| 摘要: |
| 以阳宗海为例，通过湖泊短柱状沉积物的磁参数、Fe、Al和化石生物的分析研究以及自然酸性湖泊沉积参数的对比验证，结果显示：低频磁化率(Χlf)、非磁滞剩磁(ARM)的数值以及介形类、硅藻的属种与浓度变化灵敏地指示工业大气污染和酸沉降的起点、过程和环境变化趋势；Fe、A1的显著递减同步于较强酸沉降时段，是工业大气污染危害湖泊环境的标志。上述环境参数可作为识别湖泊酸化趋势的沉积学证据。酸性水体的元素地球化学作用及其对水生生物的影响——生物贫化和耐酸物种的扩张是湖泊沉积物重现酸沉降的历史和过程的理论依据。 |
| 关键词: 酸沉降, 沉积学证据, 阳宗海 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目，49871075、40172102、49972058号；中国科学院知识创新工程资助项目，KZCX1-10-01号 |
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| SEDIMENTOLOGICAL EVIDENCE OF LAKE ACID PRECIPITATION |
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ZHU Yu-Xin, HU Shou-Yun, WANG Yun-Fei, YIN Yu, PAN Hong-Xi, ZHOU Wan-Ping
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Nanjing Institute of Geography and Limnology，The Chinese Academy of Sciences
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| Abstract: |
| We analyzed magnetic parameter, content of Fe and A1, ostracod and diatom in sediment of Yangzonghai Lake (Kunming), and compared and verified with nature acid lake (Qinhai Lake, Tengchong Count) simultaneously. The result shows that changes in magnetic susceptibility (Χlf) and Anhysterisis Remanent Magenetization (ARM), species and concentration of ostracod and diatom sensitively indicate the start, process and environment evolution trend of industrial atmosphere pollution and acid precipitation. It is the mark of harming lake environment by industrial atmosphere pollution; the obvious decrease in the contents of Fe an d A1 synchronizes with strong acid precipitation periods. The environmental parameters mentioned above provide sedimentological evidence for the trend of lake acidification. The element geochemistry processes in the acid water column and their influence on the aquatic creature, decrease in creature and expansion of acid resistant species form a theoretical basis to re-construct the history of acid precipitation in lake sediment. |
| Key words: Acid precipitation, Sedimentary processes, Yangzonghai Lake |
