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Effects of Selective Cutting on Stand Growth and Structure for Natural Mixed Spruce (Picea koraiensis )-Fir (Abies nephrolepis) Forests Species composition and main populations spatial distribution pattern in Korean pine broadleaved forest in Xiaoxing’an Mountains of Northeast China. Effect of Stand Density on Community Structure and Ecological Effect of Eucalyptus urophylta×E.eamalducensis Plantation