Journal of Geographical Sciences ›› 2009, Vol. 19 ›› Issue (6): 660-670.doi: 10.1007/s11442-009-0660-5

• Climate and Environmental Change • Previous Articles     Next Articles

Significance of pollen and spores distribution to the barrier function of the Longitudinal Range-Gorge Region, Southwest China

PAN Tao1,2, WU Shaohong1,3, DAI Erfu1, LIU Yujie1,2, DOU Yue1,2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China|
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China|
    3. Institute of Tibetan Plateau Research, CAS, Beijing 100085, China
  • Received:2009-03-17 Revised:2009-06-22 Online:2009-12-25 Published:2009-12-25
  • Supported by:

    National Basic Research Program of China, No.2003CB415101

Abstract:

35 surface soil samples and 28 profile soil samples were collected in Longitudinal Range-Gorge Region, Southwest China. The distribution of pollen and spores and their relationship with the environment are analyzed. The results show that there are significant differences in pollen and spores taxa, amounts, dominant taxa and florae between the eastern and western flanks of the Ailao Mountain. There are more pollen and spores taxa, a greater amount and complexity on the western flank of the mountain than those on the eastern flank, while the dominant taxa are more centralized and prominent on the eastern flank of the Ailao Mountain. As for the plant florae distribution, there are significant differences in the number of taxa and composition between the eastern and the western flanks. The analysis of profile pollen and spores assemblage shows that its trends of variation are basically in accordance with the surface pollen and spores, which are also indicators of the environmental differences between the two flanks of the mountain. These significant spatial differences of pollen and spores are very close to the regional topography and climate difference. The mountain running perpendicular to the moisture-laden air flow serves as a barrier and the monsoon circulations the east and the west of the mountain result in different energy-moisture characteristics. We conclude that the main patterns of the pollen and spores can be attributed to the environmental differences.

Key words: pollen and spores, spatial distribution, environmental difference, Longitudinal Range-Gorge Region