Soil Fungal Community Characteristics and Mycelial Production Across a Disturbance Gradient in Lowland Dipterocarp Rainforest in Borneo

Frontiers in Forests and Global Change

David Johnson¹  Niall P. McNamara²  Sabine Both³  Tim Goodall⁴  Terhi Riutta⁵  Robert Griffiths⁷  Samuel J. B. Robinson⁸  Nick Ostle⁹  Dafydd Elias⁹  Noreen Majalap⁹ 

[1] Hydrology, Lancaster, United Kingdom;Hydrology, Wallingford, United Kingdom;Department of Earth and Environmental Sciences, The University of Manchester, Manchester, United Kingdom;Department of Life Sciences, Imperial College London, Silwood Park, Ascot, United Kingdom;Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, United Kingdom;Environmental and Rural Science, University of New England, Armidale, NSW, Australia;Forest Research Centre, Sabah Forestry Department, Sandakan, Malaysia;Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom;;UK Centre for Ecology &

关键词: oil palm;    selective logging;    mycorrhiza;    arbuscular;    ectomycorrhizal;    hyphae;   

DOI  :  10.3389/ffgc.2020.00064

来源: DOAJ

【 摘 要 】

The rainforests of Southeast Asia are a global biodiversity hotspot under increasing pressure from human activity. Selective logging and forest conversion to oil palm plantation has major implications for biogeochemical cycling and carbon storage that are underpinned by plant-soil interactions. Soil fungi are key regulators of carbon and mineral nutrient flows between above- and below-ground organisms, yet understanding of fungal community-productivity relationships in hyper-diverse tropical forests is lacking. Recent studies suggest sensitivity of soil fungal communities to land-use change, although impacts on fungal productivity remain largely unresolved. To address this gap, we installed hyphal in-growth bags for 6 months in old-growth (OG) and selectively logged (SL) forest and oil palm plantation (OP) in Bornean lowland rainforest. Mycelial (actively foraging) fungal communities were characterized by ITS amplicon sequencing, and mycelial production estimated by measurement of fungal hyphae. Mycelial fungal community compositions were similar in OG and SL forest, whereas OP had significantly different communities of saprotrophic, mycorrhizal, and pathogenic fungi. In particular, total mycorrhizal and ectomycorrhizal fungal relative abundances, total mycorrhizal richness and mycelial production was reduced. However, due to restricted sampling replication in OP, effects associated with site could not be excluded. In forest plots (OG & SL), we further explored the broader drivers of mycelial fungal communities using tree community, structure and productivity data, and soil and environmental properties. Forest mycelial community dissimilarities were related to soil and vegetation characteristics, while mycelial production was broadly independent of these as well as fungal community attributes. An increase in arbuscular mycorrhizal relative abundance was also found with selective logging, which may have implications for carbon storage capacity in these forests, while an apparent retention of mycorrhizal mycelium in SL forest may act as a reservoir of inoculum that could aid forest restoration. Our results show that conversion of rainforest to oil palm plantation has significant consequences for fungal diversity-productivity relationships with implications for nutrient and carbon dynamics and restoration over large spatial scales.

【 授权许可】

Unknown