Phosphorus uptake and rhizosphere properties of intercropped and monocropped maize, faba bean, and white lupin in acidic soil

被引:130
作者
Li, Haigang [2 ]
Shen, Jianbo [2 ]
Zhang, Fusuo [2 ]
Marschner, Petra [1 ]
Cawthray, Greg [3 ]
Rengel, Zed [4 ]
机构
[1] Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia
[2] China Agr Univ, Dept Plant Nutr, Key Lab Plant Soil Interact, Minist Educ, Beijing 100193, Peoples R China
[3] Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia
[4] Univ Western Australia, Sch Earth & Geog Sci, Crawley, WA 6009, Australia
基金
中国国家自然科学基金; 澳大利亚研究理事会;
关键词
Carboxylate exudation; Intercropping; Microbial community structure; P uptake; PLFAs; Rhizosphere pH; TRITICUM-AESTIVUM L; ZEA-MAYS L; BACTERIAL COMMUNITY COMPOSITION; CLUSTER-ROOT-FORMATION; PHASEOLUS-VULGARIS L; MICROBIAL COMMUNITY; ORGANIC-ACIDS; PROTON RELEASE; MIXED CULTURE; P-UPTAKE;
D O I
10.1007/s00374-009-0411-x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Little information is available on phosphorus (P) uptake and rhizosphere processes in maize (Zea mays L.), faba bean (Vicia faba L.), and white lupin (Lupinus albus L.) when intercropped or grown alone in acidic soil. We studied P uptake and soil pH, carboxylate concentration, and microbial community structure in the rhizosphere of maize, faba bean, and white lupin in an acidic soil with 0-250 mg P (kg(-1) soil) as KH2PO4 (KP) or FePO4 (FeP) with species grown alone or intercropped. All plant species increased the pH compared to unplanted control, particularly faba bean. High KP supply (> 100 mg P kg(-1)) significantly increased carboxylate concentration in the rhizosphere of maize. The carboxylate composition of the rhizosphere soil of maize and white lupin was significantly affected by P form (KP or FeP), whereas, this was not the case for faba bean. In maize, the carboxylate composition of the rhizosphere soil differed significantly between intercropping and monocropping. Yield and P uptake were similar in monocropping and intercropping. Monocropped faba bean had a greater concentration of phospholipid fatty acids in the rhizosphere than that in intercropping. Intercropping changed the microbial community structure in faba bean but not in the other corps. The results show that P supply and P form, as well as intercropping can affect carboxylate concentration and microbial community composition in the rhizosphere, but that the effect is plant species-specific. In contrast to previous studies in alkaline soils, intercropping of maize with legumes did not result in increased maize growth suggesting that the legumes did not increase P availability to maize in this acidic soil.
引用
收藏
页码:79 / 91
页数:13
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