民勤荒漠区物候与四季划分

利用民勤荒漠区30a以上的气温和植物物候观测资料对比分析以气温划分的四季和以物候划分的四季间的区别。结果表明：在民勤荒漠区，气温四季的春季来临过迟，冬季来临过早，以物候划分的四季更适合当地季节变化；如果以气温划分四季，在低纬度地区就会没有冬季，而在高寒地区就会没有夏季，因而，物候四季较气温四季的适用范围广泛，且与农业生产具有更为直接的联系。但是，以物候现象观测四季时，应同时观测多种指示性物候；在选择指示性物候时，应注意选择在当地有代表性的、生长健康的植物。

Plant Phenology and Four Seasons Division in Desert Area of Minqin County of Gansu Province

Based on the data of the temperature and the plant phenology observations over 30 years in the desert areas of Minqin County of Gansu Province, the differences between four seasons divided by temperatures （temperature-seasons） and the plant phenology （phenology-seasons） were analyzed. The results indicated that the spring of temperature-seasons postponed, while the winter of temperature-seasons advanced. The phonological seasons were more suitable for local seasonal variations. If four seasons were divided by the temperature, there would be no winter in the low latitude areas, and no summer in the high latitude and cold areas. Therefore, phenological seasons were more applicable than temperature-seasons and more directly related to agricultural activities. However, more phonological indicators should be simultaneously observed as the phenology-seasons were used. By choosing phenology indicators, the locally adapted and well grown plants should been applied.