Nitrogen isotope ratios of dissolved organic nitrogen in wet precipitation in a metropolis surrounded by agricultural areas in southern Korea

Lee, Kwang-Seung; Lee, Dong-Suk; Lim, Sang-Sun; Kwak, Jin‐Hyeob; Jeon, Byung-Jun; Lee, Se-In; Lee, Sang-Mo; Choi, Woo‐Jung

doi:10.1016/j.agee.2012.07.010

Cited by 41 publications

(14 citation statements)

References 45 publications

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“…In contrast to observations from regions characterized by intensive agricultural practices (e.g., China and midwestern USA) (Fahey et al, 1999;Zhang et al, 2008), NO − 3 showed higher abundances with respect to NH + 4 , implying that combustion processes contributed more significantly than agricultural activities to reactive inorganic nitrogen in our samples (Galloway et al, 2004;Spokes and Jickells, 2005;Lee et al, 2012). A few exceptions were observed in April, May, October, and November (Fig.…”

Section: Concentrations and Speciationcontrasting

confidence: 49%

“…According to statistical data from International Fertilizer Industry Association (2013), a considerable fraction of the nitrogen fertilizer consumed in Korea each year is in the form of urea. In addition, Lee et al (2012) found NH + 4 and DON in precipitation collected in a southern Korean city were mainly derived from fertilizer use and livestock excretion in surrounding rural areas using nitrogen isotopic analysis. This suggests that agricultural practices conducted within Korea could be a crucial source of NH 3 and organic nitrogen in the atmosphere, which is in line with the conclusions drawn from the AMBT analysis that the Korean Peninsula contributes significantly to NH + 4 and DON in our samples (Fig.…”

Section: Source Identification For Donmentioning

confidence: 99%

“…2), when concentrations of NH + 4 were similar to or higher than those of NO − 3 . These exceptions can be attributed to enhanced agricultural activities (i.e., application of N fertilizer and livestock manure to the farmland) during these time periods in Korea (Lee at al., 2012). Although being a minor component, DON made up a considerable fraction (28 % on average) of the TDN in our samples, approximating to that contributed by NH + 4 (30 % on average).…”

Section: Concentrations and Speciationmentioning

confidence: 99%

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Sources and fluxes of organic nitrogen in precipitation over the southern East Sea/Sea of Japan

Yan

Kim

2015

Atmos. Chem. Phys.

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Abstract. We measured total dissolved reactive nitrogen in precipitation samples collected at Uljin, a Korean coastal site upwind of the southern East Sea/Sea of Japan (EJS), selected as a representative study site of atmospheric deposition over the northwestern Pacific margin. NO − 3 was found to be the most abundant nitrogen species, followed by NH + 4 and dissolved organic nitrogen (DON). Air-mass back-trajectory (AMBT) analysis revealed that a significant fraction of the inorganic nitrogen (NO − 3 and NH + 4 ) originated from mainland Asia, whereas the DON was primarily derived from Korea. Using varimax-rotated factor analysis in combination with major ions as tracers, agricultural activities in Korea were identified as the primary sources of DON in these samples. In addition, a positive correlation was found at Uljin between the size of organic fraction in total reactive nitrogen and nitrogen to carbon atomic ratio in organic matter. This correlation has also been observed at other locations worldwide, implying the utilization potential of atmospheric organic nitrogen might increase with its proportion in total nitrogen. Combining wet deposition measurements in this study with literature values for dry deposition observed at a remote island in the EJS, the total atmospheric depositional flux of reactive nitrogen was estimated to be 115 mmol N m −2 yr −1 over the southern EJS. Our study sheds new light on the potentially significant contribution to primary productivity of the northwestern Pacific Ocean by atmospheric deposition of nitrogen, especially the organic fraction.

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Section: Concentrations and Speciationcontrasting

confidence: 49%

Section: Source Identification For Donmentioning

confidence: 99%

Section: Concentrations and Speciationmentioning

confidence: 99%

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Sources and fluxes of organic nitrogen in precipitation over the southern East Sea/Sea of Japan

Yan

Kim

2015

Atmos. Chem. Phys.

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“…5a) could be ascribed to the dilution with rainfall water. In the study area, the T-N concentration of rainfall during the rice growing season ranged from 0.36 to 1.52 mg N L −1 (Lee et al 2012). The pattern of T-P concentration of runoff differed from that of T-N as indicated by the lack of a relationship between T-P concentration and agricultural management practices (Tables 1 and 2 and Supplementary Fig.…”

Section: Nutrient Loss and Its Relationship To Rainfall And Agricultumentioning

confidence: 99%

Further Understanding of the Impacts of Rainfall and Agricultural Management Practices on Nutrient Loss from Rice Paddies in a Monsoon Area

Jung

Lim

Kwak

et al. 2015

Water Air Soil Pollut

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As rice paddies are widespread sources of water pollution in the agricultural regions of the Asian monsoon area, a mechanistic understanding of nutrient loss from paddies is critical for water quality management. A 2-year experiment was conducted in a typical monsoon-affected rice field to improve our understanding of the impacts of rainfall and agricultural management practice on nitrogen (N) and phosphorus (P) loss. Samples of paddy drainage water were collected during rainfall events (n=25) and analyzed for total N (T-N) and total P (T-P) concentrations. The impacts of rainfall (amount, duration, and intensity) and agricultural management practice (transplanting and fertilization) on the event mean concentration (EMC) and loss of nutrient were assessed using regression analyses. The results showed that T-N and T-P concentrations were affected by agricultural practice; meanwhile, loss of T-N and T-P was correlated with rainfall characteristics. Specifically, the EMC of T-N but T-P was negatively (p<0.001) correlated with the number of days after agricultural practice in both years, which likely represents a decrease in nutrient availability in paddy water over time. Loss of T-N and T-P was positively (p<0.01) correlated with rainfall amount, and this suggests that the rainfall-runoff process is a key driver of nutrient loss in the study area. Our results suggest that rainfall amount and days after transplanting need to be taken into account when estimating nutrient loss from rice paddies in monsoon regions.

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“…Isotope approaches as complementary tools to chemical composition of precipitation have already proven their added value to identify the origin of pollutants (e.g. Caron and Tessier 1986;Lee et al 2012;Xiao et al 2012;Lim et al 2014). Similar approaches have already been used for characterising precipitation in Wroclaw (SW Poland) (Górka et al 2008;Szynkiewicz et al 2008;Górka et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Chemical and isotopic interpretation of major ion compositions from precipitation: a one-year temporal monitoring study in Wrocław, SW Poland

et al. 2015

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Nitrogen isotope ratios of dissolved organic nitrogen in wet precipitation in a metropolis surrounded by agricultural areas in southern Korea

Cited by 41 publications

References 45 publications

Sources and fluxes of organic nitrogen in precipitation over the southern East Sea/Sea of Japan

Sources and fluxes of organic nitrogen in precipitation over the southern East Sea/Sea of Japan

Further Understanding of the Impacts of Rainfall and Agricultural Management Practices on Nutrient Loss from Rice Paddies in a Monsoon Area

Chemical and isotopic interpretation of major ion compositions from precipitation: a one-year temporal monitoring study in Wrocław, SW Poland

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