authority: folia
slug: light-use-efficiency
name: Light Use Efficiency
domain: land
subdomain: biosphere
authority_id: folia:light-use-efficiency
external_ids:
  nvs_uri: null
  cf_standard_name: null
description: |
  Efficiency with which absorbed photosynthetically active radiation (APAR)
  is converted into fixed carbon by vegetation. Down-regulated under stress
  (heat, drought, nutrient limitation) via the xanthophyll cycle, detectable
  in narrow-band reflectance around 531 nm. Used in light-use-efficiency
  models (e.g. MOD17 GPP) and observable proxies like PRI.
theme: vegetation
match_tags: [lue, gpp, photosynthesis, xanthophyll, pri]
status: documented