Estimation of Phosphorus Transport Influenced by Climate Change in a Rice Paddy Catchment Using SWAT

Wang, Kunyang; Onodera, Shin Ichi; Saito, Mitsuyo; Okuda, Noboru; Okubo, Takuya

doi:10.1007/s41742-021-00350-0

Cited by 24 publications

(12 citation statements)

References 41 publications

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“…Thus, most of the P applied to the paddy fields in the study area was in the form of chemical fertilizer, with the amount of applied P fertilizer decreasing every year. Since the Yasu River has the largest watershed area in the Lake Biwa basin, nutrient export from the river to the lake is important and has been the subject of several studies (Okubo, 2008; Ishida et al, 2019; Wang et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

“…In terms of bioavailability to microbes, such as bacteria and microalgae, DP has a larger impact on aquatic ecosystems than PP. However, for many watersheds, PP has been reported to account for the greater part of P exports, in terms of quantity (Meyer and Likens, 1979; Inoue and Ebise, 1991; Okubo, 2008; Sharpley et al, 2008; Ide et al, 2012, Wang et al, 2021). According to these studies, PP exported from watersheds, especially during rainfall, has a significant quantitative contribution.…”

Section: Introductionmentioning

confidence: 99%

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Hydrological control of the chemical characteristics of suspended particulate phosphorus in the Yasu River watershed, Japan: Implications for its source and bioavailability

Osaka

Chishiro

Matsumoto

et al. 2022

Hydrological Processes

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Several studies have demonstrated the importance of the bioavailability of particulate phosphorus (PP) exported from various watersheds, especially agricultural land. However, few studies have documented the influence of hydrological conditions on the sources and bioavailability of PP exported from watersheds with multiple land uses.In this study, to assess the sources and bioavailability of PP under different hydrological conditions, we conducted synoptic monitoring of compositional changes in the chemical fractions of PP exported from the Yasu River Watershed, which is covered with a mixture of forest (57.7%) and rice paddy (20.5%) areas. In this river, total phosphorus was composed mainly of PP at all monitoring sites and time points. The sequential extraction of PP revealed that a fraction bound to redox-sensitive iron and manganese, regarded as bioavailable, was specific to the drainage waters of rice paddies, while a fraction bound to organic matter, regarded as less bioavailable, was specific to a forested stream. In the downstream of the Yasu River covering the whole watershed, PP exported under the base flow and small rainfall conditions was composed mainly of the rice paddy-derived fraction, while most of the PP exported under heavy rainfall conditions was the forest-derived fraction. These results suggest that the sources and bioavailability of PP can vary dynamically, depending on the hydrological regimes and land use pattern in the watershed. Even taking into account the fact that the large amount of PP exported during heavy rainfall is considered to be forest-derived PP with low bioavailability, the monitoring results suggested that the annual amount of bioavailable PP exported is larger than that of dissolved phosphorus, and can have a large impact on phosphorus recycling in the downstream lake ecosystem through sedimentation and regeneration.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrological control of the chemical characteristics of suspended particulate phosphorus in the Yasu River watershed, Japan: Implications for its source and bioavailability

Osaka

Chishiro

Matsumoto

et al. 2022

Hydrological Processes

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“…However, P is an endangered and nutrient element compared to Si, and water pollution could be caused by the degradation, recovery and subsequent operation of the spent P-based catalyst. [53][54][55] Thereby, the reaction conditions of the selected catalyst (HTA) 4 SiW in oxidative desulfurization were optimized further in this research, and the purpose of deep desulfurization was achieved successfully. The SiW 4− anion was used as the active component, and more cationic carbon chains could be introduced to enhance the dispersion ability of the catalyst in the oil phase, so as to promote catalytic oxidation desulfurization.…”

Section: Comparison Of Desulfurization Efficiency With Previous Liter...mentioning

confidence: 99%

Synthesis of modified amphiphilic quaternary ammonium silicotungstate and its application in heterogeneous catalytic oxidative desulfurization

Guo

Liu

2022

React. Chem. Eng.

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“…For the calibration run in the third period, daily data were used, and for the validation run in other periods, the monthly data were used. The parameters obtained from the daily calibration can better reflect the relation between precipitation and nutrient loading compared with those obtained from the monthly run [52]. However, for the first and second periods, the amount of data was insufficient for the daily simulation.…”

Section: Data Collection and Model Constructionmentioning

confidence: 99%

Evaluation of nitrogen loading in the last 80 years in an urbanized Asian coastal catchment through the reconstruction of severe contamination period

Wang

Onodera

Saito

2021

Environ. Res. Lett.

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Most semi-enclosed seas have experienced severe eutrophication owing to high nutrient loading from rivers during rapid population growth periods. In Japan, the coastal areas of some megacities (e.g., Tokyo and Osaka) experienced considerable economic growth during the 1960s–1970s. Therefore, determining the amount of nutrient loading during this period is essential to undertake measures for the conservation of coastal environments. However, determining the nutrient loading that occurred several decades ago is generally difficult owing to lacking water quality records. In this study, the nitrogen loading in the Yamato River catchment, an urbanized coastal catchment in Asia, for 80 years from the 1940s to the 2010s is reconstructed using the Soil and Water Assessment Tool. We considered factors such as population growth, wastewater treatment plant (WWTP) construction, and changes in land and fertilizer usage in different urbanization stages. Results show that the total nitrogen loading in the catchment peaked in the 1970s at 6616 tons/year owing to untreated wastewater discharge and rapid increase in population growth. By reducing 57% of the nitrogen loading in the 2010s from the catchment, WWTPs have been instrumental in improving the water environment. The decrease in and integration of agricultural land has reduced nitrogen loading attributed to nonpoint sources; however, this reduction was not obvious because of the high fertilizer usage before the 2000s. Overall, the findings of this study provide a comprehensive understanding of the impact of rapid urbanization in an Asian coastal catchment on nitrogen loading during the high economic growth period in the past. This study will be useful for the long-term assessment of nutrient loading in other.

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Estimation of Phosphorus Transport Influenced by Climate Change in a Rice Paddy Catchment Using SWAT

Cited by 24 publications

References 41 publications

Hydrological control of the chemical characteristics of suspended particulate phosphorus in the Yasu River watershed, Japan: Implications for its source and bioavailability

Hydrological control of the chemical characteristics of suspended particulate phosphorus in the Yasu River watershed, Japan: Implications for its source and bioavailability

Synthesis of modified amphiphilic quaternary ammonium silicotungstate and its application in heterogeneous catalytic oxidative desulfurization

Evaluation of nitrogen loading in the last 80 years in an urbanized Asian coastal catchment through the reconstruction of severe contamination period

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