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.4.

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ü*# í$A¶÷ø;‹+,-£A,àBIUZ.ÆSÅ®/ÆS1ål;#>A;«¬x0/ y)"z{&89k9lmnm,>|}w~/gŠ”0Ï*.’‹U123bUDÞ4BCLIAõSgD5w•HI6÷7ähS·¸¹º;,àµ¶ƒ„;•ERŽ§If•‚;\^_`aÔ8á€;Rh©ªvmL;RSRõ€{9:ÈaÌˆBusA;±Ifi;ñ0#ÉHI;ŠS<=¶æRŽ§I%Ozawa et. al., 1992'f>?R<= 80ŒS&' 20ŒSŸHD@2ABC%qrDEFfG 424 H'AIJaKÜ€{-R
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.3.

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¯RhSZZW™h&'°¾S&',b•‚S•±²;Ê³;I.S•€^îR÷ø&àRä[-Rµ¶á€%http://ogb.go.jp/move/okip/pdf/case0101.pdf'fŸ;µ¶Rhƒ;æo÷"Š}õm½¾Am€f-w2_•€^aÔ´Œ•ØCLI`hSä[-aªDµ.I;RŽ€%§¨è'fŸHDuDSæo÷"ŠÀ—GHSƒ0;!Ah*šD•±If‡‹ñ0a¶É±S«¬GXhK‘BIZZW™•€^ 0.7 ha ‹CDÅ2`l4-·aµ.If`hS¸Œ{¸ŒS¹æBCLI
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!"#$%&Clim. Bios.' 9, 2009

Z2^ŠKLmƒ„aØÙD¯°GwI•uLŒSg; 15 =û;~•a¶É±IñNh…ç; 3¾RŽ€f1) ©ªáÚ€w;h\^_`ABCÛ½aLá€f2) AõDSEòÒhƒ„•EŒ•ÜHSƒ„hÝÞlmÓ¾R•EGH€ÕõRŽ€f3) ‡ˆ‰DhS*Ó;ßàS¹ú;ÔÕa¹D€ÕõRSŽÉD©ªvmvCwžôBáÕõ
RmLf

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.5.

!
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Hirota, T., Pomeroy J.W., Granger R.J., Maule C.P., 2002: An extension of the force-restore method toestimating soil temperature at depth and evaluation for frozen soils under snow. J. Geophys. Res., 107,
D24,4767, 10.1029/2001JD001280.
Hirota, T., Iwata, Y., Hayashi, M., Suzuki, S., Hamasaki, T., Sameshima, R. and Takayabu, I., 2006:
Decreasing soil-frost depth and its relation to climate change in Tokachi, Hokkaido, Japan. J. Meteorol.

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!"#$%&Clim. Bios.' 9, 2009

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