The Relationship of Winter Wheat Photosynthetic Rate and Vegetation Indices Under Different Water Conditions

doi:10.11924/j.issn.1000-6850.casb18070028

Abstract

Abstract: To effectively and rapidly diagnose the potential productivity of wheat under different water conditions, water stress experiment of winter wheat was conducted in canopy. By studying the photosynthetic rate and vegetation index, the authors analyzed the changing characteristics of the photosynthetic rate, NDVI, EVI, RVI and PRI in the growth period, and the optimum model of photosynthetic rate and vegetation index was established. The results showed that water stress decreased vegetation indices from jointing stage to booting stage, but it did not influence Pn greatly. Both vegetation indices and Pn were sensitive to water stress from booting stage to flowering stage. However, Pn and vegetation indices decreased greatly (P<0.01) only under severe and heavy drought stress conditions [30%-65% field capacity (FC)], moderate drought and slight water logging (65%-105% FC) did not influence Pn obviously. Pn was best reflected by EVI under severe drought stress condition (Pn=2.0449EVI-1.2906, R=0.82, P<0.01) and heavy drought stress condition (Pn=1.7742EVI- 1.7021, R=0.79, P<0.01) but PRI was the best indicator of Pn (Pn=47.283PRI +10.887, R=0.38) under the moderate drought stress condition. Pn was closely related to NDVI with Pn=37.982NDVI3.0101 (R=0.51, P<0.01) for unstressed condition and with Pn=28.024NDVI2.5646 (R=0.47, P<0.05) for slight water logging condition. The optimum models of Pn with different vegetation indices could be used as an indicator to evaluate photosynthetic of regional winter wheat under different water conditions, further for product prediction.

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