关键词: 陕北, 红枣, 气候变化, 物候期

Abstract:

Based on meteorological and phenophase observations during 1970-2010 in eight jujube planting counties in Shaanxi Province, for eight stages of jujube growth such as the year-round, the growing season, the budding stage, the flowering stage, the young fruit stage, the crisp ripe harvest stage, the defoliation stage and the dormant stage, the variation of climatic resources, meteorological disasters and their impaction on phenophase in jujube planting area were analyzed. The results show that average temperature increased and sunshine hours decreased in all growing stages, while precipitation trends was inconsistent. In the 1970s,1980s,1990s and 2000s, the jujube growing season presented climatic characteristic with cold and wet, cold and wet, warm and dry and warm and wet, respectively. Among meteorological disasters influencing jujube production, it showed that rainy weather reduced during the flowering stage but increased during the crisp ripe harvest stage. The phenophase showed a weak extension trend in Jiaxian during the whole growth period of jujube. When average temperature during the flowering and young fruit stages increased 1 ℃, the young fruit and crisp harvest periods were 0.6 d and 0.8 d in advance, and when precipitation from the flowering stage to early September increased 1 mm, the crisp harvest period delayed 0.3 d.

Key words: northern Shaanxi, jujube, climate change, phenophase