Abstract
Land-use change occurs nowhere more rapidly than in the tropics, where the imbalance between deforestation and forest regrowth has large consequences for the global carbon cycle1. However, considerable uncertainty remains about the rate of biomass recovery in secondary forests, and how these rates are influenced by climate, landscape, and prior land use2,3,4. Here we analyse aboveground biomass recovery during secondary succession in 45 forest sites and about 1,500 forest plots covering the major environmental gradients in the Neotropics. The studied secondary forests are highly productive and resilient. Aboveground biomass recovery after 20 years was on average 122âmegagrams per hectare (Mgâhaâ1), corresponding to a net carbon uptake of 3.05âMgâCâhaâ1âyrâ1, 11 times the uptake rate of old-growth forests. Aboveground biomass stocks took a median time of 66 years to recover to 90% of old-growth values. Aboveground biomass recovery after 20 years varied 11.3-fold (from 20 to 225âMgâhaâ1) across sites, and this recovery increased with water availability (higher local rainfall and lower climatic water deficit). We present a biomass recovery map of Latin America, which illustrates geographical and climatic variation in carbon sequestration potential during forest regrowth. The map will support policies to minimize forest loss in areas where biomass resilience is naturally low (such as seasonally dry forest regions) and promote forest regeneration and restoration in humid tropical lowland areas with high biomass resilience.
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Acknowledgements
This paper is a product of the 2ndFOR collaborative research network on secondary forests. We thank the owners of the secondary forest sites for access to their forests, all the people who have established and measured the plots, and the institutions and funding agencies that supported them. We thank J. Zimmerman for the use of plot data, and the following agencies for financial support: Australian Department of Foreign Affairs and Trade-DFAT, CGIAR-FTA, CIFOR, Colciencias grant 1243-13-16640, Consejo Nacional de Ciencia y TecnologÃa (SEP-CONACYT 2009-129740 for ReSerBos, CONACYT 33851-B), Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq: 563304/2010-3, 562955/2010-0, 574008/2008-0 and PQ 307422/2012-7), FOMIX-Yucatan (YUC-2008-C06-108863), ForestGEO, Fundação de Amparo à Pesquisa de Minas Gerais (FAPEMIG CRA APQ-00001-11), Fundación Ecológica de Cuixmala, Heising-Simons Foundation, HSBC, ICETEX, Instituto Internacional de Educação do Brasil-IEB, Instituto Nacional de Serviços Ambientais da Amazônia -Servamb-INPA, Inter-American Institute for Global Change (Tropi-Dr Network CRN3-025) via a grant from the US National Science Foundation (grant GEO-1128040), Motta Family Foundation, NASA Terrestrial Ecology Program, National Science Foundation (NSF-CNH-RCN grant 1313788 for Tropical Reforestation Network: Building a Socioecological Understanding of Tropical Reforestation (PARTNERS), NSF DEB-0129104, NSF BCS-1349952, NSF Career Grant DEB-1053237, NSF DEB 1050957, 0639393, 1147429, 0639114, and 1147434), NUFFIC, USAID (BOLFOR), Science without Borders Program (CAPES/CNPq) grant number 88881.064976/2014-01, The São Paulo Research Foundation (FAPESP) grant 2011/06782-5 and 2014/14503-7, Silicon Valley Foundation, Stichting Het Kronendak, Tropenbos Foundation, University of Connecticut Research Foundation, Wageningen University (INREF Terra Preta programme and FOREFRONT programme). This is publication number 683 in the Technical Series of the Biological Dynamics of Forest Fragments Project BDFFP-INPA-SI. This study was partly funded by the European Unionâs Seventh Framework Programme (FP7/2007-2013) under grant agreement number 283093; Role Of Biodiversity In climate change mitigatioN (ROBIN).
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L.P., F.B. and D.R. conceived the idea and coordinated the data compilations, D.R. analysed the data, L.P., F.B., E.N.B. and R.C. contributed to analytical tools used in the analysis, E.N.B. and A.M.A.Z. made the map, L.P. wrote the paper, and all co-authors collected field data, discussed the results, gave suggestions for further analyses and commented on the manuscript.
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Plot-level AGB data of 41 sites are available from the Dryad Digital Repository: http://dx.doi.org/10.5061/dryad.82vr4, and for four sites they can be requested from L.P.
Extended data figures and tables
Extended Data Figure 1 Relative recovery of AGB after 20 years in relation to abiotic factors, forest cover, and land use.
a, Annual precipitation; b, CWD; c, rainfall seasonality; d, CEC; e, percentage forest cover in the surrounding matrix; f, previous land use (SC, shifting cultivation, Nâ=â17; SC & PA, some plots shifting cultivation, some plots pasture, Nâ=â2; PA, pasture, Nâ=â9; meansâ±âs.e.m. are shown). Relative recovery is expressed as the ratio of AGB after 20 years over median AGB of old-growth forest (as a percentage). Regression lines are shown while keeping the other variable constant at the mean value across sites (Pâ=â0.040 for 1/rainfall, Pâ=â0.027 for CEC, R2â=â0.23, Nâ=â28 Neotropical forest sites).
Extended Data Figure 2 AGB recovery after 20 years in relation to abiotic factors, forest cover, and land use.
a, Rainfall seasonality; b, CEC; c, percentage forest cover in the surrounding matrix; d, previous land use (SC, Nâ=â19; SC & PA, Nâ=â9; PA, Nâ=â15; meansâ±âs.e.m. are shown). For rainfall seasonality, the regression line is shown based upon the multiple regression model that also includes rainfall and CWD, and where these variables were kept constant at the mean value across sites (two-sided Pâ=â0.003, see Fig. 2 for these models for rainfall and CWD).
Extended Data Figure 3 Uncertainty map of potential biomass recovery of Neotropical secondary forests.
The uncertainty is based on the 95% confidence interval of the mean predicted AGB after 20 years (see Fig. 3 and Methods). It is expressed as a percentage of the predicted AGB: 100âÃâ(0.5âÃâ95% confidence interval of the mean)/predicted AGB. In general the uncertainty is low: 80.32% of the mapped area has an uncertainty less than 20%, and 10.2% of the mapped area has an uncertainty between 20% and 30%. Because it is a relative uncertainty, it is highest in the driest areas, which have a low predicted biomass.
Extended Data Figure 4 Relationship between forest biomass and stand age using chronosequence studies in Neotropical secondary forest sites.
a, AGB (Nâ=â44); b, AGB recovery (Nâ=â28). The same as Fig. 1 but with plots and regression lines coloured by forest type: green, dry forest (<1,500âmm rainfall per year); light blue, moist forest (1,500â2,499âmmâyrâ1); dark blue, wet forest (â¥2,500âmmâyrâ1). Each line represents a different chronosequence. The original plots on which the regression lines are based are shown (Nâ=â1,364 for AGB, Nâ=â995 for AGB recovery). AGB recovery is defined as the AGB of the secondary forest plot compared with the median AGB of old-growth forest plots in the area, multiplied by 100. Significant relations (two-sided Pââ¤â0.05) are indicated by continuous lines, non-significant relationships (two-sided Pâ>â0.05) are indicated by broken lines. Plots of 100 years old are also second-growth.
Extended Data Figure 5 Potential biomass recovery map of Neotropical secondary forests.
The same as Fig. 3 but with colour-blind-friendly colour coding. The total potential AGB accumulation over 20 years of lowland secondary forest growth was calculated on the basis of a regression equation relating AGB with annual rainfall (AGBâ=â135.17âââ103,950âÃâ1/rainfallâ+â1.522âÃârainfall seasonalityâ+â0.1148âÃâCWD; see Methods). The colour indicates the amount of forest cover recovery (purple, low recovery; green, high recovery). The 44 study sites are indicated by circles; the size of the symbols scales with the AGB attained after 20 years. The grey areas do not belong to the tropical forest biome. The map focuses on lowland tropical forest (altitude <1,000âm).
Extended Data Figure 6 AGB of secondary forest.
a, AGB 10 years and b, 20 years after land abandonment. Predicted mean AGB is given for three different forest types (dry (<1,500âmm rainfall), moist (1,500â2,499âmm), wet (â¥2,500âmm)) using three different allometric equations (indicated by different colours). These allometric equations are ordered from left to right as ref. 34 (blue), ref. 33 (red), and ref. 32 (grey). Meansâ±âs.e.m. are shown.
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Poorter, L., Bongers, F., Aide, T. et al. Biomass resilience of Neotropical secondary forests. Nature 530, 211â214 (2016). https://doi.org/10.1038/nature16512
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DOI: https://doi.org/10.1038/nature16512
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