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首页> 外文会议>International conference on environmental biotechnology and materials engineering;EBME 2011 >Reconstructing lake history changes from zooplankton subfossil in the sediment of Wuliangsuhai Lake, China
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Reconstructing lake history changes from zooplankton subfossil in the sediment of Wuliangsuhai Lake, China

机译：乌梁素海湖泊沉积物中浮游生物亚化石的湖泊历史变化重建

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摘要

The sediment samples of zooplankton subfossil at different depths were collected from a large shallow lake Wuliangsuhai Lake, China, in order to reconstruct lake past changes. The lake began to switch to eutrophication gradually in the middle 1980s, creating a sediment discontinuity layer (about 32.5 cm depth) that can be visually used to separate sediments derived from plankton and macrophyte. Inferences about the timing and trajectory of eutrophication were made using sediment zooplankton subfossil reconstruction. The changes in composition of the zooplankton fragments were rather gradual up the core, whereas the total numbers of fragments show the most marked changes from 32.5 cm to present. Changes in the composition of zooplankton fragments (in 32.5 cm depth) show a gradual shift from a "pelagic community" dominated by B. longirostris, reflecting clearwater conditions with high predation pressure, to a more "benthic" community, dominated by plant associated Chydorids. The results suggest that it is possible to reconstruct past eutrophication trends of the lake by using zooplankton subfossil, and that anthropogenic pollutant loading is the key factor in the eutrophication of Lake Wuliangsuhai.
机译：从中国较大的浅水湖泊五粮苏海中采集了不同深度的浮游生物亚化石的沉积物样本，以重建湖泊过去的变化。在1980年代中期，该湖开始逐渐转向富营养化，形成了一个沉积物不连续层（约32.5厘米深），可以在视觉上用来分离浮游生物和大型植物的沉积物。利用沉积物浮游生物亚化石重建对富营养化的时间和轨迹进行了推断。浮游动物碎片组成的变化在核心区域是逐渐变化的，而碎片总数从32.5厘米到目前显示出最明显的变化。浮游动物碎片组成的变化（在32.5厘米深）显示出从长双歧杆菌（B. longirostris）为主的“浮游生物群落”（反映出高捕食压力的清水条件）逐渐向以植物相关的虎鲸为主的更“底栖”群落的转变。 。结果表明，利用浮游生物亚化石可以重建过去的湖泊富营养化趋势，而人为污染源是五粮苏海富营养化的关键因素。

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