基于日光诱导叶绿素荧光探测干旱对黄土高原植被光合稳定性的影响
收稿日期: 2023-09-14
录用日期: 2024-04-08
网络出版日期: 2024-04-09
基金资助
国家重点研发计划(2022YFF1302501)
Detection of drought effects on photosynthetic stability of vegetation on the Loess Plateau based on solar-induced chlorophyll fluorescence
Received date: 2023-09-14
Accepted date: 2024-04-08
Online published: 2024-04-09
Supported by
National Key R&D Program of China(2022YFF1302501)
刘柯言 , 韩璐 , 宋午椰 , 张初蕊 , 胡旭 , 许行 , 陈立欣 . 基于日光诱导叶绿素荧光探测干旱对黄土高原植被光合稳定性的影响[J]. 植物生态学报, 2025 , 49(3) : 415 -431 . DOI: 10.17521/cjpe.2023.0265
Aims The Loess Plateau stands as one of China’s most susceptible regions to meteorological drought, a vulnerability exacerbated in recent years by the backdrop of climate warming. As meteorological droughts show a rising trend, investigating the capacity of vegetation to withstand and recover from drought stress becomes paramount. Understanding the resilience and resistance of vegetation’s photosynthetic physiological processes to drought is crucial for comprehending how vegetation responds to environmental shifts and for forecasting the future trajectory of vegetation development in the area.
Methods Utilizing the solar-induced chlorophyll fluorescence Global SIF dataset based on OCO-2 (GOSIF) products alongside temperature and standardized precipitation evapotranspiration index (SPEI) data, this study aims to investigate the impact of drought on the spatial and temporal stability of photosynthesis across various vegetation types and climate zones on the Loess Plateau employing the multiple linear autoregressive model.
Important findings The study revealed a linear relationship between vegetation photosynthetic resilience and the severity of drought experienced on the Loess Plateau. Vegetation photosynthetic resilience weakens in the order of mild, moderate, and severe drought. The relationship between vegetation photosynthetic resistance and drought severity exhibited a nonlinear pattern, with resistance declining from severe to mild and moderate drought. Vegetation photosynthesis on the Loess Plateau displayed insensitivity to temperature variations. Comparison across climatic zones highlighted that in arid regions, vegetation photosynthetic resilience declined with escalating drought severity, whereas semi-arid zones demonstrated relatively stable resilience. In semi-humid regions, vegetation photosynthetic resilience decreased in the order of severe, mild, and moderate droughts. Among vegetation types, forests demonstrated the highest levels of both resilience and resistance. These findings contribute significantly to our understanding of the regional vegetation stability in the Loess Plateau under the background of climate changes, thereby guiding the ecological restoration and management efforts in the region.
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