༡ 㒊
3.4 㻌 ㄪᰝ⤖ᯝ䛸⪃ᐹ㻌
3.4.1 ༡㒊ᆅ༊ᆅୗỈㄪᰝ㻌
Figure 3.3䛿௦⾲ⓗ䛺 ᐃᆅⅬ䠄S1, S2, S3, S7, S10, S13䠅䛻䛚䛡䜛ᆅୗỈ䛾ኚື䛸 ༡㒊ᆅ༊㝆Ỉ㔞䜢♧䛧䛯䜒䛾䛷䛒䜛䠊ᴫ䛽䠈5᭶䛛䜙8᭶䛻䛛䛡䛶䛾℺₅ᮇ䛻ᆅୗỈ
䛿పୗ䛧䠈䛭䛾ᚋᚎ䚻䛻ᅇ䛩䜛ᵝᏊ䛜ぢ䜙䜜䜛䠊䛻㞵Ꮨ䛷䛒䜛7᭶䛛䜙9᭶䛻䛛 䛡䛶䜎䛸䜎䛳䛯㝆Ỉ䛜䛒䜛䛜䠈䛭䜜䜙䛻ᑐ䛧䛶ᆅୗỈ䛿᫂☜䛻ᛂ䛧䛶䛔䜛䛣䛸䛜ㄞ 䜏ྲྀ䜜䜛䠊䛯䛰䛧䠈㝆Ỉ㔞䛸ᆅୗỈ䛾ᨭ䜔Ꮨ䛻䛚䛡䜛ᆅୗỈ䛾ᅇ≧ἣ䜢㚷䜏䜛 䛸䠈༡㒊ᆅ༊䛾ᅽᆅୗỈ䛿ᆅ༊ෆ䛰䛡䛷䛿䛺䛟䠈༡䛻䛒䜛ୣ㝠䞉䜽䝤䝏◁₍ᆅᇦ䛒䜛 䛔䛿୍㒊䠈㒊ᆅ༊䛛䜙䛾ὶධ䛻䜘䛳䛶ᾰ㣴䛥䜜䛶䛔䜛䛸᥎ᐃ䛥䜜䜛䠊
Figure 3.3㻌ᆅୗỈ䛾ኚື䛸㝆Ỉ㔞
䠄2006ᖺ1᭶䛛䜙9᭶䜎䛷䛾ᆅୗỈ䛸2006ᖺ௨㝆䛾㝆Ỉ㔞䛿Ḟ 䠊䠅
⾲ 3.1: ༡㒊ᆅ༊䛻䛚䛡䜛pH䛸EC䛾ኚື䠄2002-2006ᖺ䠅
pH EC(mS/cm)
ᮇ㛫䠄᭶䠅 S2 S13 ༡㒊ᖹᆒ S2 S13 ༡㒊ᖹᆒ 1-3 7.93 7.98 8.12 0.739 1.283 0.863 4-6 7.84 7.94 8.04 0.714 1.223 0.842 7-9 7.85 7.87 7.96 0.755 1.280 0.884 10-12 8.09 8.04 8.16 0.748 1.321 0.866 ᖺ㛫 7.94 7.97 8.08 0.740 1.280 0.864
⾲㻌 3.2: ༡㒊ᆅ༊69⟠ᡤ䛾ᡞ䛻䛚䛡䜛
ᆅୗỈ䠈pH䠈EC䛾ᖹᆒ್䛸ᶆ‽೫ᕪ
ᖺᗘ ᆅୗỈ(m) pH EC(mS/cm)
2003 1004.6㼼5.1 8.08㼼0.36 1.52㼼0.90 2005 1002.7㼼5.4 7.76㼼0.22 1.45㼼0.70
3.4.2༡㒊ᆅ༊ᡞศᕸㄪᰝ䛚䜘䜃㎰ᆅㄪᰝ 35
⾲ 3.1 䛿௦⾲ⓗ䛺 ᐃᆅⅬ䠄S2 ᆅⅬ䠈S13 ᆅⅬ䛻䛚䛡䜛 1-3 ᭶䠈4-6 ᭶䠈7-9 ᭶䠈
10-12᭶䛾ᖹᆒ pH್䛸ᖹᆒEC ್䜢♧䛧䛯䜒䛾䛷䛒䜛䠊pH 䛿䛔䛪䜜䛾ᆅⅬ䠈ᮇ䜢䛸
䛳䛶䜒䜔䜔䜰䝹䜹䝸ഃ䛻ഴ䛝䠈EC䛿 0.50-1.50mS/cm๓ᚋ䛸⯡ⓗ䛻㧗䛔⃰ᗘ䜢♧䛧䛯䠊 䛯䛰䛧䠈㎰ᴗ⏝Ỉ䠄Ỉ✄䠅ᇶ‽䛷䛿EC䛿0.30mS/cm௨ୗ䛸䛥䜜䛶䛔䜛䛜䠈䛣䛾⛬ᗘ䛾್
䛿⇱ᆅ䛻䛚䛔䛶䛿≉䛻῝้䛺䜒䛾䛷䛿䛺䛔䠄䛯䛸䛘䜀䠈ᵳ䞉ୖ, 1998䠗Tanji, K. K.
and Kielen, N. C., 2002䠅䠊 ᐃᮇ㛫୰䠈pH䛸EC䛿䛔䛪䜜䜒㝆㞵䛺䛹䛾ᙳ㡪䛸ぢ䜙䜜䜛 ᑠ䛥䛺ኚື䛿ぢ䜙䜜䜛䜒䛾䛾䠈᫂☜䛺㛫ⓗ䞉Ꮨ⠇ⓗഴྥ䛿☜ㄆ䛷䛝䛺䛛䛳䛯䠊୍᪉䛷䠈 EC䛿ᐤ䜚䛻䛒䜛 ᐃᆅⅬ䛷್䛜㧗䛟䛺䜛䛸䛔䛖ᆅ⌮ⓗ䛺ഴྥ䜢☜ㄆ䛩䜛䛣䛸䛜ฟ᮶䛯䠊
≉䛻᭱䜒ᮾ䛻䛒䜛 S16ᆅⅬ䛷䛿 3.00mS/cm 䜢㉸䛘䜛್䛜᳨ฟ䛥䜜䛶䛚䜚䠈ሷ㢮㞟✚
䛺䛹䜒ⱝᖸᠱᛕ䛥䜜䜛≧ἣ䛻䛒䜛䠊䛣䛾䛣䛸䛛䜙䠈ᆅ༊ෆ㎰ᆅ䛛䜙ᆅୗỈ䜈䛾⁐ฟ≀㉁
䠄ᅵተ୰䛻ྵ䜎䜜䛶䛔䜛ሷ㢮䛺䛾䛛䠈⫧ᩱ⏤᮶䛾◪㓟ሷ䛺䛹䛾ሷ㢮䛺䛾䛛䛿᫂䠅䛜 ༡㒊䛾䜾䝥䝏◁₍ᆅᇦ䛛䜙䛻ྥ䛛䛖ᆅୗỈὶື䛻䜘䜚⛣ື䛧䛶䛔䜛䛾䛷䛿䛺䛔䛛䛸 ᥎ᐹ䛥䜜䜛䠊
3.4.2 ༡㒊ᆅ༊ᡞศᕸㄪᰝ䛚䜘䜃㎰ᆅㄪᰝ㻌
㻌⌧ᆅ䛷䛾㋃ᰝ䛻䜘䜚䠈2003ᖺ9᭶ 䛻ྠᆅ༊䛷☜ㄆฟ᮶䛯ᡞ䛿 233
⟠ᡤ䠈2005ᖺ9᭶䛻䛿䛭䜜䛻ຍ䛘 䛶 91 ⟠ᡤ䜢☜ㄆ䛩䜛䛣䛸䛜ฟ᮶䛯
䠄ᅗ 4䠈䛯䛰䛧䠈⌧ᆅㄪᰝ䛾ไ⣙䛺
䛹䛻䜘䜚䠈Ỉ䛚䜘䜃Ỉ㉁䛾䝕䞊䝍 䛻䛿Ḟ 䛜䛒䜛䠅䠊䛣䛣䛷䛿 2 ᅇ䛾 ㄪᰝ䝕䞊䝍䛜䛩䜉䛶ᥞ䛳䛶䛔䜛 69
⟠ᡤ䛾䜏䜢ᑐ㇟䛸䛧䛶䠈2003 ᖺ䝕 䞊䝍䛸 2005 ᖺ䝕䞊䝍䛾ẚ㍑䜢⾜䛳 䛯䠄⾲㻌 3.2䠅䠊ᆅୗỈ䠈pH䠈EC 䛾 䛔䛪䜜䜒್䛜ⱝᖸప䛟䛺䛳䛶䛔䜛 䛜䠈pH 䛸 EC 䛻䛴䛔䛶䛿䛝䛺ኚ
䛸䛿䛔䛘䛺䛔䠊ᆅୗỈ䛻䛴䛔 䛶䛿䠈2003 ᖺ䛾㝆Ỉ㔞䛜 506mm 䛺䛾䛻ᑐ䛧䠈2005ᖺᗘ䛜122mm䛸 ᑠ㞵䛷䛒䛳䛯䛣䛸䛻㉳ᅉ䛩䜛䛸⪃䛘
䜙䜜䜛䠊 Figure 3.4㻌 ༡㒊ᡞศᕸ䠄ᐇ㊶䛷ᅖ䜣䛰㒊ศ䛿 2003ᖺᗘ䛻ィ 䛧䛯ᡞ⩌ศᕸ㡿ᇦ䜢♧䛩䠊䠅
Figure 3.5䛛䜙3.7䛻ᑐ㇟㡿ᇦෆ䛾ᆅୗỈ䠈pH䠈EC䛾✵㛫ศᕸ䜢♧䛩䠊ᆅୗỈ
䛻䛴䛔䛶䛿䠈Ỉపୗ䛿ㄆ䜑䜙䜜䜛䛜䠈✵㛫ศᕸ䛾ഴྥ䛸䛧䛶䛿୧ᖺ䛻䛝䛺ᕪ䛿ぢ 䜙䜜䛪䠈༡㒊䛛䜙㒊䜈䛾ᆅୗỈὶື䛜䛒䜛䛣䛸䛜☜ㄆ䛷䛝䜛䠊୍᪉䠈EC䛾ศᕸ䜒䛭䜜 䜋䛹䛝䛺ᕪ䛿䛺䛔䛜䠈୍㒊䛻⸆ရᕤሙ䛾ᙳ㡪䛻䜘䜚ᒁᡤⓗ䛻್䛜㧗䛟䛺䛳䛶䛔䜛ᆅ
༊䛜☜ㄆ䛷䛝䜛䠊EC䛿ᆅୗỈ䜋䛹᫂░䛷䛿䛺䛔䛜䠈༡᪉ྥ䛷್䛾ᕪ␗䛜ぢ䜙䜜䜛 ศᕸഴྥ䛿♧䛧䛶䛚䜚䠈4.1⠇䛷᥎ᐹ䛧䛯ሷ㢮㍺㏦䛸ྠ䛨䛣䛸䛜⪃䛘䜙䜜䜛䠊䛺䛚䠈pH䛻 䛴䛔䛶䛿᫂☜䛺ഴྥ䛺䛹䛿ぢ䜙䜜䛺䛛䛳䛯䠊
Figure 3.5㻌 ᆅୗỈ㠃䠄ᕥഃ䠖’03䠈ྑഃ䠖’05䠅
Figure 3.6㻌 ECศᕸ䠄ᕥഃ䠖’03䠈ྑഃ䠖’05䠈 䕰䛿ᕤሙ䛾⨨䜢♧䛩䠅
3.4.2༡㒊ᆅ༊ᡞศᕸㄪᰝ䛚䜘䜃㎰ᆅㄪᰝ 37
2005ᖺ䛸2006ᖺ䛻⾜䛳䛯⪺䛝ྲྀ䜚ㄪᰝ䛾⤖ᯝ䛷䛿䠈ᡞ1⟠ᡤᙜ䛯䜚䛾㎰ᆅ㠃✚䛜
ᖹᆒ䛷2.9ha 䛻䛺䜚䠈䛺స≀䛿䠈䝖䜴䝰䝻䝁䝅䠈䜰䝃䠈䝇䜲䜹䛷䠈䛭䜜䛮䜜య䛾 67%䠈
15%䠈14%䜢༨䜑䛶䛔䜛䠊䛣䜜䜙䛿䠈䛔䛪䜜䜒⇱ᆅ䞉༙⇱ᆅ䛷䛿୍⯡ⓗ䛺స≀䛸䛔 䛘䜛䠊℺₅䛻䛴䛔䛶䛿ᅵ⾲㠃䛜䛔䛶䛝䛯䜙⾜䛖䛸䛔䛖䜘䛖䛻ឤぬⓗ䛻⾜䜟䜜䛶䛚䜚䠈᫂
☜䛺℺₅䛾つ๎䜔᪉㔪䛺䛹䛿䛺䛔䛜䠈ᥭỈ䛾ከ䛟䛿㟁Ẽ䝫䞁䝥䛻䜘䜚⾜䜟䜜䛶䛔䜛䛣䛸 䛛䜙䠈㟁Ẽ⏝㔞䛛䜙䜎䛛䛺℺₅Ỉ㔞䜢᥎ᐃ䛧䛯⤖ᯝ䠈⪺䛝ྲྀ䜚ㄪᰝ䛾ᑐ㇟㎰ᆅ
䠄744ha䠅䛷ᖺ㛫233m3䜢ᥭỈ䛧䛶䛔䜛䛸ィ⟬䛥䜜䛯䠊䛣䜜䜢℺₅ᮇ㛫䛷䛒䜛4䞄᭶㛫
䛷㝖䛩䜜䜀䠈༢㠃✚᪥ᥭỈ㔞䛜 2.6mm䡡day-1䡡m-2 䛻䛺䜛䛣䛸䛜ศ䛛䜛䠊䛯䛰䛧䠈2 ᖺ 㛫䛻Ώ䛳䛶䛾ㄪᰝ䛷䛒䛳䛯䛯䜑䠈ィ⟬䛷䛿ᖺᗘ䜢༊ู䛫䛪䛻䝕䞊䝍䜢⏝䛔䛯䠊
㻌ഃ䛻䛒䜛 S17ᆅⅬ䛾ᅵተ䛿䠈70cm 䜎䛷䛾ᅵᒙ䛷⣙80%䜢⣽◁䠄0.02-0.2 mm䠅䠈⣙
10%䜢䝅䝹䝖䠄0.002-0.02 mm䠅䠈ṧ䜚䜢⢓ᅵ䠄0.002mm ௨ୗ䠅䛜༨䜑䠈70cm ௨῝䛾ᅵᒙ 䛷䛿䠈⣙5%䛜⢒◁䠄0.2-2 mm䠅䠈⣙55%䛜⣽◁䠈⣙10%䛜䝅䝹䝖䠈⣙30%䛜⢓ᅵ䛸䛺䛳 䛶䛔䛯䠊༡ഃ䛻䛒䜛S18ᆅⅬ䛷䛿䠈䛩䜉䛶䛾ᒙ䛷䠈⣽◁䛜⣙80%䠈䝅䝹䝖䛜⣙10%䠈⢓
ᅵ䛜⣙ 10%䛷䛒䛳䛯䠊䛔䛪䜜䛾ᆅⅬ䜒ᴟᗘ䛻⢏ᚄศᕸ䛜೫䛳䛯ᅵተ䛷䛒䜚䠈S17 ᆅⅬ 䛾 70cm ௨῝䛿◁㉁ᇰᅵ䛻ศ㢮䛥䜜䜛䛜䠈䛭䛾䛿䛩䜉䛶⣽◁ተᅵ䛸䛔䛖ᅵᛶ䛻༊ศ 䛥䜜䜛䠊㻌
㻌S17 ᆅⅬ䛷䛾ᥭỈヨ㦂䛷䛿䠈0.0111m3䡡s-1䛾ྜ䛷 24㛫䛾ᥭỈ䜢⾜䛔䠈ྠ䛻ᥭ Ỉ䛸䛭䛾࿘ᅖ䛻䛒䜛ほ 2 ⟠ᡤ䠄ᥭỈ䛛䜙䛾㊥㞳䛜䛭䜜䛮䜜 r1=12.7m 䛸 r2=101m䛷䛒䜛ほ Y1䛸Y2䠅䛷1ศ㛫㝸42㛫䛾ᆅୗỈ䜢 ᐃ䛧䛯䠊䛿䛨䜑䛻
Figure 3.7㻌 pHศᕸ䠄ᕥഃ䠖’03䠈ྑഃ䠖’05䠈 䕰䛿ᕤሙ䛾⨨䜢♧䛩䠅
24 㛫䛾ᥭỈ䛷ᆅୗỈ䛜ᐃᖖ≧ែ䛻䛺䛳䛶䛔䜛䛸௬ᐃ䛧䠈ほ Y1 䛸 Y2 䛾Ỉ
(䛭䜜䛮䜜h1䠈h2)䛛䜙ḟᘧ䜢⏝䛔䛶㏱Ỉಀᩘk[m䡡s-1]䜢ィ⟬䛧䠈Thiem䛾εἲ䠄Ⲩᮌ䞉ᳺ, 1962䠅䜢⏝䛔䛶䠈k=8.29㽢10-5m䡡s-1䛾್䜢ᚓ䛯䠊㻌
㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌
1 2 2 1 2 2
ln r r h h k Q
S 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 (1)
⥆䛔䛶䠈㐃⥆ィ 䛧䛯పୗỈ㔞䛛䜙 Theis 䛾Ỉపୗἲ䠄㎰ᴗᅵᮌᏛ, 1989䠈Ⲩ ᮌ䞉ᳺ, 1962)䜢⏝䛔䛶㏱Ỉ㔞ಀᩘT[m2䡡s-1]䛸㈓␃ಀᩘ䜢ồ䜑䛯䛸䛣䜝䠈T= 4.06㽢10-3 m
2䡡s-1 䠈S=3.64㽢10-3 䛸䛺䛳䛯䠊䛣䜜䜢㏱Ỉᒙ䜎䛷䛾ึᮇỈ䠄H=10.8m 䛸᥎ᐃ䠅䛷㝖 䛩䜛䛸㏱Ỉಀᩘk䛿 3.76㽢10-4m䡡s-1䛸䛺䜚䠈Thiem䛾 εἲ䛾⤖ᯝ䛸ẚ䜉䜛䛸䜔䜔䛝䛺
್䛸䛺䛳䛯䠊 NᆅⅬ䛾ᖹᆒ⢏ᚄ䛷䛒䜛0.04mm⛬ᗘ䛾ሙྜ䠈㏱Ỉಀᩘk䛿5.0㽢10-5m䡡 s-1䛛䜙1.9㽢10-4m䡡s-1䛷䛒䜛䛯䜑䠄ᮏ㛫, 1984䠅䠈Theis䛾Ỉపୗἲ䛻䜘䜛್䛿㐣䛷 䛒䜛䛸⪃䛘䜙䜜䜛䠊䛣䛾⌮⏤䛸䛧䛶䛿Y1䛸Y2䛷䛾ほ ್䛜ྠ୍⥺ୖ䛻䝥䝻䝑䝖䛥䜜䛶䛔 䛺䛔䛣䛸䛻䜘䜛ㄗᕪ䛸ほ 䛾῝䛥䛜㏱Ỉᒙ䜎䛷฿㐩䛫䛪䠈H 䜢㐣ᑠホ౯䛧䛶䛔䜛ྍ
⬟ᛶ䛜⪃䛘䜙䜜䜛䠊
3.4.3 ᰝ༡㒊ᆅ༊ᆅୗỈ㔞䛾᥎ᐃ䛸ቑῶ㻌
㻌 ⪺䛝ྲྀ䜚ㄪᰝ䛻䜘䜜䜀䠈༡㒊ᆅ༊䛷䛿ᅽᖏỈᒙ䛛䜙䛾ᥭỈ䛜䛷䠈⿕ᅽᖏỈᒙ䛿 䛒䜎䜚⏝䛥䜜䛶䛔䛺䛔䠊䛣䛣䛷䛿༡㒊ᆅ༊ ᐃᆅⅬ䛻ᅖ䜎䜜䛯㡿ᇦෆ䛾ᅽᖏỈᒙ 䛻ྵ䜎䜜䜛ᆅୗỈ㔞䜢2003ᖺ䛛䜙2006ᖺ䜎䛷䛾ᆅୗỈ䝕䞊䝍䛸2003ᖺᗘ䛻ィ 䛧 䛯㏱Ỉᒙ䜎䛷䛾῝ᗘ䜢ᇶ䛻᥎ᐃ䛧䛯䠊䛺䛚䠈᪤Ꮡᡞ⏝䛾 ᐃᆅⅬ䛒䜛䛯䜑㏱
Ỉᒙ䜎䛷䛾῝ᗘ䛚䜘䜃Ḟ 䛧䛶䛔䜛ᆅୗỈ䛻䛴䛔䛶䛿࿘ᅖ䛾 ᐃⅬ䛾್䛛䜙ෆᤄ䛧 䛯䠊ᆅୗỈ㔞䛾᥎ᐃ᪉ἲ䛿 ᐃᆅⅬ 16 ⟠ᡤ䜢⧅䛞䠈୕ゅᙧ⥙䜢సᡂ䛧䛯ᚋ䠈ḟᘧ䜢
⏝䛔䛯䠊
㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌
¦
nk Ak hk zk
V
1
O 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 (2)
䛯䛰䛧䠈V 䛿㡿ᇦෆ䛾ᆅୗỈ㔞䠈A 䛿୕ゅᙧせ⣲䛾㠃✚䠈h䛿せ⣲ෆ䛾ᆅୗỈ㠃䛾ᖹ ᆒᶆ㧗䠈z䛿せ⣲ෆ䛾㏱Ỉᒙ㠃䛾ᖹᆒᶆ㧗䠈λ 䛿㛫㝽⋡䠈n 䛿せ⣲ᩘ(=21)䛷䛒䜛䠊 䛺䛚䠈㛫㝽⋡䛿S17 ᆅⅬ䛻䛚䛡䜛2.5m῝䛾ᅵተ䛾⇱ᐦᗘ䛸ᗘ⢏Ꮚᐦᗘ䛛䜙⟬ฟ䛧 䛯䠊⾲ 3.3䛿ᚓ䜙䜜䛯ᖺᖹᆒᆅୗỈ㔞䛸ᖺ㛫㝆Ỉ㔞䜢♧䛧䛶䛔䜛䠊
⾲ 3.3: ༡㒊ᆅ༊ᖺᖹᆒᆅୗỈ㔞䛸ᖺ㛫㝆Ỉ㔞
ᖺᗘ ᖺᖹᆒᆅୗỈ㔞(㽢107 m3) ᖺ㛫㝆Ỉ㔞(mm)
2003 7.05 506
2004 6.98 427
2005 6.72 122
2006 6.35 N/A
3.4.4㒊ᆅ༊ᆅୗỈㄪᰝ 39 㻌
ᆅୗỈ㔞䛿2003ᖺ௨㝆ῶᑡഴྥ䛻䛒䜛䛜䠈2005 ᖺཬ䜃2006ᖺ䛻㛵䛧䛶䛿䠈2005ᖺ 䛜ᴟᗘ䛾ᑠ㞵䛷䛒䛳䛯䛣䛸䛻㉳ᅉ䛩䜛䛸⪃䛘䜙䜜䜛䠊䛭䛾䛯䜑䠈≉䛻ῶᑡ䛜㢧ⴭ䛺 2006 ᖺᗘ䜢㝖䛔䛯ᮇ㛫䛾ᖹᆒ್ 6.92㽢107m3 ⛬ᗘ䛜㡿ᇦෆᖺᖹᆒᆅୗỈ㔞䛸䛧䛶ጇᙜ䛺
್䛷䛒䜝䛖䛸᥎ᐃ䛧䛯䠊䛯䛰䛧䠈㏆ᖺ䛾⇱ᆅ䞉༙⇱ᆅ䛷䛿ᾰ㣴㔞䜢㉸䛘䛯ዣⓗᥭ Ỉ䛜ၥ㢟ど䛥䜜䛶䛔䜛䛣䛸䛛䜙䠈ᮏᆅᇦ䛻䛚䛔䛶䜒⥅⥆䛧䛯ほ 䛜ྍḞ䛷䛒䜛䠊
3.4.4 㒊ᆅ༊ᆅୗỈㄪᰝ㻌
Figure 3.8 䛿㒊ᆅ༊䛾௦⾲ⓗ䛺ᆅⅬ䠄N1䠈N2䠈N3䠈N5䠈N6䠈N8䠈N9䠈N12䠈N13䠈 N14䠅䛻䛚䛡䜛ᆅ⾲㠃䛛䜙䛾ᆅୗỈኚື䛸᭶㝆Ỉ㔞䜢♧䛧䛯䜒䛾䛷䛒䜛䠊℺₅ᮇ䛻䛒 䛯䜛5᭶䛛䜙8᭶䛻䛿
℺₅䛻䜘䜛䜒䛾䛸ᛮ䜟 䜜䜛ᆅୗỈపୗ䛜
⯡ⓗ䛻ぢ䜙䜜䠈䛸䜚 䜟䛡N2䠈N6䠈N8䠈N14 䛺 䛹 䛻 䛚 䛔 䛶 䛭 䛾 ഴ
ྥ䛜㢧ⴭ䛷䛒䜛䛜䠈ᮾ 䜘 䜚 䛾 N1䠈N5䠈N9䠈
N12䠈N13 䛻䛚䛔䛶䛿
䛭䛾పୗ㔞䛿䛤䛟䜟䛪 䛛䛷䛒䜛䠊䛣䛾䛣䛸䛿䠈
㒊ᆅ༊䛻䛚䛔䛶す ᐤ䜚䛻㎰ᆅ䛜ከ䛔䛣䛸 䛻㉳ᅉ䛧䛶䛔䜛䜒䛾䛸
⪃䛘䜙䜜䜛䠊 䜎䛯䠈㞵 Ꮨ䠄㏻ᖖ䛿7᭶䛛䜙9᭶䛷䛒䜛䛜䠈2005ᖺ䛿10᭶䛻䜒ከ䛟䛾㝆Ỉ䛜ぢ䜙䜜䛯䛯䜑䠈䛣䛣 䛷䛿 7᭶䛛䜙 10᭶䛸䛩䜛䠅䛻䛿䛒䜛⛬ᗘ䜎䛸䜎䛳䛯㝆Ỉ䛜ぢ䜙䜜䜛䛜䠈ᆅୗỈ䛾グ㘓 䛜᭶ẖ䛷䛒䜛䛯䜑䛛䠈ᆅୗỈ䛻ᑐ䛩䜛᫂☜䛺ᙳ㡪䛿ぢ䜙䜜䛺䛔䠊
2005ᖺ4᭶䛛䜙12᭶䜎䛷䛾㒊ᆅ༊䛾ᆅୗỈ㠃ᶆ㧗䛻༡㒊ᆅ༊䛾ᆅୗỈ㠃ᶆ㧗 䜢ຍ䛘䛯✵㛫ศᕸ䜢Figure 3.9䛛䜙3.11䛻♧䛩䠊㒊ᆅ༊ഃ䛾ᆅୗỈ㠃ᶆ㧗䛿ᖺ㛫 䜢㏻䛨䛶㒊ᆅ༊䛜᥋䛩䜛㯤Ἑ䛾Ỉ㠃ᶆ㧗(⣙ 998m䡚1,000m)䜘䜚䜒ప䛟䠈ᆅୗỈ䛜㯤 Ἑ䜘䜚ᾰ㣴䛥䜜䛶䛔䜛䛣䛸䜢♧၀䛧䛶䛔䜛䠊䜎䛯䠈༡㒊ᆅ༊䛿᫂䜙䛛䛻㒊ᆅ༊䜘䜚䜒ᆅ
ୗỈ㠃䛜㧗䛟䠈༡㒊䛾䜾䝥䝏◁₍ᆅᇦ䛛䜙䛾ᾰ㣴䛜⪃䛘䜙䜜䜛䠊ຍ䛘䛶䠈㒊ᆅ༊䛾
୰ኸ䛛䜙༡ᐤ䜚䛾㎶䜚䛷ᆅୗỈ㠃ᶆ㧗䛿᭱ప䛻䛺䛳䛶䛔䜛䛣䛸䛛䜙䠈䛣䛾㎶䜚䛜㯤Ἑ䛛䜙 䛾ᾰ㣴䛸䜾䝥䝏◁₍ᆅᇦ䛛䜙䛾ᾰ㣴䛾ቃ⏺䛻䛺䛳䛶䛔䜛䛣䛸䛜᥎ᐃ䛥䜜䜛䠊ᆅୗỈὶ䛿
Figure 3.8㻌 㒊ᆅ༊䛻䛚䛡䜛ᆅୗỈ䛾ኚື䛸㝆Ỉ㔞
༡㒊䛛䜙୰ኸ㏆䛷ᮾྥ䛝䛾ὶ䜜䛸䛺䜛䛯䜑䠈ᆅୗỈ䛿䛭䛾ከ䛟䛜㡿ᇦ䛛䜙ὶฟ䛧䛶䛔 䜛䛜䠈ᙜヱ㡿ᇦ䛾ᮾഃ䜒䜋䜌ྠᵝ䛾ᅵᆅ⏝䛜⥆䛟䛣䛸䛛䜙䠈㯤Ἑཬ䜃䜾䝥䝏◁₍䛾 ୧⪅䛛䜙ᾰ㣴䛥䜜䛯ᆅୗỈ䛾ከ䛟䛿᭱⤊ⓗ䛻ᥭỈ䛥䜜䛶⏝䛥䜜䛶䛔䜛䜒䛾䛸᥎ᐹ䛥䜜 䜛䠊䛺䛚䠈4.3 ⠇䛷ᚓ䜙䜜䛯㏱Ỉಀᩘ䛸ᐇ 䛥䜜䛶䛔䜛㏱Ỉᒙ䜎䛷䛾῝ᗘ䛸ᆅୗỈ
䜢⏝䛔䛶䠈䛥䜙䛻㏱Ỉᒙ䜎䛷䛾῝ᗘ䜢௬䛻༡㒊ᖹᆒ䛸ྠ䛨䛸䛧䛯ሙྜ䛾ほ 䛷 ᅖ䜎䜜䜛㡿ᇦ䜈䛾ὶฟධ㔞䜢ᴫ⟬䛧䛯⤖ᯝ䠈ᖺ㛫 2.30㽢105m3 䛸䛾ὶฟ䛸䛺䛳䛯䠊䜎䛯䠈 㡿ᇦ䛾㒊䛸༡㒊䜢䛭䜜䛮䜜㯤Ἑཬ䜃䜾䝥䝏◁₍䛛䜙䛾ᾰ㣴㔞䛷䛒䜛䛸᥎ᐃ䛧䛯ሙྜ䠈 䛭䜜䜙䛾ᾰ㣴㔞䛿ᖺ㛫7.33㽢104m3䛸ᖺ㛫5.87㽢105m3䛸䛺䛳䛯䠊
Figure 3.9 ᆅୗỈ䛸ὶື䠄ᕥഃ䠖4᭶䠈ྑഃ䠖6᭶䠅
3.4.4㒊ᆅ༊ᆅୗỈㄪᰝ 41
Figure 3.10 ᆅୗỈ䛸ὶື䠄ᕥഃ䠖8᭶䠈ྑഃ䠖10᭶䠅
Figure 3.11 ᆅୗỈ䛸ὶື䠄ᕥഃ䠖12᭶䠈ྑഃ䠖4᭶䛛䜙⩣ᖺ1᭶䜎䛷䛾ᖹᆒ䠅
3.5 㻌 䜎䛸䜑㻌
㻌2001ᖺ䛛䜙2006ᖺ䛻䜟䛯䜚ෆⵚྂ⮬༊㐩ᢼ≉䛾ቸἙὶᇦ䛻䛚䛡䜛ᆅୗỈ䛾
⌧≧䛸⏝䜢ㄪᰝ䛧䛶䛝䛯䠊䛭䛾⤖ᯝ䠈ᆅᇦ䛾ᆅୗỈ䛿䠈㯤ἙἈ✚ᖹཎᆅᇦ༡㒊ᆅ༊
䛻䛚䛔䛶䛿ୣ㝠ᆅᇦ䠈䜽䝤䝏◁₍ᆅᇦ䛛䜙䛾ᾰ㣴䠈㒊ᆅ༊䛻䛚䛔䛶䛿㯤Ἑ䛛䜙䛾ᾰ 㣴䛜⪃䛘䜙䜜䠈ほ 䛷ᅖ䜎䜜䛯㡿ᇦ䜢ᑐ㇟䛻䛧䛯ሙྜ䠈ᖺ㛫⣙ 6.61㽢105m3 䛾ᾰ㣴 Ỉ㔞䛻䛺䜛䛣䛸䛜♧၀䛥䜜䛯䠊㡿ᇦయ䛸䛧䛶䛿ᮾഃ䜈䛾ὶฟ䛜䛝䛟䠈ᨭ䛿㈇䛸䛺 䛳䛶䛔䜛䛜䠈䛣䛾ᆅᇦ䛾ᆅୗỈ⏝䛾≧ἣ䛜䜾䝥䝏◁₍ᆅᇦ䛾ᆅୗỈὶື䛚䜘䜃㯤 Ἑ䛛䜙䛾ᾐ㏱ὶ䛻䛝䛺ᙳ㡪䜢䛘䛶䛔䜛䜒䛾䛸⪃䛘䜙䜜䜛䠊
㻌༡㒊ᆅ༊䛷䛿䠈℺₅䛺䛹䛻㉳ᅉ䛩䜛 EC 䛾ୖ᪼䛜☜ㄆ䛷䛝䛶䛚䜚䠈ᕤሙ䛛䜙䛾Ỉ䜔
㎰ᆅ䛻䛚䛡䜛⫧䛺䛹䛾⟶⌮䛜ᚋ䛿୍ᒙ㔜せ䛻䛺䜛䜒䛾䛸⪃䛘䜙䜜䜛䠊䜎䛯䠈ྠᆅ༊
䛾ほ 䛷ᅖ䜎䜜䛯㡿ᇦෆ䛾ᅽᆅୗỈ㈨※䛿 6.92㽢107m3䠈༢㠃✚ᙜ䛯䜚䛷䛿
3.88m䛸᥎ᐃ䛥䜜䠈⇱ᆅ䛸䛧䛶䛿䛝䛺Ỉ㔞䜢᭷䛧䛶䛔䜛䛣䛸䜒᫂䜙䛛䛸䛺䛳䛯䠊୍᪉䛷䠈
2005ᖺ䛾ᑠ㞵䛾ᙳ㡪䜒䛒䜛䛜䠈ほ ᮇ㛫䛾ᆅୗỈ㔞䛿ῶᑡഴྥ䛻䛒䜚䠈ᣢ⥆ⓗ䛺⏝
ྍ⬟ᛶ䛜ᠱᛕ䛥䜜䜛䠊⌧ᅾ䠈↓ᩘ䛸䛔䛳䛶Ⰻ䛔䜋䛹䛾ᡞ䛸䛭䛾ᥭỈ㔞䛿ᙜ⪅௨እ 䛻䛿䛟䛾䝤䝷䝑䜽䝪䝑䜽䝇䛻䛺䛳䛶䛚䜚䠈ᆅᇦ♫䛸䛧䛶⟶⌮䛩䜛᪉ἲ䜢᳨ウ䛩䜛ᚲせ 䛜䛒䜛䠊ᅇ䛾䝕䞊䝍䛿㝈䜙䜜䛯ᮇ㛫䛾䜒䛾䛾䜏䛷䛒䜚䠈ቸἙὶᇦ䛾ᆅୗỈ䜢 䛩䜉䛶᫂䜙䛛䛻䛧䛯䜒䛾䛷䛿䛺䛔䠊ᆅୗỈ㔞䠈Ỉ㉁䛸䜒䛻ᚋ䛾⥅⥆䛧䛯ほ 䛜ồ䜑䜙 䜜䜛䠊
ᘬ⏝ᩥ⊩
[1] Akiyama, T. and K. Kawamura (1997): Grassland degradation in China: Methods of monitoring management and restoration, Grassland Science, 53(1), pp.1-17.
[2] Ⲩᮌṇኵ䞉ᳺᮾ୍㑻 (1962): Ỉ⌮Ꮫ₇⩦ୗᕳ䠈᳃ฟ∧䠈pp.307-310䠊
[3] Cao, S., Chen, L. and Yu, X. (2009): Impact of China’s Grain for Green Project on the landscape of vulnerable arid and semi-arid agricultural regions: a case study in northern Shaanxi Province, J. of Applied Ecology, 46, pp.536-543.
[4] ᮏ㛫ோ(1984): ᶆ‽Ỉ⌮Ꮫ䠈ၿ䠈p.85.
[5] ୍䝜℩ಇ᫂䞉ᆤᅜ㡰䞉⋤Ꮫ䞉ᙇ♽㝣䞉⾰➟⪽ྐ (2005): 㯤Ἑὶᇦ䛻䛚䛡䜛 ᆅୗỈ⏝䛾⌧≧ᢕᥱ䛸ᑗ᮶ண ᡭἲ䛾㛤Ⓨ䠈䛄୰ᅜ䛻䛚䛡䜛⎔ቃၥ㢟䛾⌧
≧䛅䠈ឡ▱Ꮫᅜ㝿୰ᅜᏛ◊✲䝉䞁䝍䞊䠈pp.259-266.