正构烷烃及单体碳同位素记录的石臼湖生态环境演变研究
Eco-environmental Evolution Inferred from n-Alkanes and δ ~(13)C Records in the Sediments of Shijiu Lake
查看参考文献40篇
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文摘
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利用正构烷烃及其碳同位素的分布特征重建古气候环境是目前全球变化研究的热点问题.对采集于石臼湖的沉积物样品进行~(210)Pb定年.采用正构烷烃及单体碳同位素的分布特征示踪沉积物中有机质的来源,探讨湖区近现代生态环境演变与人类活动的关系.结果表明,正构烷烃碳分子组合特征以C_(29)为主峰碳,C_(25)、C_(27)和C_31为次主峰,具有显著的奇偶优势,据此推断沉积物中有机质主要来源于大型水生植物及陆生高等植物.对C_(27)、C_(29)和C_31长链正构烷烃进行单体碳同位素测定,利用二元模式估算出湖区植被类型以C_3植物为主.正构烷烃及单体碳同位素的分布特征揭示了不同时期人类活动对湖区生态环境的影响:1862~1970年,总有机碳(TOC)、总氮(TN)及中低奇数碳正构烷烃(C_(17)~C_(25))相对含量较低,长链正构烷烃单体碳同位素(δ~(13)C_(25)~31)值偏轻,说明人类活动对湖区环境影响较小,生态环境相对稳定;1970~1983年, TOC、TN及C_(17)~C_(25)相对含量显著增加,δ~(13)C_(25)~31值明显偏重,指示此时期内围湖造田、化肥农药滥用及废水排放等人类活动造成湖区陆生高等植物退化,水体中藻类暴发,湖泊富营养化程度显著提高,生态环境急剧恶化;1983~2010年, TOC、TN及C_(17)~C_(25)相对含量仍处于高值范畴,湖泊富营养化问题没有得到有效控制,湖区生态环境整体呈现相对退化趋势. |
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其他语种文摘
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The study of global changes has focused on the reconstruction of paleovegetation and paleoclimate by n-alkanes and δ~(13)C. ~(210)Pb contents were measured for dating. The distribution characteristics of n-alkanes and δ~(13)C were used to indicate the source of the organic matter in the sediments of Shijiu Lake. The relationship between modern eco-environmental evolution and human behaviors was discussed in this paper. The combination characteristics of n-alkanes showed a significant odd-even predominance in high-carbon number and main peak at C_(29), suggesting that the organic matter in the sediments were mainly derived from macrophytes and terrestrial higher plants. The δ~(13)C contents of C_(27), C_(29) and C_31 n-alkanes were analyzed. Results indicated that C_3 plants are the dominant species. The distribution characteristics of n-alkanes and δ~(13)C in different periods revealed the impact of human behaviors on Shijiu Lake. From 1862 to 1970, the low relative content of TOC, TN, C_(17)-C_(25) and the light δ~(13)C_(25)-31 values showed that there were less human behaviors effects on Shijiu Lake and the eco-environment around the lake was stable. From 1970 to 1983, the relative content of TOC, TN and C_(17)-C_(25) increased significantly, the δ~(13)C_(25)-31values became weight. In this period, large areas of Shijiu Lake turned into farmland; pollution by fertilizers and pesticides was serious; large amounts of industrial and domestic wastewater were discharged into the lake. All these human behaviors resulted in the degradation of terrestrial higher plants around the lake. Meanwhile, the eutrophication levels were significantly increased. From 1983 to 2010, the relative contents of TOC, TN and C_(17)-C_(25) were still in high-value ranges, the problem of eutrophication was not effectively controlled and the eco-environment of Shijiu Lake was relatively degradated. |
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来源
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环境科学
,2013,34(2):484-493 【核心库】
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关键词
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湖泊沉积物
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正构烷烃
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碳同位素
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生态环境
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石臼湖
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地址
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1.
南京师范大学地理科学学院, 江苏省环境演变与生态建设重点实验室;;有机地球化学国家重点实验室, 南京, 210046
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南京师范大学地理科学学院, 江苏省环境演变与生态建设重点实验室, 南京, 210046
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0250-3301 |
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学科
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环境科学基础理论 |
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基金
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江苏高校优势学科建设工程
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江苏省博士后科研资助计划项目
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中国科学院广州地球化学研究所有机地球化学国家重点实验室基金
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国家自然科学基金项目
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国家自然科学基金重点项目
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中国博士后科学基金
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文献收藏号
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CSCD:4753862
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