气候变化对荒漠区5种主要灌木植物物候的影响

Impacts of climate change on the phenological phases of five main shrub species in the desert region

物候常作为指示气候变化的一项可靠指标,基于物候资料分析气候变化对荒漠区5种灌木物候的影响,对阐明荒漠生态系统碳循环具有重要意义。因此,本研究采用一元线性回归法和相关分析法对阿拉善左旗荒漠区5种灌木30年来的物候及其对应的气象数据进行了分析,结果表明,1)1983-2012年研究区增温明显,气温平均增幅0.43℃·10a-1,降水量无显著变化,气候朝着暖干化方向发展;2)5种灌木春季物候均表现出提前的趋势,枯黄期则表现出显著的提前或不明显的推后趋势,生长季长度有所延长;3)3月均温、4月均温和10月均温对研究区5种灌木物候期影响显著,月降水量仅与白刺(Nitraria tangutorum)的春季物候期呈显著(P<0.05)或极显著(P<0.01)的相关关系。

Phenology is often used as a reliable indicator of climate change. Based on the analysis of phenological data, the effects of climate change on the phenological phases of five main shrub species in desert region were found. The findings are significant in clarifying the carbon cycle of the desert ecosystem. A study was per- formed on the phenological and corresponding meteorological data of five shrub species in the desert area of the Alashan Left Banner league of Inner Mongolia in the past 30 years by using simple linear regression and correla- tion analysis. The results indicate 1） from 1983 to 2012, the temperature increases obviously in the study area, and its climatic tendency is 0.43℃·10a-1. No significant change in precipitation was found. The climate shows a warm and dry trend in the data. 2） The spring phenophase of the five shrub species is shorten. The withering stage showed either a significant advance or no obvious backward trend, and the growing season has extended. 3） The mean temperature in March, April, and October have significant effects on the phenological phases of five shrub species. There is significant or extremely significant correlation between the monthly pre- cipitation and the spring phenophase of Nitraria tangutorurn.