| Study on Regeneration Response of The Schrenk Spruce Forest under Two Different Disturbances liu yun (Forest management) Surpervised by: Pan cunde Abstract Disturbance is a driving force of forest growth cycle; It is the alternate actions oC endogenous disturbance and exogenous disturbance that promote forest growth cycle ,accelerate regeneration succession of forest ecosystem and make it develop for ever. Main content of this paper is about study on regeneration response of Schrenk spruce(picea Schrenkiana Fisch,et Mev. var. tianshanica) under violently selective logging and canopy disturbances, in order to supply the theoretic introduction for sustained management the Scbrenk spruce. First, by the point pattern analysis method , analyses on spi*ial pattern of reserved trees and the relationship between trees of different types in the same stand after violently selective logging shows that within the whole scale , Schrenk spruce over 50 years old ,there was the aggregated distribution between over 50 years and below 50 years ,there was a change alignment of negative correlation ,no correlation ,positive correlation between below 50 years old and cutting trees ,mainly there was the positive correlation .Second, based on study on canopy gap-phase features, still by point pattern analysis method ,analyses on spatial distributiomi pattern of Schrenk spruce in gaps and relationship of regeneration seedling, sapling, gap maker shows that after canopy disturbance ,mainly there was the aggregated distribution between seedling in canopy gaps , along with the biggest aggregated scale in every aggregated distribution , there was a change alignment of negative correlation, no correlation ,positive correlation between gap maker and seedling in gaps. Finally ,with progression regression method, this paper analyses relation between species diversity indexes and environment factors, conclude the main factors influencing species diversity indexes. |
PDF Full Text Request