Modeling transport and fate of nitrogen from urea applied to a near-trench paddy field

Liang, Xinqiang; Chen, Y X; Li, Hua; Tian, Guangming; Ni, Wuzhong; He, Minfei; Zhang, Z J

doi:10.1016/j.envpol.2007.02.003

Cited by 78 publications

(52 citation statements)

References 23 publications

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“…Probably, the DON in the drainage water came from the organic fertilizers or the dissolution of the soil organic matter. These results agree with the results of Liang et al (2007) who reported that DON was predominant in ponded water when urea and manure were used. The nitrogen concentration in drainage water was lower than that in irrigation water, because during the storm, the irrigation water was not distributed to the paddy fields and drainage water in two sections was mostly rainfall water.…”

Section: Nitrogen Concentration In Drainage Watersupporting

confidence: 83%

“…In this study, the DTN concentration in drainage water during the paddling period was higher than the 5 mg/L TN value reported by Feng et al (2004), presumably, because of the differences in the fertilizer amount and paddy water management. The DTN concentrations were similar to the results of Liang et al (2007) that reported DTN of 12 -27 mg/L during the fertilizer application period. There are reports that nitrogen concentration is affected by the rainfall when the rainfall occurs after fertilization (Cho et al, 2003;Zhao et al, 2012).…”

Section: Nitrogen Concentration In Drainage Watersupporting

confidence: 80%

“…Among several types of nitrogen forms, some studies reported that NO 3 -is the main form of nitrogen in the drainage water from paddy fields (Feng et al, 2004) or percolation water (Zhu et al, 2000;Tian et al, 2007) and dissolved organic nitrogen (DON) in ponded water (Liang et al, 2007) or percolation water (Zhao et al, 2009). However, the sources of N and its temporal variations were not specifically discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Dissolved total nitrogen (DTN) has been reported as the main form of nitrogen rather than particulate nitrogen (PN), 88% of total nitrogen in drainage water or 50 to 80% of total nitrogen in ponded water (Liang et al, 2007). Among several types of nitrogen forms, some studies reported that NO 3 -is the main form of nitrogen in the drainage water from paddy fields (Feng et al, 2004) or percolation water (Zhu et al, 2000;Tian et al, 2007) and dissolved organic nitrogen (DON) in ponded water (Liang et al, 2007) or percolation water (Zhao et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application of Stable Nitrogen Isotopes to Identify Nitrogen Sources in the Outflow Waters from a Paddy Field

Nguyen

Nakamura

Shindo

et al. 2015

J. of Wat. & Envir. Tech.

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The increasing demand of rice crops leads to elevated levels of nitrogen in water bodies in Asia. The concentrations of organic and inorganic nitrogen and the nitrogen isotope ratio in nitrate (NO 3 -) were analysed to identify the sources of nitrogen in the outflow waters from a paddy field in Japan in 2013. Nitrogen concentrations in the drainage and percolation waters were the highest during the paddling period, NO 3 -was the dominant form of dissolved total nitrogen and the δ 15 N-NO 3 -values in both types of water were close to that of the chemical fertilizer. During the irrigation and non-irrigation periods, NO 3 -and dissolved organic nitrogen (DON) were the dominant in percolation water, whereas DON was dominant in drainage water. The strong correlation between the δ 15 N-NO 3 -values in the irrigation and drainage water suggested that the irrigation water is one of the N sources in the drainage water during the irrigation period. Nitrate in percolation water during irrigation and non-irrigation periods might have been affected by the nitrified ammonium in the chemical fertilizer, or mineralized nitrogen in the soil or organic fertilizer.

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Section: Nitrogen Concentration In Drainage Watersupporting

confidence: 83%

Section: Nitrogen Concentration In Drainage Watersupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of Stable Nitrogen Isotopes to Identify Nitrogen Sources in the Outflow Waters from a Paddy Field

Nguyen

Nakamura

Shindo

et al. 2015

J. of Wat. & Envir. Tech.

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show abstract

“…Where there is a fall in water levels over one time step, the direction of advective flow will be towards Compartment C.2, such that The selected range values for the listed parameters/coefficients are from soft information (i.e., literature tabulation and expert knowledge), e.g., Kadlec and Hammer (1988), Schnoor (1996), Chapra (1997), Di Toro (2001), Jłrgensen and Bendoricchio (2001), Pivato and Raga (2006), Liang et al (2007), Reddy and Delaune (2008), Cerco andCole (1995), andJi (2008). b Uniform distribution.…”

Section: Compartmentalization and Estimation Of Advective Exchange Bmentioning

confidence: 99%

Capturing Spatial Variability of Biogeochemical Mass Exchanges and Reaction Rates in Wetland Water and Soil through Model Compartmentalization

et al. 2017

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A common phenomenon observed in natural and constructed wetlands is short-circuiting of flow and formation of stagnant zones that are only indirectly connected with the incoming water. Biogeochemistry of passive areas is potentially much different than that of active zones. In the research reported in this paper, the spatial resolution of a previously developed wetland nutrient cycling model was improved in order to capture the spatial variability of concentrations and reaction rates regarding nitrogen and carbon cycles throughout active and passive zones of wetlands. The upgraded model allows for several compartments in the horizontal domain, with all neighboring compartments connected through advective and dispersive/diffusive mass transport. The model was applied to data collected from a restored wetland in California that was characterized by the formation of a large stagnant zone at the southern end of the wetland due to close vicinity of the inlet and outlet structures in the northern end. Mass balance analysis revealed that over the course of the research period, about 23.4 AE 3.9% of the incoming total nitrogen load was removed or retained by the wetland. It was observed that mass of all exchanges (physical and biogeochemical) regarding nitrogen cycling decreased along the activity gradient from active to passive zones. Model results also revealed that anaerobic processes become more significant along the activity gradient towards passive areas.

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C hina: Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences

2016

International Encyclopedia of Geography

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Based on reference review, this study investigated ecosystem services supported by 10 typical rice paddies in six rice planting regions of China. The services were primary production, gas regulation, nitrogen transformation, soil organic matter accumulation, and water regulation and flood control. The results indicated that grain production of the 10 rice paddies was between 4.71 and 12.18 t ha -1 y -1 ; straw production was 4.65 to 9.79 t ha -1 y -1 ; gas regulation was calculated to emit O 2 ranging from 8.27 to 19.69 t ha -1 y -1 and to assimilate greenhouse gases ranging from -2.13 to 19.24 t ha -1 y -1 (in CO 2 equivalent); nitrogen transformation was estimated as nitrogen input ranging from 209.70 to 513.93 kg N ha -1 y -1 and nitrogen output of 112.87 to 332.69 kg N ha -1 y -1 ; soil organic matter accumulation was calculated to be between 0.69 and 4.88 t C ha -1 y -1 ; water regulation was estimated to consume water resources of 19875 m 3 ha -1 y -1 and to support water resources of 6430 m 3 ha -1 y -1 ; and flood control of several of the rice paddies was calculated to be 1500 m 3 ha -1 y -1 . The integrated economic value of ecosystem services of these rice paddies was estimated at USD 8605-21 405 ha -1 y -1 , of which 74%-89% of the value can be ascribed to ecosystem services outside primary production. The results also indicated that the integrated economic value of the ecosystem services of the 10 rice paddies was higher when nitrogen fertilizer was applied in the range of 275 to 297 kg N ha -1 . Until now, the economic value of the rice paddy ecosystem has been underestimated as only the economic value of grain and straw production was previously calculated. As more and more forest land and grassland is lost to urban and industrial use, cropland and especially rice paddies, will become more ecologically important to society. The economic value of ecosystem services supplied by rice paddies, outside primary production, are worthy of increased research attention.

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Modeling transport and fate of nitrogen from urea applied to a near-trench paddy field

Cited by 78 publications

References 23 publications

Application of Stable Nitrogen Isotopes to Identify Nitrogen Sources in the Outflow Waters from a Paddy Field

Application of Stable Nitrogen Isotopes to Identify Nitrogen Sources in the Outflow Waters from a Paddy Field

Capturing Spatial Variability of Biogeochemical Mass Exchanges and Reaction Rates in Wetland Water and Soil through Model Compartmentalization

C hina: Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences

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