Effects of simulated drought stress on the fine roots of Japanese cedar (<Emphasis Type="Italic">Cryptomeria japonica</Emphasis>) in a plantation forest on the Kanto Plain,eastern Japan |
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Authors: | Bohdan Konôpka Kyotaro Noguchi Tadashi Sakata Masamichi Takahashi Zuzana Konôpková |
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Institution: | (1) Department of Forest Protection and Game Management, National Forest Centre – Forest Research Institute Zvolen, Zvolen, Slovakia;(2) Nutrient Dynamics Laboratory, Department of Forest Site Environment, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba 305-8687, Japan |
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Abstract: | Drought stress was simulated in a 28-year-old Japanese cedar plantation (Kanto Plain, Japan) between April and October 2004
by removing throughfall using rain shelters. Changes in fine-root parameters caused by this drought treatment were examined
by sequential soil coring. Drought effects on fine roots were analyzed separately for particular soil depths (0–5, 5–15, and
15–25 cm) and root diameters (<1 and 1–2 mm). Generally, fine-root biomass and root tip numbers decreased by the drought treatment.
Drought stress was most intense for fine roots in the topsoil and weakest for fine roots in the deepest soil layer. Fine roots
less than 1 mm in diameter were affected more severely than 1- to 2-mm roots. The effect of drought treatment was most remarkable
for the number of white root tips, which decreased to 17% of the control at the soil depth of 0–5 cm. These results suggest
that white root tip is the most suitable indicator of drought stress. Simulated drought reduced production of fine roots less
than 1 mm and 1–2 mm in diameter. Fine-root mortality was stimulated for roots less than 1 mm, but not for 1- to 2-mm roots.
These results suggest that fine roots with larger diameters can survive drought stress at a level simulated in this study,
but processes of fine-root production were inhibited regardless of the diameter classes. The duration of drought stress and
phenology of fine roots should also be considered in diagnosing the effects of drought on fine-root parameters. |
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Keywords: | Drought Fine-root mass Mortality Production Root tips |
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