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Estimation of vegetation water content using hyperspectral vegetation indices: a comparison of crop water indicators in response to water stress treatments for summer maize
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Estimation of vegetation water content using hyperspectral vegetation indices: a comparison of crop water indicators in response to water stress treatments for summer maize
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Journal Article
Estimation of vegetation water content using hyperspectral vegetation indices: a comparison of crop water indicators in response to water stress treatments for summer maize
2019
Overview
Background
Vegetation water content is one of the important biophysical features of vegetation health, and its remote estimation can be utilized to real-timely monitor vegetation water stress. Here, we compared the responses of canopy water content (CWC), leaf equivalent water thickness (EWT), and live fuel moisture content (LFMC) to different water treatments and their estimations using spectral vegetation indices (VIs) based on water stress experiments for summer maize during three consecutive growing seasons 2013–2015 in North Plain China.
Results
Results showed that CWC was sensitive to different water treatments and exhibited an obvious single-peak seasonal variation. EWT and LFMC were less sensitive to water variation and EWT stayed relatively stable while LFMC showed a decreasing trend. Among ten hyperspectral VIs, green chlorophyll index (CI
green
), red edge normalized ratio (NR
red edge
), and red-edge chlorophyll index (CI
red edge
) were the most sensitive VIs responding to water variation, and they were optimal VIs in the prediction of CWC and EWT.
Conclusions
Compared to EWT and LFMC, CWC obtained the best predictive power of crop water status using VIs. This study demonstrated that CWC was an optimal indicator to monitor maize water stress using optical hyperspectral remote sensing techniques.
Publisher
BioMed Central,BioMed Central Ltd,BMC
Subject
/ Analysis
/ Biomedical and Life Sciences
/ canopy
/ China
/ Corn
/ Drought
/ Ecology
/ Humans
/ Hyperspectral remote sensing
/ Landscape ecology and ecosystems
/ Leaf equivalent water thickness
/ leaves
/ Rain
/ Seasons
/ Studies
/ Summer
/ Water
/ Zea mays
