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Gap Related Disturbance in Mixed Mountain Forests at Mt. Dalaoling in the Three Gorges ￠ò. Topographic Patterns Numerical Classification and Ordination of Pine and Oak Mixed Forest Communities in the Middle Part of Qinling Mountains LAND COVER DYNAMICS OF DIFFERENT TOPOGRAPHIC CONDITIONS IN BEIJING Factors affecting soil organic carbon density in Betula albo-sinensis forests on the southern slope of the Qinling Mountains Effect of topographical factors on podophyllotoxin content in Sinopodophyllum hexandrum and study on ecological suitability