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| Phosphorus losses via surface runoff in rice-wheat cropping systems as impacted by rainfall regimes and fertilizer applications |
| LIU Jian, ZUO Qiang, ZHAI Li-mei, LUO Chun-yan, LIU Hong-bin, WANG Hong-yuan, LIU Shen, ZOU Guo-yuan, REN Tian-zhi |
1、Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture/Institute of Agricultural Resources and Regional
Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2、Department of Plant Science, Pennsylvania State University, University Park, PA16802, USA
3、Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, P.R.China
4、Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, P.R.China |
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摘要 Phosphorus (P) losses from agricultural soils contribute to eutrophication of surface waters. This field plot study investigated effects of rainfall regimes and P applications on P loss by surface runoff from rice (Oryza sativa L.) and wheat (Triticum aestivum L.) cropping systems in Lake Taihu region, China. The study was conducted on two types of paddy soils (Hydromorphic at Anzhen site, Wuxi City, and Degleyed at Xinzhuang site, Changshu City, Jiangsu Province) with different P status, and it covered 3 years with low, high and normal rainfall regimes. Four rates of mineral P fertilizer, i.e., no P (control), 30 kg P ha–1 for rice and 20 kg P ha–1 for wheat (P30+20), 75 plus 40 (P75+40), and 150 plus 80 (P150+80), were applied as treatments. Runoff water from individual plots and runoff events was recorded and analyzed for total P and dissolved reactive P concentrations. Losses of total P and dissolved reactive P significantly increased with rainfall depth and P rates (P<0.0001). Annual total P losses ranged from 0.36–0.92 kg ha–1 in control to 1.13–4.67 kg ha–1 in P150+80 at Anzhen, and correspondingly from 0.36–0.48 kg ha–1 to 1.26–1.88 kg ha–1 at Xinzhuang, with 16–49% of total P as dissolved reactive P. In particular, large amounts of P were lost during heavy rainfall events that occurred shortly after P applications at Anzhen. On average of all P treatments, rice growing season constituted 37–86% of annual total P loss at Anzhen and 28–44% of that at Xinzhuang. In both crop seasons, P concentrations peaked in the first runoff events and decreased with time. During rice growing season, runoff P concentrations positively correlated (P<0.0001) with P concentrations in field ponding water that was intentionally enclosed by construction of field bund. The relative high P loss during wheat growing season at Xinzhuang was due to high soil P status. In conclusion, P should be applied at rates balancing crop removal (20–30 kg P ha–1 in this study) and at time excluding heavy rains. Moreover, irrigation and drainage water should be appropriately managed to reduce runoff P losses from rice-wheat cropping systems.
Abstract Phosphorus (P) losses from agricultural soils contribute to eutrophication of surface waters. This field plot study investigated effects of rainfall regimes and P applications on P loss by surface runoff from rice (Oryza sativa L.) and wheat (Triticum aestivum L.) cropping systems in Lake Taihu region, China. The study was conducted on two types of paddy soils (Hydromorphic at Anzhen site, Wuxi City, and Degleyed at Xinzhuang site, Changshu City, Jiangsu Province) with different P status, and it covered 3 years with low, high and normal rainfall regimes. Four rates of mineral P fertilizer, i.e., no P (control), 30 kg P ha–1 for rice and 20 kg P ha–1 for wheat (P30+20), 75 plus 40 (P75+40), and 150 plus 80 (P150+80), were applied as treatments. Runoff water from individual plots and runoff events was recorded and analyzed for total P and dissolved reactive P concentrations. Losses of total P and dissolved reactive P significantly increased with rainfall depth and P rates (P<0.0001). Annual total P losses ranged from 0.36–0.92 kg ha–1 in control to 1.13–4.67 kg ha–1 in P150+80 at Anzhen, and correspondingly from 0.36–0.48 kg ha–1 to 1.26–1.88 kg ha–1 at Xinzhuang, with 16–49% of total P as dissolved reactive P. In particular, large amounts of P were lost during heavy rainfall events that occurred shortly after P applications at Anzhen. On average of all P treatments, rice growing season constituted 37–86% of annual total P loss at Anzhen and 28–44% of that at Xinzhuang. In both crop seasons, P concentrations peaked in the first runoff events and decreased with time. During rice growing season, runoff P concentrations positively correlated (P<0.0001) with P concentrations in field ponding water that was intentionally enclosed by construction of field bund. The relative high P loss during wheat growing season at Xinzhuang was due to high soil P status. In conclusion, P should be applied at rates balancing crop removal (20–30 kg P ha–1 in this study) and at time excluding heavy rains. Moreover, irrigation and drainage water should be appropriately managed to reduce runoff P losses from rice-wheat cropping systems.
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Received: 23 January 2015
Accepted:
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| Fund: This study was funded by the Special Fund for Agro- Scientific Research in the Public Interest, China (201003014). |
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Corresponding Authors:
LIU Hong-bin,Tel: +86-10-82108763, E-mail: liuhongbin@caas.cn
E-mail: liuhongbin@caas.cn
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| About author: LIU Jian, E-mail: jianliu1985yy@163.com; ZUO Qiang,* These authors contributed equally to this study. |
Cite this article:
LIU Jian, ZUO Qiang, ZHAI Li-mei, LUO Chun-yan, LIU Hong-bin, WANG Hong-yuan, LIU Shen, ZOU Guo-yuan, REN Tian-zhi.
2016.
Phosphorus losses via surface runoff in rice-wheat cropping systems as impacted by rainfall regimes and fertilizer applications. Journal of Integrative Agriculture, 15(3): 667-677.
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