Biodiversity Science ›› 2016, Vol. 24 ›› Issue (4): 399-406.doi: 10.17520/biods.2015245

Special Issue: Plant Diversity in the Dry Valleys of Southwest China

• Original Papers • Previous Article     Next Article

Impacts of geographical distances and environmental differences on the beta diversity of plant communities in the dry-hot valley of the Yuanjiang River

Xinhui Li1, 2, Yanhong Liu1, 2, Ye Liu3, Yue Xu4, Yang Yang4, Zehao Shen4, *()   

  1. 1 College of Environmental Science and Technology, Southwest China Forestry University, Kunming 650224.
    2 National Station for Forest Ecosystem in Yuxi, Yuxi, Yunnan 653400.
    3 School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, Guangdong 518055.
    4 Department of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871
  • Received:2015-09-14 Accepted:2016-03-12 Online:2016-05-11
  • Shen Zehao E-mail:shzh@urban.pku.edu.cn

Beta diversity is the difference in species composition between locations. Recently, much of the published biodiversity research has focused on the assessment of beta diversity because it can be used to investigate community assembly and maintenance of species diversity. In this study, we investigated the impacts of dispersal limitation and habitat on the beta diversity of communities by sampling 41 plots throughout the dry-hot valley of Yuanjiang River. Taxonomic beta diversity and phylogenetic beta diversity were quantified using Jaccard dissimilarity, mean nearest taxon distance (MNTD), and mean pairwise distance (MPD). These indices were then related to the differences in environmental characteristics between sample plots and the geographical distances separating sample plots using multiple regression on distance matrices (MRM) and variance partitioning. The results showed that taxonomic and phylogenetic beta diversity indices significantly increased with the spatial distance and difference in mean annual temperature between communities; that taxonomic beta diversity and MNTD were most strongly influenced by spatial distance, whereas MPD was equally influenced by spatial distance and mean annual temperature difference between communities; and that only 11-13% of the variance in beta diversity was explained by the spatial distance and mean annual temperature difference between communities. These results highlight the effects of niche and dispersal limitations on beta diversity, and suggest that dispersal limitation may play a greater role than habitat differences between plant community locations. Additionally, human disturbances may greatly impact species composition along the dry-hot valley of the Yuanjiang River.

Key words: community assembly, phylogenetic beta diversity, niche, dispersal limitation, human disturbances

Fig. 1

Distribution of 41 sample sites along the dry-hot valley of the Yuanjiang River in Yunnan Province"

Fig. 2

Phylogenetic tree with branch lengths for the sample plants in the dry-hot valley of the Yuanjiang River. Based on the phylogenetic tree of Zanne et al (2014)."

Fig. 3

Relationships between beta diversity and the differences in mean annual temperature, mean annual precipitation and geographical distance in sample sites"

Fig. 4

Percentage of variance of beta diversity across 41 plots explained by the differences in mean annual temperature, mean annual precipitation, and geographical distance in sample sites (Values < 0 not shown). A, Jaccard dissimilarity; B, Mean pairwise distance; C, Mean nearest taxon distance."

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