Characteristics of Soil Respiration in Quercus aliena var. acuteserrata Forest and Its Clear-Cutting Site in Dormant Period Assessment of Freezing Tolerance of Juglans Germplasms by Using Annual Dormant Branches Variability Analysis of Turfgrass Physiological Process during Winter Dormant Period Assessment of Freezing Tolerance of Juglans Germplasms by Using Annual Dormant Branches Soil respiration in Pinus tabulaeformis forest during dormant period at Huoditang forest zone in the Qinling Mountains