［5-05］ H27 農業農村工学会大会講演会講演要旨集 ࢜ࢥࡢⓎ⏕ࡍࡿࡓࡵụ࠾ࡅࡿᰤ㣴ሷ㢮ࡢቑຍせᅉ㛵ࡍࡿ᳨ウ Factors in the increase of nutrient salts in a small reservoir with blooms of Blue Green Algae ۑᮧୖ༓ᫎ* ୕ᾆ᪩⧊** ℊୖ㑥ᙪ*** Chihayu Murakami Saori Miura Kunihiko Hamagami 1.ࡣࡌࡵ ㏆ᖺࠊࡓࡵụࡣ⟶⌮యไࡢ⬤ᙅࡸ⏕ά㞧Ỉࡢὶධࡼࡾࠊᐩᰤ㣴ࡼࡿỈ㉁ᝏࡀၥ㢟 ࡞ࡗ࡚࠸ࡿࠋࡑࡢၥ㢟ࡢ୍ࡘࠊ࢜ࢥࡢⓎ⏕ࡀ࠶ࡿࠋ࢜ࢥࡀⓎ⏕ࡍࡿࠊ⊂≉࡞␗⮯ࠊ㨶㢮ᩢ Ṛࠊᬒほࡢᝏ࡞ࡀᘬࡁ㉳ࡇࡉࢀࠊ㎰ᴗ⏝Ỉࡢ౪⤥ࡢࠊࡓࡵụࡀᣢࡘᵝࠎ࡞ᶵ⬟ࢆ༑ศⓎ ࡍࡿࡇࡀᅔ㞴࡞ࡿࠋ ࡓࡵụࡢከ㠃ⓗᶵ⬟ࡋ࡚ࡣࠊỈ㫽ࡢ㉺ᆅࠊぶỈຠᯝࡢฟࠊᬒほᙧᡂࡢᙺ࡞ࡀ࠶ࡾࠊࡇ ࢀࡽࡣ⊂❧ࡋ࡚࠾ࡽࡎࠊ࠼ࡤỈ㫽ࡀ㣕᮶ࡍࡿࡓࡵụ࡛ࡣࠊぶỈຠᯝࠊᬒほᙧᡂࡢຠᯝࡀቑຍࡍࡿ ⪃࠼ࡽࢀࡿࠋࡋࡋࠊከᩘࡢỈ㫽ࡀ⏕ᜥࡍࡿሙྜࠊ⣅ࡼࡿᰤ㣴ሷࡢ㈇Ⲵࡀቑࡍࡿྍ⬟ᛶࡀ࠶ ࡿࠋࡑࡇ࡛ᮏ◊✲࡛ࡣࠊ࢜ࢥࡢⓎ⏕ࡍࡿࡓࡵụ࠾ࡅࡿᰤ㣴ሷࡢቑຍせᅉ㛵ࡍࡿ᳨ウࢆ⾜࠺ࡇ ࢆ┠ⓗࡋࠊὶධỈࠊᗏἾࡽࡢ⁐ฟຍ࠼ࠊỈ㫽ࡢ⣅ࡽࡢ㈇Ⲵ㔞ࡢ᥎ᐃࢆ⾜ࡗࡓࠋ 2.ㄪᰝᑐ㇟ᆅ࣭ㄪᰝෆᐜࡑࡢᴫせ ㄪᰝᑐ㇟ᆅࡣࠊ┒ᒸᕷ⨨ࡍࡿ㧗ᯇࡢụ࡛࠶ࡿࠋ Fig.1 㧗ᯇụࡢᴫせほ ᆅⅬࢆ♧ࡋࡓࠋᏘࡢ Ỉ㫽ࡢ㣕᮶ࡀ᭷ྡ࡞ࡓࡵụ࡛࠶ࡿࡀࠊኟࡽ⛅ ࡅ࡚ࡣ࢜ࢥࡢⓎ⏕ࡀぢࡽࢀࠊỈ㉁ᨵၿࡸಖࡀㄢ 㢟࡛࠶ࡿࠋ ᐃᮇ㛫ࡣ 2014/08/04㹼࡛࠶ࡿࠋ ᐃ㡯 ┠࣭ ᐃ᪉ἲ㛵ࡋ࡚ࡣࠊ᳜≀ࣉࣛࣥࢡࢺࣥ㔞ࡣከ Ἴ㛗ບ㉳⺯ගගᗘィࢆ⏝࠸࡚ࠊỈ ࠊpHࠊDO ࡣ pH࣭DO ィࢆ⏝࠸࡚⌧ᆅほ ࢆ⾜ࡗࡓࠋTNࠊNH4-Nࠊ TPࠊPO4-PࠊNO3-NࠊNO2-NࠊTOC ࡣྛᆅⅬ࡛᥇ ྲྀࡋࡓỈࢆᐇ㦂ᐊ࡛ࡑࢀࡒࢀศᯒࡋࡓࠋࡲࡓ㸪Ỉ㫽 ࡢ㣕᮶ᩘࢆᐃᮇほ ࡢ㝿㝶☜ㄆࡋࠊ㣕᮶ᩘࡀቑ ຍࡋࡓ 12 ᭶௨㝆ࡽ┠どࡼࡿಶయᩘࡢィ ࢆ⾜ ࡗࡓࠋほ ᆅⅬࡣᆅⅬ A ㏆࡛࠶ࡿࠋ 3.ྛ᳨ウ㡯┠ࡢ⟬ฟ᪉ἲࡑࡢ⤖ᯝ 3-1 TP࣭TN࣭ࣛࣥ⸴㢮ࡢ᥎⛣ࡢẚ㍑ Fig.2 TP࣭TN࣭ࣛࣥ⸴㢮ࡢ᥎⛣ࢆ♧ࡍࠋᆅⅬ ẖࡢࡁ࡞ᕪࡣ↓࠸ࠋ୍᪉ TP ࡣࠊ8 ᭶ᚋ༙ࣆ࣮ ࢡࢆ㏄࠼ࠊ10 ᭶ࡽ 11 ᭶ࡅ࡚ῶᑡࡋࠊࡑࡢᚋ ࡲࡓ⃰ᗘࡀୖ᪼ࡋ࡚࠸ࡿࠋࡑࢀࡒࢀࢆ㎰ᴗ⏝Ỉᇶ‽ ẚ㍑ࡍࡿ TN ࡣᇶ‽๓ᚋኟᏘࡣࡁࡃୖᅇ ࡿࠋࡇࡢࡇࡽ㧗ᯇࡢụ࡛ࡣࠊ❅⣲ࡀᐩᰤ㣴≧ែ ࡛࠶ࡿゝ࠼ࡿࠋ 3-2 ὶධࡼࡿ TP࣭TN ㈇Ⲵ㔞 ὶධࡼࡿ㈇Ⲵ㔞ィ⟬ࡣ௨ୗࡢ㡰࡛⾜ࡗࡓࠋ ձ㞟Ỉᇦ㸦1.9 㸧ࢆ 4 ࡘ(ᒇ᰿ࠊᛴ࡞ᒣᆅࠊ⦆࠸ᒣ ᆅࠊⰪ࣭ᶞᮌ)ࡢᆅᙧศ㢮 *ᒾᡭᏛᏛ㝔㎰Ꮫ◊✲⛉ Graduate school of Agriculture,Iwate University, **ᐑᇛ┴ Miyagi Prefectural Office ,***ᒾᡭᏛ㎰Ꮫ㒊 Faculty of Agriculture,Iwate University, ࣮࣮࢟࣡ࢻ㸸ᐩᰤ㣴, ࢜ࢥ㸪㈇Ⲵ㔞㸪ᰤ㣴ሷ㢮㸪Ỉ㫽ࡢ⣅ − 520 − ղ᥇Ỉ๓ᚋ 1 㐌㛫࡛⃰ᗘࡀ୍ᐃ௬ᐃࡋࠊ ❅⣲⃰ᗘ㞵㔞ὶฟಀᩘࡽ 2 㐌㛫ࡢ❅⣲ ὶධ㔞ࢆ⟬ฟ ճ㸯ᖺ㛫࠶ࡓࡾࡢὶධ㔞ࢆ⟬ฟ 2 㐌㛫࠶ࡓࡾࡢ TP࣭TN ㈇Ⲵ㔞ࡢ᥎⛣ࢆ Fig.3 ♧ࡍࠋࡇࢀࢆ⏝ࠊTP࣭TN ࡑࢀࡒࢀࡢ 1 ᖺ㛫 ࠶ ࡓ ࡾ ࡢ ㈇ Ⲵ㔞 ࡣ ࠊ TP ࡣ 7.46kg ࠊ TN ࡣ 1.04×103kg ⟬ฟࡋࡓࠋ 3-3 㫽ࡢ⣅ࡼࡿ❅⣲㈇Ⲵ㔞 Ỉ㫽ࡢ⣅ࡀỈ୰࡛ศゎࡉࢀࡿ❅⣲ࡢ㔞ࢆ௨ୗ ࡢ⟬ฟᘧࡼࡾồࡵࡓࠋ BL = Cr × N × DW × NC (1) ࡇࡇ࡛ࠊBL(g/d)ࡣ❅⣲㈇Ⲵ㔞ࠊCr ࡣỈ㫽ࡢ⣅ ྵࡲࢀࡿᰤ㣴ሷࡀỈ୰ᖐ╔ࡍࡿ☜⋡ࠊN ࡣỈ 㫽ࡢᩘࠊW(g/d)ࡣ 1 ᪥ᙜࡓࡾࡢỈ㫽ࡢ⣅ࡢ㔜ࠊ NC ࡣ⣅ྵࡲࢀࡿ TP(TN)ࡢྜࡋࡓࠋCrࠊ WࠊNC ࡣ᪤ ࡢㄽᩥࢆཧ⪃ࡋࠊN ࡣ⌧ᆅ࡛㣕 ᮶ᩘࡢ ᐃࢆ⾜࠸ࠊⓑ㫽ࡑࡢࡢ࢝ࣔ㢮ࡑࢀ ࡒࢀࡢ㈇Ⲵ㔞ࢆồࡵࡓࠋ⏝ࡋࡓ್ࡣ Table 1 ♧ࡋࡓࠋ⤖ᯝࠊTP ࡣ 1 ᖺ㛫࠶ࡓࡾ 7.87kgࠊ TN ࡣ 34.82kg ⟬ฟࡋࡓࠋ 3-4 ࣜࣥ❅⣲ࡢ⪃ᐹ Table 2 ࡣ᳨ウ㡯┠ࡽ⟬ฟࡋࡓࣜࣥ㈇Ⲵࡢ ẚ㍑ࢆ♧ࡋ࡚࠸ࡿࠋࣜࣥ㛵ࡋ࡚ࠊ㫽ࡢ⣅ࡼ ࡿࣜࣥ㈇Ⲵὶධࡽࡢ㈇Ⲵࡣྠ⛬ᗘࡲࡓࡣ㫽 ࡢ⣅ࡼࡿᙳ㡪ࡀࡁ࠸ࡇࡀศࡿࠋࡲࡓࠊ ࢜ࢥⓎ⏕ࡢไ㝈ᅉᏊࡣࠊᑐ㇟ụ࠾࠸࡚❅⣲ ࡢ್ࡣᖺ㛫ࢆ㏻ࡋ࡚㧗ࡃࠊࣜࣥࡢ್ࡀప࠸ࡇ ࡽ࡛ࣜࣥࡣ࡞࠸⪃࠼ࡽࢀࡿࠋTable 3 ࡣ᳨ ウ㡯┠ࡽ⟬ฟࡋࡓ❅⣲㈇Ⲵࡢẚ㍑ࢆ♧ࡋ࡚࠸ ࡿࠋ❅⣲㛵ࡋ࡚ࠊὶධ࣭㫽ࡢ⣅⏤᮶ࡢ❅⣲ࡀ ᗏἾሁ✚ࡋࠊᗏἾࡽࡢ⁐ฟᙳ㡪ࡀ࠶ࡿࡇ ࢆ㋃ࡲ࠼ࡿࠋࡇࢀࡲ࡛ࡢ⤖ᯝࡽὶධࡼࡿ TN ㈇ⲴࡣỈ୰࡛ศゎࡉࢀࡿ㫽ࡢ⣅ࡼࡿ TN ㈇Ⲵẚ㍑ࡋ࡚ࡁ࠸ࡇࡀศࡿࠋࡋࡓࡀࡗ࡚㧗ᯇ ࡢụ࡛ࡣࠊ❅⣲㛵ࡋ࡚ὶධࡼࡿ㈇Ⲵࡢᙳ㡪ࡀࡁࡃࠊ⁐ฟࡋࡓ NH4-N ࡢከࡃࡣụෆ࡛ᚠ⎔ࡋ࡚ ࠸ࡿ⪃࠼ࡽࢀࡿࠋ 4 ࡲࡵ ⌧ᆅほ ࢆ⾜ࡗࡓ⤖ᯝࠊ❅⣲࣭ࣜࣥࡑࢀࡒࢀ㛵ࡋ࡚ࠊᙳ㡪ࡀࡁ࠸㈇Ⲵ㡯┠ࢆ⟬ฟࡍࡿࡇࡀ ฟ᮶ࡓࠋᰤ㣴ሷࡢቑຍせᅉࡢ࠺ࡕࠊ❅⣲㛵ࡋ࡚ᙳ㡪ࡀࡁ࠸ࡢࡣὶධࡼࡿ㈇Ⲵ࡛࠶ࡿࠋࡲࡓὶ ධࡋࡓ❅⣲ࡸỈ㫽ࡢ⣅ࡀᗏἾࡓࡲࡾࠊࡑࡢᚋ⁐ฟࡍࡿ㔞ࡀከ࠸ࡇࡀࠊ❅⣲⃰ᗘࡀᜏᖖⓗ㧗࠸ ⌧ᅾࡢ㧗ᯇࡢụࡢ≧ែࡘ࡞ࡀࡗ࡚࠸ࡿ⪃࠼ࡽࢀࡿࠋ࢜ࢥⓎ⏕ࡢไ㝈ᅉᏊ⪃࠼ࡽࢀࡿࣜࣥ 㛵ࡋ࡚ᙳ㡪ࡀࡁ࠸ࡢࡣỈ㫽ࡢ⣅ࡼࡿ㈇Ⲵ࡛࠶ࡾࠊỈ㉁ᨵၿࢆ⪃࠼ࡿ࠺࠼࡛Ỉ㫽ࡢᙳ㡪ࢆ⪃៖ࡍ ࡿࡇࡀྍḞ࡛࠶ࡿゝ࠼ࡿࠋᚋࡣᖺ㛫ࢆ㏻ࡋ࡚⁐ฟヨ㦂ࡸᐃᮇほ ࢆ㏻ࡋ࡚ࠊࡼࡾ⢭ᗘࡢ㧗 ࠸᥎ᐃࢆ⾜࠺ᚲせࡀ࠶ࡿࠋ ཧ⪃ᩥ⊩ 㔝ཱྀᑀ௦࣭㛗ᆏ㈆㑻࣭ᇼ㔝ᙪ࣭୕㔝 ᚭࠗࡓࡵụ࠾ࡅࡿᗏἾࡽࡢᰤ㣴ሷ㢮ࡢ⁐ฟ࠘ (2000) − 521 −
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