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Death causes and conservation strategies of the annual regenerated seedlings of rare plant, Bretschneidera sinensis Studies of in Vitro Culture and Plant Regeneration of Unfertilized Ovary of Pumpkin MICROENVIRONMENT OF FOREST GAPS AND ITS EFFECTS ON THE GROWTH OF NATURALLY REGENERATED SEEDLINGS OF DIFFERENT AGES IN SUBALPINE ABIES FAXONIANA FOREST