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| 大兴安岭植被变绿速率对霜冻的响应研究 | |
| 引用本文： | 温智虹,邓国荣,赵建军,张洪岩,郭笑怡.大兴安岭植被变绿速率对霜冻的响应研究[J].地理科学进展,2021,40(5):839-847. |
| 作者姓名： | 温智虹 邓国荣 赵建军 张洪岩 郭笑怡 |
| 作者单位： | 1.东北师范大学地理科学学院/长白山地理过程与生态安全教育部重点实验室,长春 130024 2.东北师范大学地理科学学院/城市遥感应用创新中心,长春 130024 |
| 基金项目： | 国家自然科学基金项目(41871330);吉林省科技发展计划资助项目(20190103151JH) |
| 摘 要： | 气候变暖降低了霜冻发生的频率,但生长季延长使植被更容易暴露在霜冻中.同时,植被物候和光合初级生产力的变化导致植被变绿速率发生改变.大兴安岭是中国对气候变化最为敏感和最早做出响应的地区之一,该区域霜冻对不同植被变绿速率的影响还未得到充分研究.论文使用NOAA气候数据记录归一化植被指数数据,分析了 1982-2019年大兴... |
| 关 键 词： | 气候变化 变绿速率 霜冻 大兴安岭 |
| 收稿时间： | 2020-07-21 |
| 修稿时间： | 2020-12-23 |
Response of velocity of vegetation greenup to frost in the Greater Khingan Mountains |
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| WEN Zhihong,DENG Guorong,ZHAO Jianjun,ZHANG Hongyan,GUO Xiaoyi.Response of velocity of vegetation greenup to frost in the Greater Khingan Mountains[J].Progress in Geography,2021,40(5):839-847. | |
| Authors: | WEN Zhihong DENG Guorong ZHAO Jianjun ZHANG Hongyan GUO Xiaoyi |
| Institution: | 1. School of Geographical Sciences, Northeast Normal University / Key Laboratory of Geographic Processes and Ecological Security of Changbai Mountain, Ministry of Education, Changchun 130024, China 2. School of Geographical Sciences, Northeast Normal University / Urban Remote Sensing Application Innovation Center, Changchun 130024, China |
| Abstract: | Although climate warming reduces the frequency of frost, the longer growing season increases the vulnerability of plants to frost. At the same time, changes of vegetation phenology and primary photosynthetic productivity lead to changes in the vegetation greenup rate. The Greater Khingan Mountains is one of the most sensitive and earliest responding regions to climate change in China. Further study of the impacts of frost on vegetation greenup rates in this region is insufficient. This study reconstructed the vegetation greenup rate in the Greater Khingan Mountains, following which the responses of vegetation greenup rate to frost were analyzed in detail. National Oceanic and Atmospheric Administration (NOAA) Climate Data Record (CDR) Normalized Difference Vegetation Index (NDVI) data were used to study the spatiotemporal variations in vegetation greenup rates in the Greater Khingan Mountains from 1982 to 2019. This study used frost days and intensity indices to analyze the effect of frost on the rates of vegetation greenup from the beginning of the spring to the beginning of the peak vegetation growth season. The results show that during the study period, the frost days and intensity showed a downward trend, and the average decline rates were -0.24 ± 0.07 d/a and -0.036 ± 0.015 ℃/(d·a), respectively. Although decreases in frost days and frost intensity resulted in the acceleration of the greenup of forest ecosystems, the grassland ecosystem greenup rate was reduced at the same time. The response of vegetation greenup rate to frost differed among the different ecological regions. The response of vegetation greenup rate to frost events is obvious in the western forest grassland area (IIB3) and mountain deciduous and coniferous forest area (IA1) in northern Greater Khingan Mountains, and the partial correlation coefficients between the vegetation greenup rate and frost days were -0.42 (P<0.05) and -0.48 (P<0.01), respectively; and the partial correlation coefficients between the vegetation greenup rate and frost intensity were -0.49 (P<0.01) and -0.36 (P<0.05), respectively. This study highlights the effect of frost on vegetation greenup rate, and the results can provide a useful reference for understanding the response of regional vegetation to climate change. |
| Keywords: | climate change greenup rate frost Greater Khingan Mountains |
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