An Analysis on Niche and Degree of Spatial Association of Paeonia decomposita Community
Understanding endangering mechanisms of Paeonia decomposita, endemic to China, is very crucial to protect and utilize this valuable germplasm. However, little was known on the niche characteristics and relationships of Paeonia decomposite and associated shrubs species in dry valleys of Dadu River. We investigated niche breadths, niche overlaps and spatial associations of P. Decomposita and associated shrub species in dry valley of Dadu River, south-western China. The standard niche breadth of P. Decomposita, Berberis julianae, Zanthoxylum simullans, Quercus baronii, Cotoneaster divaricatus, Rosa spp. , Berberis wilsonae, Cotoneaster horizontalis, Bauhinia faberi var.Microphylla was0.745, 0.979, 0.950, 0.748, 0.947, 0.924, 0.792, 0.863, 0.610, respectively. Niche overlapping values of P. Decomposita and the dominate species B. Julianae, Z. Simullans, C. Divaricatus, Rosa spp. Were over 0.50, which were higher than those between P. Decomposite and the other species. Combined with the analysis of spatial associations of P. Decomposita and associated shrub species in dry valley of Dadu River, it was concluded that P. Decomposita had weak ability to utilize resources because of its small niche breadth, and was in a disadvantaged position within species competition, which significantly contributed to understanding of endangereing mechanism P. Decomposita.
NETL
NSTL
万方数据
维普
