Study On Seed Bank And Seedling Sapling Regeneration Of Grass-Larix Gmelinii Forests

In this study,we studied the seed bank,seedling tree regeneration and tree distribution pattern of Larix gmelini mid-order forest,near mature forest,mature forest and over-mature forest.The results showed that the Larix gmelini forest The best seedling stage and the ability to realize the natural regeneration of the population in different age stages are very important for the evaluation of the natural regeneration ability of Larix gmelini and the optimization of stand structure.?Univariate analysis of variance showed that there were some differences in the seeding rate and soil seed bank of four age groups.With the increase of age,the amount of seedling and soil seed bank increased first and then decreased,and the number of mature forest seeds was the highest.The proportion of non-viable seeds in seed bank was more than 90%,averaging only 4.21%seed for soil germination The seeds were mainly distributed in the litter layer,and the number of seeds decreased gradually with the increase of soil depth.?With the increase of age,the number of seedlings increased,and the density of mature forest was the highest.After the seedlings with seed bank correlation analysis showed that there was a positive correlation with seed vigor seedlings;quadratic function and Colel function with regeneration seedling number distribution,all stand and various species of R2>0.853,P<0.05.? The pattern of horizontal distribution of seedlings,saplings and trees were analyzed.The results showed that the seedlings and trees were clustered,and the aggregation degree of seedlings and saplings was strong,and the aggregation degree of trees was not obvious and tends to be distributed randomly.