森林立地学会誌 森林立地43（2），2001，53〜58
Jpn.J.For.Environment 43（2），53−58 2001
南九州地方におけるコジイ林およびスギ林の酸中和能の比較
高木正博＊・野上寛五郎＊
＊宮崎大学農学部
宮崎大学農学部附属田野演習林内のコジイ林とスギ林において林外雨，林内雨，樹幹流及びA0層通過水を3年間採取し，それらのイオン濃度を分析した。林分全体の酸中和能，すなわちA0層通過後の年平均水素イオンフラックスはコジイ林とスギ林で違いがなかった。しかし中和反応が主に行われた過程は異なり，コジイ林では樹体であり，スギ林ではA0層であった。A0層で酸が消費された原因として，マグネシウムイオンおよびカルシウムイオンとの交換反応が示唆された。特にスギ林のA0層の高い酸中和能はリターに多く含まれていたカルシウムによってもたらされていたものと考えられた。
Masahiro Takagi and Kangoro Nogami : Neutralization
capacity of hydrogen ion in Castanopsis
cuspidata and Cryptomeria japonica
stands in Southern Kyushu
The ion flux of rainfall, throughfall,
stemflow and percolate from A0 horizon were investigated for three years at a Castanopsis cuspidata stand and a Cryptomeria japonica stand in the
Miyazaki University Forests. Neutralization capacities of hydrogen ion throgh
the Castanopsis cuspidata stand were
not distinctly different from that of the Cryptomeria
japonica stand. The annual average of hydrogen ion flux of the percolate
from A0 horizon
in both stands were equal. However, the process that hydrogen ion was
neutralized was different between the stands. In the Castanopsis cuspidata stand, canopy and stem were the main sink of
hydrogen ion. In contrast, in the Cryptomeria
japonica stand, A0
horizon neutralized hydrogen ion in rainfall and that produced on canopy and
stem. Exchange reactions with magnesium ion and calcium ion was the major
hydrogen ion sink of the A0 horizon of both stands. In the Crytomeria japonica stand, most of the
hydrogen ion would be exchanged for calcium ion leached from litter.