Convergence of daily light use efficiency in irrigated and rainfed C3 and C4 crops

Anatoly A. Gitelson, Timothy J. Arkebauer, Andrew E. Suyker

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The goal of this study is to quantify variability of daily light use efficiency (LUE) based on radiation absorbed by photosynthetically active vegetation (LUEgreen) in C3 and C4 crops. Data contained GPP, fAPAR, total and green leaf area index taken over 16 site years of irrigated and rainfed maize and 8 site years of soybean in 2001–2008 including years with quite strong drought events. LUEgreen in irrigated and rainfed sites were statistically indistinguishable showing low sensitivity to water availability. Seasonal changes of LUEgreen remained remarkably small over a wide range of water supply, leaf area index and weather conditions. The magnitude and composition of incident radiation affected the magnitude of the day-to-day LUEgreen change – increases in incident PAR caused statistically significant decreases of LUEgreen. Convergence of LUEgreen to a narrow range in irrigated and rainfed crops brought important implications for understanding mechanisms of plant response to stress and remote estimation of primary production in crops.

Original languageEnglish (US)
Pages (from-to)30-37
Number of pages8
JournalRemote Sensing of Environment
Volume217
DOIs
StatePublished - Nov 2018
Externally publishedYes

Keywords

  • Incident radiation
  • Light use efficiency
  • Primary production

ASJC Scopus subject areas

  • Soil Science
  • Geology
  • Computers in Earth Sciences

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