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The plasticity of root distribution and nitrogen uptake contributes to recovery of maize growth at late growth stages in wheat/maize intercropping

文献类型： 外文期刊

作者： Liu, Yi-Xiang 1 ; Sun, Jian-Hao 4 ; Zhang, Fang-Fang 1 ; Li, Long 1 ;

作者机构： 1.China Agr Univ, Key Lab Plant & Soil Interact, Chinese Minist Educ, Coll Resources & Environm Sci, 2 Yuan Ming Yuan West Rd, Beijing 100193, Peoples R China

2.Yunnan Agr Univ, State Key Lab Conservat & Utilizat Bioresources Y, Kunming 650201, Yunnan, Peoples R China

3.Yunnan Agr Univ, Key Lab Agrobiodivers & Pest Management, Educ Minist China, Kunming 650201, Yunnan, Peoples R China

4.Gansu Acad Agr Sci, Inst Soils Fertilizers & Water Saving Agr, Lanzhou 730070, Peoples R China

关键词： Intercropping; Recovery growth; Root system architecture; Root length density; Root distribution; Nitrogen uptake per unit root length

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2020 年 447 卷 1-2 期

页码：

收录情况： SCI

摘要： Background and aims Previous studies showed that the competition-recovery principle is one of the mechanisms underpinning overyielding in wheat/maize intercropping. However, few studies have focused on the effects of root morphological and physiological changes during the recovery growth of late-maturing species. The present study aimed to determine the mechanism underlying the recovery growth in terms of root distribution and nitrogen (N) uptake in response to different N supplies. Methods The roots of maize were sampled three times by auger after wheat harvest in the intercropping system with six levels of N application and sole crops at one N-application rate under field condition. Results Intercropped maize adjusted its root length density (RLD) and root distribution and enhanced its N absorption per unit root length with increasing soil N concentration. Soil inorganic N concentration had a direct influence on RLD of intercropped maize which was related to shoot N concentration. In addition, maize took up 93% more N per unit root length when intercropped with maize compared with sole cropping. Conclusions Our findings show that the recovery growth of late-maturing species involves phenotypic plasticity of maize root architecture, and the enhanced N uptake resulted from extra soil N acquired from the area where wheat was growing before its harvest.

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