Population Expansion Of Rhodiola Fastigiata Affect On Commuity Stability Of Abies Georgei Var. Smithii And Sabina Saltuaria

Sabina saltuaria pure forest, Abies georgei var. smithii pure forest and mixed forest of Sabina saltuaria and Abies georgei var. smithii in Tibet Sejila Mountain were studied. Regeneration of Rhodiola fastigiata and dominant species in different forest type were explored to understand the regeneration status of Rhodiola fastigiata and regeneration characteristics of dominant species. A theoretical basis was provided for the Rhodiola fastigiata conservation and sustainable management of virgin forests in Sejila Mountain.By studying Sabina saltuaria regeneration, Abies georgei var. smithii regeneration and population expansions of Rhodiola fastigiata Sabina saltuaria pure forest, Abies georgei var. smithii pure forest and mixed forest of Sabina saltuaria and Abies georgei var. smithii. Population expansion of Rhodiola fastigiata was explored to understand the compliance on Sabina saltuaria regeneration and Abies georgei var. smithii regeneration to demonstrate the stability of their community.The results show that:1. Rhodiola fastigiata regeneration is better in sunny slope than in shady slope. Rhodiola fastigiata which was not dominant regeneration can not be good.2. Sabina saltuaria regeneration which was very few belonged to recession population while Abies georgei var. smithii regeneration which was sufficient belonged to growth population in mixed forest of Sabina saltuaria and Abies georgei var. smithii. Abies georgei var. smithii regeneration which was sufficient belonged to growth population in Abies georgei var. smithii pure forest. Sabina saltuaria regeneration which was sufficient belonged to stable population in Sabina saltuaria pure forest.3. The species diversity is low in Abies georgei var. smithii pure forest. As a strong advantage of Abies georgei var. smithii, other shrubs gradually decreased and died. Stand structure becoming more and more single. Rhododendron occupied the most space excluding which Abies georgei var. smithii occupied. 4. Plants of sample sites and the surrounding in Sejila Mountain according to biological characteristics mainly positive species. These species were strongly heliophilous while there was a greater demand on the light.