Groundwater contamination with NO3-N in a wheat-corn cropping system in the north China plain
文献类型：期刊论文
| 作者 | Zhao Bing-Zi; Zhang Jia-Bao; Flury, M.; Zhu An-Ning; Jiang Qi-Ao; Bi Jin-Wei |
| 刊名 | PEDOSPHERE
 |
| 出版日期 | 2007-12-01 |
| 卷号 | 17期号:6页码:721-731 |
| 关键词 | field experiment groundwater contamination NO3-N wheat-corn cropping system |
| ISSN号 | 1002-0160 |
| 通讯作者 | Zhang Jia-Bao(jbzhang@issas.ac.cn) |
| 英文摘要 | The North China Plain, where summer corn (Zea mays L.) and winter wheat (Triticurn aestivum L.) are the major crops grown, is a major agricultural area in China. Permeable soils make the region susceptible to groundwater pollution by NO3-N, which is applied to fields in large amounts of more than 400 kg NO3-N ha(-1) as fertilizer. A field experiment was established in 2002 to examine the relationship among N fertilization rate, soil NO3-N, and NO3-N groundwater contamination. Two adjacent fields were fertilized with local farmers' N fertilization rate (LN) and double the normal application rate (HN), respectively, and managed under otherwise identical conditions. The fields were under a traditional summer corn/winter wheat rotation. Over a 22-month period, we monitored NO:3-N concentrations in both bulk soil and soil pore water in 20-40 cm increments up to 180 cm depth. We also monitored NO3-N concentrations in groundwater and the depth of the groundwater table. No significant differences in soil NO3-N were observed between the LN and HN treatment. We identified NO3-N plumes moving downward through the soil profile. The HN treatment resulted in significantly higher groundwater NO3-N, relative to the LN treatment, with groundwater NO3-N consistently exceeding the maximum safe level of 10 mg L-1, but groundwater NO3-N above the maximum safe level was also observed in the LN treatment after heavy rain. Heavy rain in June, July, and August 2003 caused increased NO3-N leaching through the soil and elevated NO3-N concentrations in the groundwater. Concurrent rise of the groundwater table into NO3-N-rich soil layers also contributed to the increased NO3-N concentrations in the groundwater. Our results indicate that under conditions of average rainfall, soil NO3-N was accumulated in the soil profile. The subsequent significantly higher-than-average rainfalls continuously flushed the soil NO3-N into deeper layers and raised the groundwater table, which caused continuous groundwater contamination with NO3-N. The results suggest that under common farming practices in the North China Plain, groundwater contamination with NO3-N was likely, especially during heavy rainfalls, and the degree of groundwater contamination appeared to be proportional to the N application rates. Decreasing fertilization rates, splitting fertilizer inputs, and optimizing irrigation scheduling had potential to reduce groundwater NO3-N contamination. |
| 收录类别 | SCI |
| WOS关键词 | NITRATE-NITROGEN ; SUBSURFACE DRAINAGE ; WATER-QUALITY ; DYNAMICS ; SOIL ; FERTILIZER ; IMPACTS ; WINTER |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000251388200006 |
| 出版者 | SCIENCE CHINA PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558640 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Zhang Jia-Bao |
| 作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, State Expt Stn Agro Ecol, Nanjing 210008, Peoples R China 2.Washington State Univ, Ctr Multiphase Environm Res, Dept Crop & Soil Sci, Pullman, WA 99164 USA |
| 推荐引用方式 GB/T 7714 | Zhao Bing-Zi,Zhang Jia-Bao,Flury, M.,et al. Groundwater contamination with NO3-N in a wheat-corn cropping system in the north China plain[J]. PEDOSPHERE,2007,17(6):721-731. |
| APA | Zhao Bing-Zi,Zhang Jia-Bao,Flury, M.,Zhu An-Ning,Jiang Qi-Ao,&Bi Jin-Wei.(2007).Groundwater contamination with NO3-N in a wheat-corn cropping system in the north China plain.PEDOSPHERE,17(6),721-731. |
| MLA | Zhao Bing-Zi,et al."Groundwater contamination with NO3-N in a wheat-corn cropping system in the north China plain".PEDOSPHERE 17.6(2007):721-731. |
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来源：南京土壤研究所
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