Journal of Integrative Agriculture ›› 2018, Vol. 17 ›› Issue (12): 2790-2801.DOI: 10.1016/S2095-3119(18)61945-8

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  • 收稿日期:2017-11-17 出版日期:2018-12-01 发布日期:2018-12-03

Suitability of the DNDC model to simulate yield production and nitrogen uptake for maize and soybean intercropping in the North China Plain

ZHANG Yi-tao1, 2, 3*, LIU Jian4*, WANG Hong-yuan1, LEI Qiu-liang1, LIU Hong-bin1, ZHAI Li-mei1, REN Tian-zhi5, ZHANG Ji-zong1   

  1. 1 Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture, Beijing 100081, P.R.China
    2 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
    3 Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, New Hampshire 03824, USA
    4 School of Environment and Sustainability, Global Institute for Water Security, University of Saskatchewan, SK S7N 0X4, Canada
    5 Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, P.R.China
  • Received:2017-11-17 Online:2018-12-01 Published:2018-12-03
  • Contact: Correspondence ZHANG Ji-zong,E-mail: zhangjizong@caas.cn
  • About author:ZHANG Yi-tao, E-mail: ytzhang1986@163.com; LIU Jian, E-mail:jianliu1985yy@163.com; * These authors contributed equally to this study.
  • Supported by:
    This research was supported by the National Natural Science Foundation of China (31701995 and 31572208), the National Key Research & Development Program of China (2016YFD0800101), the Newton Fund of UK-China (BB/N013484/1). This paper was also supported by China Scholarship Council (2015-7169).

Abstract:

Intercropping is an important agronomic practice.  However, assessment of intercropping systems using field experiments is often limited by time and cost.  In this study, the suitability of using the DeNitrification DeComposition (DNDC) model to simulate intercropping of maize (Zea mays L.) and soybean (Glycine max L.) and its aftereffect on the succeeding wheat (Triticum aestivum L.) crop was tested in the North China Plain.  First, the model was calibrated and corroborated to simulate crop yield and nitrogen (N) uptake based on a field experiment with a typical double cropping system.  With a wheat crop in winter, the experiment included five treatments in summer: maize monoculture, soybean monoculture, intercropping of maize and soybean with no N topdressing to maize (N0), intercropping of maize and soybean with 75 kg N ha–1 topdressing to maize (N75), and intercropping of maize and soybean with 180 kg N ha–1 topdressing to maize (N180).  All treatments had 45 kg N ha–1 as basal fertilizer.  After calibration and corroboration, DNDC was used to simulate long-term (1955 to 2012) treatment effects on yield.  Results showed that DNDC could stringently capture the yield and N uptake of the intercropping system under all N management scenarios, though it tended to underestimate wheat yield and N uptake under N0 and N75.  Long-term simulation results showed that N75 led to the highest maize and soybean yields per unit planting area among all treatments, increasing maize yield by 59% and soybean yield by 24%, resulting in a land utilization rate 42% higher than monoculture.  The results suggest a high potential to promote soybean production by intercropping soybean with maize in the North China Plain, which will help to meet the large national demand for soybean.

Key words: maize intercropping with soybean ,  DNDC ,  topdressing N ,  yield ,  N uptake