The effects of different components of the forest ecosystem on water quality in the Huoditang forest region, Qinling Mountain Range PRELIMINARY STUDIES ON THE POPULUS DAVIDIANA FORESTS IN QINLING MOUNTAINS AND LOESS PLATEAU OF NORTHERN SHAANXI PROVINCE STUDY ON CALLUS INDUCTION AND PLANT REGENERATION FROM THE MATURE ORGANS OF Lilium longiflorum Thunb. IN QINLING MOUNTAIN Constructive Species’ Coexistence Mechanisms of PineOak Mixed Forest in Qinling Mountains Based on the Niche Differentiation Composition and dynamics of seed rain in four species of Fagaceae in Qinling Mountains A Revision of Paeonia in Qinling Mountains Seedling regeneration and  affecting factors of Quercus variabilis in  different distribution regions. Characteristics of seedlings regeneration in Quercus aliena var. acuteserrata secondary forests in Qinling Mountains Pachysandra axillaris Franch., A Newly Recorded Species of Qinling Mountain, China Storage and Decomposition of Fallen Wood in a Pinus tabulaeformis Secondary Forest at Huoditang Forest Region in the Qinling Mountains Response of Stream Water Chemistry to Rainwater Acidification in the Natural Forest Region of the Qinling Mountains Interspecific Associations and correlation of main species in the Succession Process of Pine Oak Forests Community on the South-facing Slopes in Qinling Mountains Spatial Structure Characteristics of Quercus aliena var.acuteserrata Secondary Forest on South Slope of Qinling Mountains