Assessing the potential of red solar-induced chlorophyll fluorescence for drought monitoring in different growth stages of winter wheat

Litao Zhou; Jingyu Lin; Jianjun Wu; Ruohua Du; Meng Chen; Bingyu Zhao; Rui Yang

Ecological Indicators (Apr 2024)

Assessing the potential of red solar-induced chlorophyll fluorescence for drought monitoring in different growth stages of winter wheat

Litao Zhou,
Jingyu Lin,
Jianjun Wu,
Ruohua Du,
Meng Chen,
Bingyu Zhao,
Rui Yang

Affiliations

Litao Zhou: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Jingyu Lin: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Jianjun Wu: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China; Corresponding author at: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China.
Ruohua Du: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Meng Chen: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Bingyu Zhao: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
Rui Yang: Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China; State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

Journal volume & issue: Vol. 161
p. 111960

Abstract

Read online

Compared to traditional vegetation indices (VIs), Sun-induced chlorophyll fluorescence (SIF) has the advantage of rapid response to drought and early drought detection. However, the response of red SIF (SIF687) to drought at different growth stages of winter wheat remains unclear. Therefore, this study focuses on winter wheat and sets up three irrigation treatments with different drought intensities. Spectral data collected by an automated spectral observation system are used to retrieve SIF687, far-red SIF (SIF760), the Normalized Difference Vegetation Index (NDVI), the Near-Infrared Reflectance Index (NIRv), as well as meteorological data, soil moisture (SM), and vegetation growth parameters. The goal is to investigate the response of SIF687 to drought at different growth stages of winter wheat. The results indicated that SIF687 showed a positive response to drought, compared to the condition without drought, SIF687’ change rate (31.19% and 47.38%) exhibited a superior monitoring effect for moderate and severe drought than that of SIF760 (13.10% and 10.63%) and VIs (−4.84% and −4.02%), with the jointing stage showing the highest sensitivity to changes in SM. Under different scenarios, the effects of photosynthetically active radiation (PAR), vegetation physiology and canopy structure on SIF687 were different. With the increase of drought intensity and the development of growing season, the impact of PAR on SIF687 gradually decreased. The response of SIF687 to drought was more affected by physiological changes (chlorophyll content, Chl) than by vegetation structure changes (leaf area index, LAI). In summary, SIF687 possesses the potential for early drought monitoring in winter wheat. It can provide timely responses to water stress at different growth stages, thus contributing to the mitigation of agricultural drought risks.

Published in Ecological Indicators

ISSN: 1470-160X (Print); 1872-7034 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Biology (General): Ecology
Website: https://www.sciencedirect.com/journal/ecological-indicators

About the journal

Abstract

Keywords