Seedbank in temperate regions is classified as persistent or transient, according to whether the germinable seeds were detected throughout the year or not, respectively. The first crucial step in the formation of seedbank is burial. In general, deep buried seeds can keep viability until the second or some subsequent germination season, whereas seeds nearer the ground surface germinate and disappear soon. Ground surface environments significantly affect the vertical movement of seeds after landing, and therefore, should be closely related to seedbank persistence. Plant litter gradually covers the ground surface with succession. Litter accumulating process may change the fate of seeds and seedbank persistence.
We investigated 1) seed viability after one year burial at different depths and 2) vertical seed movement after landing for Drosera rotundifolia (seed mass 0.011 ± 0.003 mg), Lobelia sessilifolia (0.250 ± 0.041), Rhynchospora alba (0.873 ± 0.127) and Moliniopsis japonica (1.820 ± 0.403), in three different successional stages with different litter thickness on the post-mined peatland, Sarobestu Mire.
Seedbank persistence of each species could change with succession, because litter accumulation determines both the seed longevity and vertical seed movement after landing in the post-mined peatland. These litter-controlling processes may be related to the changes in species richness and density of seedbank along succession.