Convergence of daily light use efficiency in irrigated and rainfed C3 and C4 crops
2018
Gitelson, Anatoly A. | Arkebauer, Timothy J. | Suyker, Andrew E.
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.
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