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生物硅在东南极湖泊古初级生产力研究中的应用

【标题】生物硅在东南极湖泊古初级生产力研究中的应用

【Title】APPLICATION OF BIOGENIC SILICA ON RECONSTRUCTION OF PALAEOPRIMARY PRODUCTIVITY IN EAST ANTARCTICA LAKES

【作者】 姜珊; 刘晓东; 徐利强; 孙立广

【Author】 Jiang Shan ; Liu Xiaodong ; Sun Liguang

【期刊】极地研究

【Journal】

【期刊年份】2011

【卷】23

【期】

【关键词】 东南极; 莫愁湖; 大明湖; 沉积物; 生物硅; 初级生产力

【Keywords】 East Antarctica; Mochou Lake; Daming Lake; sediments; biogenic silica; primary productivity

【摘要】本文对南极中山站区的莫愁湖和大明湖沉积物中生物硅、有机质等环境指标进行了分析,并在对比研究的基础上,探讨了生物硅在重建东南极湖泊沉积生态环境记录研究中的应用。研究结果表明,大量保存较好的硅藻出现在东南极淡水湖泊沉积物中,生物硅含量在深度剖面上表现出显著波动,与有机质等生物地球化学指标具有一致的垂向变化趋势,表明它们具有共同的生态环境意义。当沉积物中生物硅、有机质等环境指标出现低值时,指示该时期湖藻生产量减少、湖泊初级生产力降低,反之则代表湖泊生产力相对较高的时期。上述研究结果证明,在湖泊生态系统相对简单,湖区周围主要为裸露基岩的东南极湖泊沉积物中,生物硅含量的变化能有效指示湖泊古初级生产力的大小,是研究东南极湖泊沉积生态环境记录的理想替代性指标。

【Abstract】Two sediment cores, collected from Mochou Lake and Daming Lake in the area of Antarctic Zhongshan Station, were analyzed for some biogeochemical parameters such as biogenic silica, organic matter etc. Based on the synthetically comparative researches, we focused on the potential application of biogenic silica on the reconstruction of ecoenvironmental changes recorded in the east Antarctica lake sediments. The results showed that a large number of diatoms were well preserved in the freshwater lake sediments in east Antarctic, and the concentrations of biogenic silica displayed notable fluctuations versus depth. The contents of organic matter etc had almost consistent vertical change patterns with biogentic silica, reflecting their common ecoenvironmental implications. The low levels of above biochemical proxies reflected the reduction of lake algal production, corresponding to the decreased lake primary productivity. Overall, for the fragile lake ecosystem and exposed bedrock around in East Antarctic, the contents of biogenic silica in the sediments can sensitively indicate the evolution of palaeolake primary productivity, and thus it is an ideal proxy for the reconstruction of past eco-environmental changes recorded in the east Antarctic lacustrine sediments.

【基金/项目】 南极半岛紫外辐射(UVR)变化的湖泊沉积记录及生态效应 ; 东南极拉斯曼丘陵冰缘湖泊沉积的生态环境记录 ; 全新世南极南海典型岛屿对全球变化的生态响应与对比 ; 南极生物粪土层中重金属污染记录及历史生态毒理学研究 ; 东南极拉斯曼丘陵冰缘湖泊沉积的生态环境记录

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