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Root and arbuscular mycorrhizal mycelial interactions with soil microorganisms in lowland tropical forest

Nottingham, Andrew T.; Turner, Benjamin L.; Winter, Klaus; Chamberlain, Paul M.; Stott, Andrew; Tanner, Edmund V.J.. 2013 Root and arbuscular mycorrhizal mycelial interactions with soil microorganisms in lowland tropical forest. FEMS Microbiology Ecology, 85 (1). 37-50. 10.1111/1574-6941.12096

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Abstract/Summary

Tropical forests have high rates of soil carbon cycling, but little information is available on how roots, arbuscular mycorrhizal fungi (AMF), and free-living microorganisms interact and influence organic matter mineralization in these ecosystems. We used mesh ingrowth cores and isotopic tracers in phospholipid fatty acid biomarkers to investigate the effects of roots and AMF mycelia on (1) microbial community composition, microbial carbon utilization, and hydrolytic enzyme activities for large, potted tropical trees and (2) enzyme activities and litter mass loss in a lowland tropical forest. Under the tropical tree, plant-derived carbon was incorporated predominantly into bacterial groups in both rhizosphere and AMF-only soils. Gram-positive bacteria incorporated additional soil-derived carbon in rhizosphere soils, which also contained the highest microbial biomass. For hydrolytic enzymes, β-glucosidase and N-acetyl β-glucosaminidase activities were highest in rhizosphere soils, while phosphomonoesterase activity was highest in AMF-only soil. In the forest, leaf litter mass loss was increased by the presence of roots, but not by the presence of AMF mycelia only. Root–microbial interactions influenced organic matter cycling, with evidence for rhizosphere priming and accelerated leaf litter decomposition in the presence of roots. Although AMF mycelia alone did not stimulate organic matter mineralization, they were a conduit of carbon to other soil microorganisms.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/1574-6941.12096
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.2 - Measure and model surface atmosphere exchanges of energy ...
CEH Topics & Objectives 2009 - 2012 > Biogeochemistry
CEH Sections: Shore
Parr
ISSN: 0168-6496
Additional Keywords: arbuscular mycorrhizal fungi, hydrolytic enzymes, phospholipid fatty acids, Pseudobombax septenatum, soil microorganisms, soil organic matter, tropical forest
NORA Subject Terms: Ecology and Environment
Date made live: 14 Aug 2013 15:24 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/502961

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