Permafrost Degradation Induces the Abrupt Changes of Vegetation NDVI in the Northern Hemisphere

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES Earths Future Pub Date : 2024-10-05 DOI:10.1029/2023EF004309
Yanpeng Yang, Xufeng Wang, Tonghong Wang
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Abstract

Permafrost, widely distributed in the Northern Hemisphere, plays a vital role in regulating heat and moisture cycles within ecosystems. In the last four decades, due to global warming, permafrost degradation has accelerated significantly in high latitudes and altitudes. However, the impact of permafrost degradation on vegetation remains poorly understood to date. Based on active layer thickness (ALT) monitoring data, meteorological data and normalized difference vegetation index (NDVI) data, we found that most ALT-monitored sites in the Northern Hemisphere show an increasing trend in NDVI and ALT. This suggests an overall increase in NDVI from 1980 to 2021 while permafrost degradation has been occurring. Permafrost degradation positively influences NDVI growth, with the intensity of the effects varying across land cover types and permafrost regions. Furthermore, based on Mann-Kendall trend test, we detected abrupt changes in NDVI and environmental factors, further confirming that there is a strong consistency between the abrupt changes of ALT and NDVI, and the consistency between the abrupt change events of ALT and NDVI is stronger than that of air temperature and precipitation. These findings work toward a better comprehending of permafrost effects on vegetation growth in the context of climate change.

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永冻土退化导致北半球植被 NDVI 突然变化
永久冻土广泛分布于北半球,在调节生态系统内的热量和水分循环方面发挥着至关重要的作用。在过去 40 年里,由于全球变暖,高纬度和高海拔地区的永久冻土退化速度明显加快。然而,迄今为止,人们对永久冻土退化对植被的影响仍然知之甚少。基于活动层厚度(ALT)监测数据、气象数据和归一化差异植被指数(NDVI)数据,我们发现北半球大多数ALT监测点的NDVI和ALT均呈上升趋势。这表明,从 1980 年到 2021 年,在永冻土发生退化的同时,归一化差异植被指数总体呈上升趋势。冻土退化对归一化差异植被指数的增长有积极影响,不同土地覆被类型和冻土地区的影响强度各不相同。此外,基于 Mann-Kendall 趋势检验,我们检测到了 NDVI 与环境因子的突变,进一步证实了 ALT 与 NDVI 的突变具有很强的一致性,且 ALT 与 NDVI 的突变事件之间的一致性要强于气温和降水。这些发现有助于更好地理解气候变化背景下冻土对植被生长的影响。
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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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