民勤荒漠区16种植物物候持续日数及其积温变化

中国西北荒漠区植物物候随气温变暖表现为提前趋势。本文以甘肃民勤荒漠区16种植物34年的物候观测资料,采用一次趋势线方程研究了荒漠区植物在物候提前的过程中,物候日数变化和物候期积温变化。结果表明,随着气温升高,物候持续日数表现出一定的增长趋势。物候持续期积温增加显著,而且春、秋两季是积温变化较敏感的季节。积温的增减在很大程度上是由物候持续日数增加或减少引起的,其次才是由于气温增高引起的。表明,随着气温的增高或降低,植物的物候持续日数并不能无限制地缩短或延长。

Changes in duration days and accumulated temperature of 16 plant species phenology in Minqin desert area

With climate warming,the plant phenology in Northwest China desert area has an advancing trend. Based on 34-year phenological observation data of 16 plant species in the Minqin desert area of Gansu,and by using one linear trend equation,this paper analyzed the changes in the duration days of the phenology of these plant species and in the accumulated temperature in the phenological duration. With the increase of air temperature,there was an increasing trend in the duration days of the phenology. The accumul...