Drought Sensitivity of the Carbon Isotope Composition of Leaf Dark-Respired CO₂ in C₃ (<i>Leymus chinensis</i>) and C₄ (<i>Chloris virgata</i> and <i>Hemarthria altissima</i>) Grasses in Northeast China.

Changes in the concentrations of soluble sugars and transitory starch Leaf soluble sugars showed a trend of decreasing from 21:00 to 03:00 h in all studied species; however, the range of nighttime variations in soluble sugars content (maximum value – minimum value) in the C 4 grasses was greater than that in the C 3 grass (Figures 4A–C ).

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Conclusions For the studied C 3 and C 4 grasses, δ 13 C l showed a decreasing trend from 21:00 to 03:00 h.

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