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Importance of subsurface fluxes of water, nitrogen and phosphorus from rice paddy fields relative to surface runoff

Author

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  • Fu, Jin
  • Wu, Yali
  • Wang, Qihui
  • Hu, Kelin
  • Wang, Shiqin
  • Zhou, Minghua
  • Hayashi, Kentaro
  • Wang, Hongyuan
  • Zhan, Xiaoying
  • Jian, Yiwei
  • Cai, Chen
  • Song, Meifang
  • Liu, Kaiwen
  • Wang, Yonghua
  • Zhou, Feng
  • Zhu, Jianqiang

Abstract

Rice paddy fields pose a high risk of water pollutions for the surrounding waterbodies through surface runoff and subsurface fluxes. Compared to surface runoff, subsurface flux from rice paddy fields has received less attention and is still poorly quantified, mainly due to low-frequency measurements at field scale and limited modeling capability at regional scale. Here we proposed a simplified modeling approach to estimate the subsurface fluxes of water, nitrogen (N) and phosphorus (P) from rice paddy fields and examined their relative importance compared to surface runoff. This model was established based on the high-frequency field measurements over two rice growing seasons in central China and the extended datasets across the East Asia. Two-year site-based observations indicate the significance of subsurface fluxes of water (737–785 mm season−1), N (28.5–40.0 kg N ha−1) and P (0.7–4.3 kg P ha−1) compared to those of surface runoff (178–199 mm season−1, 4.5–12.9 kg N ha−1, 0.5–2.6 kg P ha−1). Our regional estimations in the East Asia reveal that subsurface fluxes from rice paddy fields were comparable with surface fluxes, primarily controlled by the magnitude of seasonal precipitation. Subsurface fluxes were the dominant pathway of nutrient losses in drier rice cropping areas, while surface runoff was the more important process in wetter areas. In the light of the regional differences, we suggest that a spatially flexible set of policies for mitigating nutrient losses from rice paddy fields would be beneficial for the future water-quality improvements in the surrounding waterbodies.

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  • Fu, Jin & Wu, Yali & Wang, Qihui & Hu, Kelin & Wang, Shiqin & Zhou, Minghua & Hayashi, Kentaro & Wang, Hongyuan & Zhan, Xiaoying & Jian, Yiwei & Cai, Chen & Song, Meifang & Liu, Kaiwen & Wang, Yonghua, 2019. "Importance of subsurface fluxes of water, nitrogen and phosphorus from rice paddy fields relative to surface runoff," Agricultural Water Management, Elsevier, vol. 213(C), pages 627-635.
  • Handle: RePEc:eee:agiwat:v:213:y:2019:i:c:p:627-635
    DOI: 10.1016/j.agwat.2018.11.005
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    References listed on IDEAS

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    1. Li, Yong & Šimůnek, Jirka & Zhang, Zhentin & Jing, Longfei & Ni, Lixiao, 2015. "Evaluation of nitrogen balance in a direct-seeded-rice field experiment using Hydrus-1D," Agricultural Water Management, Elsevier, vol. 148(C), pages 213-222.
    2. Yoshinaga, Ikuo & Miura, Asa & Hitomi, Tadayoshi & Hamada, Koji & Shiratani, Eisaku, 2007. "Runoff nitrogen from a large sized paddy field during a crop period," Agricultural Water Management, Elsevier, vol. 87(2), pages 217-222, January.
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    2. Wang, Yanzhi & Chen, Ji & Sun, Yidi & Jiao, Yanting & Yang, Yi & Yuan, Xiaoqi & Lærke, Poul Erik & Wu, Qi & Chi, Daocai, 2023. "Zeolite reduces N leaching and runoff loss while increasing rice yields under alternate wetting and drying irrigation regime," Agricultural Water Management, Elsevier, vol. 277(C).
    3. Roudbari, Maziyar Vaez & Dehnavi, Ali & Jamshidi, Shervin & Yazdani, Mohamadreza, 2023. "A multi-pollutant pilot study to evaluate the grey water footprint of irrigated paddy rice," Agricultural Water Management, Elsevier, vol. 282(C).
    4. Shi, Xinrui & Hu, Kelin & Batchelor, William D. & Liang, Hao & Wu, Yali & Wang, Qihui & Fu, Jin & Cui, Xiaoqing & Zhou, Feng, 2020. "Exploring optimal nitrogen management strategies to mitigate nitrogen losses from paddy soil in the middle reaches of the Yangtze River," Agricultural Water Management, Elsevier, vol. 228(C).
    5. Kwon, Hong-Il & Koh, Dong-Chan & Cho, Byong-Wook & Jung, Youn-Young, 2022. "Nutrient dynamics in stream water and groundwater in riparian zones of a mesoscale agricultural catchment with intense seasonal pumping," Agricultural Water Management, Elsevier, vol. 261(C).
    6. Liu, Lianhua & Ouyang, Wei & Wang, Yidi & Lian, Zhongmin & Pan, Junting & Liu, Hongbin & Chen, Jingrui & Niu, Shiwei, 2023. "Paddy water managements for diffuse nitrogen and phosphorus pollution control in China: A comprehensive review and emerging prospects," Agricultural Water Management, Elsevier, vol. 277(C).

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