河口水库表层沉积物有机质特征及来源解析

Characteristics and sources of organic matter in surface sediments of Dahekou Reservoir,China

投稿时间：2019-05-13

DOI：10.11654/jaes.2019-0531

中文关键词: 大河口水库有机质碳同位素（δ¹³C）氮同位素（δ¹⁵N）来源

英文关键词: Dahekou Reservoir organic matter carbon isotope(δ¹³C) nitrogen isotope (δ¹⁵N) sources

基金项目:国家自然科学基金项目（51669023，51869021）；内蒙古自治区高等学校科学研究项目（NJZY17072）

作者	单位	E-mail
张晓晶	内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
卢俊平	内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018	ljpcau@163.com
张圣微	内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
马太玲	内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
张自豪	内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018

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中文摘要:

为深入分析水库生态系统的污染来源和水环境的营养状况，本文对大河口水库表层沉积物中总有机碳（TOC）、总氮（TN）含量的分布特征，碳同位素（δ¹³C）、氮同位素（δ¹⁵N）和C/N值的组成进行分析，探讨了沉积物中有机质的来源。结果表明：大河口水库表层沉积物以远源搬运的风成沉积物为主，TOC含量在1.38%~3.52%，平均值为2.34%；TN分布范围在0.06%~0.21%，平均值为0.11%；δ¹³C分布范围在-2.69%~-2.41%，平均值为-2.54%，δ¹⁵N范围在0.19%~0.54%，平均值为0.39%。通过端元混合模型对沉积物有机质来源进行定性和半定量分析表明，陆生C3植物、土壤有机质和淡水水生植物是大河口水库沉积物有机质的3种主要来源，其中陆生C3植物贡献最大，其次是土壤有机质，个别断面有淡水水生植物来源。研究表明，大河口水库整体的初级生产力不高，有机质来源组成差异较小，有机质来源大都为外源。

英文摘要:

To further analyze the pollution source of reservoir ecosystem and nutritional status of water environment, the total organic carbon (TOC)distribution characteristics, total nitrogen(TN), and composition of carbon isotope(δ¹³C), nitrogen isotope(δ¹⁵N)and C/N value were analyzed in this paper. In addition, the source of sediment organic matter was determined. The results showed that the surface sediments of Dahekou Reservoir were mainly aeolian sediments transported from distant sources. TOC ranged from 1.38% to 3.52%, with an average of 2.34%. TN ranged from 0.06% to 0.21%, with an average of 0.11%. The δ¹³C values ranged from -2.69% to -2.41%, and the average was -2.54%. The δ¹⁵N ranged from 0.19% to 0.54%, and the average was 0.39%. According to the qualitative and semi-quantitative analysis of the sources of sediment organic matter by end element hybrid model, the terrestrial C3 plants, soil organic matter, and freshwater aquatic plants were the main sources of organic matter in sediment of Dahekou Reservoir. Among them, the contribution of terrestrial C3 plants was the most, followed by soil organic matter, and only one section had the source of freshwater aquatic plants. The primary productivity of Dahekou Reservoir is not high, the source composition of organic matter has little difference, and the source of organic matter is mostly exogenous.

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