• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>土壤圈（英文版） >Groundwater Contamination with NO3-N in a Wheat-Corn Cropping System in the North China Plain
【24h】

Groundwater Contamination with NO3-N in a Wheat-Corn Cropping System in the North China Plain

机译：华北平原小麦玉米种植系统中NO3-N对地下水的污染

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

The North China Plain, where summer corn (Zea mays L.) and winter wheat (Triticum 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 NO3-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 higherthan-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.
机译：华北平原是中国的主要农业区，夏玉米（Zea mays L.）和冬小麦（Triticum aestivum L.）是主要的农作物。渗透性土壤使该地区易受NO3-N污染，该污染被大量施用到400 kg以上的NO3-N ha-1肥料中。 2002年建立了田间试验，以调查氮肥施用量，土壤NO3-N和NO3-N地下水污染之间的关系。两个相邻的田地分别以当地农民的氮肥施用量（LN）和正常施用量（HN）的两倍施肥，并在其他相同条件下进行管理。这些田地是在传统的夏季玉米/冬小麦轮作下进行的。在22个月的时间内，我们监测了散装土壤和土壤孔隙水中NO3-N的浓度，以20-40 cm的增量递增至180 cm的深度。我们还监测了地下水中NO3-N的浓度和地下水位的深度。 LN和HN处理之间未观察到土壤NO3-N的显着差异。我们确定了NO3-N羽流在土壤剖面中向下移动。与LN处理相比，HN处理导致地下水中的NO3-N明显更高，其中地下水NO3-N始终超过10 mg L-1的最大安全水平，但在2000年，地下水NO3-N也高于最大安全水平。大雨后进行LN处理。 2003年6月，7月和2003年8月的大雨使土壤中的NO3-N淋溶增加，地下水中的NO3-N浓度升高。地下水位同时上升到富含NO3-N的土壤层中，也导致地下水中NO3-N浓度增加。我们的结果表明，在平均降雨的条件下，土壤剖面中会累积土壤NO3-N。随后的明显高于平均水平的降雨连续将土壤中的NO3-N冲刷到更深的层中，并使地下水位升高，从而导致地下水不断被NO3-N污染。结果表明，在华北平原的常规耕作方式下，NO3-N可能会污染地下水，尤其是在暴雨期间，且地下水污染程度似乎与N的施用量成正比。降低施肥率，分配肥料和优化灌溉计划有可能减少地下水中的NO3-N污染。

著录项

  • 来源
    《土壤圈（英文版）》 |2007年第6期|721-731|共11页
  • 作者

  • 作者单位

    State Experimental Station for Agro-Ecology, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

    State Experimental Station for Agro-Ecology, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

    Department of Crop and Soil Sciences, Center for Multiphase Environmental Research, Washington State University,Pullman, WA 99164 USA;

    State Experimental Station for Agro-Ecology, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

    State Experimental Station for Agro-Ecology, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

    State Experimental Station for Agro-Ecology, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 农业基础科学;
  • 关键词

    field experiment, groundwater contamination, NO3-N, wheat-corn cropping system;

    机译：田间试验;地下水污染;NO3-N;麦玉米种植系统;
  • 入库时间 2022-08-19 04:04:16
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号