Tree demographics and soil charcoal evidence of fire disturbances in an inaccessible forest atop the Mount Lico inselberg, Mozambique

A - Papers appearing in refereed journals

Mustaphi, C. J. C., Platts, P. J., Willcock, S., Timberlake, J. R., Osborne, J., Matimele, H., Osgood, H. S., Muiruri, V. M., Gehrels, M., Bayliss, J. and Marchant, R. 2024. Tree demographics and soil charcoal evidence of fire disturbances in an inaccessible forest atop the Mount Lico inselberg, Mozambique. Plants, people, planet. 7 (1), pp. 229-244. https://doi.org/10.1002/ppp3.10585

AuthorsMustaphi, C. J. C., Platts, P. J., Willcock, S., Timberlake, J. R., Osborne, J., Matimele, H., Osgood, H. S., Muiruri, V. M., Gehrels, M., Bayliss, J. and Marchant, R.
Abstract

(1) Research aims and rationale
The sheer rock cliffs of the Mount Lico inselberg, northern Mozambique, is relatively inaccessible to people. A 0.57 km2 forest covers the top of the isolated mountain and the tree demographics and soil offer an opportunity to investigate the long term fire ecology of the forests of the western, leeside of the mountain and potential for changing regional hydroclimate of the Late Holocene.

(2) Methods
On the western side of the mountaintop, a 20x20 m plot was surveyed for tree taxa , heights, and bole diameters. A 220 cm deep pit was dug into the forest soil and analysed to describe the soil texture and carbon content. C harcoal was quantified on sieved subsamples and classified into charcoal morphologies that were then grouped by how readily entrainable on an index score. Three radiocarbon dates were collected from pieces charcoal.

(3) Results
The forest is a combination of montane and woodland tree taxa that differed from the older, more mesic eastern side and reflected differential disturbance patterns. The reddish loam soils dated to the Middle Holocene. Charcoal was present in all soil subsamples and varied little until increasing consistently during the past millennium. The charcoal morphologies suggested a combination of locally-derived charcoal and charcoal derived from the surrounding lowlands with the latter increasing in the past centuries.

(4) Main conclusions
Few Holocene paleoenvironmental records have been developed from tropical soils in Africa and are useful in locations that do not host lakes and wetlands. Both tree demographics and soil charcoal suggest that changing forest disturbance regimes began during the past millennium. An understanding of history informs future conservation and appropriate management of these special places.

KeywordsCharcoal morphology; Disturbance ecology; Embers; Entrainment; Forest fires; Refugia; Taphonomy; Tropics
Year of Publication2024
JournalPlants, people, planet
Journal citation7 (1), pp. 229-244
Digital Object Identifier (DOI)https://doi.org/10.1002/ppp3.10585
Open accessPublished as ‘gold’ (paid) open access
Publisher's version
Copyright license
CC BY
Accepted author manuscript
Supplemental file
Output statusPublished
Publication dates
Online02 Oct 2024
PrintJan 2025
Publication process dates
Accepted03 Sep 2024
PublisherNew Phytologist Foundation
ISSN2572-2611

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