Soil organic carbon recovery in tropical tree plantations may depend on restoration of soil microbial composition and function

TitleSoil organic carbon recovery in tropical tree plantations may depend on restoration of soil microbial composition and function
Publication TypeJournal Article
Year of Publication2019
AuthorsBonner M.TL, Herbohn J., Gregorio N., Pasa A., Avela M.S, Solano C., Moreno M.OM, Almendras-Ferraren A., Wills J., Shoo L.P, Schmidt S.
JournalGeoderma
Volume353
Pagination70-80
Date PublishedNov
Type of ArticleArticle
ISBN Number0016-7061
Accession NumberWOS:000482513900007
KeywordsAgriculture, bacterial, biomass, Carbon sequestration, Community structure, decomposition, dynamics, ectomycorrhizal fungi, MATTER, secondary forest, sequestration, small mammals, Soil fungi and bacteria, soil organic matter, Tropical land use change, Tropical reforestation, use efficiency
Abstract

Soil organic carbon (SOC) supports essential functions in terrestrial biomes and global biogeochemical cycles, and tropical tree plantations are often called upon to reverse deforestation-induced SOC loss. Yet the comparative efficacy of different plantation types and associated drivers of SOC restoration remain unclear. Theory suggests that higher chemical and spatial heterogeneity of plant litter should promote greater efficiency of soil microbial communities involved in SOC formation, so we hypothesised that more species-diverse tree plantations should be more effective in accelerating recovery of SOC. To test this, we compared developmental recovery of SOC and soil microbial communities between monoculture (Swietenia macrophylla King, mahogany) and highly diverse and mostly native species plantations (termed "rainforestation"). All plantation types, which were aged 15 to 20 years, only restored the composition of the soil microbial community to 20-30% of the reference, selectively logged old-growth rainforest. Contrary to our hypothesis, mahogany plantations, but not rainforestation, restored SOC and microbial function. Rainforestation shifted soil microbial composition and the composition of the understory vegetation closer to reference conditions. Soil microbial composition at all plantation sites was correlated with plant composition and functional traits, and better explained variation in SOC than land use. In particular, soil fungal PLFA biomass displayed a strong positive correlation with topsoil SOC concentration. This suggests that belowground restoration with tropical reforestation is slow relative to typical rotation times of tropical plantations (15-20 years). We conclude that reliable and rapid restoration of SOC may depend on interventions both above and below ground to re-instate the soil microbial community. This may require careful selection of plant species in combination with microbial inoculations.

Alternate JournalGeoderma
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Times Cited: 0
Cited Reference Count: 100
Bonner, Mark T. L. Herbohn, John Gregorio, Nestor Pasa, Arturo Avela, Mayet S. Solano, Crisanto Moreno, Maria Opelia Maranguit Almendras-Ferraren, Angela Wills, Jarrah Shoo, Luke P. Schmidt, Susanne
Australian Centre for International Agricultural Research (ACIAR)Australian Ctr Intl Agr Res [ASEM/2010/050, ASEM/2016/103]
We would like to thank the landholders on Leyte Island in the Philippines who allowed site access and soil sampling for this study. We would also like to acknowledge Nova Santa Parcia for her invaluable logistical support in the Philippines, and Shi Ling Ling and Peter Mortimer at the World Agroforestry Centre in Kunming for support with sample processing. This study was funded by the Australian Centre for International Agricultural Research (ACIAR) through projects ASEM/2010/050 and ASEM/2016/103. The funding source had no role in study design, data collection, analysis and interpretation, writing the report, nor in the decision to submit for publication.

72
Elsevier
Amsterdam
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Bonner, MTL (reprint author), Swedish Univ Agr Sci, Dept Forest Ecol & Management, S-90736 Umea, Sweden.
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