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Crop diversity facilitates soil aggregation in relation to soil microbial community composition driven by intercropping

文献类型： 外文期刊

作者： Tian, Xiu-li 1 ; Wang, Cheng-bao 2 ; Bao, Xing-guo 2 ; Wang, Ping 3 ; Li, Xiao-fei 1 ; Yang, Si-cun 2 ; Ding, Guo-chun 1 ;

作者机构： 1.China Agr Univ, Beijing Key Lab Biodivers & Organ Farming, Coll Resources & Environm Sci, Key Lab Plant & Soil Interact,Chinese Minist Educ, Beijing 100193, Peoples R China

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

3.Ningxia Acad Agr & Forestry, Inst Crop Sci, Yinchuan 750105, Ningxia, Peoples R China

关键词： Arbuscular mycorrhizal fungi; Crop diversity; Intercropping; Legumes; Long-term field experiments; Maize; Nitrospirae; Soil aggregates; Sordariales

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： 2019 年 436 卷 1-2 期

页码：

收录情况： SCI

摘要： Background and AimsStudies verify that intercropping increases soil macro-aggregates but the mechanism underlying the increase is poorly understood.MethodsThree long-term field experiments were conducted starting in 2009 at three sites in an oasis in northwest China. The first was a split-plot design: Rhizobium (with or without inoculation) and three cropping systems (faba bean/maize intercropping and corresponding monocultures). The second and third experiments were both single-factorial randomized block designs with nine cropping systems (maize intercropped with faba bean, chickpea, soybean, or oilseed rape, and the corresponding monocultures). Soil aggregates were determined by the wet sieving method. Microbial biomass and community composition in 2015 and 2016 were determined by phospholipid fatty acid (PLFA) and high throughput sequencing analysis of 16S rRNA.ResultsSoil macro-aggregates (> 2mm) in intercropping systems increased by 15.5-58.6% across three sites and two years, an effect derived partly from increased relative abundance of soil Sordariales, from enhanced arbuscular mycorrhizal fungi biomass, or from reduced relative abundance of Nitrospirae, depending on soil type.ConclusionsIntercropping alters soil microbial community composition and further facilitates soil aggregation. These findings provide insights into the mechanisms underlying the maintenance of biodiversity in ecosystem functioning.

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