Giglio, L., Schroeder, W. & Justice, C. O. The collection 6 MODIS active fire detection algorithm and fire products. Remote Sens. Environ. 178, 31–41 (2016).
Grace, J., José, J. S., Meir, P., Miranda, H. S. & Montes, R. A. Productivity and carbon fluxes of tropical savannas. J. Biogeogr. 33, 387–400 (2006).
Van Der Werf, G. R. et al. Global fire emissions estimates during 1997–2016. Earth Syst. Sci. Data 9, 697–720 (2017).
Bastin, J.-F. et al. The global tree restoration potential. Science 365, 76–79 (2019).
Russell-Smith, J. et al. Opportunities and challenges for savanna burning emissions abatement in southern Africa. J. Environ. Manage. 288, 112414 (2021).
Andela, N. et al. A human-driven decline in global burned area. Science 356, 1356–1362 (2017).
Wu, C. et al. Historical and future global burned area with changing climate and human demography. One Earth 4, 517–530 (2021).
Pellegrini, A. F. A. et al. Fire frequency drives decadal changes in soil carbon and nitrogen and ecosystem productivity. Nature 553, 194–198 (2018).
Higgins, S. I. et al. Effects of four decades of fire manipulation on woody vegetation structure in savanna. Ecology 88, 1119–1125 (2007).
Staver, A. C., Archibald, S. & Levin, S. A. The global extent and determinants of savanna and forest as alternative biome states. Science 334, 230–232 (2011).
Shi, Z. et al. The age distribution of global soil carbon inferred from radiocarbon measurements. Nat. Geosci. 13, 555–559 (2020).
Pellegrini, A. F. A., Hedin, L. O., Staver, A. C. & Govender, N. Fire alters ecosystem carbon and nutrients but not plant nutrient stoichiometry or composition in tropical savanna. Ecology 96, 1275–1285 (2015).
Tilman, D. et al. Fire suppression and ecosystem carbon storage. Ecology 81, 2680–2685 (2000).
Mokany, K., Raison, R. J. & Prokushkin, A. S. Critical analysis of root:shoot ratios in terrestrial biomes. Glob. Change Biol. 12, 84–96 (2006).
de Miranda, S. D. C. et al. Regional variations in biomass distribution in Brazilian savanna woodland. Biotropica 46, 125–138 (2014).
Wigley, B. J., Cramer, M. D. & Bond, W. J. Sapling survival in a frequently burnt savanna: mobilisation of carbon reserves in Acacia karroo. Plant Ecol. 203, 1 (2009).
Sankaran, M. et al. Determinants of woody cover in African savannas. Nature 438, 846–849 (2005).
Staver, A. C., Botha, J. & Hedin, L. Soils and fire jointly determine vegetation structure in an African savanna. New Phytol. 216, 1151–1160 (2017).
Zhou, Y., Wigley, B. J., Case, M. F., Coetsee, C. & Staver, A. C. Rooting depth as a key woody functional trait in savannas. New Phytol. 227, 1350–1361 (2020).
Govender, N., Trollope, W. S. W., Van, & Wilgen, B. W. The effect of fire season, fire frequency, rainfall and management on fire intensity in savanna vegetation in South Africa. J. Appl. Ecol. 43, 748–758 (2006).
Colgan, M. S., Asner, G. P. & Swemmer, T. Harvesting tree biomass at the stand level to assess the accuracy of field and airborne biomass estimation in savannas. Ecol. Appl. 23, 1170–1184 (2013).
Davies, A. B. & Asner, G. P. Elephants limit aboveground carbon gains in African savannas. Glob. Change Biol. 25, 1368–1382 (2019).
Butnor, J. R. et al. Utility of ground-penetrating radar as a root biomass survey tool in forest systems. Soil Sci. Soc. Am. J. 67, 1607–1615 (2003).
Staver, A. C., Wigley-Coetsee, C. & Botha, J. Grazer movements exacerbate grass declines during drought in an African savanna. J. Ecol. 107, 1482–1491 (2019).
Ryan, C. M., Williams, M. & Grace, J. Above- and belowground carbon stocks in a miombo woodland landscape of Mozambique. Biotropica 43, 423–432 (2011).
Swezy, D. M. & Agee, J. K. Prescribed-fire effects on fine-root and tree mortality in old-growth ponderosa pine. Can. J. For. Res. 21, 626–634 (1991).
Canadell, J. et al. Maximum rooting depth of vegetation types at the global scale. Oecologia 108, 583–595 (1996).
Coetsee, C., Bond, W. J. & February, E. C. Frequent fire affects soil nitrogen and carbon in an African savanna by changing woody cover. Oecologia 162, 1027–1034 (2010).
Holdo, R. M., Mack, M. C. & Arnold, S. G. Tree canopies explain fire effects on soil nitrogen, phosphorus and carbon in a savanna ecosystem. J. Veg. Sci. 23, 352–360 (2012).
Lloyd, J. et al. Contributions of woody and herbaceous vegetation to tropical savanna ecosystem productivity: a quasi-global estimate. Tree Physiol. 28, 451–468 (2008).
Wigley, B. J., Augustine, D. J., Coetsee, C., Ratnam, J. & Sankaran, M. Grasses continue to trump trees at soil carbon sequestration following herbivore exclusion in a semiarid African savanna. Ecology 101, e03008 (2020).
Khomo, L., Trumbore, S., Bern, C. R. & Chadwick, O. A. Timescales of carbon turnover in soils with mixed crystalline mineralogies. Soil 3, 17–30 (2017).
Six, J., Conant, R. T., Paul, E. A. & Paustian, K. Stabilization mechanisms of soil organic matter: implications for C-saturation of soils. Plant Soil 241, 155–176 (2002).
Abreu, R. C. R. et al. The biodiversity cost of carbon sequestration in tropical savanna. Sci. Adv. 3, e1701284 (2017).
Bond, W. J., Stevens, N., Midgley, G. F. & Lehmann, C. E. The trouble with trees: afforestation plans for Africa. Trends Ecol. Evol. 34, 963–965 (2019).
West, T. A., Börner, J. & Fearnside, P. M. Climatic benefits from the 2006–2017 avoided deforestation in Amazonian Brazil. Front. For. Glob. Change 2, 52 (2019).
Aleman, J. C., Blarquez, O. & Staver, C. A. Land-use change outweighs projected effects of changing rainfall on tree cover in sub-Saharan Africa. Glob. Change Biol. 22, 3013–3025 (2016).
Huang, J., Yu, H., Guan, X., Wang, G. & Guo, R. Accelerated dryland expansion under climate change. Nat. Clim. Change 6, 166–171 (2016).
Ratajczak, Z., Nippert, J. B. & Collins, S. L. Woody encroachment decreases diversity across North American grasslands and savannas. Ecology 93, 697–703 (2012).
Smit, I. P. & Prins, H. H. Predicting the effects of woody encroachment on mammal communities, grazing biomass and fire frequency in African savannas. PLoS One 10, e0137857 (2015).
Huxman, T. E. et al. Ecohydrological implications of woody plant encroachment. Ecology 86, 308–319 (2005).
Hermoso, V., Regos, A., Morán-Ordóñez, A., Duane, A. & Brotons, L. Tree planting: a double-edged sword to fight climate change in an era of megafires. Glob. Change Biol. 27, 3001–3003 (2021).
Venter F. A. Classification of Land for Management Planning in the Kruger National Park. PhD thesis, Univ. South Africa (1990).
Biggs, R., Biggs, H. C., Dunne, T. T., Govender, N. & Potgieter, A. L. F. Experimental burn plot trial in the Kruger National Park: history, experimental design and suggestions for data analysis. Koedoe 46, 15 (2003).
Codron, J. et al. Taxonomic, anatomical, and spatio-temporal variations in the stable carbon and nitrogen isotopic compositions of plants from an African savanna. J. Archaeol. Sci. 32, 1757–1772 (2005).
Zhou, Y., Boutton, T. W. & Ben Wu, X. Soil carbon response to woody plant encroachment: importance of spatial heterogeneity and deep soil storage. J. Ecol. 105, 1738–1749 (2017).
Sheldrick B. & Wang C. In Soil Sampling and Methods of Analysis (ed. Carter, M. R.) 499–511 (CRC Press, 1993).
Butnor, J. R. et al. Surface-based GPR underestimates below-stump root biomass. Plant Soil 402, 47–62 (2016).
Pau, G., Fuchs, F., Sklyar, O., Boutros, M. & Huber, W. EBImage—an R package for image processing with applications to cellular phenotypes. Bioinformatics 26, 979–981 (2010).
Hirano, Y. et al. Limiting factors in the detection of tree roots using ground-penetrating radar. Plant Soil 319, 15–24 (2009).
Popescu, S. C. & Wynne, R. H. Seeing the trees in the forest. Photogramm. Eng. Remote Sensing 70, 589–604 (2004).
Case, M. F., Wigley-Coetsee, C., Nzima, N., Scogings, P. F. & Staver, A. C. Severe drought limits trees in a semi-arid savanna. Ecology 100, e02842 (2019).
Beucher S. & Meyer F. In Mathematical Morphology in Image Processing (ed. Dougherty, E. R.) 433–481 (CRC Press, 1993).
Nickless, A., Scholes, R. J. & Archibald, S. A method for calculating the variance and confidence intervals for tree biomass estimates obtained from allometric equations. S. Afr. J. Sci. 107, 1–10 (2011).
Plowright A. & Roussel J.-R. ForestTools: analyzing remotely sensed forest data. R package version 0.2.1. https://CRAN.R-project.org/package=ForestTools (2020).
Hijmans R. J. raster: geographic data analysis and modeling. R package version 3.3-7. https://CRAN.R-project.org/package=raster (2020).
Penman J. et al. (eds) Good Practice Guidance for Land Use, Land-Use Change and Forestry (Intergovernmental Panel on Climate Change, 2003).
Kuznetsova, A., Brockhoff, P. & Christensen, R. lmerTest package: tests in linear mixed effects models. J. Stat. Softw. 82, 1–26 (2017).
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