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Title: 上賀茂試験地における湿性降下物と林内雨のイオン濃度および流入量と窒素負荷量
Other Titles: Concentrations and inputs of inorganic anions and cations, and nitrogen in wet deposition and through fall in the Kamigamo Experimental Forest
Authors: 中西, 麻美  kyouindb  KAKEN_id  orcid (unconfirmed)
平田, 啓一  KAKEN_name
中川, 智之  KAKEN_name
柴田, 泰征  KAKEN_name
大澤, 直哉  kyouindb  KAKEN_id  orcid (unconfirmed)
柴田, 昌三  kyouindb  KAKEN_id
Author's alias: Nakanishi, Asami
Hirata, Keiichi
Nakagawa, Tomoyuki
Shibata, Yasuyuki
Osawa, Naoya
Shibata, Shozo
Keywords: 湿性降下物
wet deposition
nitrogen input
nitrate-nitrogen input
Issue Date: 10-Dec-2002
Publisher: 京都大学大学院農学研究科附属演習林
Journal title: 森林研究
Volume: 74
Start page: 87
End page: 97
Abstract: 上賀茂試験地における湿性降下物のイオン濃度および流入量と, 試験地面積の約6割を占めるヒノキが優占する天然生二次林の林内雨のイオン濃度および流入量を明らかにするために, 1999~2001年に湿性降下物と林内雨の観測を行った.1961~1964年に上賀茂試験地で観測された, 林外雨と林内雨の硝酸態窒素とアンモニア態窒素の濃度および負荷量との比較も行った.1999年からの3年間で湿性降下物の年間加重平均pHは4.7から4.4へ有意に低下した(p < 0.01).湿性降下物, 林内雨ともにイオン濃度および流入量は, 冬季には季節風にもたらされる海塩の影響を, 4月には黄砂エアロゾルによる影響を受けていることが示唆された.1999~2001年の湿性降下物のNO_3^-濃度および負荷量は, 1960年代のバルク試料および林内雨のNO_3^-濃度, 負荷量をともに上回った.1999~2001年の湿性降下物による窒素負荷量は, 1960年代のバルク試料による窒素負荷量に相当し, また林内雨による窒素負荷量は1960年代よりも大きかった.1960年代から窒素負荷量, 特に硝酸態窒素負荷量が増大していることが示された.
To clarify concentrations and inputs of inorganic anions and cations in wet deposition and throughfall at the natural secondary forest dominated by Chamecyparis obtusa, we conducted the experiments from 1999 to 2001. Furthermore, we tried to compare the concentrations and inputs of nitrate and ammonium in bulk deposition and throughfall from 1961 to 1964 at the same site. Annual volume-weighted mean pHs of wet deposition significantly lowered from 4.7 in 1999 to 4.4 in 2001 (p < 0.01). Ionic concentrations and inputs in both wet deposition and throughfall were influenced by seasonal wind during winter season, and yellow sand aerosol that was brought to Japan archipelago from Ocher Plateau in April. Concentrations and inputs of nitrate in wet deposition from 1999 to 2001 were higher than those in both bulk deposition and throughfall from 1961 to 1964. Nitrogen inputs in wet deposition from 1999 to 2001 were approximately equivalent to those of bulk deposition in 1960s. Nitrogen inputs of throughfall in 2001 were larger than those in 1963-1964. It was suggested that nitrogen inputs, especially inputs of nitrate-nitrogen have substantially increased from 1960s.
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