Pollen-vegetation richness and diversity relationships in the tropics
Pollen-vegetation richness and diversity relationships in the tropics
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DOI：
10.1007/s00334-017-0642-y
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发表时间：
2017-10
影响因子：
2.5
通讯作者：
W. Gosling;Adele C. M. Julier;S. Adu‐Bredu;G. Djagbletey;W. Fraser;P. Jardine;B. Lomax;Y. Malhi;E. A. Manu;F. Mayle;S. Moore
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文献类型：
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作者：
W. Gosling;Adele C. M. Julier;S. Adu‐Bredu;G. Djagbletey;W. Fraser;P. Jardine;B. Lomax;Y. Malhi;E. A. Manu;F. Mayle;S. Moore
追踪生物多样性随时间的变化需要了解现代多样性之间的关系以及这种多样性如何在化石记录中保存。化石花粉是重建过去植被多样性的一种方式。然而，对生物多样性热带生态系统的现代花粉与植被多样性关系的了解有限。此处，将花粉（孢粉学）丰富度和多样性 (HillN1) 与新世界和旧世界热带地区（新热带区和古热带区）森林和草原生态系统的植被丰富度和多样性进行了比较。现代花粉数据是从部署在 1 公顷植被研究地块中的人工花粉捕捉器获得的，玻利维亚和加纳已在这些研究地块中完成了植被清查。从每个小区的 15 至 22 个诱捕器中获得花粉计数，每个小区的花粉总数> 2,500。新热带地区的孢粉丰富度/多样性值为湿润常绿森林 = 86/6.8，半落叶干燥森林 = 111/21.9，树木繁茂的稀树草原 = 138/31.5，古热带地区湿润常绿森林 = 144/28.3，半落叶湿润森林 = 104/4.4，森林-草原过渡 = 121/14.1；相应的植被丰富度/多样性为100/36.7、80/38.7和71/39.4（新热带），以及101/54.8、87/45.5和71/34.5（古热带）。由于景观多样性、授粉策略和花粉源区等其他因素的差异影响，孢粉丰富度/多样性与样地植被丰富度/多样性之间没有发现一致的关系。孢粉丰富度超过植被丰富度，而花粉多样性低于植被多样性。人们发现花粉雨反映了热带植被相对较高的全球多样性。
Tracking changes in biodiversity through time requires an understanding of the relationship between modern diversity and how this diversity is preserved in the fossil record. Fossil pollen is one way in which past vegetation diversity can be reconstructed. However, there is limited understanding of modern pollen-vegetation diversity relationships from biodiverse tropical ecosystems. Here, pollen (palynological) richness and diversity (HillN1) are compared with vegetation richness and diversity from forest and savannah ecosystems in the New World and Old World tropics (Neotropics and Palaeotropics). Modern pollen data were obtained from artificial pollen traps deployed in 1-ha vegetation study plots from which vegetation inventories had been completed in Bolivia and Ghana. Pollen counts were obtained from 15 to 22 traps per plot, and aggregated pollen sums for each plot were > 2,500. The palynological richness/diversity values from the Neotropics were moist evergreen forest = 86/6.8, semi-deciduous dry forest = 111/21.9, wooded savannah = 138/31.5, and from the Palaeotropics wet evergreen forest = 144/28.3, semi-deciduous moist forest = 104/4.4, forest-savannah transition = 121/14.1; the corresponding vegetation richness/diversity was 100/36.7, 80/38.7 and 71/39.4 (Neotropics), and 101/54.8, 87/45.5 and 71/34.5 (Palaeotropics). No consistent relationship was found between palynological richness/diversity, and plot vegetation richness/diversity, due to the differential influence of other factors such as landscape diversity, pollination strategy, and pollen source area. Palynological richness exceeded vegetation richness, while pollen diversity was lower than vegetation diversity. The relatively high global diversity of tropical vegetation was found to be reflected in the pollen rain.