Pollen representivity of montane forest taxa in south‐west Uganda
Pollen representivity of montane forest taxa in south‐west Uganda
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乌干达西南部山地森林类群的花粉代表性
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
David Taylor
中科院分区：
文献类型：
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作者：
R. Marchant;David Taylor
本文的结果证明了乌干达西南部Mubwindi沼泽的两个数据集之间的关系。第一组数据来自对紧邻集水区的旱地山地森林的调查，第二组数据来自从沉积物表面样本中恢复的花粉谱。数值分析将所遇到的花粉类型根据其与样地植被中同一分类群的丰度相比的代表性水平分为5类：代表性不足、代表性不足、代表性不足、代表性不足、代表性不足、代表性不足和代表性不足。Mubwindi沼泽北部也产生了一个5米长的富有机质沉积物序列（MB6岩心），从那里已经获得了亚化石花粉和放射性碳数据。这提供了一个机会，将来自现代花粉-植被关系的校准因子应用于从同一地点获得的亚化石花粉数据。这些校正因子有效地降低了过于具有代表性的花粉类型的影响，并允许对以前在亚化石花粉数据中没有如此清晰可见的森林扰动阶段进行区分。
Results presented in this paper demonstrate the relationship between two data sets from Mubwindi Swamp, south-west Uganda. The first data set is from a survey of dryland montane forest within the immediate catchment and the second is in the form of pollen spectra recovered from surface samples of sediment. Numerical analysis grouped pollen types encountered into five categories, according to their level of representivity when compared with abundances of the same taxa in the sampled vegetation: under representative, moderately under representative, representative, moderately over representative, and over representative. The northern part of Mubwindi Swamp also yielded a 5-m-long sequence of organic-rich sediments (core MB6) from which sub-fossil pollen and radiocarbon data have been previously obtained. This provides an opportunity to apply calibration factors derived from modern pollen–vegetation relationships to sub-fossil pollen data that were obtained from the same site. These calibration factors effectively down-weighted the influence of over representative pollen types and permitted the discrimination of a phase of forest disturbance that had not previously been so clearly visible in sub- fossil pollen data.