Title | Tropical Rainforest Restoration Plantations Are Slow to Restore the Soil Biological and Organic Carbon Characteristics of Old Growth Rainforest |
Publication Type | Journal Article |
Year of Publication | 2020 |
Authors | Bonner M.TL, Allen D.E, Brackin R., Smith T.E, Lewis T., Shoo L.P, Schmidt S. |
Journal | Microbial Ecology |
Volume | 79 |
Pagination | 432-442 |
Date Published | Feb |
Type of Article | Article |
ISBN Number | 0095-3628 |
Accession Number | WOS:000514980800014 |
Keywords | aboveground biomass, amino-acids, decomposition, diversity, Environmental Sciences & Ecology, Land use change, land-use, Marine & Freshwater Biology, MATTER, microbial communities, Microbial ecology, Microbial function and composition, Microbiology, Mixed-species plantations, nitrogen, plant, sequestration, Soil carbon, Soil fungi and bacteria, use efficiency |
Abstract | Widespread and continuing losses of tropical old-growth forests imperil global biodiversity and alter global carbon (C) cycling. Soil organic carbon (SOC) typically declines with land use change from old-growth forest, but the underlying mechanisms are poorly understood. Ecological restoration plantations offer an established means of restoring aboveground biomass, structure and diversity of forests, but their capacity to recover the soil microbial community and SOC is unknown due to limited empirical data and consensus on the mechanisms of SOC formation. Here, we examine soil microbial community response and SOC in tropical rainforest restoration plantings, comparing them with the original old-growth forest and the previous land use (pasture). Two decades post-reforestation, we found a statistically significant but small increase in SOC in the fast-turnover particulate C fraction. Although the delta C-13 signature of the more stable humic organic C (HOC) fraction indicated a significant compositional turnover in reforested soils, from C-4 pasture-derived C to C-3 forest-derived C, this did not translate to HOC gains compared with the pasture baseline. Matched old-growth rainforest soils had significantly higher concentrations of HOC than pasture and reforested soils, and soil microbial enzyme efficiency and the ratio of gram-positive to gram-negative bacteria followed the same pattern. Restoration plantings had unique soil microbial composition and function, distinct from baseline pasture but not converging on target old growth rainforest within the examined timeframe. Our results suggest that tropical reforestation efforts could benefit from management interventions beyond re-establishing tree cover to realize the ambition of early recovery of soil microbial communities and stable SOC.
|
Short Title | Microb Ecol |
Alternate Journal | Microb. Ecol. |
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Bonner, Mark T. L. Allen, Diane E. Brackin, Richard Smith, Tim E. Lewis, Tom Shoo, Luke P. Schmidt, Susanne
schmidt, susanne/0000-0001-8369-1238
Swedish University of Agricultural Sciences
Open access funding provided by Swedish University of Agricultural Sciences.
Springer
New york
1432-184x
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Bonner, MTL (reprint author), Univ Queensland, Sch Agr & Food Sci, Brisbane, Qld 4072, Australia.; Bonner, MTL (reprint author), Swedish Univ Agr Sci, Dept Forest Ecol & Management, S-90736 Umea, Sweden.
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