J. Jpn. Soc. Soil Phys.
*+pNo. +*., p. 31+*2 ,**0  *Lectures on Features of Peatland and Mire Vegetation
Hiroko FUJITA** Botanic Garden, Field Science Center for Northern Biosphere, Hokkaido University,
Kita--, Nishi-2, Chuo-ku, Sapporo *0*ῌ***-, JapanyP*L6

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Fig. +

Relationship between elevation and warmthindex for mires in Hokkaido (Tachibana, +331).
Mountain mires : + Nisekoannupuri, , Kagaminuma, - Shinsen-numa, . Ohyachi, / Pankemekunnai, 0 Chisenupuri, 1 Kyougoku, 2 Nakayama, 3 Orochigahara, +* Uryu-numa, ++ Nakaminenotaira, +, Matsuyama, +- Piyashiri, +. Ukishima, +/ Tenninkyo-Hyoutann-uma, +0 Gennshigahara, +1 Tenninngahara, +2 Numanotaira, +3
Numanohara, ,* Hiragadake, ,+ Chubetsu-numa,,, Rausuko, ,- Shiretoko-numa, ,. Futatsuike.
Lowland mires : ,/ Shizukari, ,0 Utasai, ,1
Sarobetsu, ,2 Mokeuni-numa, ,3 Asagino, -*Sarukotsu-numa, -+ Shibetsu, -, Furengawa,-- Nishibetsu, -. Hashirikotan, -/ Cape Ochi-   +*. ¼ ,**0

ishi, -0 Yururitou, -1 Bekanbeushi, -2 Kiritappu, -3
Kushiro, .* Tokachi-Kaigan, .+ Yuhfutsu.

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Ground water level and distribution of plant communities at a cross-section of
Bekanbeushi Mire (Inoue, +331 ; Sato et al., ,**,).
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Fluctuation of ground water level and river level at Bekanbeushi Mire (Inoue, +331).
A : Toraibetsu River, B : Alder forest (rich fen), C : water level of the small stream
on the fen zone, D : Myrica gale var. tomentosa-Carex lasiocarpa var. occultans
community (poor fen), E : Ledum palustre ssp. diversipilosumSphagnum fuscum
community (bog), F : Alder forest near the hill side (rich fen). See Fig. ,.

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Relationship between the leaf area index (LAI) of Sasa palmata and ground waterlevel at Sarobetsu Mire.
The ground water level indicates the depth of water table from the ground surface.

 :  Yῌῌ/fg ,*** h +, ijC ,**, h - ik - l0Am"^
up'b^v wxy0)" z{|ῌ}~ ,**/9%
Fig. /

103

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Ground water level ﬂuctuations and precipitation at three points in
Shinoro Mire from December ,*** to March ,**,.
Missing data is due to instrument problem. (Fujita and Inoue, ,**/)

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stuq+ rstuῌvwxyq+©="# l(*  ª«¬-.8]" >­ *ῌ*./ mµ ! ^ A¶4@·!" !"#/-  & +32- 8]¸  ?¹º»8Z!

,**+ z l(*rstuῌvwxyq+'()*+vwxy6q+85:"@ * "28@8A %#Fig. 0Ground water level ﬂuctuations at a Moliniopsis japonica-Sphagnum community
in Shinoro Mire and a Sphagnum bog in Sarobetsu Mire.
Elavation of water table is converted into water depth from the ground surface.

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105

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Fig. 1

67¥C 5 "\]()*'¦f]`a5()5qr $῍%   $῍% 5EP
f + ῌ x yz $uX +3/2%§ ()5+|} $% &' 69 f 5~+*() +* |}() 1 " $uX +3/2%" B : l `a
!5KL7^ *5()¨+ $©ª«¬ῌ­®¯°±²"% ; C & D : bbKL7M
N9*5()¨+ $¬ª³´ῌ©ª«¬" ¬ª³´ῌ©ª«¬ῌµª¶·g"% ; 5 : ¸&MNcd7e"§ $XYῌZ[ GHI'¹º%"Relationship between natural water content (ῌ) and ignition loss (ῌ) of peat in Ishikari
Peatlands and Shizukari Mire.
Factor ‘f’ indicated the ratio of natural water content to the ignition loss of peat. As
natural water content of peat defers by its compression history, the ‘f’ value of virgin peat
is about +* whereas compressed peat may have value of around 1 (Miyagawa, +3/2). B :Moliniopsis japonica-Sphagnum papillosum community ; C & D : Rhus trichocarpa-Moliniopsis
japonica community, Rhus trichocarpa-Moliniopsis japonica and Sasa palmata community ;Others : communities with greater retrogressive succession (from Kawabata and Kamiya,unpublished data).

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Fig. 2 Relationship between natural water content (ῌ) and consolidation yield stress (kN/m,)of peat in Ishikari Peatlands and Shizukari Mire.
B : Moliniopsis japonica-Sphagnum papillosum community ; C & D : Rhus trichocarpaMoliniopsis japonica community, Rhus trichocarpa-Moliniopsis japonica and Sasa
palmata community ; Others : communities with greater retrogressive succession(from Kawabata and Kamiya, unpublished data).

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Univ., Sec. ,, +, : .,+῎/+-.

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