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基金项目:国家重点研发计划项目（2022YFD2300202）;国家自然科学基金项目(41905100,42305207)；中国气象局·河南省农业气象保障与应用技术重点开放实验室开放基金项目（AMF202403）;安徽省自然科学基金项目(2108085QD157，1908085QD171)；中国气象局创新发展专项（CXFZ2023J060）

作者	单位
王超，李萌，褚荣浩，商东耀，成林，薛昌颖	（1.安徽农业大学资源与环境学院，安徽合肥 230036；2.郑州航空工业管理学院民航学院，河南郑州 450046；3.中国气象局·河南省农业气象保障与应用技术重点开放实验室，河南郑州，450003；4.河南省气象科学研究所，河南郑州 450003）

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中文摘要:

为探究高温干旱复合胁迫下叶片和冠层尺度日光诱导叶绿素荧光（solar-induced chlorophyll fluorescence，SIF）与植物光合作用的关系，开展冬小麦高温干旱复合胁迫田间试验，共设置三种水分条件\[严重干旱（50%~60%田间持水量）、轻度干旱（65%~75%田间持水量）和正常供水对照组（80%~90%田间持水量）\]和三个温度水平（半包式增温、全包式增温和大田环境温度对照组），分析不同胁迫处理下冠层和叶片尺度SIF、冠层总初级生产力（gross primary productivity，GPP）和叶片净光合速率（net photosynthetic rate，P_n）的日变化和季节变化特征，探讨小麦叶片SIF与P_n和冠层SIF与GPP之间的关联性。结果表明，高温干旱复合胁迫下日尺度和季节尺度叶片和冠层SIF总体均呈现出单峰型变化特征，季节尺度冠层SIF对干旱胁迫的响应比叶片SIF明显，且高温干旱复合胁迫对叶片和冠层SIF的影响均大于单一高温或干旱胁迫。P_n和GPP总体分别呈现出双峰型和单峰型变化特征。高温干旱复合胁迫下叶片SIF与P_n的相关性（R²=0.42）小于冠层SIF与GPP的相关性（R²=0.52），随着单一胁迫的增强，二者之间的相关性逐渐降低，且干旱胁迫对二者关系以及P_n和GPP的影响均大于高温胁迫。此外，环境变量中温度对SIF与P_n关系的影响最大，其次是饱和水汽压差（vapor pressure deficit，VPD），光合有效辐射（photosynthetic active radiation，PAR）影响最小，且SIF与P_n之间的相关性随温度的增加逐渐降低，随VPD的增大先降后升，随PAR的增加先升后降。高温干旱复合胁迫下冠层和叶片SIF大小与植物光合作用强弱有一定关联性，并受环境变量影响。

英文摘要:

To explore the relationship between solar-induced chlorophyll fluorescence (SIF) and plant photosynthesis under combined heat and drought stress at canopy and leaf scales, a field experiment of winter wheat under combined heat and drought stress was conducted. Three water treatments ［including severe drought (50%-60% field capacity), mild drought (65%-75% field capacity), and normal water supply control group(80%-90% field capacity)］ and three temperature treatments (including half pack warming, full pack warming, and normal field ambient temperature control group) were set up. The leaf and canopy scale radiance spectra and photosynthetic indices were obtained under stress treatment, and then canopy and leaf scale SIF, canopy gross primary productivity (GPP), and leaf net photosynthetic rate (P_n) were calculated. The characteristics of diurnal variation and seasonal variation of the above parameters were analyzed. The correlation between leaf SIF and P_n, and canopy SIF and GPP under different stress treatments and different environmental conditions were investigated. The results revealed that leaf and canopy SIF showed unimodal variation characteristics at both daily and seasonal scales under combined heat and drought stress. Compared with diurnal variation characteristics, the response of canopy SIF to drought stress at seasonal scale was more obvious than that of leaf SIF, and the influence of combined heat and drought stress on leaf and canopy SIF were greater than that of individual heat or drought stress. P_n and GPP showed bimodal and unimodal variations, respectively. The correlation between leaf SIF and P_n (R²=0.42) was smaller than that of canopy SIF and GPP (R²=0.52) under heat and drought combined stress. With the enhancement of individual stress, the correlation between leaf SIF and P_n and that between canopy SIF and GPP gradually decreased, and the impacts of drought stress on the relationship between leaf SIF and P_n and canopy SIF and GPP as well as P_n and GPP was greater than that of heat stress. In addition, the effects of three environmental variables (namely temperature (Tem), vapor pressure deficit (VPD), and photosynthetic active radiation (PAR) on the SIF and P_n relationship ranked as Tem>VPD>PAR, and the correlation between SIF and P_n gradually decreased with the increased Tem, decreased then increased with increasing VPD, and increased then decreased with increasing PAR. Under the combined stress of heat and drought, canopy and leaf scale SIF have a certain correlation with the intensity of plant photosynthesis, and environmental variables can affect this correlation.

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