Figure 6
From: Origin and hydrodynamics of xylem sap in tree stems, and relationship to root uptake of soil water
Distribution of the 137Cs concentration ratio (C/C0) in the xylem stem of a sugi tree estimated by using the simple one-dimensional advective diffusion transport model37. (a) Constant magnitude of diffusion coefficients of 137Cs [1.66E−3 m2 year−1 (= 5.26 × 10–11 m2 s−1)], and (b) magnitude of diffusion coefficients changed in the intermediate wood zone (change from 1.66E−3 m2 year−1 to 7.76E−5 m2 year−1 (= 2.46 × 10–12 m2 s−1) after 0.045 m). Note: The 137Cs migration velocity is 0.0075 m year−1 in xylem stems. The radioactivity was corrected by using the radioactive decay constant λ = 0.023 year−1. x = 0 is the top of the second tree ring removed the outer and inner bark, phloem, cambium, and the first tree ring.
