森林立地学会誌 森林立地42(2),2000,57〜60
Jpn.J.For.Environment42(2),57−60 2000
Change in trunk water transport
area of heavily pruned Hinoki cypress,
Chamaecyparis
obtusa
Masafumi Ueda*, and Ei’ ichi Shibata**
*Nara Forest Resaearch Institute,
Takatori, Nara 635-0133, Japan and Graduate School of Bioagricultural Sciences,
Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
**Graduate School of Bioagricultural
Science, Nagoya University、
Chikusa-ku. Nagoya 464-8601, Japan
To investigate the effects of
pruning on water transport in a trunk cross section. we injected dye solution (
l% aqueous acid-fuchsin ) into a heavily pruned and a control tree. The sapwood
in contact with pruning wounds was not dyed by the dye ascent, suggesting that
pruning causes an embolism in sapwood and local blocking of xylem-sap ascent.
This blocking extended along the length for nine times the length of the
pruning wound.
Key words: Chamaecyparis obtusa, pruning, sapwood,
water conduction
上田正文・柴田叡弌:強度に枝打ちされたヒノキ樹幹内の通水面積の変化
強度に枝打ちしたヒノキの樹幹に染色液(1%酸性フクシン)を注入し,樹幹内の通水面積の変化を調べた。枝打ち痕に接する辺材部は染色液に染色されず,枝打ちによって辺材の樹液流動が部分的に阻害されていることが示唆された。この通水阻害部分は枝打ち痕の長さの9倍にまで垂直に拡がっていた。