气候变化背景下1964-2015年秦岭植物物候变化

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 气候变化背景下1964-2015年秦岭植物物候变化 DOI: 10.5846/stxb201702200277 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家林业公益性行业科研专项（201304309） Variation in plant phenology in the Qinling Mountains from 1964-2015 in the context of climate change Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:以1964-2015年物候观测数据为基础，选取17种含乔木、灌木及藤本树种为研究对象，分析探讨了气候变化背景下秦岭地区植物物候变化规律及其差异性。结果表明：①52年来，秦岭地区物候始期普遍呈提前趋势，提前速率1.2d/10a，物候末期普遍呈推迟趋势，推迟速率3.5d/10a，物候生长期普遍延长；②秦岭地区物候突变发生于20世纪80年代，始期于1985年，末期于1984年。突变后，物候特征发生了显著变化，始期的提前速率较突变前显著加快，末期由突变前的提前趋势转变为极显著的推迟趋势，且变化速率和显著性均高于始期；始期与末期变化均表现出"趋同效应"；物候年代际变化趋势显示，始期自2001-2005年起提前速率减缓，植物对气候变化的响应表现出适应性及滞后性。③秦岭物候变化存在树种差异，3大类树种始期的提前速率呈藤本、乔木、灌木依次增大，而末期的推迟速率则呈藤本、灌木、乔木依次减小。④秦岭物候变化存在南北差异，北坡始期的提前速率均高于南坡，而南坡末期的推迟速率均高于北坡。 Abstract:In the context of global climate change, plant phenology has become the subject of intensive research. Mountains are considered indicators of global climate change. The Qinling mountain region, known as a unique geographical unit in China because of its ecological sensitivity and vulnerability, underwent a significant temperature increase in the last 50 years. Based on phenological data collected from 1964-2015, 17 plant species, including trees, shrubs, and vines, were selected as the subjects of the present study. This paper analyzes and discusses changing conditions and changes in plant phenology in the context of global climate change in the Qinling Mountains. Our analyses generated four primary results. First, over the past 52 years, the beginning of the plant phenophase has advanced at a rate of 1.2 days decade-1, and the end of the plant phenophase has delayed at a rate of 3.5 days decade-1, causing a significant prolongation of the growth period. The primary reason for this prolongation is the rising temperature in the region. There was a inconsistency on the response at the beginning and the end of the phenophase to temperature. Second, the abrupt change of phenophase occurred in the 1980s in Qinling area, the start of phenophase occurred in 1985 andthe end of phenophase did in 1984. After the abrupt change occurs, plant phenological characteristics changed significantly, compared with abrupt change before, showing that the advanced rate in the start of phenophase was faster, and the trend in the end of the phenophase turned into a very significant delay; the rate of change and the significance at the end of the plant phenophase were higher than that at the beginning of the period. These changes in the beginning and end points of plant phenophases manifest as a "convergence effect". Interdecadal variations in phenology indicate that the rate of advance in the beginning of plant phenophases slowed from 2001 to 2005, and that the response of plants to climate change showed qualities of adaptability and hysteresis. These results indicate that the dominant factor leading to changes in the beginning and end points of the plant phenophase was temperature, and that the response of plant phenology to changes in temperature is particularly sensitive, further demonstrating that there is a correlation between plant phenophase and climate change. Third, changes in phenophase varied by species. The advancement of the beginning of the phenophase promoted the prevalence of shrubs, trees, and vines, in this order, at the beginning of the phenophase, whereas the delay in the ending of the phenophase decreased the abundance of trees, shrubs, and vines, in this order, at the end. These differences in abundance are related to differences in physiological characteristics between the different species in response to climate change. Finally, plant responses to climate change in the Qinling Mountains differed along a north-south axis. The rate of advance in the beginning of the phenophase was higher in the northern slope than in the southern slope, whereas the rate of delay in ending of the phenophase was more severe in the southern slope than in the northern slope. 参考文献 相似文献 引证文献