Species Diversity Patterns, Species Abundances And Spatial Distribution Along A Succession Gradient In Sub-alpine Meadows Of The Eastern Qinghai-Tibetan Plateau

The interrelationships among sampling area, species richness, species abundance, and the spatial distribution has been plagued by ecologists for a long time. There are three frameworks has been universal. The first one, Species area relationship has been widely accepted, that is to say species diversity increases with the increase of the sampling area. The second pattern predicts species diversity decreased with the increase in species dominance. The third relationship is that intraspecific aggregation of individual space will lead to a decline in species diversity. In other words, abundance of species distribution and spatial distribution pattern determined the species diversity. We use species abundance distribution and the spatial distribution of the theoretical model of the eastern edge of the Qinghai-Tibet Plateau at different successional stages of sub-alpine meadow species diversity of the formation mechanism. We first use the data of1,3,7years in succession and natural grazing collected to study the actual species-area curve, then fitting species abundance and species aggregation degree model point of view both of these models can actual species-area curve. We found that the actual species-area curve along a successional gradient approximately accords with the form of the logistic curve. Species abundance and species degree of aggregation species area model can well fit the actual area curve form. But we actually all research plots species showed a significant spatial aggregation distribution, the premise of this species and species of the degree of aggregation model assumptions (species spatial distribution is random) is completely opposite. These results suggest that in the sampling area and species abundance distribution and spatial aggregation degree model is not able to determine the species diversity of the sub-alpine meadow. Therefore, we need a more reasonable spatial aggregation model to explore the sub-alpine meadow species diversity mechanism. These results can also be caused by ecologists to carry out more theoretical work and field trials to explore the diversity maintenance mechanism.