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Corn Response toClimate StressDetected withSatellite-Based NDVITime Series Ruoyu WangKeith A. CherkauerL. C. Bowling2016 год

Corn Response to Climate Stress Detected with Satellite-Based NDVI Time Series
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: Corn growth conditions and yield are closely dependent on climate variability. Leaf growth, measured as the leaf area index, can be used to identify changes in crop growth in response to climate stress. This research was conducted to capture patterns of spatial and temporal corn leaf growth under climate stress for the St. Joseph River watershed, in northeastern Indiana. Leaf growth is represented by the Normalized Difference Vegetative Index (NDVI) retrieved from multiple years (2000–2010) of Landsat 5 TM images. By comparing NDVI values for individual image dates with the derived normal curve, the response of crop growth to environmental factors is quantified as NDVI residuals. Regression analysis revealed a significant relationship between yield and NDVI residual during the pre-silking period, indicating that NDVI residuals reflect crop stress in the early growing period that impacts yield. Both the mean NDVI residuals and the percentage of image pixels where corn was under stress (risky pixel rate) are significantly correlated with water stress. Dry weather is prone to hamper potential crop growth, with stress affecting most of the observed corn pixels in the area. Oversupply of rainfall at the end of the growing season was not found to have a measurable effect on crop growth, while above normal precipitation earlier in the growing season reduces the risk of yield loss at the watershed scale. The spatial extent of stress is much lower when precipitation is above normal than under dry conditions, masking the impact of small areas of yield loss at the watershed scale.
Год издания: 2016
Авторы: Ruoyu Wang, Keith A. Cherkauer, L. C. Bowling
Издательство: Multidisciplinary Digital Publishing Institute
Источник: Remote Sensing
Ключевые слова: Remote Sensing in Agriculture, Leaf Properties and Growth Measurement, Urban Heat Island Mitigation
Другие ссылки: Remote Sensing (PDF)
Remote Sensing (HTML)
DOAJ (DOAJ: Directory of Open Access Journals) (HTML)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (HTML)