植栽密度の異なるスギ・ヒノキ造林地における下刈り方法の違い

᳜᱂ᐦᗘࡢ␗࡞ࡿࢫࢠ࣭ࣄࣀ࢟㐀ᯘᆅ࡟࠾ࡅࡿୗสࡾ᪉ἲࡢ㐪࠸
ࡀసᴗຌ⛬࡜᳜᱂ᮌࡢึᮇᡂ㛗㔞࡟ཬࡰࡍᙳ㡪
ఀ⸨ ឡ 1)㺃⥥㔝ዲ๎ 2)㺃⿙⏣ဴྖ 1)࣭ᒣᮏⱱᘯ 3)࣭㏆⸨ ᫭ 1)
1)㎰ᯘᢏ⾡◊✲ᡤ᳃ᯘ࣭ᯘᴗ◊✲ࢭࣥࢱ࣮2)⎔ቃᒁ⮬↛ಖㆤㄢ3)㎰ᯘ኱Ꮫᰯᯘᴗศᰯ
The Effects of Weeding Method and Planting Density of Japanese Cedar
(Cryptomeria Japonica) and Japanese Cypress (Chamaecyparis Obtusa)
on the Operational Efficiency of Weeding and Early Growth of Trees
Ai Ito1),Yoshinori Watano2),Tetuji Hakamata1),Shigehiro Yamamoto3)
and Akira Kondo1)
࣮࣮࢟࣡ࢻ㸸సᴗຌ⛬㸪ୗสࡾ㸪᳜᱂ᐦᗘ㸪ᡂ㛗㔞㸪ᆤสࡾ
Ϩ ⥴ ゝ
ᗘ㸪สᡶ࠸ࡢᑐ㇟࡜࡞ࡿ㞧ⲡᮌ࡞࡝ࡢせᅉ࡟ࡼࡗ
࡚ᕥྑࡉࢀࡿ࡜⪃࠼ࡽࢀ࡚࠸ࡿ 㸬௒ᅇࡢㄪᰝᆅࡣ㸪
㐀ᯘ࣭ಖ⫱࡟᥃࠿ࡿ⤒㈝ࡢ࠺ࡕ㸪᳜᱂࠿ࡽ 10 ᖺ
ᯘ㱋ཬࡧᩳᗘࡀఝ㏻ࡗࡓ ࡘࡢⓙఆᆅ࡛࠶ࡿࡓࡵ㸪
㛫࡟ᚲせ࡜࡞ࡿ⤒㈝ࡣ᭱ࡶ኱ࡁࡃ㸪඲యࡢ ๭ࢆ
ୖグせᅉࡢ࠺ࡕ㞧ⲡᮌࡢ᳜⏕ࡀࡑࢀࡒࢀࡢୗสࡾ
༨ࡵ࡚࠸ࡿ 㸬୺࡞ึᮇಖ⫱࡟ࡣᆅᣛ࠼㸪᳜᱂㸪ୗ
సᴗ࡟୚࠼ࡿᙳ㡪࡟ࡘ࠸࡚ࡶ᫂ࡽ࠿࡟ࡋࡓ㸬ࡉࡽ
สࡾࡀヱᙜࡍࡿࡀ㸪ࡑࡢ୰࡛ࡶ᳜᱂ᚋᩘᖺ㛫㸪ኟ
࡟㸪᳜᱂ᐦᗘཬࡧୗสࡾ᪉ἲࡢ㐪࠸ࡀୗสࡾᚋࡢ
Ꮨࢆ୰ᚰ࡟⾜ࢃࢀࡿୗสࡾࡣ㸪ከࡃࡢປാᢞୗ࡜
᳜᱂ᮌࡢᡂ㛗࡟୚࠼ࡿᙳ㡪࡟ࡘ࠸࡚ేࡏ࡚ㄪᰝࡋ
㈝⏝ࡀᚲせ࡞సᴗ࡛࠶ࡿ㸬ୗสࡾࡣ㸪᳜᱂ᮌ࡜㞧
ࡓ㸬
ⲡᮌ࡜ࡢ➇ྜ㛵ಀࢆ᤼㝖ࡋ㸪᳜᱂ᮌࡢᯤᦆࢆ㜵ࡂ㸪
ϩ ᮦ ᩱ ཬ ࡧ ᪉ ἲ
ᡂ㛗ࢆⰋዲ࡟ࡍࡿࡓࡵ⾜ࢃࢀࡿసᴗ࡛࠶ࡿ㸬ࡑࡢ
┬ຊ໬࡜ࡋ࡚㸪ࡇࢀࡲ࡛ୗสࡾࡢ┬␎㸪ୗสࡾ᫬
ᮇࡢኚ᭦࡟ࡼࡿປാ㈇ᢸ㍍ῶᗘࡢ◊✲࡞࡝ࡀ࡞ࡉ
ࢀ࡚ࡁࡓ
ヨ㦂ᆅࡣ㸪὾ᯇᕷኳ❳༊す⸨ᖹᆅෆᶆ㧗⣙ 250
㸬ୗสࡾࡑࡢࡶࡢࢆ┬␎໬ࡍࡿ᪉ἲ࡜
㹫࡟࠶ࡿ༡すྥࡁࡢⓙఆᆅ࡛࠶ࡿ㸬2010 ᖺ࡟㸪
ࡋ࡚ࡣ㸪㏻ᖖ⾜ࢃࢀࡿ඲สࡾࡼࡾࡶୗสࡾᙉᗘࡢ
ᩳ㠃ୖ㒊࡟ 3 ᖺ⏕ࣄࣀ࢟ⱑ㸪ୗ㒊࡟㸰ᖺ⏕ࢫࢠⱑ
ప࠸ᆤสࡾࡀ࠶ࡿ 㸬ᆤสࡾࡣ᳜᱂ᮌࡢ࿘㎶ࡢࡳࢆ
ࢆ㸪పᐦᗘ᳜᱂࡛࠶ࡿ 1000 ᮏ/ha㸪2000 ᮏha㸪
สࡿ᪉ἲ࡛㸪㠃✚ࢆ㝈ᐃⓗ࡟ࡍࡿࡇ࡜࡟ࡼࡾୗส
㏻ᖖࡢ᳜᱂ᐦᗘ࡛࠶ࡿ 3000 ᮏha ࡛᳜᱂ࡋ㸪ᶞ✀
ࡾࡢ┬␎ࢆᅗࡿ᪉ἲ࡛࠶ࡿ㸬ࡑࡢࡓࡵ㸪ᆤสࡾࢆ
࡜᳜᱂ᐦᗘࡢ␗࡞ࡿヨ㦂༊ࢆ 0.1ha ࡎࡘタࡅࡓᅗ
⾜࠺㠃✚ࡣ᳜᱂ᐦᗘ࡟኱ࡁࡃᙳ㡪ࢆཷࡅࡿ㸬୍᪉㸪
㸬2011 ᖺ࠿ࡽ 2013 ᖺ࡟࠿ࡅ࡚㸪ᶞ✀࣭᳜᱂ᐦ
཰┈ࢆୖࡆࡿࡓࡵ࡟పᐦᗘ᳜᱂ࡣ᭷ຠ࡛࠶ࡿࡇ࡜
ᗘࡈ࡜࡟ヨ㦂༊ࢆ஧ศࡋ㸪ୗⲡ඲㠃สࡾ༊㸦௨ୗ
࠿ࡽ 㸪཰┈ᛶࡀ㧗ࡃ㸪࠿ࡘ┬ຊⓗ࡞ᯘᴗࢆ⾜࠺ୖ
඲สࡾ༊㸧࡜᳜᱂ᮌ࿘ᅖࡢୗⲡࡢࡳ㒊ศสࡾ༊㸦௨
࡛ࡣ㸪పᐦᗘ᳜᱂ࡢ᮲௳ୗ࡛┬ຊⓗ࡞ୗสࡾ᪉ἲ
ୗᆤสࡾ༊㸧ࢆタᐃࡋ࡚ㄪᰝࢆ⾜ࡗࡓ㸬
ࢆ᳨ウࡋ࡚࠸ࡃᚲせࡀ࠶ࡿ㸬ࡋ࠿ࡋ㸪᳜᱂ᐦᗘ࡜
ୗสࡾ᪉ἲࢆ⤌ࡳྜࢃࡏࡓຌ⛬ㄪᰝࡣࡇࢀࡲ࡛ሗ
సᴗຌ⛬ㄪᰝ
࿌ࡀ࡞࠸㸬ࡑࡇ࡛㸪ᮏ◊✲࡛ࡣ㸪᳜᱂ᐦᗘཬࡧୗ
ୗสࡾࡣẖᖺ᳃ᯘ⤌ྜࡢసᴗဨ 3 ྡࡀ⾜ࡗ
สࡾ᪉ἲࡢ㐪࠸ࡀసᴗຌ⛬࡟ཬࡰࡍᙳ㡪ࢆẚ㍑ࡋ
ࡓ㸬ୗสࡾࢆ⾜࠺㝿㸪సᴗဨ 1 ྡ࡟ᑐࡋㄪᰝ
ࡓ㸬ࡲࡓ㸪ୗสࡾసᴗࡢ㞴ᗘࡣ㸪ᯘ㱋㸪ᯘᆅࡢᩳ
ဨ 1 ྡࡀ௜ࡁῧ࠸㸪ࠕୗสࡾࠖࠕ⛣ືࠖ࡟せࡋ
90
㟼ᒸ┴㎰ᯘᢏ⾡◊✲ᡤ◊✲ሗ࿌ ➨ 8 ྕ(2015)
________________________________________________________________________________
᳜᱂ᮌࡢᡂ㛗㔞ㄪᰝ
ୗสࡾࢆ⾜࠺๓ࡢ 2011 ᖺ 4 ᭶࡜ 2 ᖺ㛫ୗสࡾࢆ
඲
⾜ࡗࡓᚋࡢ 2013 ᖺ 4 ᭶࡟ࢫࢠࡢᶞ㧗࡜㸪ᆅ㝿㒊ࡢ
ᆤ
ୖ
ẁ
ࠉ
ࣄ
ࣀ
࢟
ୗ
ẁ
ࠉ
ࢫ
ࢠ
ᆤ
඲
඲
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ᆤ
඲
඲
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ᆤ
࢝ࣔࢩ࢝࡟ࡼࡿ㣗ᐖࡀከᩘⓎ⏕ࡋࡓࡓࡵ㸪ゎᯒ࠿
ࡽ㝖እࡋࡓ㸬
ᆤ
඲䠖඲ส䜚༊
ᆤ䠖ᆤส䜚༊
ᩳ⥺䠖䜺䜿
᳜᱂ᐦᗘ
ᮏKD
᰿ඖᚄࢆィ ࡋࡓ㸬࡞࠾㸪ࣄࣀ࢟ࡣࢽ࣍ࣥࢪ࣭࢝
᳜᱂ᐦᗘ
᳜᱂ᐦᗘ
ᮏKD ᮏKD
ᅗ 1 ㄪᰝᆅᴫせ
Ϫ ⤖ ᯝ
᳜᱂ᐦᗘ࡜ୗสࡾ᪉ἲࡢ㐪࠸ࡀసᴗຌ⛬
࡟ཬࡰࡍᙳ㡪
ᚓࡽࢀࡓసᴗຌ⛬ࡢ⤖ᯝࢆ⾲ 1 ࡟♧ࡍ㸬సᴗຌ
ࡓ᫬㛫ཬࡧసᴗࡋࡓ᳜᱂ᮌࡢᮏᩘࢆグ㘓ࡋࡓ㸬స
⛬ࡀ᭱ࡶඃࢀ࡚࠸ࡓࡢࡣ㸪ࣄࣀ࢟ࡢ 1000 ᮏ/ha ༊
ᴗࡋࡓ᳜᱂ᮌࡢᮏᩘ࠿ࡽసᴗ㠃✚ࢆィ⟬ࡋ㸪 ha
࡟࠾࠸࡚ 3 ᖺ┠ࡢᆤสࡾࢆ⾜ࡗࡓሙྜ࡛㸪11 ᫬㛫
࠶ࡓࡾࡢసᴗຌ⛬ࢆ⟬ฟࡋࡓ㸬࡞࠾㸪ୗสࡾࡣస
ha࣭ே࡛࠶ࡗࡓ㸬సᴗຌ⛬ࡀ᭱ࡶຎࡗ࡚࠸ࡓࡢࡣ㸪
ᴗ⤒㦂࡟ࡼࡿᕪࢆ⪃៖ࡋ㸪୍ᐃࡢ᫬㛫ࡈ࡜࡟ࡑࢀ
ࣄࣀ࢟ࡢ 2000 ᮏha ༊࡟࠾࠸࡚㸪1 ᖺ┠ࡢ඲สࡾ
ࡒࢀࡢㄪᰝ༊࡛సᴗဨࡢධࢀ᭰࠼ࢆ⾜ࡗࡓ㸬ࡲࡓ
ࢆ⾜ࡗࡓሙྜ࡛㸪⣙ 46 ᫬㛫/ha࣭ே࡛࠶ࡗࡓ㸬㸱
ᆤสࡾࡢ⠊ᅖࡣ᳜᱂ᮌࡢ࿘ᅖ༙ᚄ m ࡢ෇ෆ࡜ࡋ
ᖺ㛫ࡢᖹᆒ࡛ࡣ㸪᭱ࡶసᴗຌ⛬ࡀඃࢀ࡚࠸ࡓࡢࡣ㸪
ࡓ㸬
᭱ࡶపᐦᗘ࡛࠶ࡿ 1000 ᮏha ᳜᱂࡛ᆤสࡾࢆ⾜ࡗ
ha ࠶ࡓࡾࡢసᴗຌ⛬࡟ᙳ㡪ࡍࡿせᅉࢆ᫂ࡽ࠿࡟
ࡓሙྜ࡛࠶ࡗࡓࠋ㏻ᖖ᪋ᴗ࡛࠶ࡿ 3000 ᮏha ࡛ࡢ
ࡍࡿࡓࡵ㸪⟬ฟࡋࡓసᴗຌ⛬ࢆ┠ⓗኚᩘ㸪ୗสࡾ
඲สࡾࢆ 100 ࡜ࡋࡓሙྜ㸪 1000 ᮏha ᳜᱂࡛ࡢ
᪉ἲ㸪᳜᱂ᐦᗘ㸪ୗสࡾᐇ᪋ᖺ㸪ᶞ✀ࢆㄝ᫂ኚᩘ
ᆤสࡾࡣ㸪ࢫࢠ 43㸪ࣄࣀ࢟ 36 ࡜࡞ࡾ㸪సᴗຌ⛬
࡜ࡋ㸪୍⯡໬⥺ᙧࣔࢹࣝ࡟ࡼࡾゎᯒࢆ⾜ࡗࡓࠋ࠸
ࡀ⣙ 6 ๭▷⦰ࡉࢀࡿࡇ࡜ࡀศ࠿ࡗࡓ㸬
ࡎࢀࡢㄝ᫂ኚᩘࡶ᭷ព࡟సᴗຌ⛬࡟ᙳ㡪ࡋ࡚࠸ࡿ
ࡇ࡜ࡀศ࠿ࡗࡓࡀ㸪ྛኚᩘࡢ㛫࡟஺஫స⏝ࡀㄆࡵ
ୗสࡾ᪉ἲ࡟ࡼࡿẚ㍑
ࡽࢀࡓ㸬ࡑࡢࡓࡵ㸪ࡑࢀࡒࢀࡢㄝ᫂ኚᩘ࡟࠾࠸࡚㸪
ྛᖺࡢᶞ✀ཬࡧ᳜᱂ᐦᗘู࡟ୗสࡾ᪉ἲࡢᙳ㡪
ࡑࡢ௚ࡢ᮲௳ࢆ୍ᐃ࡟ࡋࡓୖ࡛㸪ୗสࡾ᪉ἲ㛫㸪
ࢆẚ㍑ࡍࡿ࡜㸪᭱ࡶ᳜᱂ᐦᗘࡢప࠸ 1000 ᮏha ༊
ᶞ✀㛫࡟࠾࠸࡚ࡣ Mann㸫Whitney ࡢ u ᳨ᐃ㸪᳜
࡛ࡣ㸪୧ᶞ✀ࡢ㏻ᖺᖹᆒ࡛ᆤสࡾࡢຌ⛬ࡀ඲สࡾ
᱂ᐦᗘ㛫㸪ᖺḟ㛫࡟࠾࠸࡚ࡣ .UXVNDO:DOOLV ᳨ᐃ
ࡢ⣙ 㸣࡛࠶ࡾ㸪3 ᖺ┠ࡢࢫࢠࢆ㝖ࡃ࡜㸪࡝ࡢᖺ
ࢆ⾜࠸㸪సᴗຌ⛬ࡢẚ㍑ࢆ⾜ࡗࡓ㸬
ࡶᆤสࡾࡢ᪉ࡀ᭷ព࡟ඃࢀ࡚࠸ࡓ㸬2000 ᮏ/ha ༊
࡛ࡣ㸪୧ᶞ✀ࡢ㏻ᖺᖹᆒ࡛ᆤสࡾࡢຌ⛬ࡀ඲สࡾ
㞧ⲡᮌࡢ᳜⏕ㄪᰝ
ࡢ⣙ 㸣࡛࠶ࡾ㸪ࢫࢠࡢ 1 ᖺ┠㸪ࣄࣀ࢟ࡢ ᖺ┠
สᡶ࠸ᑐ㇟࡜࡞ࡿ㞧ⲡᮌ࡟ࡘ࠸࡚㸪ୗสࡾࢆ⾜
ࡢࡳᆤสࡾࡀ᭷ព࡟ඃࢀ࡚࠸ࡓ㸬᭱ࡶᐦᗘࡢ㧗࠸
࠺┤๓࡟ྛ༊⏬௵ពࡢ 10 ᆅⅬ࡛ 1㹫ᅄ᪉ࡢࣉࣟࢵ
3000 ᮏ/ha ༊࡛ࡣ㸪୧ᶞ✀ࡢ㏻ᖺᖹᆒ࡛ᆤสࡾࡢ
ࢺࢆタࡅ㸪ࣉࣟࢵࢺෆࡢ᳜⿕⋡࡜᳜⏕㧗ࢆㄪᰝࡋ㸪
ຌ⛬ࡣ඲สࡾࡢ⣙ 93㸣࡛࠶ࡾ㸪1 ᖺ┠㸪 ᖺ┠ࡢࣄ
ࡑࡢ✚࡛࠶ࡿ᳜⏕㔞ࢆ⟬ฟࡋࡓ㸬඲࡚ࡢᖺ࡟ྛ༊
ࣀ࢟ࡢ༊⏬ࡢࡳᆤสࡾࡀ᭷ព࡟ඃࢀ࡚࠸ࡓࡀ㸪ࡑ
⏬࡛ᚓࡽࢀࡓసᴗຌ⛬ࡢᖹᆒ࡜㸪᳜⿕⋡㸪᳜⏕㧗㸪
ࡢ࡯࠿ࡢ༊⏬࡛ࡣ࡝ࡢᖺࡶୗสࡾ᪉ἲ࡟ࡼࡿసᴗ
᳜⏕㔞ࡢᖹᆒࡢ್ࢆ⏝࠸㸪ࢫࣆ࢔࣐ࣥࡢ㡰఩┦㛵
ຌ⛬࡟᭷ព࡞ᕪࡣࡳࡽࢀ࡞࠿ࡗࡓ(Mann㸫
ಀᩘࡢ᳨ᐃ࡟ࡼࡗ࡚᳜᱂ᐦᗘู㸪ୗสࡾ᪉ἲู࡟
Whitney ࡢ u ᳨ᐃ㸪㹮㸺0.01㸬
ࡑࢀࡒࢀࡢ┦㛵ࡢ᭷↓ࢆㄪᰝࡋࡓ㸬ࡑࡢ⤖ᯝ㸪࠸
ࡎࢀࡶᆤสࡾࡢሙྜ࡟ࡢࡳ┦㛵ࡀぢࡽࢀ㸪୰࡛ࡶ
᳜᱂ᐦᗘ࡟ࡼࡿẚ㍑
㧗࠸┦㛵ಀᩘࡀᚓࡽࢀࡓࡢࡣ᳜⏕㔞࡛࠶ࡗࡓ㸬᳜
ྛᖺࡢᶞ✀ཬࡧୗสࡾ᪉ἲู࡟᳜᱂ᐦᗘࡢᙳ㡪
⏕㔞࡟ࡼࡿసᴗຌ⛬ࡢᙳ㡪ࢆ㝖ࡃࡓࡵ㸪ྛ༊⏬ࡢ
ࢆẚ㍑ࡍࡿ࡜㸪1 ᖺ┠㸪2 ᖺ┠ࡢ඲สࡾ༊ࢆ㝖ࡁ㸪
᳜⏕㔞࠶ࡓࡾࡢసᴗຌ⛬ࡢᖹᆒࢆ⟬ฟࡋࡓ㸬
࠸ࡎࢀࡢሙྜࡶపᐦᗘ᳜᱂࡟࡞ࡿ࡯࡝ຌ⛬ࡀඃࢀ
ࡿഴྥ࡟࠶ࡗࡓ㸬≉࡟ᆤสࡾ࡛ࡣ㸪඲࡚ࡢ༊⏬࡟
᳜᱂ᐦᗘࡢ␗࡞ࡿࢫࢠ࣭ࣄࣀ࢟㐀ᯘᆅ࡟࠾ࡅࡿୗสࡾ᪉ἲࡢ㐪࠸ࡀసᴗຌ⛬࡜᳜᱂ᮌࡢึᮇᡂ㛗㔞࡟ཬࡰࡍᙳ㡪
91
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⾲㸯 ᳜᱂ᐦᗘࡢ␗࡞ࡿࢫࢠ࣭ࣄࣀ࢟ᗂ㱋ᮌ࡟࠾ࡅࡿ ᖺ㛫ࡢୗสࡾసᴗຌ⛬⾲
ᖺ┠㸦ᖺ㸧
ᖺ┠㸦ᖺ㸧
㏻ᖺᖹᆒ
ᖺ┠㸦ᖺ㸧
సᴗຌ⛬㸦᫬㛫 ୗสࡾ
సᴗຌ⛬㸦᫬㛫 ୗสࡾ
సᴗຌ⛬㸦᫬㛫 ୗสࡾ
ᆤ඲ ㏻ᖖ᪋ᴗ
KDࠊs6'㸧
KDࠊs6'㸧
KDࠊs6'㸧
᪉ἲ㛫
᪉ἲ㛫
᪉ἲ㛫 㸦㸣㸧 ࡜ࡢẚ㍑
඲สࡾ 32.83 s 8.27 㻖㻖
23.45 s 6.60
16.17 s 6.96 ns
65
㻖㻖
1,000
72
7.66
ᆤสࡾ 16.58 s 10.73
43
12.91 s 8.46
17.64 s
4.98
඲สࡾ 45.46 s 27.30
35.03 s 6.54
24.50 s
98
ns
ns
㻖
2,000
93
ࢫࢠ
ᆤสࡾ 37.58 s 17.74
28.87 s 0.60
28.22 s 14.38
86
඲สࡾ 44.18 s 20.93 ns
31.62 s 12.71 ns
34.77 s 17.39 ns
100
3,000
103
ᆤสࡾ 36.28 s 17.23
44.99 s 24.33
29.63 s 15.20
103
᳜᱂ᐦᗘ㛫
඲สࡾ QV ᆤสࡾ ඲สࡾ ᆤสࡾ ඲สࡾ ᆤสࡾ ඲สࡾ 30.50 s 11.08
24.58 s 6.05
17.71 s 6.26
73
㻖㻖
㻖㻖
50
1,000
㻖㻖
ᆤสࡾ 11.13 s 5.76
12.52 s 8.24
11.00 s 5.99
36
඲สࡾ 46.07 s 20.69
28.80 s 8.33
26.85 s 15.86
101
ns
㼚㼟
㻖㻖
2,000
66
ࣄࣀ࢟
ᆤสࡾ 26.49 s 10.55
19.83 s
19.47 s 7.18
67
඲สࡾ 40.74 s 3.78 㻖㻖
28.97 s 12.05
29.19 s 7.43
100
ns
㻖㻖
3,000
83
ᆤสࡾ 20.47 s 9.02
34.04 s 16.36
24.05 s 11.11
83
᳜᱂ᐦᗘ㛫
඲สࡾ QV ᆤสࡾ ඲สࡾ QV ᆤสࡾ ඲สࡾ ᆤสࡾ ns
ns
ns
඲สࡾ
69
61
1,000
ns
ns
ᆤสࡾ
40
ns
ns
ns
඲สࡾ
100
ᶞ✀㛫
80
2,000
ᶞ✀ᖹᆒ
ns
ns
ᆤสࡾ
76
ns
ns
ns
඲สࡾ
100
93
3,000
ᆤสࡾ
93
㸯㸧ࡣ㸳㸣Ỉ‽ࠊࡣ㸯㸣Ỉ‽ࡢ᭷ពᕪࡀ࠶ࡿࡇ࡜ࢆࠊQVࡣ᭷ពᕪࡀ࡞࠸ࡇ࡜ࢆࠊࡣ⤫ィゎᯒࡀ୙ྍࡔࡗࡓࡇ࡜ࢆ♧ࡍࠋ
ࠉ㸦ୗสࡾ᪉ἲ㛫ཬࡧᶞ✀㛫ࠉ0DQQ:KLWQH\ࡢX ᳨ᐃࠊ᳜᱂ᐦᗘ㛫ཬࡧᖺḟ㛫ࠉ.UXVNDO:DOOLV᳨ᐃ㸧
㸰㸧สᡶ࠸᫬㛫⛣ື᫬㛫
ࠉࠉ⤥Ἔ࣭ล◊ࡂ࣭ఇ᠁᫬㛫ࡣ㝖࠸ࡓ
㸱㸧㏻ᖖ᪋ᴗ࡜ࡣ㸪ᮏKD᳜᱂㸪඲สࡾࢆ⾜ࡗࡓሙྜࢆᣦࡍࠋࠉ
᳜᱂ᐦᗘ
ᶞ✀
㸦ᮏKD㸧
50
඲สࡾ
సᴗຌ⛬㸦᫬㛫KD㸧
సᴗຌ⛬㸦᫬㛫KD㸧
50
ୗสࡾ
᪉ἲ
40
30
20
10
20
ᖺḟ㛫ࡢẚ㍑
10
ྛ༊⏬࡛㸪ᖺḟ㛫ࡢẚ㍑ࢆ⾜
࠺࡜㸪ࢫࢠࡢ 1000 ᮏha ༊㸪
0
0
0.0
0.2
0.4
0.6
0.8
ns
ns
࡚࠸ࡓศᩓศᯒ㸪㹮㸺0.01)
R2 = 0.329
P=0.031
30
ns
ns
࠾࠸࡚ᐦᗘࡢᙳ㡪ࡀ᭷ព࡟⌧ࢀ
ᆤสࡾ
40
ᖺḟ㛫
0.0
1.0
0.2
0.4
1)㹎್ࡣࢫࣆ࢔࣐ࣥࡢ㡰఩┦㛵ಀᩘࢆ♧ࡍࠋ
᳜⿕⋡
0.6
0.8
1.0
᳜⿕⋡
2000 ᮏha ඲สࡾ༊㸪3000 ᮏ
ha ᆤสࡾ༊㸪ࣄࣀ࢟ࡢ 1000
ᅗ ୗสࡾ᪉ἲูࡢ᳜⿕⋡࡜సᴗຌ⛬ࡢ㛵ಀ
ᮏha ༊㸪 ᮏKD ᆤสࡾ༊㸪
඲สࡾ
40
30
20
R2=0.174
P=0.077
10
ᆤสࡾ
R2 = 0.317
P=0.018
50
సᴗຌ⛬㸦᫬㛫KD㸧
సᴗຌ⛬㸦᫬㛫KD
50
40
3000 ᮏ/ha ᆤสࡾ༊࡟࠾࠸࡚᭷
ពᕪࡀぢࡽࢀࡓ㹮㸺0.01㸬ࡋ
30
࠿ࡋ㸪ࡑࡢኚື࡟ྛ༊⏬ࢆ㏻ࡌ
20
ࡓ୍ᐃࡢഴྥࡣぢࡽࢀ࡞࠿ࡗࡓ㸬
10
0
ᶞ✀㛫ࡢẚ㍑
0
㻜㻚㻜
㻜㻚㻡
㻝㻚㻜
᳜⏕㧗㸦㹫㸧
㻝㻚㻡
㻞㻚㻜
㻜㻚㻜
㻜㻚㻡
㻝㻚㻜
㻝㻚㻡
㻞㻚㻜
᳜⏕㧗㸦㹫㸧
1)㹎್ࡣࢫࣆ࢔࣐ࣥࡢ㡰఩┦㛵ಀᩘࢆ♧ࡍࠋ
㍑ࢆ⾜࠺࡜㸪1000 ᮏ/ha ᆤสࡾ
ᅗ ୗสࡾ᪉ἲูࡢ᳜⏕㧗࡜సᴗຌ⛬ࡢ㛵ಀ
㻡㻜
඲สࡾ
సᴗຌ⛬㸦᫬㛫KD㸧
సᴗຌ⛬㸦᫬㛫KD㸧
㻡㻜
㻠㻜
㻟㻜
R2=0.15
3
㻞㻜
㻝㻜
䛆ᶞ✀ู䛇
䝇䜼
ຌ⛬
㻜
㻜㻚㻜
ⲡ㔞
ຌ⛬
㻟㻝㻚㻢㻞
㻜㻚㻤
㻞㻤㻚㻥㻣
㻟㻜
㻞㻜
㻜㻚㻣㻢
㻜㻚㻞㻤
㻜㻚㻟㻝
㻜㻚㻟㻝
༊ࡢ㸯ᖺ┠㸪 ᮏKD ᆤสࡾ
ᆤสࡾ
ⲡ㔞
㻝
㻜㻚㻢㻢㻞㻢㻤
༊ࡢ ᖺ┠㸪 ᮏKD ᆤสࡾ
㻜㻚㻢㻢㻞㻢㻤
㻝
༊ࡢ 㹼 ᖺ┠࡛㸪ࣄࣀ࢟ࡢຌ⛬
┦㛵ศᯒ⾲
ຌ⛬㻘ⲡ㔞
䝕䞊䝍ᩘ ┦㛵ಀᩘ
㻝㻤
㻜㻚㻢㻢㻞㻢㻤
㻝㻜
㻜
ⲡ㔞
㻟㻞㻚㻤㻟㻝㻚㻜
㻜㻚㻣㻥
㻟㻜㻚㻡㻜
㻜㻚㻡 㻠㻠㻚㻝㻤
㻝㻚㻡 㻠㻜㻚㻣㻠
㻞㻚㻜
㻝㻚㻞㻠
㻞㻟㻚㻠㻡
㻜㻚㻠㻝
㻞㻠㻚㻡㻤
᳜⏕㔞㸦᳜⿕⋡™᳜⏕㧗㸧
㻠㻜
ຌ⛬
ຌ⛬
ⲡ㔞
䝇䜼
䝢䜰䝋䞁䛾┦㛵ಀᩘ䛾᳨ᐃ
㻜㻚㻜
ྛᖺࡢྛ༊⏬࡛㸪ᶞ✀㛫ࡢẚ
㻜㻚㻡
㻝㻚㻜
್㻔୧ഃ☜⋡
䡐್
㻟㻚㻡㻟㻥㻠㻣㻝
㻜㻚㻜㻜㻞㻣㻞㻢
2
R = 0.439
P=0.006
㻝㻚㻡
┦㛵ಀᩘ⾜ิ
᳜⏕㔞㸦᳜⿕⋡™᳜⏕㧗㸧
1)㹎್ࡣࢫࣆ࢔࣐ࣥࡢ㡰఩┦㛵ಀᩘࢆ♧ࡍࠋ
ᅗ ୗสࡾ᪉ἲูࡢ᳜⏕㔞࡜సᴗຌ⛬ࡢ㛵ಀ
㻞㻚㻜
ࡀඃࢀ࡚࠸ࡓp㸺0.
05㸬ࡋ࠿
ࡋ㸪ࡑࡢ௚ࡢ༊⏬࡛ᶞ✀࡟ࡼࡿ
ᕪࡣぢࡽࢀ࡞࠿ࡗࡓ㸬
㞧ⲡᮌࡢ᳜⏕ࡀୗสࡾ
సᴗࡢຌ⛬࡟ཬࡰࡍᙳ㡪
92
㟼ᒸ┴㎰ᯘᢏ⾡◊✲ᡤ◊✲ሗ࿌ ➨ 8 ྕ(2015)
________________________________________________________________________________
సᴗຌ⛬ࡢᖹᆒ್࡜᳜⿕⋡㸪᳜⏕㧗㸪᳜⏕㔞ࡢ
ϫ ⪃ ᐹ
ᖹᆒ್࡜ࡢ┦㛵㛵ಀࡢ᭷↓ࢆㄪ࡭ࡓ⤖ᯝ㸪ᆤสࡾ
ࡢࡳ࡟㸪඲࡚ࡢ㡯┠࡛సᴗຌ⛬࡜ࡢ┦㛵㛵ಀࡀㄆ
ࡵࡽࢀࡓ㹮㸺0.05ᅗ 2㸪3㸪4㸬ྛ༊ࡢ᳜⏕㔞ࡣ
㸬 ᳜᱂ᐦᗘ࡜ୗสࡾ᪉ἲࡢ㐪࠸ࡀసᴗຌ⛬
࡟ཬࡰࡍᙳ㡪
␗࡞ࡿࡓࡵࠊヨ㦂༊㛫ࡢẚ㍑ࢆࡼࡾ㐺ṇ࡟⾜࠺┠
௒ᅇࡢ⤖ᯝ࡛ࡣ㸪᳜᱂ᐦᗘࡢప࠸༊⏬࡛㸪ᆤส
ⓗ࡛㸪᳜⏕㔞࠶ࡓࡾࡢసᴗຌ⛬ࢆ⟬ฟࡋࡓ࡜ࡇࢁ㸪
ࡾࡢసᴗຌ⛬ࡀඃࢀࡿഴྥ࡟࠶ࡗࡓ㸬ࡇࡢ⌮⏤࡜
඲࡚ࡢ༊⏬࡟࠾࠸࡚㸪㏻ᖺᖹᆒ࡛ࡢᆤสࡾࡢຌ⛬
ࡋ࡚㸪สᡶ࠸᪉ἲཬࡧ᳜᱂ᐦᗘࡢ㐪࠸࡟ࡼࡿสᡶ
ࡀ඲สࡾࡼࡾඃࢀࡿ⤖ᯝ࡜࡞ࡗࡓ㸦⾲ 2㸧㸬ࡲࡓ㸪
࠸㠃✚ࡢᕪࡀ⪃࠼ࡽࢀࡿ㸬඲สࡾ࡛ࡣ㸪᳜᱂ᐦᗘ
㏻ᖖ᪋ᴗ࡛࠶ࡿ 3000 ᮏha ࡛ࡢ඲สࡾࢆ 100 ࡜ࡋ
࡟㛵ಀ࡞ࡃ඲࡚ࡢ㠃✚ࢆสࡾᡶ࠺ᚲせࡀ࠶ࡿࡀ㸪
ࡓሙྜ㸪 1000 ᮏha ᳜᱂࡛ࡢᆤสࡾࡣ㸪ࢫࢠ 46㸪
ᆤสࡾࡣ᳜᱂ᮌࡢ࿘ᅖࡢࡳสࡾᡶ࠺ࡓࡵ㸪สᡶ࠸
ࣄࣀ࢟ 20 ࡜࡞ࡾ㸪సᴗຌ⛬ࡀ⣙㸵๭▷⦰ࡉࢀࡿࡇ
㠃✚ࡣ᳜᱂ᐦᗘࡀ␯࡟࡞ࡿ࡯࡝ᑠࡉࡃ࡞ࡿ㸬3000
࡜ࡀศ࠿ࡗࡓ㸬
ᮏha ༊࡛ࡣ᳜᱂ᮌ㛫ࡀ⣙ 1.83㹫ࡋ࠿࡞ࡃ㸪᳜᱂
ᮌࡢ࿘ᅖ 1㹫ࡢสᡶ࠸㠃✚ࡣྜィ ੍/ha ࡜࡞
᳜᱂ᐦᗘ࡜ୗสࡾ᪉ἲࡀ᳜᱂ᮌࡢึᮇᡂ
㛗㔞࡟ཬࡰࡍᙳ㡪
ࡾ㸪ᆤสࡾࡢຠᯝࡣࡑࢀ࡯࡝⌧ࢀ࡞࠿ࡗࡓࡀ㸪᳜
ᡂ㛗㔞ㄪᰝࡢ⤖ᯝࢆ⾲ 3 ࡟♧ࡍ㸬᳜᱂ᐦᗘࡢྠ
✚ࡣ 3140 ੍/ha ࡜ 3000 ᮏha ༊ࡢ⣙ 4 ๭࡜ᑠࡉ
ࡌ༊⏬࡟࠾࠸࡚㸪ୗสࡾ᪉ἲࡢ㐪࠸ࢆẚ㍑ࡋࡓ⤖
ࡃ࡞ࡿࡓࡵ㸪సᴗຌ⛬ࡣඃࢀࡓ⤖ᯝ࡜࡞ࡗࡓ࡜⪃
ᯝ㸪ୖ㛗ᡂ㛗ࡣ࡝ࡢ༊⏬ࡶ୧⪅࡟ᕪࡣぢࡽࢀ࡞࠿
࠼ࡽࢀࡿ㸬࡞࠾㸪3 ᖺ┠࡟ࡣ㸪඲สࡾ࡟࠾࠸࡚ࡶ᳜
ࡗࡓ㸬┤ᚄᡂ㛗ࡣ㸪1000 ᮏ/ha ࡛ࡣᆤสࡾ༊࡛ 31.1
᱂ᐦᗘࡀ␯࡟࡞ࡿ࡯࡝సᴗຌ⛬ࡣඃࢀࡿ⤖ᯝ࡜࡞
ੈ㸪඲สࡾ༊࡛ 26.3 ੈ࡜࡞ࡾ㸪ᆤสࡾ༊ࡀ඲สࡾ
ࡗࡓ㸬ࡇࢀࡣᒸᮏࡽ ࡢሗ࿌࡜ྠࡌഴྥ࡟࠶ࡿ㸬᳜
༊ࡼࡾ᭷ព࡟኱ࡁ࠿ࡗࡓ㹮㸺0.05㸬ࡋ࠿ࡋ㸪2000
᱂ࡢ ᖺ┠࡟ࡣ㸪᳜᱂ᮌࡣ኱ࡁࡃ⫱ࡕ㸪ୗสࡾᑐ
ᮏha ࡛ࡣ඲สࡾ༊࡛ 22.5 ੈ㸪ᆤสࡾ༊࡛ 18.9 ੈ
㇟ࡢ㞧ⲡᮌ࡜ࡣẚ㍑ⓗᐜ᫆࡟༊ู࡛ࡁࡿࡼ࠺࡟࡞
࡜࡞ࡾ㸪඲สࡾ༊ࡀᆤสࡾ༊ࡼࡾ᭷ព࡟㧗࠿ࡗࡓ
ࡿࡓࡵ㸪どㄆ࡟ᚲせ࡞᫬㛫ࡣసᴗຌ⛬ࡢ㔜せ࡞せ
㹮㸺0.01㸬
ᅉ࡛ࡣ࡞ࡃ࡞ࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡋ࠿ࡋ㸪୍᪉࡛㸪
ୗสࡾసᴗ࡟࠾࠸࡚᳜᱂ᮌࡀከ࠸࡜㸪ㄗఆࢆ㑊ࡅ
᱂ᮌ㛫ࡀ 3.16㹫࠶ࡿ 1000 ᮏha ༊࡛ࡣ㸪สᡶ࠸㠃
⾲㸰 ᳜⏕㔞ࢆຍ࿡ࡋࡓ᳜᱂ᐦᗘูࢫࢠ࣭ࣄࣀ࢟ᗂ㱋ᮌ࡟࠾ࡅࡿୗสࡾసᴗຌ⛬
᳜᱂ᐦᗘ
ᶞ✀
㸦ᮏKD㸧
ࢫࢠ
ࣄࣀ࢟
సᴗຌ⛬㸦᫬㛫KD㸧᳜⏕㔞㸦᳜⿕⋡™᳜⏕㧗㸧
ୗสࡾ
᪉ἲ
ᖺ┠
ᖺ┠
ᖺ┠
㏻ᖺ
඲สࡾ
ᆤสࡾ
඲สࡾ
ᆤสࡾ
඲สࡾ
ᆤสࡾ
඲สࡾ
ᆤสࡾ
඲สࡾ
ᆤสࡾ
඲สࡾ
ᆤสࡾ
ᆤ඲ ㏻ᖖ᪋ᴗ
㸦㸣㸧 ࡜ࡢẚ㍑
⾲ ␗࡞ࡿ᳜᱂ᐦᗘ࣭᪉ἲ࡛ୗสࡾࢆ⾜ࡗࡓሙྜࡢࢫࢠࡢᡂ㛗㔞
ୖ㛗ᡂ㛗FP
┤ᚄᡂ㛗PP
᳜᱂ᐦᗘᮏKD ୗสࡾ᪉ἲ
඲สࡾ
182.8 ±
24.7 㼚㼟 26.3 ±
9.0
1000
ᆤสࡾ
180.6 ±
47.1
31.1 ±
7.6 㻖
඲สࡾ
139.4 ±
33.9 㼚㼟 22.5 ±
6.6 㻖㻖
2000
ᆤสࡾ
134.3 ±
41.2
18.9 ±
7.2
඲สࡾ
173.3 ±
61.6 㼚㼟 23.0 ±
8.4 㼚㼟
3000
ᆤสࡾ
183.0 ±
46.3
25.8 ±
8.4
ࡣỈ‽ࡢ᭷ពᕪࠊࡣỈ‽ࡢ᭷ពᕪࡀ࠶ࡾࠊQVࡣ᭷ពᕪࡀ࡞࠸ࡇ࡜ࢆ♧ࡍ㸦㹲᳨ᐃ㸧
ୗสࡣᖺ㛫ᐇ᪋
᳜᱂ᐦᗘࡢ␗࡞ࡿࢫࢠ࣭ࣄࣀ࢟㐀ᯘᆅ࡟࠾ࡅࡿୗสࡾ᪉ἲࡢ㐪࠸ࡀసᴗຌ⛬࡜᳜᱂ᮌࡢึᮇᡂ㛗㔞࡟ཬࡰࡍᙳ㡪
93
________________________________________________________________________________
ࡿࡓࡵ࡟㸪సᴗဨࡣⲡสᶵࢆៅ㔜࡟ᢅࡗ࡚᳜᱂ᮌ
㑅ᢥࡍࡿࡇ࡜ࡣ┬ຊⓗ࡞ᯘᴗࢆ⾜࠺ୖ࡛᭷ຠ࡛࠶
ࡢ࿘㎶ࢆสࡾྲྀࡿሙ㠃ࡀቑ࠼ࡿ㸬᳜᱂ᐦᗘࡀ␯࡟
ࡿࡇ࡜ࡀ᫂ࡽ࠿࡟࡞ࡗࡓ㸬
࡞ࡿ࡯࡝ࣜࢬ࣒ࡼࡃสࡾྲྀࢀࡿࡓࡵ㸪ඃࢀࡓసᴗ
Ϭ ᦬ せ
ຌ⛬࡟࡞ࡗࡓ࡜⪃࠼ࡽࢀࡿ㸬
㞧ⲡᮌࡢ᳜⏕ࡀୗสࡾసᴗࡢຌ⛬࡟ཬࡰ
ࡍᙳ㡪
1000 ᮏha ࡢపᐦᗘ᳜᱂༊࡟࠾࠸࡚ᆤสࡾࢆ⾜
㞧ⲡᮌࡢ㧗ࡉ࡜ୗสࡾຌ⛬ࡢ㛵ಀ࡟ࡘ࠸࡚㸪㔠
สࡾࢆ⾜ࡗࡓሙྜࡼࡾ㸪సᴗຌ⛬ࡀ㸵๭▷⦰ࡉࢀ
ᇛࡽ ࡣ㸪㞧ⲡᮌࡢ⩌ⴠ㧗ࡉࡀ㧗ࡃ࡞ࡿ࡯࡝㸪ୗส
ࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬ୗสࡾຌ⛬࡟㛵ಀࡍࡿせᅉ࡜
ࡾ࡟せࡋࡓேᕤᩘࡀቑຍࡍࡿഴྥ࡟࠶ࡿ࡜ሗ࿌ࡋ
ࡋ࡚ࡣ㸪สᡶ࠸㠃✚㸪᳜⏕㔞࡞࡝ࡀ㛵ಀࡋ࡚࠸ࡿ
࡚࠸ࡿ㸬௒ᅇࡢ⤖ᯝ࡛ࡣ㸪඲สࡾ࡛ࡣ᳜⏕࡜ࡢ┦
࡜⪃࠼ࡽࢀࡓ㸬ୗสࡾ᪉ἲ࡜᳜᱂ᮌࡢᡂ㛗࡟ࡘ࠸
㛵ࡣぢࡽࢀ࡞࠿ࡗࡓࡶࡢࡢ㸪ᆤสࡾ࡟࠾࠸࡚ࡣ᳜
࡚ࡣ㸪ୖ㛗ᡂ㛗㸪┤ᚄᡂ㛗࡜ࡶ࡟᫂☜࡞ഴྥࡣぢ
⿕⋡ཬࡧ᳜⏕㧗㸪᳜⏕㔞ࡀ኱ࡁࡃ࡞ࡿ࡯࡝సᴗຌ
ࡽࢀ࡞࠿ࡗࡓ㸬ᯘᆅࡢ≧ἣࢆぢᴟࡵࡓୖ࡛㸪పᐦ
⛬ࡀቑ኱ࡍࡿഴྥ࡟࠶ࡗࡓ㸬ࡇࢀ࡟ࡣ㸪᳜᱂ᮌࡢ
ᗘ᳜᱂࣭ᆤสࡾࢆ㑅ᢥࡍࡿࡇ࡜ࡣ┬ຊⓗ࡞ᯘᴗࢆ
どㄆ⋡ࡀ㛵ࢃࡗ࡚࠸ࡿྍ⬟ᛶࡀ࠶ࡿ㸬඲สࡾ࡛ࡣ
ᐇ⌧ࡉࡏࡿୖ࡛᭷ຠ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡓ㸬
༊⏬ࡢ㝮࠿ࡽสࡾᡶࡗ࡚࠸ࡃࡓࡵ㸪⛣ື๓࡟᳜᱂
ࡗࡓሙྜ㸪㏻ᖖ᪋ᴗ࡛࠶ࡿ 3000 ᮏha ࡢᐦᗘ࡛඲
ㅰ ㎡
ᮌࢆ᥈ࡍᚲせࡣప࠸࡜᥎ᐹࡉࢀࡿࡀ㸪⛣ື๓࡟᳜
᱂ᮌࡢ఩⨨ࢆᢕᥱࡍࡿᚲせᛶࡢ࠶ࡿᆤสࡾ࡟࠾࠸
ᮏ◊✲ࡢ⌧ᆅㄪᰝ࡟༠ຊཬࡧᨭ᥼ࢆ࠸ࡓࡔ࠸ࡓ
࡚㸪㞧ⲡᮌ࡟ࡼࡿぢ㏻ࡋࡢᝏࡉࡣసᴗຠ⋡ࡢపୗ
ᙜࢭࣥࢱ࣮◊✲ဨཬࡧ㟼ᒸ┴す㒊㎰ᯘ஦ົᡤኳ❳
࡟ࡘ࡞ࡀࡿ࡜⪃࠼ࡽࢀࡿ㸬ᐇ㝿㸪సᴗဨ࠿ࡽࡣࠕ᳜
㎰ᯘᒁ᳃ᯘᩚഛㄢࡢ⫋ဨྛ఩࡟ࡇࡢሙࢆ೉ࡾ࡚ᚰ
᱂ᮌࡢ఩⨨ࡀࢃ࠿ࡾ࡙ࡽ࠸ࠖ࡜ࡢពぢࡀᐤࡏࡽࢀ㸪
ࡼࡾឤㅰ⏦ࡋୖࡆࡿ㸬
ࡑࡢᙳ㡪ࡣ኱ࡁ࠸࡜᥎ᐹࡉࢀࡓ㸬
ᘬ ⏝ ᩥ ⊩
᳜᱂ᐦᗘ࡜ୗสࡾ᪉ἲࡀ᳜᱂ᮌࡢึᮇᡂ
㛗㔞࡟ཬࡰࡍᙳ㡪
௒ᅇࡢ⤖ᯝ࡛ࡣ㸪࡝ࡢ᳜᱂ᐦᗘ࡟࠾࠸࡚ࡶୖ㛗
1)ఀ⸨Ṋ἞࣭ᒣ⏣ᐜ୕2001㸸ୗสࡾ᫬ᮇ ࡢኚ᭦࡟ࡼࡿປാ㈇ᢸ㍍ῶᗘ࡜㞧ⲡᮌᢚไຠᯝ
ࡢゎᯒ㸬᪥ᯘㄅ 83㸪191㹼196
ᡂ㛗࡟ᕪࡣぢࡽࢀ࡞࠿ࡗࡓ㸬୍᪉㸪┤ᚄᡂ㛗ࡣ 1000
2)㔠ᇛᬛஅ࣭ᑎᒸ⾜㞝࣭ⰱཎㄔ୍࣭➉ෆ㑳㞝࣭஭಴
ᮏha ༊࡛ࡣᆤสࡾ㸪2000 ᮏha ༊࡛ࡣ඲สࡾࡀ
ὒ஧࣭ᾆࡵࡄࡳ2011㸸ୗสࡾᐇ᪋ࣃࢱ࣮ࣥࡢ
ඃࢀ࡚࠾ࡾ㸪3000 ᮏ/ha ࡛ࡣᕪࡣ࡞ࡃࠊ᳜᱂ᐦᗘ
㐪࠸࡟ࡼࡿୗสࡾసᴗຌ⛬㸬㮵኱₇◊ሗ 38㸪㸵
ཬࡧୗสࡾ᪉ἲ࡟ࡼࡿ᫂☜࡞ഴྥࡣぢࡽࢀ࡞࠿ࡗ
㹼11
ࡓᚑࡗ࡚㸪ୗสࡾ᪉ἲ࡜᳜᱂ᮌࡢᡂ㛗ࡢ㛵ಀ࡟ࡘ
ᒸᮏ᠇࿴࣭Ώ㎶ᨻಇ࣭୰஭ ຬ࣭ྂ㔝ᮾὪ
࠸࡚ࠊ┤ᚄᡂ㛗࡟㛵ࡋ࡚ࡣ᫂☜࡟࡞ࡽ࡞࠿ࡗࡓࡀࠊ
1988㸸ୖ㈡ⱱヨ㦂ᆅ࡟࠾ࡅࡿᶞᮌ᳜᱂ᆅࡢୗ
ୖ㛗ᡂ㛗ࡣୗสࡾ᪉ἲ࡟ࡼࡿᕪࡣ⏕ࡌ࡞࠸ࡇ࡜ࡀ
สࡾసᴗຌ⛬࡟㛵ࡍࡿ᳨ウ㸬ி኱㎰₇㞟ሗ 18㸪
᫂ࡽ࠿࡟࡞ࡗࡓ㸬┤ᚄᡂ㛗࡟᫂☜࡞ഴྥࡀ⌧ࢀ࡞
53㹼64
࠿ࡗࡓ⌮⏤࡜ࡋ࡚ࠊ❧ᆅ➼ࡢ᮲௳࡟ࡼࡿග᮲௳ࡢ
4ኴ⏣ᚭᚿ࣭㧗ẚⰋ⪽࣭୰㛫ᗣ௓࣭ྜྷ⏣ⱱ୕㑻࣭
ᝏ໬ࡀ⪃࠼ࡽࢀࡿ㸬௒ᅇࡢㄪᰝᆅ࡛ࡣ㸪1000 ᮏha㸪
⁁ୖᒎஓ2013㸸ఆ᥇཰┈࡜᳜᱂⤒㈝ࡢほⅬ࠿
3000 ᮏha ༊ࡣẚ㍑ⓗ㉳అࡢᑡ࡞࠸ᯘᆅࡔࡗࡓࡀ㸪
ࡽࡳࡓపᐦᗘ᳜᱂ࡢ᭷ຠᛶ㸬᪥ᯘㄅ 95㸪126㹼
2000 ᮏha ༊ࡣୖẁཬࡧ୰ẁ࡟࢞ࢣࡀ࠶ࡾ㸪ග⎔
133
ቃࡀᆒ୍࡛࡞࠿ࡗࡓྍ⬟ᛶࡀ࠶ࡿ㸬ࡇࡢࡼ࠺࡟㸪
᳜᱂ᐦᗘࡸୗสࡾᡭἲࡀ᳜᱂ᮌࡢᡂ㛗࡟୚࠼ࡿᙳ
5ᯘ㔝ᗇ2013㸸ᖹᡂ 25 ᖺᗘ∧᳃ᯘ࣭ᯘᴗⓑ᭩㸪
඲ᅜᯘᴗᨵⰋᬑཬ༠఍㸸104pp㸬
㡪ࢆㄪᰝࡍࡿ⌧ᆅヨ㦂࡛ࡣ㸪㞧ⲡᮌ௨እࡢせᅉࡀ
6℧஭ᛅே㺃ⴗཎ㐍2008㸸ࠕ࿴ḷᒣࡢ⎔ቃᯘࠖᩚ
㛵୚ࡍࡿྍ⬟ᛶࡀ࠶ࡿࡓࡵ㸪ከࡃࡢ᳨ドࢆ⾜࠺ࡇ
ഛᡭἲ㛤Ⓨ㹼ึᮇᢞ㈨┬ຊ࡟ࡼࡿ㐀ᯘᡭἲࡢ☜
࡜㸪࡛ࡁࡿࡔࡅ᮲௳ࡀᆒ୍࡞ㄪᰝᆅ࡛ヨ㦂ࢆ⾜࠺
❧㹼㸬࿴ḷᒣ┴㎰ᯘỈᢏࢭ◊ሗ 㸷㸪61㹼72㸬
ࡇ࡜ࡀᚲせࡔ࡜⪃࠼ࡽࢀࡿ㸬
௒ᅇࡢヨ㦂⤖ᯝ࠿ࡽࡣ㸪పᐦᗘ᳜᱂࣭ᆤสࡾࢆ