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Imaging spectroscopy reveals the effects of topography and logging on the leaf chemistry of tropical forest canopy trees

T. Swinfield, S. Both, T. Riutta, B. Bongalov, D. Elias, N. Majalap-Lee, N. Ostle, M. Svátek, J. Kvasnica, D. Milodowski, T. Jucker, RM. Ewers, Y. Zhang, D. Johnson, YA. Teh, DFRP. Burslem, Y. Malhi, D. Coomes,

. 2020 ; 26 (2) : 989-1002. [pub] 20191217

Jazyk angličtina Země Velká Británie

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc20005617

Grantová podpora
INTER-TRANSFER LTT17017 Ministry of Education, Youth and Sports of the Czech Republic - International
Sime Darby Foundation - International
NE/K016377/1 Natural Environment Research Council - International
Leverhulme Trust - International
Frank Jackson Trust - International

Logging, pervasive across the lowland tropics, affects millions of hectares of forest, yet its influence on nutrient cycling remains poorly understood. One hypothesis is that logging influences phosphorus (P) cycling, because this scarce nutrient is removed in extracted timber and eroded soil, leading to shifts in ecosystem functioning and community composition. However, testing this is challenging because P varies within landscapes as a function of geology, topography and climate. Superimposed upon these trends are compositional changes in logged forests, with species with more acquisitive traits, characterized by higher foliar P concentrations, more dominant. It is difficult to resolve these patterns using traditional field approaches alone. Here, we use airborne light detection and ranging-guided hyperspectral imagery to map foliar nutrient (i.e. P, nitrogen [N]) concentrations, calibrated using field measured traits, over 400 km2 of northeastern Borneo, including a landscape-level disturbance gradient spanning old-growth to repeatedly logged forests. The maps reveal that canopy foliar P and N concentrations decrease with elevation. These relationships were not identified using traditional field measurements of leaf and soil nutrients. After controlling for topography, canopy foliar nutrient concentrations were lower in logged forest than in old-growth areas, reflecting decreased nutrient availability. However, foliar nutrient concentrations and specific leaf area were greatest in relatively short patches in logged areas, reflecting a shift in composition to pioneer species with acquisitive traits. N:P ratio increased in logged forest, suggesting reduced soil P availability through disturbance. Through the first landscape scale assessment of how functional leaf traits change in response to logging, we find that differences from old-growth forest become more pronounced as logged forests increase in stature over time, suggesting exacerbated phosphorus limitation as forests recover.

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$a Swinfield, Tom $u Forest Ecology and Conservation Group, Department of Plant Sciences, University of Cambridge, Cambridge, UK. Centre for Conservation Science, Royal Society for the Protection of Birds, Cambridge, UK.
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$a Imaging spectroscopy reveals the effects of topography and logging on the leaf chemistry of tropical forest canopy trees / $c T. Swinfield, S. Both, T. Riutta, B. Bongalov, D. Elias, N. Majalap-Lee, N. Ostle, M. Svátek, J. Kvasnica, D. Milodowski, T. Jucker, RM. Ewers, Y. Zhang, D. Johnson, YA. Teh, DFRP. Burslem, Y. Malhi, D. Coomes,
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$a Logging, pervasive across the lowland tropics, affects millions of hectares of forest, yet its influence on nutrient cycling remains poorly understood. One hypothesis is that logging influences phosphorus (P) cycling, because this scarce nutrient is removed in extracted timber and eroded soil, leading to shifts in ecosystem functioning and community composition. However, testing this is challenging because P varies within landscapes as a function of geology, topography and climate. Superimposed upon these trends are compositional changes in logged forests, with species with more acquisitive traits, characterized by higher foliar P concentrations, more dominant. It is difficult to resolve these patterns using traditional field approaches alone. Here, we use airborne light detection and ranging-guided hyperspectral imagery to map foliar nutrient (i.e. P, nitrogen [N]) concentrations, calibrated using field measured traits, over 400 km2 of northeastern Borneo, including a landscape-level disturbance gradient spanning old-growth to repeatedly logged forests. The maps reveal that canopy foliar P and N concentrations decrease with elevation. These relationships were not identified using traditional field measurements of leaf and soil nutrients. After controlling for topography, canopy foliar nutrient concentrations were lower in logged forest than in old-growth areas, reflecting decreased nutrient availability. However, foliar nutrient concentrations and specific leaf area were greatest in relatively short patches in logged areas, reflecting a shift in composition to pioneer species with acquisitive traits. N:P ratio increased in logged forest, suggesting reduced soil P availability through disturbance. Through the first landscape scale assessment of how functional leaf traits change in response to logging, we find that differences from old-growth forest become more pronounced as logged forests increase in stature over time, suggesting exacerbated phosphorus limitation as forests recover.
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$a Both, Sabine $u School of Biological Sciences, University of Aberdeen, Aberdeen, UK. Environmental and Rural Science, University of New England, Armidale, NSW, Australia.
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$a Riutta, Terhi $u Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK.
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$a Bongalov, Boris $u Forest Ecology and Conservation Group, Department of Plant Sciences, University of Cambridge, Cambridge, UK.
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$a Ostle, Nicholas $u Lancaster Environment Centre, Lancaster University, Lancaster, UK.
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$a Svátek, Martin $u Department of Forest Botany, Dendrology and Geobiocoenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic.
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$a Kvasnica, Jakub $u Department of Forest Botany, Dendrology and Geobiocoenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic.
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$a Milodowski, David $u School of GeoSciences, University of Edinburgh, Edinburgh, UK. National Centre for Earth Observation, University of Edinburgh, Edinburgh, UK.
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$a Jucker, Tommaso $u School of Biological Sciences, University of Bristol, Bristol, UK.
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$a Johnson, David $u School of Earth and Environmental Sciences, The University of Manchester, Manchester, UK.
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