Species Diversity and Its Relationship with Soil Factor under Different Site Conditions in Desert-oasis Ecotone
Vegatation and soil surverys were conducted under different site conditions in 2007-2011 to study species diversity using richness indices, evenness indices and diversity indices, in the middle reaches of Heihe River Basin, meanwhile the relationship between species distribution and soil enviromental factors was also studied by the canonical correspondence analysis. The results showed that the vegetation covers and species diversity were the highest in the interdune lowland, they were the lowest in the mobile dune; the result of the Hill's index (diversity ordering) showed the species diversity reduced along with soil water content decreasing, the orders of species diversity was interdune lowland, flat slope, fixed dune, semifixed dune and mobile dune. The degree of influences of soil factors on vegetation distribution was soil water con-tent>pH>total K>organic matter>available N> total N> available K> total P> saline content> available P, soil water content and pH were important factors significantly affecting spatial distribution difference of vegetation, the explanation of environmental was 98% , proof sorting credible.
NETL
NSTL
万方数据
维普
