Species similarity between vegetation and soil seed bank in Tianshan spruce forest
[Objective]The soil seed bank has a significant impact on vegetation renewal and restoration,and is of great significance for the biodiversity protection and vegetation renewal and restoration of the Tianshan spruce forest ecosystem.[Methods]The soil seed bank of Picea schrenkiana var.tianshanica forest was taken as the research object,and field sampling investigation was combined with indoor germination to explore the species similarity between the soil seed bank and aboveground vegetation.[Results]Within the altitude range of 1,600 to 2,700 meters,the Jaccard coefficients of aboveground vegetation and soil seed banks were between 0.216 and 0.469,and the Sorensen coefficients were between 0.356 and 0.639,indicating moderate dissimilarity;The similarity coefficient of soil seed banks varied with the similarity coefficient of vegetation,and the similarity coefficients of the two were positively correlated;The diversity of aboveground vegetation species was much greater than that of soil seed banks,and there was a positive correlation between aboveground vegetation species diversity and seed bank species diversity.[Conclusion]With the increase of altitude,the similarity between soil seed banks and aboveground vegetation species generally increases first and then decreases.The species diversity of aboveground vegetation is higher than that of soil seed banks.Species diversity decreases with increasing altitude.