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  

Detection of drought effects on photosynthetic stability of vegetation on the Loess Plateau based on solar-induced chlorophyll fluorescence

作　　者：刘柯言 韩璐 宋午椰 张初蕊 胡旭 许行 陈立欣[1,2] LIU Ke-Yan;HAN Lu;SONG Wu-Ye;ZHANG Chu-Rui;HU Xu;XU Hang;CHEN Li-Xin(College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;National Field Scientific Observation and Research Station of Forest Ecosystem in Jixian County,Linfen,Shanxi 042200,China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]山西吉县森林生态系统国家野外科学观测研究站,山西临汾042200

出　　处：《植物生态学报》2025年第3期415-431,共17页Chinese Journal of Plant Ecology

基　　金：国家重点研发计划(2022YFF1302501)。

摘　　要：黄土高原是我国气象干旱最频发的地区之一,近年来,在气候变暖的背景下,气象干旱有增加的趋势,探索植被光合生理活动对干旱的抵抗力和复原力对了解植被生长对环境变化的响应以及预测未来该地区植被变化具有重要意义。该研究利用日光诱导叶绿素荧光基于OCO-2的SIF数据集(GOSIF)产品、气温及标准化降水蒸散发指数(SPEI)数据,使用多元线性自回归模型,分析干旱对黄土高原各气候分区植被和不同植被覆盖类型光合作用时空稳定性的影响。结果表明:黄土高原植被的光合复原力与干旱程度之间呈线性关系,造成植被光合复原力逐渐减弱的干旱序列依次为轻度干旱>中度干旱>重度干旱。植被光合对干旱的抵抗力与干旱程度的关系呈非线性关系,抵抗力由强到弱的干旱序列依次为重度干旱>轻度干旱>中度干旱。黄土高原植被光合对温度变化不敏感。对比不同气候分区植被发现,干旱气候区植被的光合复原力随着干旱程度增强而降低,半干旱气候区植被光合复原力较为稳定,半湿润区植被光合复原力随重度、轻度和中度干旱依次降低。在各植被类型中,森林的光合作用的复原力和抵抗力最高。该研究结果有助于整体认识气候变化背景下黄土高原区植被稳定性的区域性特点,从而为黄土高原生态修复与治理提供科学依据。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 understa

关 键 词：日光诱导叶绿素荧光 植被光合 黄土高原 干旱 复原力 抵抗力 

分 类 号：Q948[生物学—植物学]