1. College of Food Science and Engineering, College of Enology, Shaanxi Provincial Key Laboratory of Viti-Viniculture, Viti-viniculture Engineering Technology Center of State Forestry and Grassland Administration, Shaanxi Engineering Research Center for Viti-Viniculture, Heyang Viti-viniculture Station, Ningxia Helan Mountain Eastern Foot wine Station, Northwest A&F University, Yangling, China