Natural Regeneration of Primitive Korean Pine Forests in Response to the Variation in Continuous Small Elevation Gradient
With natural regeneration of Korean pine seed stands in NO.56 Forest compartment of Dong Zhelenghe Nature Reserve belonging to Xiaoxing'an Mountains,three levels in 12 plots included the lower slopes in forest compartment (Plots A,B,C,D,E,F),the lower-middle slopes (Plots G,H,I) and the central slopes (Plots J,K,L) were sited based on small elevation gradient (changed from three to fifteen meters).Without human disturbance,as the elevation gradient was increased,conifers replaced companion broadleaves gradually in the Tachiki layer.Gap between conifers and companion broadleaves was reduced gradually.The number of update trees was increased including Korean pine.Under human disturbances,some plots of understory vegetation cover were more than 10％ on average,and had a bad update.In this scenario,Heliousphytes Broadleaves such as Acertegrnentosum Maxim,Acerukurunduense Trautv had a smaller advantage on regeneration than Coniferous,and Korean pine had a few update young trees.Korean pine is a dominant species in this forest community although it has a few Tachiki numbers and increased slowly.Korean pine has unanimous trends in importance value and percent area,both them showed a steady growth with altitude increasing.Elevation changing has no influence in spatial distribution pattern of Tachiki layer for Korean pine.Korean pine showed randomly distributed or no regeneration in lower altitudes,while aggregated distribution in medium altitude,and a randomly distribute in advantage layer at last by intense natural succession.
Xiaoxing'an MountainsPrimitive Korean pine forestContinuous small gradient elevation changesNatural regenerationSpatial pattern
NETL
NSTL
万方数据
维普
