Effects of winter flooding on phosphorus dynamics in rice fields

Limnology 21 巻 403-413 頁 2020-04-24 発行
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タイトル ( eng )
Effects of winter flooding on phosphorus dynamics in rice fields
作成者
Uehara Yoshitoshi
Ikeya Tohru
Haraguchi Takashi F.
Asano Satoshi
Ogino Yohei
Okuda Noboru
収録物名
Limnology
21
開始ページ 403
終了ページ 413
抄録
Controlling phosphorous (P) loads from rice fields is important for the conservation of aquatic ecosystems, in part because P is relatively concentrated at its sources. Recently, winter flooding, by which irrigation water is maintained in rice fields during winter, has attracted much attention as a farming strategy for environmental conservation and biodiversity maintenance. However, the effects of winter flooding on nutrient cycles have received little research attention. We evaluated the effects of winter flooding on P loads in rice fields by performing laboratory experiments with soils from rice fields with/without winter flooding. These incubation experiments showed that total and soluble reactive P concentrations in surface solutions are decreased by winter flooding. This decrease may follow co-precipitation of P with iron, which may be dissolved from winter flooded soil and rapidly precipitates in solution. Periphyton, which may increase during winter flooding, may not contribute to this decrease because puddling resets periphyton quantities on surface soils. P loads from rice fields with winter flooding over 16 days after fertilization could be reduced by an average of 26% compared with those without winter flooding, indicating that winter flooding is a valuable strategy for reducing P loads in spring when high P loads occur.
著者キーワード
Phosphorus load
Redox condition
Iron dynamics
Incubation experiment
Rice field soil
内容記述
This research was supported by the RIHN Project (Grant No. D06-14200119) and JSPS KAKENHI Grant Number JP19K15723.
言語
英語
資源タイプ 学術雑誌論文
出版者
Springer
発行日 2020-04-24
権利情報
This is a post-peer-review, pre-copyedit version of an article published in Limnology. The final authenticated version is available online at: https://doi.org/10.1007/s10201-020-00621-3
This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
出版タイプ Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 1439-8621
[ISSN] 1439-863X
[DOI] 10.1007/s10201-020-00621-3
[DOI] https://doi.org/10.1007/s10201-020-00621-3