Yield advantage and carbon footprint of oat/sunflower relay strip intercropping depending on nitrogen fertilization
文献类型： 外文期刊
作者： Qian, Xin 1 ; Zhou, Jie 2 ; Luo, Bolun 2 ; Dai, Hongcui 3 ; Hu, Yuegao 2 ; Ren, Changzhong 4 ; Peixoto, Leanne 5 ; Guo, Laichun 4 ; Wang, Chunlong 4 ; Zamanian, Kazem 6 ; Zhao, Baoping 7 ; Zang, Huadong 2 ; Zeng, Zhaohai 2 ;
作者机构： 1.Shandong Acad Agr Sci, Maize Res Inst, Natl Engn Lab Wheat & Maize, Jinan 250100, Peoples R China
2.China Agr Univ, Coll Agron & Biotechnol, Beijing 100193, Peoples R China
3.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China
4.Baicheng Acad Agr Sci, Baicheng City 137000, Jilin, Peoples R China
5.Aarhus Univ, Dept Agroecol, Blichers Alle 20, DK-8830 Tjele, Denmark
6.Leibniz Univ Hannover, Inst Soil Sci, Herrenhauser Str 2, D-30419 Hannover, Germany
7.Inner Mongolia Agr Univ, Coll Agron, Hohhot 010019, Peoples R China
关键词： N fertilization; Strip intercropping; Border row effect; Yield; Carbon footprint
期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）
ISSN： 0032-079X
年卷期：
页码：
收录情况： SCI
摘要： Purpose Increasing crop yield to ensure global food security while decreasing carbon footprint (CF) is a challenge for sustainable agriculture. Although intercropping is suggested as a potential pathway in this regard, the balance between yield advantage and CF is unclear, especially under different nitrogen (N) application rates. Methods A two-year field experiment was conducted to investigate the effect of oat/sunflower intercropping and N application rates (0, 50, 100, and 150 kg ha(-1)) on yield advantages, N uptake, and CF. Results The overall land equivalent ratio of oat/sunflower intercropping decreased from 1.33 to 1.07 with increasing N fertilization, which implies the potential N reduction to maintain crop yield. Without fertilization, the yield advantage of intercropping was 28-32% and 18-47% higher for oat and sunflower, respectively compared with corresponding monocultures. However, this yield advantage decreased with increasing fertilization, especially for oat. The border rows contributed more than one-third of the yield for intercropped oat without N fertilization, but their contribution decreased with increasing N fertilization. However, the contribution of border rows to intercropped sunflower yield was independent of N fertilization and remained around 69-75%. Overall, oat/sunflower relay strip intercropping maximizes the productivity by border row effects due to reduced N fertilization demand. Furthermore, intercropping decreased the CF relative to monoculture, especially without N fertilization. Conclusion Intercropping can act as a win-win strategy for sustainable agriculture in Northwest China with higher productivity and lower carbon footprint.
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