研究论文
吴丰昌,万国江,黄荣贵,蔡玉蓉.湖泊水体中硫酸盐增高的环境效应研究[J].环境科学学报,1998,18(1):28-33
湖泊水体中硫酸盐增高的环境效应研究
- ENVIRONMENTAL IMPACT OF SULFATE CONCENTRATION INCREASING OF LAKES
- 基金项目：国家自然科学基金,中科院院长基金
- 作者
- 单位
- 吴丰昌
- 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550002
- 万国江
- 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550002
- 黄荣贵
- 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550002
- 蔡玉蓉
- 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550002
- 摘要：通过对高原3个硫酸盐浓度差异的湖泊沉积物 水界面硫的形态分布、扩散通量和碎屑有机硫通量等估算,揭示了湖泊水体硫酸盐增加以后的环境效应和自然反馈机制。研究认为：水体向沉积物内部扩散和界面硫酸盐还原作用是高硫酸盐浓度水体硫酸盐的主要清除作用,随硫酸盐浓度的增加,它在水体清除硫酸盐作用的贡献逐渐增大,而低硫酸盐含量湖泊水体生物同化吸收作用是水体硫酸盐的主要清除机制,它在硫酸盐浓度不同的水体没有差异。
- Abstract：Three lakes(Lake Aha,Lake Erhai and Lake Baihua) from Yunnan Guizhou Plateau with obviously different sulfate concentration were chosen for this study.Through quantitatively evaluation of two main sulfate scavenging rate:scavenging rate of sulfate reduction,and phytoplankton assimilation rate,and their contribution to sulfate scavenging process,eco environmental impacts resulted from sulfate concentration increasing in aquatic environment were discussed.The results showed that downward diffusion from overlying waters to sediments and reduction near the interface are key sulfate scavenging mechanism in lakes where there is high sulfate concentration;biological assimilation process is dominant sulfate sca venging mechanism in such lakes at low sulfate concentration.The first mechanism can only scavenge 0.4—8.4% of the total sulfate in lakes.In addition,it can also produce (0.3—23.0)×10-2 mmol (cm-2 ·a-1 ) alkalinity flux which can contradict acidity of natural environment.The second scavenging mechanism can generally scavenge 3%—4% of total sulfate in lake and it is stable in lakes with various concentrations of sulfate.
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