Cavitation vulnerability index
nounPronunciation: /ˌkævɪˈteɪʃən vʌlnərəˈbɪlɪti ˈɪndɛks/
A quantitative measure of a plant's susceptibility to xylem embolism formation under water stress, determined by measuring the water potential at which 50% of hydraulic conductivity is lost (P50). This index predicts drought tolerance capacity and is species-specific.
Plain English
A numerical rating showing how easily a plant's water-conducting vessels lose function during drought.
Etymology & History
Usage
"Species with high cavitation vulnerability indices are typically restricted to water-rich habitats."
Style guide notes: Always report P50 values alongside index discussions to provide context for quantitative comparisons.
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Frequently Asked Questions
What does a lower cavitation vulnerability index indicate about a plant species?
Lower indices indicate greater resistance to xylem cavitation, suggesting better adaptation to drought-prone environments.
How is cavitation vulnerability index measured experimentally?
Through hydraulic conductivity measurements at progressively lower water potentials to determine P50 threshold.
Why Test Candidates on This?
Critical assessment tool in advanced plant ecology and drought physiology studies examining species distribution patterns.
Required skill level: Senior