科研之友
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摘要
A novel measurement technique was developed to remotely sense transpirational water use efficiency (WUET). Maize (Zea mays) crop was grown under three water regimes of 0.75, 1.00, and 1.25 times of water surface evaporation (Ep). WUET was evaluated and compared with leaf reflectance. Our data showed that drought stress significantly decreased leaf area, leaf water content and WUET. Leaf reflectance near the red edge spectrum varied with water regimes and growth stages. Importantly, WUET was negatively correlated (P < 0.01) with reflectance near the 760-nm. At the V9 and V12 stages and compared with those of well irrigated treatments, the first derivative reflectance peak of 0.75 Ep was left-shifted to shorter wavelengths. Our study provides an experimental evidence for the red edge - WUET relationship, and suggests that reflectance at the 760-nm could be used as a rapid and instant physiological tool to quantitatively assess WUET at the leaf level.
