Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (1): 167-176.DOI: 10.1016/S2095-3119(13)60402-5

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A 15N-Labeling Study of the Capture of Deep Soil Nitrate from Different Plant Systems

 YANG  Zhi-xin, WANG  Jue, DI  Hong-jie, ZHANG  Li-juan , JU  Xiao-tang   

  1. 1.Key Laboratory for Farmland Eco-Environment, Hebei Province/College of Resource and Environmental Sciences, Agricultural University of
    Hebei, Baoding 0710001, P.R.China
    2.Centre for Soil and Environmental Research, PO Box 85084, Lincoln University, Lincoln 7647, New Zealand
    3.College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China
  • 收稿日期:2012-11-05 出版日期:2014-01-01 发布日期:2014-01-04
  • 通讯作者: ZHANG Li-juan, Tel: +86-312-7528210, E-mail: lj_zh2001@163.com
  • 作者简介:YANG Zhi-xin, Mobile: 18632209728, E-mail: yangzhixin@126.com
  • 基金资助:

    This work was financially supported by the Provincial Natural Science Foundation of Hebei Province in China (C2006000491). We also acknowledge the financial support from the National Natural Science Foundation of China (30571110, 31172033) and the National 863 Program of China (2012AA101403-3) for this research.

A 15N-Labeling Study of the Capture of Deep Soil Nitrate from Different Plant Systems

 YANG  Zhi-xin, WANG  Jue, DI  Hong-jie, ZHANG  Li-juan , JU  Xiao-tang   

  1. 1.Key Laboratory for Farmland Eco-Environment, Hebei Province/College of Resource and Environmental Sciences, Agricultural University of
    Hebei, Baoding 0710001, P.R.China
    2.Centre for Soil and Environmental Research, PO Box 85084, Lincoln University, Lincoln 7647, New Zealand
    3.College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China
  • Received:2012-11-05 Online:2014-01-01 Published:2014-01-04
  • Contact: ZHANG Li-juan, Tel: +86-312-7528210, E-mail: lj_zh2001@163.com
  • About author:YANG Zhi-xin, Mobile: 18632209728, E-mail: yangzhixin@126.com
  • Supported by:

    This work was financially supported by the Provincial Natural Science Foundation of Hebei Province in China (C2006000491). We also acknowledge the financial support from the National Natural Science Foundation of China (30571110, 31172033) and the National 863 Program of China (2012AA101403-3) for this research.

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摘要： The objective of this study was to determine the efficiency of different plant systems in capturing deep soil nitrate (NO3 -) to reduce NO3 - leaching in a field plot experiment using 15N labelling. The study was conducted on a calcareous alluvial soil on the North China Plains and the plant systems evaluated included alfalfa (Medicago sativa), American black poplar (Populus nigra) and cocksfoot (Dactylis). 15N-labelled N fertilizer was injected to 90 cm depth to determine the recovery of 15N by the plants. With conventional water and nutrient management, the total recovery of 15N-labeled NO3 --N was 23.4% by alfalfa after two consecutive growth years. The recovery was significantly higher than those by American black poplar (12.3%) and cocksfoot (11.4%). The highest proportion of soil residual 15N from the labeled fertilizer N (%Ndff) was detected around 90 cm soil depth at the time of the 1st year harvest and at 110-130 cm soil depth at time of the 2nd year harvest. Soil %Ndff in 0-80 cm depth was significantly higher in the alfalfa treatment than those in all the other treatments. The soil %Ndff below 100 cm depth was much lower in the alfalfa than those in all the other treatments. These results indicated that 15N leaching losses in the alfalfa treatment were significantly lower than by those in the black poplar and cocksfoot treatments, due to the higher root density located in nitrate labeling zone of soil profile. In conclusion, alfalfa may be used as a plant to capture deep soil NO3 - left from previous crops to reduce NO3 - leaching in high intensity crop cultivation systems of North China Plain.

关键词: 15N-labeled nitrate , tree and forage grass , alfalfa , cocksfoot , black poplar , residual nitrate in subsoil , capture ability

Abstract: The objective of this study was to determine the efficiency of different plant systems in capturing deep soil nitrate (NO3 -) to reduce NO3 - leaching in a field plot experiment using 15N labelling. The study was conducted on a calcareous alluvial soil on the North China Plains and the plant systems evaluated included alfalfa (Medicago sativa), American black poplar (Populus nigra) and cocksfoot (Dactylis). 15N-labelled N fertilizer was injected to 90 cm depth to determine the recovery of 15N by the plants. With conventional water and nutrient management, the total recovery of 15N-labeled NO3 --N was 23.4% by alfalfa after two consecutive growth years. The recovery was significantly higher than those by American black poplar (12.3%) and cocksfoot (11.4%). The highest proportion of soil residual 15N from the labeled fertilizer N (%Ndff) was detected around 90 cm soil depth at the time of the 1st year harvest and at 110-130 cm soil depth at time of the 2nd year harvest. Soil %Ndff in 0-80 cm depth was significantly higher in the alfalfa treatment than those in all the other treatments. The soil %Ndff below 100 cm depth was much lower in the alfalfa than those in all the other treatments. These results indicated that 15N leaching losses in the alfalfa treatment were significantly lower than by those in the black poplar and cocksfoot treatments, due to the higher root density located in nitrate labeling zone of soil profile. In conclusion, alfalfa may be used as a plant to capture deep soil NO3 - left from previous crops to reduce NO3 - leaching in high intensity crop cultivation systems of North China Plain.

Key words: 15N-labeled nitrate , tree and forage grass , alfalfa , cocksfoot , black poplar , residual nitrate in subsoil , capture ability