Long-term effects of water stress on hyperspectral remote sensing indicators in young radiata pine

•Hyperspectral imagery was used to identify long-term water stress in radiata pine.•Water stress defined by equivalent water thickness (EWT), leaf fresh weight (LWCF)•Substantial changes in EWT, LWCF occurred 108 days after drought treatment started.•Strong correlations found between hyperspectral w...

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Bibliographic Details
Published in:Forest ecology and management 2021-12, Vol.502, p.119707, Article 119707
Main Authors: Watt, Michael S., Leonardo, Ellen Mae C., Estarija, Honey Jane C., Massam, Peter, de Silva, Dilshan, O'Neill, Renelle, Lane, David, McDougal, Rebecca, Buddenbaum, Henning, Zarco-Tejada, Pablo J.
Format: Article
Language:English
Subjects:
Drought
Hyperspectral
Multi-temporal
Needle reflectance
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Summary:•Hyperspectral imagery was used to identify long-term water stress in radiata pine.•Water stress defined by equivalent water thickness (EWT), leaf fresh weight (LWCF)•Substantial changes in EWT, LWCF occurred 108 days after drought treatment started.•Strong correlations found between hyperspectral water indices and both EWT, LWCF.•Relationships were stronger for water indices than chlorophyll, structure indices. The development of methods to spatially describe long-term water stress in plantations is going to become increasingly important as drought events increase in frequency under climate change. Despite this we are unaware of any research that has used hyperspectral imagery to describe long-term water stress for the most widely established exotic pine species, Pinus radiata D. Don (radiata pine). Hyperspectral imagery and foliage water content were repeatedly sampled over a five month period in one-year old radiata pine that were allocated to well-watered and drought treatments. These data were used to (i) determine how rapidly equivalent water thickness (EWT) and leaf fresh weight (LWCF) change in response to drought and (ii) identify the key hyperspectral indicators associated with changes in EWT and LWCF. Both EWT and LWCF exhibited little treatment variation until 91 days after treatment (DAT) but diverged strongly after this time. By 108 DAT, mean values in the control exceeded the droughted treatment by 41.3% for EWT (0.0175 vs. 0.0124 g cm−2, P 
ISSN:0378-1127
1872-7042
DOI:10.1016/j.foreco.2021.119707