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The niche complementarity driven by rhizosphere interactions enhances phosphorus-use efficiency in maize/alfalfa mixture

文献类型： 外文期刊

作者： Wang, Liyang 1 ; Hou, Baicheng 1 ; Zhang, Deshan 2 ; Lyu, Yang 1 ; Zhang, Kai 1 ; Li, Haigang 3 ; Rengel, Zed 4 ; Shen, J 1 ;

作者机构： 1.China Agr Univ, Natl Acad Agr Green Dev, Coll Resources & Environm Sci,Minist Educ,Dept Pl, Key Lab Plant Soil Interact,Ctr Resources Environ, Beijing, Peoples R China

2.Shanghai Acad Agr Sci, Shanghai Low Carbon Agr Tech Engn Res Ctr, Inst Ecol Environm Protect Res, Shanghai Key Lab Protected Hort Technol, Shanghai, Peoples R China

3.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm, Hohhot, Peoples R China

4.Univ Western Australia, UWA Sch Agr & Environm, Soil Sci & Plant Nutr, Perth, WA, Australia

5.Inst Adriat Crops & Karst Reclamat, Split, Croatia

关键词： Alfalfa (Medicago sativa L.); intercropping; Maize (Zea mays L.); phosphorus uptake; rhizosphere processes

期刊名称：FOOD AND ENERGY SECURITY （ 影响因子：4.109； 五年影响因子：8.33 ）

ISSN： 2048-3694

年卷期：

页码：

收录情况： SCI

摘要： Rhizosphere interactions between intercropping maize and alfalfa to increase phosphorus (P) acquisition remain largely unknown. This study aimed to investigate the mechanisms underlying niche complementarity to increase P acquisition in the maize/alfalfa mixture by influencing root/rhizosphere interactions. Maize was grown alone (single maize) or with maize (maize/maize) or alfalfa (maize/alfalfa) with low P (30 mg P kg(-1)soil) and high P (150 mg P kg(-1)soil) supplies. The target maize had greater shoot biomass and P content when grown with alfalfa than maize. Compared with maize, alfalfa had higher secretion of carboxylates and acid phosphatase, suggesting a stronger capacity to mobilize soil P. Phosphorus deficiency also increased the specific root length and the proportion of thin roots (diameter < 0.2 mm) in alfalfa, and intercropped alfalfa had higher carboxylates secretion than monocropped one, indicating that alfalfa root traits were modified by both soil P supply and the identity of neighbor. Increased soil P availability by alfalfa root exudation and improved rhizosphere environment by thin alfalfa roots promoted shoot growth and P acquisition of maize in the maize/alfalfa mixture. The presence of maize increased the secretion of carboxylates from alfalfa roots, suggesting that the root interactions between maize and alfalfa are crucial for improving P-use efficiency and productivity in intercropping.

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