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Biochar increases arbuscular mycorrhizal plant growth enhancement and ameliorates salinity stress

Author:
  • Edith Hammer
  • Manfred Forstreuter
  • Matthias C. Rillig
  • Josef Kohler
Publishing year: 2015
Language: English
Pages: 114-121
Publication/Series: Agriculture, Ecosystems & Environment. Applied Soil Ecology
Volume: 96
Document type: Journal article
Publisher: Elsevier

Abstract english

We examined combined effects of biochar, arbuscular mycorrhizal (AM) fungi and salinity on plant growth and physiology to test whether and how biochar influences AM fungi mediated growth and nutrition enhancements, and whether and how biochar provides amelioration in salt stressed soils. We carried out a full three-factorial greenhouse experiment with Lactuca sativa; and a second study with a wider range of biochar and salt additions to examine physicochemical effects on soil parameters. Biochar together with AM fungal inoculation resulted in an additional plant yield increase compared to each alone under non-saline conditions. In parallel with increased plant growth, we found increased uptake of P and Mn with AM fungi and biochar addition, but to a lesser extent than biochar-induced growth promotion. Both factors, but especially biochar alleviated salinity-caused growth depressions, and improved Na/K ratio in salinity stressed plants. Reduced Na uptake of plants and reduced conductivity in biochar-ameliorated soils suggest that a likely mechanism involves ion adsorption to biochar surfaces. Our results suggest that plants depend on symbiotic microorganisms to fully exploit biochar benefits in soils, suggesting avenues for joint management in agriculture. Biochar may be advantageous in saline soils, but long-term studies are required before recommendations should be given. (C) 2015 Elsevier B.V. All rights reserved.

Keywords

  • Soil Science
  • Biochar
  • Black carbon
  • Salt stress
  • Mycorrhiza
  • Soil improvement
  • Salt
  • sorption

Other

Published
  • ISSN: 0929-1393
Edith Hammer
E-mail: edith [dot] hammer [at] biol [dot] lu [dot] se

Associate senior lecturer

MEMEG

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Research group

Microbial Ecology

Projects

MICCS

PhD students and postdocs

PhD students, main supervisor

Carlos Arellano

Postdocs

Kristin Aleklett