Application of activable tracers to investigate radial movement of minerals in the stem of Japanese cedar (Cryptomeria japonica)

Okada, Naoki; Hirakawa, Yasuhiko; Katayama, Yukio

doi:10.1007/s10086-011-1188-8

Cited by 21 publications

(17 citation statements)

References 17 publications

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“…The radial distribution of Rb in the stem at 204 days after the injection at the beginning of September (our previous study [4]) is very similar to that in the present study at 172 days after the injection in mid May. This means injected Rb is transferred from the sapwood to the heartwood and then diffuses in the heartwood in both the resting and growing periods.…”

Section: Discussionsupporting

confidence: 89%

“…Rubidium content ranged from 2.1 to 3.5 ppm in the sapwood and from 5.4 to 6.2 ppm in the heartwood of the two trees. The Rb content in the heartwood was as similar as those reported for Japanese cedar [10,11], and the background in our previous report [4]. Potassium contents in the two trees were much higher than those of Rb, but their distribution patterns, increasing from outer to inner sapwood and almost constant in heartwood region, were very similar to the Rb's.…”

Section: Heartwood Moisture and Background Rb Content In Kumotooshisupporting

confidence: 82%

“…Potassium contents in the two trees were much higher than those of Rb, but their distribution patterns, increasing from outer to inner sapwood and almost constant in heartwood region, were very similar to the Rb's. The value of Rb/K was, accordingly, rather constant especially in the heartwood, and the range (0.0022-0.0027) was lower than the background in our previous report [4]. We, therefore, judged that the Rb content in the wood of the opposite side was not influenced by Rb injection.…”

Section: Heartwood Moisture and Background Rb Content In Kumotooshimentioning

confidence: 77%

“…In our previous study [4], we traced the movement of sapwood-injected Rb and Eu in Japanese cedar in the resting period for up to 204 days. The results indicated that Rb injected in the sapwood was detected in the heartwood at 40 days after the treatment, whereas Eu was not.…”

Section: Introductionmentioning

confidence: 99%

“…Instead, non-radioactive tracers, such as stable isotopes and activable tracers, are being the alternative. In the previous study [4], we applied activable tracers (Rb and Eu) to investigate mineral movement in Japanese cedar (Cryptomeria japonica) stems, especially movement between sapwood and heartwood. Present study is a further approach using rubidium (Rb) as an activable tracer.…”

Section: Introductionmentioning

confidence: 99%

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Radial movement of sapwood-injected rubidium into heartwood of Japanese cedar (Cryptomeria japonica) in the growing period

2011

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Rubidium solution was injected in the sapwood of a Japanese cedar cultivar in the growing period, and its radial movement in stem was traced to investigate the accumulation of alkali metals in the heartwood. Sapwoodinjected Rb was detected in outer heartwood at 10 days after the treatment, and continued increasing at 20 days after. Radial movement of Rb toward heartwood was considered to occur soon after the treatment, and to decline at a certain point of the time after Rb injection ceased. However, Rb continued moving in heartwood probably by diffusion even after the cease of Rb injection. In a series of injection experiment, radial movement of injected Rb is not corresponding to the seasonality of both cambial activity and cytological changes of ray parenchyma accompanied with heartwood formation. From the results on Rb's behavior, we conclude that accumulation of K and other alkali metals in heartwood of Japanese cedar has two steps, active transport from sapwood to outer heartwood via ray, and diffusion in heartwood, and that these processes proceed independently from both cambial activity and cytological changes of ray parenchyma.

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Section: Discussionsupporting

confidence: 89%

Section: Heartwood Moisture and Background Rb Content In Kumotooshisupporting

confidence: 82%

Section: Heartwood Moisture and Background Rb Content In Kumotooshimentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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