秦巴山地极端气候变化特征及其对植被动态的影响
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河南大学地理与环境学院

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中图分类号:

P423.3

基金项目:

国家重点研发计划(2021YFE0106700);国家自然科学基金项目(42201110)


The impacts of extreme climate events on vegetation dynamics in the Qinling-Daba Mountains
Author:
Affiliation:

1.College of Geography and Environmental Science, Henan University, Kaifeng 475004, China;2.1. College of Geography and Environmental Science, Henan University, Kaifeng 475004, China;3.2. Research Center of Regional Development and Planning, Henan University, Kaifeng 475004, China;4.3. Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Region, Henan University, Ministry of Education, Kaifeng 475004, China

Fund Project:

the National Key Research and Development Program of China under grants (2021YFE0106700) and the National Natural Science Foundation of China under grants (42201110).

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    摘要:

    全球变暖引起的极端气候变化对植被产生了重大影响,然而,秦巴山地极端气候事件的时空变化及其对植被的影响尚不清楚。基于秦巴山地及其周边115个气象站逐日气象资料(1960~2020年)及MODIS NDVI数据集(2020~2020年),分析了秦巴山地NDVI的时空变化特征及其对19个极端气候指数的响应,并利用地理探测器定量评估了极端气候指数对NDVI的影响。结果表明:①2000~2020年秦巴山地大部分区域NDVI呈显著增加趋势(80.34%),少数区域呈显著下降区域(1.09%),年际变化速率约为0.03/10a;②1960~2020年秦巴山地经历了显著增温,夜间增温幅度大于白天,极端气温事件变化幅度较大的区域主要集中在西秦岭;极端降水事件呈微弱变化,具有明显的空间分异,研究区西南部极端降水强度增加,东部极端降水强度降低,极端降水频率增加;③极端降水事件是影响西秦岭地区NDVI的主要因素,而极端气温事件是影响秦岭和大巴山地区NDVI的主要因素;极端气候事件对NDVI的影响不是独立的,极端气候指数之间的相互作用以双因子或非线性的方式增强了单因子对NDVI的影响。研究结果可为应对全球气候变化下秦巴山地植被保护与恢复提供科学依据。

    Abstract:

    Global warming has contributed to extreme climate events that have had a significant impact on vege-tation. However, the spatio-temporal changes in extreme climate and its influence on vegetation remain unclear in the Qinling-Daba Mountains (QBMs). Based on satellite-derived Normalized Difference Vegetation Index (NDVI) and meteorological datasets, we analyzed the spatio-temporal variations of the NDVI and its response to 19 extreme climate indices in the QBMs. Geographic detector was used to identify the contribution rate of extreme climate indices and their influence on the NDVI. The results indicated that the NDVI significantly increased in the majority of the QBMs (80.34%) and decreased in only a few regions (1.09%) from 2000 to 2020. Noticeable warming was observed in the QBMs from 1960 to 2020, with the temperature increasing more at night than during the day, and regions with a larger change in the extreme temperature events were mostly found in the Western Qinling Mountains (WQMs). During the study period, extreme precipitation events showed weak changes, extreme precipitation intensity increased in the southwestern QBMs, while in the eastern QBMs, extreme precipitation intensity decreased but extreme precipitation frequency increased. Additionally, significant spatial variations were observed in the NDVI reaction to extreme climate indices in the QBMs. The correlations between extreme precipitation indices and the NDVI were higher than those between extreme temperature indices in the WQMs, whereas inverse relationship were observed in the Qinling Mountains (QMs) and Daba Mountains (BMs). We also found that the influence of extreme climate indices on NDVI was not independent, and the interaction between the extreme climate indices amplified the influence of a single index on NDVI in both double-factor or nonlinear ways. The paper can establish scientific evidence for the protection and restoration of vegetation in the QBMs in response to global climate change.

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历史
  • 收稿日期:2023-11-10
  • 最后修改日期:2023-12-16
  • 录用日期:2023-12-27
  • 在线发布日期: 2024-04-29
  • 出版日期: