Insights into pollen source area, transport and deposition from modern pollen accumulation rates in lake sediments
Insights into pollen source area, transport and deposition from modern pollen accumulation rates in lake sediments
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DOI：
10.1016/j.quascirev.2013.12.015
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发表时间：
2014-03
影响因子：
4
通讯作者：
Isabelle Matthias;T. Giesecke
中科院分区：
文献类型：
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作者：
Isabelle Matthias;T. Giesecke
晚第四纪沉积物的花粉积累率（PAR）可以提供过去植物丰度的直接估计。它们受湖泊内部过程的影响，因此很少用于站点之间的比较，尽管Fennoscandia的研究很少成功地应用它们。本研究的目的是探讨如何从东北部德国选定的湖泊PAR反映植物丰富度的差异，作为定量植被重建的一步PARs.Short沉积物芯收集了18个湖泊，其中16个可以通过210 Pb定年。对最年轻沉积物的PAR进行了估计，代表2009年采样前约两年，样品可追溯到1993年左右。森林清查数据的两个时间片获得了15公里的网站和立木蓄积量（SV）估计为地上生物量的措施。PAR进行了比较，总SV内增加的地区周围的湖泊，以及距离加权SV使用的普伦蒂斯/杉田模型的花粉传播和沉积。对植被数据的两次评估都与几十米至几公里距离的PAR产生了很强的线性关系，证明了当地植被的重要性。这表明，经常被忽视的树干空间成分的花粉运输的小湖泊的重要性。结果表明，这些网站收到了更大的绝对输入花粉从区域来源的少数大型湖泊。这些观察表明，小湖泊可能有点庇护以上的冠层transmitted花粉。我们证明，PAR的主要树木类群从湖泊沉积物中获得的湖泊周围的生物量是线性相关的。这证实，PAR可以用来推断过去的植物生物量的变化，虽然绝对花粉沉积也可以由净初级生产力的生物量。
Pollen accumulation rates (PAR) from late Quaternary deposits can provide direct estimates of past plant abundance. They are influenced by lake internal processes and therefore rarely used in between site comparisons, although few studies from Fennoscandia have applied them successfully. This study aims to explore how PARs from selected lakes from Northeast Germany reflect differences in plant abundance as a step towards quantitative vegetation reconstructions from PARs.Short sediment cores were collected from 18 lakes of which 16 could be dated by210Pb. PARs were estimated for the youngest sediment, representing approximately two years before sampling in 2009, and samples dated to around 1993. Forest inventory data for the two time slices were obtained for 15 km around the sites and standing volume (SV) was estimated as a measure of above ground biomass. PARs were compared to the total SV within increasing areas around the lakes, as well as to distance-weighted SV using the Prentice/Sugita model of pollen dispersal and deposition. Both assessments of the vegetation data yielded strong linear relationships with PARs already over distances of tens of metres to a few kilometres documenting the importance of the local vegetation. This indicates the importance of the often neglected trunk space component of pollen transport for small lakes. Results from the small number of large lakes suggest that these sites receive a larger absolute input of pollen from regional sources. These observations indicate that small lakes may be somewhat sheltered from pollen transported above the canopy.We demonstrate that PARs of the major tree taxa obtained from lake sediments are linear related to the lake surrounding biomass. This confirms that PAR can be used to infer past changes in plant biomass, although absolute pollen deposition may also be determined by net primary productivity of the biomass.