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Influence of intercropping Chinese milk vetch on the soil microbial community in rhizosphere of rape

  • Quan Zhou
  • Jiao Chen
  • Yi Xing
  • Xiaoyu XieEmail author
  • Longchang WangEmail author
Regular Article
  • 67 Downloads

Abstract

Aims

In comparison to the accumulated knowledge related to the legume-cereal intercrops, very little is known on both basic and applied aspects of the legume-brassica intercrops. In fact, the potential of legume-brassica intercrops was enormous to improve crop yields, biomass, nitrogen uptake, the economic reliability via land equivalent ratio, and so on. Therefore, in the present study, the Chinese milk vetch (Astragalus sinicus L.)-rape (Brassica napus L.) intercropping system was investigated. The specific objective of this study was to investigate how Chinese milk vetch affects the soil microbial community in rhizosphere of rape.

Methods

A series of bucket experiments based on Chinese milk vetch-rape intercrops, included root separation and straw mulching, were employed to explore the soil properties and soil microbes in rhizosphere of rape.

Results

Intercropping substantially decreased the organic carbon content and the total nitrogen content and changed the C/N ratios. Intercropping also decreased the soil microbial biomass in rape rhizosphere (including the total PLFAs, bacteria, actinomycete, AM-fungi, and so on). In addition, intercropping and straw mulching also changed the structure of soil microbial community in rape rhizosphere, which was significantly correlated with 16:1w9c and 18:3w6c (6, 9, 12). At the same time, under the influence of intercropping Chinese milk vetch, soil microbial functional activity in rape rhizosphere was significantly reduced. Soil microbial community functional composition in rape rhizosphere was also changed greatly by intercropping, which was significantly correlated with d-glucosaminic acid and g-1-phosphate under no straw mulching, and glycogen, d-xylose and 2-hydroxy benzoic acid under straw mulching.

Conclusions

Intercropping Chinese milk vetch decreased soil microbial biomass and functional activity and changed greatly the soil microbial community structural and functional composition in rape rhizosphere. Our findings revealed that root interaction between Chinese milk vetch and rape was a crucial factor to manage the crop intercropping, which might, in turn, determine the soil microbe on rhizosphere.

Keywords

Legume-brassica intercrops Chinese milk vetch Rape Root interaction Soil microbe 

Abbreviations

AWCD

Average well color development

PLFA

Phospholipid fatty acid

TC

Total carbon

TN

Total nitrogen

WSOC

Water-soluble organic carbon

G+

Gram-positive bacterium

G−

Gram-negative bacterium

Notes

Acknowledgments

We thank Dr. Elke Plaas from Department of Agricultural Economics and Rural Development, University of Göttingen, Germany for critical review of the manuscript.

Funding information

This study was financially supported by the Special Fund for Agro-scientific Research in the Public Interest (201503127) and the National Natural Science Foundation of China (31271673, 31871583).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.College of Agronomy and Biotechnology, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Engineering Research Center of South Upland Agriculture, Ministry of EducationSouthwest UniversityChongqingChina
  2. 2.Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi ProvinceJiangxi Agricultural UniversityNanchangChina

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