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일본 노지채소 집약 재배지역 토양 침출수 중의 NO<sub>3</sub>-N 농도와 질소 안정동위원소 자연존재비(δ<sup>15</sup>N)
박광래,최재성,백형진,김원일,정구복,윤순강,조진규,Park, Kwang-Lai,Choi, Jae-Seong,Baek, Hyung-Jin,Kim, Won-Il,Jung, Goo-Bok,Yun, Sun-Gang,Cho, Jin-Kyu 한국토양비료학회 2003 한국토양비료학회지 Vol.36 No.3
질소 안정동위체 자연존재비(${\delta}^{15}N$)측정을 통해 노지 채소 재배토양에서 침출되어 지하로 이동하는 $NO_3-N$의 동태를 조사한 결과는 다음과 같다. 1) 3 m 관정수와 6 m 관정수의 $NO_3-N$ 농도 평균값은 각각 25.7 및 $2.8mg\;L^{-1}$이었으며, ${\delta}^{15}N$는 +3.6 및 +4.7‰이었다. 2) 암거배수의 $NO_3-N$ 농도와 ${\delta}^{15}N$의 평균은 각각 $35.5mg\;L^{-1}$와 +6.6‰로 토양 침투수는 즐인 선상지 전체로부터 모아지며 비교적 민감하게 화학비료, 가축분 퇴비 유래 질소농도의 변화를 반영하였다. 3) 단지 말단부의 용출수의 $NO_3-N$ 농도와 ${\delta}^{15}N$의 평균은 각각 $19.4mg\;L^{-1}$ 및 +7.9‰로서 채소 재배지대의 복류수 중에는 축산폐기물 유래가 침투되어 있는 것을 나타냈다. 4) 본 지구의 채소재배 토양의 ${\delta}^{15}N$은 2 N KCl 추출 가용태 질소로서 +6.1‰, 질산태 질소로서 +5.1‰이며, 주로 사용되는 화학비료의 전질소의 ${\delta}^{15}N$은 질산 억제비료가 -6.1‰, 그리고 완효성비료가 2.2‰이었다. Nitrate-N concentrations and the corresponding ${\delta}^{15}N$ values were determined with water samples collected periodically from artesian wells (3 and 6 m deep), underdrainage and gushout waters in a Welsh onion cultivated area in the Kushibiki Fan, Saitama Prefecture, Japan. Average $NO_3-N$ concentrations in waters from 3 and 6 m wells were 25.7 and $2.8mg\;L^{-1}$, whereas ${\delta}^{15}N$ values were 3.6 and 4.7‰, respectively. The $NO_3-N$ concentration and ${\delta}^{15}N$ value of the underdrainge water were $35.5mg\;L^{-1}$ and 6.6‰, reflecting rapid input of chemical fertilizers and farmyard manure. The mean values of $NO_3-N$ concentration and ${\delta}^{15}N$ in the gushout water flown out of the edge of Kushibiki Fan were $19.4mg\;L^{-1}$ and 7.9‰, respectively. As a results the ${\delta}^{15}N$ values of the gushout water were higher than those of the artesian wells and underdrinage water. The ${\delta}^{15}N$ values of total-N and $NO_3-N$ of the soils were 6.1 and 5.10‰, respectively, while those for nitrification-inhibitor containing fertilizer and slow-release fertilizers were -6.1 and -2.2‰, respectively.
일본 궁고도의 (宮古島) 지하수중의 NO3-N 와 δ15N 치
박광래,태택희구웅 (態澤喜久雄) ( Kwang Lai Park,Kikuo Kumazawa ) 한국환경농학회 1995 한국환경농학회지 Vol.14 No.1
Nitrate concentration and δ^(15)N value in the groundwater in Miyakojima Island, Okinawa, were measured during 1992-1993. Water from the shallow and the deep wells at the ten separate sites were sampled. Mineral contents and natural nitrogen isotope abundance(δ^(15)N) were analyzed using a liquid chromatography and a mass spectrometry (Finnigan MAT 252). Except for waters which were directly influenced by sea water invasion, most of the groundwater showed small variations among their mineral contents and δ^(15)N values. The average nitrate nitrogen concentrations were 1.4∼11.5㎎L^(-1) and average δ^(15)N values were +4.3∼+9.7‰. From the nitrate concentration and δ^(15)N value observed, the types of the groundwater could be categorized into four groups, such as high δ^(15)N and high nitrate, high δ^(15)N and medium nitrate, low δ^(15)N and medium nitrate, and low δ^(15)N and low nitrate, reflecting the main source of nitrate contamination, such as animal and domestic waste, animal waste and soil organic matter, soil organic matter and chemical fertilizer, and chemical fertilizer, respectively. It was discussed that the lowest δ^(15)N value was higher than the δ^(15)N value of the chemical fertilizers used in this island(-3.9∼-1.4%), then considerable amounts of nitrogen must be lost by ammonium evaporation or denitrification after fertilization.