Fig 1.
A general overview of Ma’anling volcano park (study site), at Haikou, Hainan Province, China.
The grid consisted of 100 quadrats. The length of each quadrat is 1 km.
Table 1.
Families with more than 6 species.
Fig 2.
The percentage of plant distribution types at the family and generic levels.
1. Pantropic distribution 2. Tropical Asia and tropical America disjuncted distribution3.Old world tropics distribution 4.TropicalAsia to tropical Australasia distribution 5.Tropical Asia to tropical Africa distribution 6.Tropical Asia (Indo-Malesia) distribution 7.North temperate distribution 8. East Asia and north America disjuncted distribution 9. Center Asia distribution 10. East Asia distribution 11. Tropical Africa and tropical America disjuncted distribution.
Fig 3.
Plant diversity indices of different life forms in different land use types.
Error bars were constructed with one standard deviation of the means. Here, d refers to Berger-Parker index, He refers to Shannon index, Je refers to Pielou evenness index. Different letters represented significant differences at p = 0.05 among the three different vegetation types.
Fig 4.
Phylogenetic diversity indices for different vegetation types.
Error bars were constructed with one standard deviation of the means. PD refers to phylogenetic diversity. Ntaxa refers to the number of species. MPD refers to mean phylogenetic distance. MNTD refers to mean nearest taxon distance. Different letters represented significant differences at p = 0.05 among three different vegetation types.
Table 2.
Nonmetric Multidimensional Scaling (NMDS) ordination based on soil physic-chemical properties and plant diversity, WC: Water content; TN: Total nitrogen; AP: Available phosphor; AK: Available potassium; SOM: Soil organic matter.
Fig 5.
Scatter plots of net relatedness index (NRI), nearest taxon index (NTI), Shannon index (He), Beger-parker index (d), phylogenetic diversity (PD), number of taxa (ntaxa, the number of species) and soil physic-chemical properties.
The dependent variable include: taxonomic and phylogenetic diversity(d, He, Je, PD, ntaxa, NRI, NTI) of different life forms(tree, shrub, herb, all species). The independent variables include: WC, TN and SOM. Single factor regression analysis were established.
Table 3.
Summary statistics of soil physic-chemical properties, WC: Water content; TN: Total nitrogen; AP: Available phosphor; AK: Available potassium; SOM: Soil organic matter, coefficient of variance (CV).