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化石硅藻
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  fossil diatom
    According to these diatom-pH transfer functions,the fossil diatom in the sediment were analysed to reconstruct the pH value in Llyn Hir(lake) from 1956 to 1995.It showed that the improvement of pH in 1985 was the result of liming by the history record and there was an obvious effect in the following six years but the effect weakened gradually and vanished.
    我们在Llyn Hir湖中心钻取岩芯,对顶部14.5cm进行了化石硅藻种群组合的分析,利用这些资料,根据这3个硅藻-pH转换函数模型,定量重建了该湖1956~1995年pH的变化过程. 结果显示,1985年为了改善该湖酸化状况,向湖中施加石灰引起湖水pH明显增高,这种显著效果维持了6年,此后逐渐减弱乃至消失.
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  fossil diatom
Fossil diatom algae first found in the Paleogene marine succession (Alugivayam Formation) of the Il'pinskii Peninsula, northeastern Kamchatka are studied, and new data on molluscan assemblages from the same sequences are presented.
      
Fossil diatom assemblages preserved within the sedimentary record in Arctic lakes provide the potential to reconstruct past changes in important limnological variables.
      
Sediment records can be disturbed by erosional and redepositional events, which redeposit microfossils within a basin and may then lead to misinterpretations of fossil diatom assemblages.
      
Consequently, the fossil diatom data can be used to establish a continuous record of past climate variability over approximately the past 1300?years.
      
It has been thoroughly documented by the gradual change in the composition of the fossil diatom floras.
      
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In terms of principle components analysis,detrended correspondence analysis and canonical correspondence analysis,a diatom-pH transfer function could be reconstructed by using the modern diatom data and pH from 34 lakes in Wales.In light of root mean square error and residuals results of the experiments,x-validated weighted averaging with classical deshrinking and x-validated weighted averaging partial least squares component 2 were selected for pH reconstruction with WA with classical deshrinking as comparison.According...

In terms of principle components analysis,detrended correspondence analysis and canonical correspondence analysis,a diatom-pH transfer function could be reconstructed by using the modern diatom data and pH from 34 lakes in Wales.In light of root mean square error and residuals results of the experiments,x-validated weighted averaging with classical deshrinking and x-validated weighted averaging partial least squares component 2 were selected for pH reconstruction with WA with classical deshrinking as comparison.According to these diatom-pH transfer functions,the fossil diatom in the sediment were analysed to reconstruct the pH value in Llyn Hir(lake) from 1956 to 1995.It showed that the improvement of pH in 1985 was the result of liming by the history record and there was an obvious effect in the following six years but the effect weakened gradually and vanished.Although liming can increase pH in a relatively short period,it can not eradicate lake acidification.

PCA、DCA和CCA分析显示,可以利用英国威尔士地区34个湖泊表层沉积物的现代硅藻组合和pH数据,建立硅藻-pH转换函数.根据RMSE和残差分析,选用了WA-Cla-X和WAPLS-C2-X模型,同时选取WA-Cla作为对照.我们在Llyn Hir湖中心钻取岩芯,对顶部14.5cm进行了化石硅藻种群组合的分析,利用这些资料,根据这3个硅藻-pH转换函数模型,定量重建了该湖1956~1995年pH的变化过程.结果显示,1985年为了改善该湖酸化状况,向湖中施加石灰引起湖水pH明显增高,这种显著效果维持了6年,此后逐渐减弱乃至消失.利用硅藻-pH转换函数重建的湖泊pH变化结果与湖泊pH实际监测结果相当吻合,说明了虽然施加石灰可在较短时期内减弱湖泊酸化程度,但是不能根治湖泊酸化.

 
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