Table 1.
Leaf and Stem water sampling stations of the MIBA network used to calculate isotopic enrichment of leaf water in Figure 3.
Table 2.
Linear regression parameters between oxygen isotope ratios of seedling cellulose and culture water.
Figure 1.
Average biochemical oxygen isotopic fractionation (εbio±S.E.M., n = 5) in ‰ units for cellulose synthesized heterotrophically in wheat seedlings versus temperature (°C).
Figure 2.
Aquatic Δcell versus temperature.
Cellulose isotopic enrichment relative to source water (‰ units) for aquatic plants grown submerged from various studies [13], [18], [19]. Information for each data point is provided in the supplement (Table 2). Bold line is the best fit polynomial regression while the stippled line is for the best fit from wheat seedling experiment (Figure 1).
Figure 3.
Δleaf versus mean annual temperature.
Oxygen isotopic enrichment of leaf water relative to source water based on three types of calculations as described in the text: (•) based on a constant εbio of 27‰; (○) based on a temperature sensitive εbio adjusted to M.A.T.; (•) based on actual leaf water and stem water measurements. The relationship between Δleaf and M.A.T. was only significant with Δleaf calculated with a constant εbio.