A Prelimi Ry Study of Revegetation of Disturbed Area From Forest Seedbanks

27 Mar A Prelimi Ry Study of Revegetation of Disturbed Area From Forest Seedbanks

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Abstract

大阪府阪南市の約10年生ヒノキ植林地から採取した森林表土を, 潅水及び無潅水処理を施した粘質土壌基盤に, 異なる表土厚, 活性炭混入, わらマルチング, コバノミツバツツジ追加播種の各処理を行い, 全発芽個体の消長, 高さ・葉張りを追跡調査した。1996年7～12月に潅水処理区全体から播種種コバノミツバツツジ (852個体) 以外に58種1372個体, 無潅水区からは37種658個体が発芽し, ヤマグワなど23種は灌水区のみから発芽した。植物被覆量は灌水区表土5cm区で最大, 1cm区で小さかったが, 無潅水区では潅水各区に匹敵した活性炭混入区以外の区では非常に小さかった。森林表土播きだしによる植生回復に対し潅水処理, 活性炭混入の有効性が確認できた。

English Abstract

For the purpose of obtaining a prelimi ry knowledge for the recovery of disturbed area with endemic plant species stored in a forest seed-bank, a 3-5cm layer of the topsoil collected from a young Chamaecyparis obtusa forest was applied with different levels of thickness on an experimental plot made of heavy clay soil of a Osaka group. The live-and-die and the growth of every emerged plants under watered and non-watered conditions were investigated in 1996. Several experimental treatments such as mixing of charcoal particles, mulching with rice straws, or additio l seeding of Rhododendron reticulata seeds were also applied. The 2225 plants of 59 species, including 852 seedlings of seeded Rhododendron, emerged from watered plots, while 658 plants of 37 species from non-watered plots. The total estimated coverage was maximum in 5cm plot of watered condition, while the coverage of all plots in non-watered condition was very small with an exception of charcoal mixed condition in which the coverage matched to those of watered conditioned plots. Watering or mixing of charcoal with forest topsoil seemed very useful for the germi tion of buried seeds andlater growth.