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1. Global patterns and environmental drivers of forest functional composition

Author

Bouchard, E., Searle, E.B., Drapeau, P., Liang, J., Gamarra, J.G.P., Abegg, M., Alberti, G., Zambrano, A.A., Alvarez‐Davila, E., Alves, L.F., Avitabile, V., Aymard, G., Bastin, J.‐F., Birnbaum, P., Bongers, F., Bouriaud, O., Brancalion, P., Broadbent, E., Bussotti, F., Gatti, R.C., Češljar, G., Chisholm, C., Cienciala, E., Clark, C. J., Corral‐Rivas, J.J., Crowther, T.W., Dayanandan, S., Decuyper, M., de Gasper, A.L., de‐Miguel, S., Derroire, G., DeVries, B., Djordjević, I., Van Do, T., Dolezal, J., Fayle, T.M., Fridman, J., Frizzera, L., Gianelle, D., Hemp, A., Hérault, B., Herold, M., Imai, N., Jagodziński, A.M., Jaroszewicz, B., Jucker, T., Kepfer‐Rojas, S., Keppel, G., Khan, M.L., Kim, H..S., Korjus, H., Kraxner, Fl., Laarmann, D., Lewis, S., Lu, H., Maitner, B.S., Marcon, E., Marshall, A.R., Mukul, S.A., Nabuurs, G.‐J., Nava‐Miranda, M.G., Parfenova, E.I., Park, M., Peri, P.L., Pfautsch, S., Phillips, O.L., Piedade, M.T.F., Piotto, D., Poulsen, J.R., Poulsen, A.D., Pretzsch, H., Reich, P.B., Rodeghiero, M., Rolim, S., Rovero, F., Saikia, P., Salas‐Eljatib, C., Schall, P., Shchepashchenko, D., Schöngart, J., Šebeň, V., Sist, P., Slik, F., Souza, A.F., Stereńczak, K., Svoboda, M., Tchebakova, N.M., ter Steege, H., Tikhonova, E.V., Usoltsev, V.A., Valladares, F., Viana, H., Vibrans, A.C., Wang, H.‐F.., Westerlund, B., Wiser, S.K., Wittmann, F., Wortel, V., Zawiła‐Niedźwiecki, T., Zhou, M., Zhu, Z.‐X., Zo‐Bi, I.C., Paquette, A., Bouchard, E., Searle, E.B., Drapeau, P., Liang, J., Gamarra, J.G.P., Abegg, M., Alberti, G., Zambrano, A.A., Alvarez‐Davila, E., Alves, L.F., Avitabile, V., Aymard, G., Bastin, J.‐F., Birnbaum, P., Bongers, F., Bouriaud, O., Brancalion, P., Broadbent, E., Bussotti, F., Gatti, R.C., Češljar, G., Chisholm, C., Cienciala, E., Clark, C. J., Corral‐Rivas, J.J., Crowther, T.W., Dayanandan, S., Decuyper, M., de Gasper, A.L., de‐Miguel, S., Derroire, G., DeVries, B., Djordjević, I., Van Do, T., Dolezal, J., Fayle, T.M., Fridman, J., Frizzera, L., Gianelle, D., Hemp, A., Hérault, B., Herold, M., Imai, N., Jagodziński, A.M., Jaroszewicz, B., Jucker, T., Kepfer‐Rojas, S., Keppel, G., Khan, M.L., Kim, H..S., Korjus, H., Kraxner, Fl., Laarmann, D., Lewis, S., Lu, H., Maitner, B.S., Marcon, E., Marshall, A.R., Mukul, S.A., Nabuurs, G.‐J., Nava‐Miranda, M.G., Parfenova, E.I., Park, M., Peri, P.L., Pfautsch, S., Phillips, O.L., Piedade, M.T.F., Piotto, D., Poulsen, J.R., Poulsen, A.D., Pretzsch, H., Reich, P.B., Rodeghiero, M., Rolim, S., Rovero, F., Saikia, P., Salas‐Eljatib, C., Schall, P., Shchepashchenko, D., Schöngart, J., Šebeň, V., Sist, P., Slik, F., Souza, A.F., Stereńczak, K., Svoboda, M., Tchebakova, N.M., ter Steege, H., Tikhonova, E.V., Usoltsev, V.A., Valladares, F., Viana, H., Vibrans, A.C., Wang, H.‐F.., Westerlund, B., Wiser, S.K., Wittmann, F., Wortel, V., Zawiła‐Niedźwiecki, T., Zhou, M., Zhu, Z.‐X., Zo‐Bi, I.C., and Paquette, A.

Abstract

Aim To determine the relationships between the functional trait composition of forest communities and environmental gradients across scales and biomes and the role of species relative abundances in these relationships. Location Global. Time period Recent. Major taxa studied Trees. Methods We integrated species abundance records from worldwide forest inventories and associated functional traits (wood density, specific leaf area and seed mass) to obtain a data set of 99,953 to 149,285 plots (depending on the trait) spanning all forested continents. We computed community-weighted and unweighted means of trait values for each plot and related them to three broad environmental gradients and their interactions (energy availability, precipitation and soil properties) at two scales (global and biomes). Results Our models explained up to 60% of the variance in trait distribution. At global scale, the energy gradient had the strongest influence on traits. However, within-biome models revealed different relationships among biomes. Notably, the functional composition of tropical forests was more influenced by precipitation and soil properties than energy availability, whereas temperate forests showed the opposite pattern. Depending on the trait studied, response to gradients was more variable and proportionally weaker in boreal forests. Community unweighted means were better predicted than weighted means for almost all models. Main conclusions Worldwide, trees require a large amount of energy (following latitude) to produce dense wood and seeds, while leaves with large surface to weight ratios are concentrated in temperate forests. However, patterns of functional composition within-biome differ from global patterns due to biome specificities such as the presence of conifers or unique combinations of climatic and soil properties. We recommend assessing the sensitivity of tree functional traits to environmental changes in their geographic context. Furthermore, at a given site, th

Published
2024
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2. Positive feedbacks and alternative stable states in forest leaf types

Author

Zou, Y., Zohner, C., Averill, C., Ma, H., Merder, J., Berdugo, M., Bialic-Murphy, L., Mo, L., Brun, P., Zimmermann, N., Liang, J., de-Miguel, S., Nabuurs, G.-J., Reich, P., Niinements, U., Dahlgren, J., Kändler, G., Ratcliffe, S., Ruiz-Benito, P., de Zavala, M., Abegg, M., Adou Yao, Y., Alberti, G., Almeyda Zambrano, A., Alvarado, B., Alvarez-Dávila, E., Alvarez-Loayza, P., Alves, L., Ammer, C., Antón-Fernández, C., Araujo-Murakami, A., Arroyo, L., Avitabile, V., Aymard, G., Baker, T., Bałazy, R., Banki, O., Barroso, J., Bastian, M., Bastin, J.-F., Birigazzi, L., Birnbaum, P., Bitariho, R., Boeckx, P., Bongers, F., Bouriaud, O., Brancalion, P., Brandl, S., Brearley, F., Brienen, R., Broadbent, E., Bruelheide, H., Bussotti, F., Gatti, R., César, R., Cesljar, G., Chazdon, R., Chen, H., Chisholm, C., Cho, H., Cienciala, E., Clark, C., Clark, D., Colletta, G., Coomes, D., Valverde, F., Corral-Rivas, J., Crim, P., Cumming, J., Dayanandan, S., de Gasper, A., Decuyper, M., Derroire, G., DeVries, B., Djordjevic, I., Dolezal, J., Dourdain, A., Obiang, N., Enquist, B., Eyre, T., Fandohan, A., Fayle, T., Feldpausch, T., Ferreira, L., Finér, L., Fischer, M., Fletcher, C., Fridman, J., Frizzera, L., Gamarra, J., Gianelle, D., Glick, H., Harris, D., Hector, A., Hemp, A., Hengeveld, G., Hérault, B., Herbohn, J., Herold, M., Hillers, A., Honorio Coronado, E., Hui, C., Ibanez, T., Iêda, A., Imai, N., Jagodziński, A., Jaroszewicz, B., Johannsen, V., Joly, C., Jucker, T., Jung, I., Karminov, V., Kartawinata, K., Kearsley, E., Kenfack, D., Kennard, D., Kepfer-Rojas, S., Keppel, G., Khan, M., Killeen, T., Kim, H., Kitayama, K., Köhl, M., Korjus, H., Kraxner, F., Laarmann, D., Lang, M., Lewis, S., Lu, H., Lukina, N., Maitner, B., Malhi, Y., Marcon, E., Marimon, B., Marimon-Junior, B., Marshall, A., Martin, E., Kucher, D., Meave, J., Melo-Cruz, O., Mendoza, C., Merow, C., Mendoza, A., Moreno, V., Mukul, S., Mundhenk, P., Nava-Miranda, M., Neill, D., Neldner, V., Nevenic, R., Ngugi, M., Niklaus, P., Oleksyn, J., Ontikov, P., Ortiz-Malavasi, E., Pan, Y., Paquette, A., Parada-Gutierrez, A., Parfenova, E., Park, M., Parren, M., Parthasarathy, N., Peri, P., Pfautsch, S., Phillips, O., Picard, N., Piedade, M., Piotto, D., Pitman, N., Polo, I., Poorter, L., Poulsen, A., Poulsen, J., Pretzsch, H., Arevalo, F., Restrepo-Correa, Z., Rodeghiero, M., Rolim, S., Roopsind, A., Rovero, F., Rutishauser, E., Saikia, P., Salas-Eljatib, C., Saner, P., Schall, P., Schelhaas, M., Shchepashchenko, D., Scherer-Lorenzen, M., Schmid, B., Schöngart, J., Searle, E., Seben, V., Serra-Diaz, J., Sheil, D., Shvidenko, A., Silva-Espejo, J., Silveira, M., Singh, J., Sist, P., Slik, F., Sonké, B., Souza, A., Miscicki, S., Stereńczak, K., Svenning, J., Svoboda, M., Swanepoel, B., Targhetta, N., Tchebakova, N., ter Steege, H., Thomas, R., Tikhonova, E., Umunay, P., Usoltsev, V., Valencia, R., Valladares, F., van der Plas, F., Van Do, T., van Nuland, M., Vasquez, R., Verbeeck, H., Viana, H., Vibrans, A., Vieira, S., von Gadow, K., Wang, H., Watson, J., Werner, G., Westerlund, B., Wiser, S., Wittmann, F., Woell, H., Wortel, V., Zagt, R., Zawiła-Niedźwiecki, T., Zhang, C., Zhao, X., Zhou, M., Zhu, Z., Zo-Bi, I., Crowther, T., Zou, Y., Zohner, C., Averill, C., Ma, H., Merder, J., Berdugo, M., Bialic-Murphy, L., Mo, L., Brun, P., Zimmermann, N., Liang, J., de-Miguel, S., Nabuurs, G.-J., Reich, P., Niinements, U., Dahlgren, J., Kändler, G., Ratcliffe, S., Ruiz-Benito, P., de Zavala, M., Abegg, M., Adou Yao, Y., Alberti, G., Almeyda Zambrano, A., Alvarado, B., Alvarez-Dávila, E., Alvarez-Loayza, P., Alves, L., Ammer, C., Antón-Fernández, C., Araujo-Murakami, A., Arroyo, L., Avitabile, V., Aymard, G., Baker, T., Bałazy, R., Banki, O., Barroso, J., Bastian, M., Bastin, J.-F., Birigazzi, L., Birnbaum, P., Bitariho, R., Boeckx, P., Bongers, F., Bouriaud, O., Brancalion, P., Brandl, S., Brearley, F., Brienen, R., Broadbent, E., Bruelheide, H., Bussotti, F., Gatti, R., César, R., Cesljar, G., Chazdon, R., Chen, H., Chisholm, C., Cho, H., Cienciala, E., Clark, C., Clark, D., Colletta, G., Coomes, D., Valverde, F., Corral-Rivas, J., Crim, P., Cumming, J., Dayanandan, S., de Gasper, A., Decuyper, M., Derroire, G., DeVries, B., Djordjevic, I., Dolezal, J., Dourdain, A., Obiang, N., Enquist, B., Eyre, T., Fandohan, A., Fayle, T., Feldpausch, T., Ferreira, L., Finér, L., Fischer, M., Fletcher, C., Fridman, J., Frizzera, L., Gamarra, J., Gianelle, D., Glick, H., Harris, D., Hector, A., Hemp, A., Hengeveld, G., Hérault, B., Herbohn, J., Herold, M., Hillers, A., Honorio Coronado, E., Hui, C., Ibanez, T., Iêda, A., Imai, N., Jagodziński, A., Jaroszewicz, B., Johannsen, V., Joly, C., Jucker, T., Jung, I., Karminov, V., Kartawinata, K., Kearsley, E., Kenfack, D., Kennard, D., Kepfer-Rojas, S., Keppel, G., Khan, M., Killeen, T., Kim, H., Kitayama, K., Köhl, M., Korjus, H., Kraxner, F., Laarmann, D., Lang, M., Lewis, S., Lu, H., Lukina, N., Maitner, B., Malhi, Y., Marcon, E., Marimon, B., Marimon-Junior, B., Marshall, A., Martin, E., Kucher, D., Meave, J., Melo-Cruz, O., Mendoza, C., Merow, C., Mendoza, A., Moreno, V., Mukul, S., Mundhenk, P., Nava-Miranda, M., Neill, D., Neldner, V., Nevenic, R., Ngugi, M., Niklaus, P., Oleksyn, J., Ontikov, P., Ortiz-Malavasi, E., Pan, Y., Paquette, A., Parada-Gutierrez, A., Parfenova, E., Park, M., Parren, M., Parthasarathy, N., Peri, P., Pfautsch, S., Phillips, O., Picard, N., Piedade, M., Piotto, D., Pitman, N., Polo, I., Poorter, L., Poulsen, A., Poulsen, J., Pretzsch, H., Arevalo, F., Restrepo-Correa, Z., Rodeghiero, M., Rolim, S., Roopsind, A., Rovero, F., Rutishauser, E., Saikia, P., Salas-Eljatib, C., Saner, P., Schall, P., Schelhaas, M., Shchepashchenko, D., Scherer-Lorenzen, M., Schmid, B., Schöngart, J., Searle, E., Seben, V., Serra-Diaz, J., Sheil, D., Shvidenko, A., Silva-Espejo, J., Silveira, M., Singh, J., Sist, P., Slik, F., Sonké, B., Souza, A., Miscicki, S., Stereńczak, K., Svenning, J., Svoboda, M., Swanepoel, B., Targhetta, N., Tchebakova, N., ter Steege, H., Thomas, R., Tikhonova, E., Umunay, P., Usoltsev, V., Valencia, R., Valladares, F., van der Plas, F., Van Do, T., van Nuland, M., Vasquez, R., Verbeeck, H., Viana, H., Vibrans, A., Vieira, S., von Gadow, K., Wang, H., Watson, J., Werner, G., Westerlund, B., Wiser, S., Wittmann, F., Woell, H., Wortel, V., Zagt, R., Zawiła-Niedźwiecki, T., Zhang, C., Zhao, X., Zhou, M., Zhu, Z., Zo-Bi, I., and Crowther, T.

Abstract

The emergence of alternative stable states in forest systems has significant implications for the functioning and structure of the terrestrial biosphere, yet empirical evidence remains scarce. Here, we combine global forest biodiversity observations and simulations to test for alternative stable states in the presence of evergreen and deciduous forest types. We reveal a bimodal distribution of forest leaf types across temperate regions of the Northern Hemisphere that cannot be explained by the environment alone, suggesting signatures of alternative forest states. Moreover, we empirically demonstrate the existence of positive feedbacks in tree growth, recruitment and mortality, with trees having 4–43% higher growth rates, 14–17% higher survival rates and 4–7 times higher recruitment rates when they are surrounded by trees of their own leaf type. Simulations show that the observed positive feedbacks are necessary and sufficient to generate alternative forest states, which also lead to dependency on history (hysteresis) during ecosystem transition from evergreen to deciduous forests and vice versa. We identify hotspots of bistable forest types in evergreen-deciduous ecotones, which are likely driven by soil-related positive feedbacks. These findings are integral to predicting the distribution of forest biomes, and aid to our understanding of biodiversity, carbon turnover, and terrestrial climate feedbacks.

Published
2024
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3. Reading tea leaves worldwide: Decoupled drivers of initial litter decomposition mass‐loss rate and stabilization

Author

Sarneel, J., Hefting, M., Sandén, T., van den Hoogen, J., Routh, D., Adhikari, B., Alatalo, J., Aleksanyan, A., Althuizen, I., Alsafran, M., Atkins, J., Augusto, L., Aurela, M., Azarov, A., Barrio, I., Beier, C., Bejarano, M., Benham, S., Berg, B., Bezler, N., Björnsdóttir, K., Bolinder, M., Carbognani, M., Cazzolla Gatti, R., Chelli, S., Chistotin, M., Christiansen, C., Courtois, P., Crowther, T., Dechoum, M., Djukic, I., Duddigan, S., Egerton‐Warburton, L., Fanin, N., Fantappiè, M., Fares, S., Fernandes, G., Filippova, N., Fliessbach, A., Fuentes, D., Godoy, R., Grünwald, T., Guzmán, G., Hawes, J., He, Y., Hero, J.‐M., Hess, L., Hogendoorn, K., Høye, T., Jans, W., Jónsdóttir, I., Keller, S., Kepfer‐Rojas, S., Kuz'menko, N., Larsen, K., Laudon, H., Lembrechts, J., Li, J., Limousin, J.‐M., Lukin, S., Marques, R., Marín, C., McDaniel, M., Meek, Q., Merzlaya, G., Michelsen, A., Montagnani, L., Mueller, P., Murugan, R., Myers‐Smith, I., Nolte, S., Ochoa‐Hueso, R., Okafor, B., Okorkov, V., Onipchenko, V., Orozco, M., Parkhurst, T., Peres, C., Petit Bon, M., Petraglia, A., Pingel, M., Rebmann, C., Scheffers, B., Schmidt, I., Scholes, M., Sheffer, E., Shevtsova, L., Smith, S., Sofo, A., Stevenson, P., Strouhalová, B., Sundsdal, A., Sühs, R., Tamene, G., Thomas, H., Tolunay, D., Tomaselli, M., Tresch, S., Tucker, D., Ulyshen, M., Valdecantos, A., Vandvik, V., Vanguelova, E., Verheyen, K., Wang, X., Yahdjian, L., Yumashev, X., Keuskamp, J., Sarneel, J., Hefting, M., Sandén, T., van den Hoogen, J., Routh, D., Adhikari, B., Alatalo, J., Aleksanyan, A., Althuizen, I., Alsafran, M., Atkins, J., Augusto, L., Aurela, M., Azarov, A., Barrio, I., Beier, C., Bejarano, M., Benham, S., Berg, B., Bezler, N., Björnsdóttir, K., Bolinder, M., Carbognani, M., Cazzolla Gatti, R., Chelli, S., Chistotin, M., Christiansen, C., Courtois, P., Crowther, T., Dechoum, M., Djukic, I., Duddigan, S., Egerton‐Warburton, L., Fanin, N., Fantappiè, M., Fares, S., Fernandes, G., Filippova, N., Fliessbach, A., Fuentes, D., Godoy, R., Grünwald, T., Guzmán, G., Hawes, J., He, Y., Hero, J.‐M., Hess, L., Hogendoorn, K., Høye, T., Jans, W., Jónsdóttir, I., Keller, S., Kepfer‐Rojas, S., Kuz'menko, N., Larsen, K., Laudon, H., Lembrechts, J., Li, J., Limousin, J.‐M., Lukin, S., Marques, R., Marín, C., McDaniel, M., Meek, Q., Merzlaya, G., Michelsen, A., Montagnani, L., Mueller, P., Murugan, R., Myers‐Smith, I., Nolte, S., Ochoa‐Hueso, R., Okafor, B., Okorkov, V., Onipchenko, V., Orozco, M., Parkhurst, T., Peres, C., Petit Bon, M., Petraglia, A., Pingel, M., Rebmann, C., Scheffers, B., Schmidt, I., Scholes, M., Sheffer, E., Shevtsova, L., Smith, S., Sofo, A., Stevenson, P., Strouhalová, B., Sundsdal, A., Sühs, R., Tamene, G., Thomas, H., Tolunay, D., Tomaselli, M., Tresch, S., Tucker, D., Ulyshen, M., Valdecantos, A., Vandvik, V., Vanguelova, E., Verheyen, K., Wang, X., Yahdjian, L., Yumashev, X., and Keuskamp, J.

Abstract

The breakdown of plant material fuels soil functioning and biodiversity. Currently, process understanding of global decomposition patterns and the drivers of such patterns are hampered by the lack of coherent large-scale datasets. We buried 36,000 individual litterbags (tea bags) worldwide and found an overall negative correlation between initial mass-loss rates and stabilization factors of plant-derived carbon, using the Tea Bag Index (TBI). The stabilization factor quantifies the degree to which easy-to-degrade components accumulate during early-stage decomposition (e.g. by environmental limitations). However, agriculture and an interaction between moisture and temperature led to a decoupling between initial mass-loss rates and stabilization, notably in colder locations. Using TBI improved mass-loss estimates of natural litter compared to models that ignored stabilization. Ignoring the transformation of dead plant material to more recalcitrant substances during early-stage decomposition, and the environmental control of this transformation, could overestimate carbon losses during early decomposition in carbon cycle models.

Published
2024
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4. The global distribution and drivers of wood density and their impact on forest carbon stocks.

Author

Mo L, Crowther TW, Maynard DS, van den Hoogen J, Ma H, Bialic-Murphy L, Liang J, de-Miguel S, Nabuurs GJ, Reich PB, Phillips OL, Abegg M, Adou Yao YC, Alberti G, Almeyda Zambrano AM, Alvarado BV, Alvarez-Dávila E, Alvarez-Loayza P, Alves LF, Amaral I, Ammer C, Antón-Fernández C, Araujo-Murakami A, Arroyo L, Avitabile V, Aymard GA, Baker TR, Bałazy R, Banki O, Barroso JG, Bastian ML, Bastin JF, Birigazzi L, Birnbaum P, Bitariho R, Boeckx P, Bongers F, Boonman CCF, Bouriaud O, Brancalion PHS, Brandl S, Brearley FQ, Brienen R, Broadbent EN, Bruelheide H, Bussotti F, Gatti RC, César RG, Cesljar G, Chazdon R, Chen HYH, Chisholm C, Cho H, Cienciala E, Clark C, Clark D, Colletta GD, Coomes DA, Valverde FC, Corral-Rivas JJ, Crim PM, Cumming JR, Dayanandan S, de Gasper AL, Decuyper M, Derroire G, DeVries B, Djordjevic I, Dolezal J, Dourdain A, Engone Obiang NL, Enquist BJ, Eyre TJ, Fandohan AB, Fayle TM, Feldpausch TR, Ferreira LV, Finér L, Fischer M, Fletcher C, Frizzera L, Gamarra JGP, Gianelle D, Glick HB, Harris DJ, Hector A, Hemp A, Hengeveld G, Hérault B, Herbohn JL, Herold M, Hietz P, Hillers A, Honorio Coronado EN, Hui C, Ibanez T, Imai N, Jagodziński AM, Jaroszewicz B, Johannsen VK, Joly CA, Jucker T, Jung I, Karminov V, Kartawinata K, Kearsley E, Kenfack D, Kennard DK, Kepfer-Rojas S, Keppel G, Khan ML, Killeen TJ, Kim HS, Kitayama K, Köhl M, Korjus H, Kraxner F, Kucher D, Laarmann D, Lang M, Lewis SL, Li Y, Lopez-Gonzalez G, Lu H, Lukina NV, Maitner BS, Malhi Y, Marcon E, Marimon BS, Marimon-Junior BH, Marshall AR, Martin EH, McCarthy JK, Meave JA, Melo-Cruz O, Mendoza C, Mendoza-Polo I, Miscicki S, Merow C, Mendoza AM, Moreno VS, Mukul SA, Mundhenk P, Nava-Miranda MG, Neill D, Neldner VJ, Nevenic RV, Ngugi MR, Niklaus PA, Ontikov P, Ortiz-Malavasi E, Pan Y, Paquette A, Parada-Gutierrez A, Parfenova EI, Park M, Parren M, Parthasarathy N, Peri PL, Pfautsch S, Picard N, Piedade MTF, Piotto D, Pitman NCA, Poorter L, Poulsen AD, Poulsen JR, Pretzsch H, Arevalo FR, Restrepo-Correa Z, Richardson SJ, Rodeghiero M, Rolim SG, Roopsind A, Rovero F, Rutishauser E, Saikia P, Salas-Eljatib C, Saner P, Schall P, Schelhaas MJ, Schepaschenko D, Scherer-Lorenzen M, Schmid B, Schöngart J, Searle EB, Seben V, Serra-Diaz JM, Sheil D, Shvidenko AZ, Da Silva AC, Silva-Espejo JE, Silveira M, Singh J, Sist P, Slik F, Sonké B, Sosinski EE Jr, Souza AF, Stereńczak KJ, Svenning JC, Svoboda M, Swanepoel B, Targhetta N, Tchebakova N, Ter Steege H, Thomas R, Tikhonova E, Umunay PM, Usoltsev VA, Valencia R, Valladares F, Van Bodegom PM, van der Plas F, Van Do T, van Nuland ME, Vasquez RM, Verbeeck H, Viana H, Vibrans AC, Vieira S, von Gadow K, Wang HF, Watson JV, Werner GDA, Wittmann F, Woell H, Wortel V, Zagt R, Zawiła-Niedźwiecki T, Zhang C, Zhao X, Zhou M, Zhu ZX, Zo-Bi IC, and Zohner CM

Abstract

The density of wood is a key indicator of the carbon investment strategies of trees, impacting productivity and carbon storage. Despite its importance, the global variation in wood density and its environmental controls remain poorly understood, preventing accurate predictions of global forest carbon stocks. Here we analyse information from 1.1 million forest inventory plots alongside wood density data from 10,703 tree species to create a spatially explicit understanding of the global wood density distribution and its drivers. Our findings reveal a pronounced latitudinal gradient, with wood in tropical forests being up to 30% denser than that in boreal forests. In both angiosperms and gymnosperms, hydrothermal conditions represented by annual mean temperature and soil moisture emerged as the primary factors influencing the variation in wood density globally. This indicates similar environmental filters and evolutionary adaptations among distinct plant groups, underscoring the essential role of abiotic factors in determining wood density in forest ecosystems. Additionally, our study highlights the prominent role of disturbance, such as human modification and fire risk, in influencing wood density at more local scales. Factoring in the spatial variation of wood density notably changes the estimates of forest carbon stocks, leading to differences of up to 21% within biomes. Therefore, our research contributes to a deeper understanding of terrestrial biomass distribution and how environmental changes and disturbances impact forest ecosystems., (© 2024. The Author(s).)

Published
2024
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5. Reading tea leaves worldwide: Decoupled drivers of initial litter decomposition mass-loss rate and stabilization.

Author

Sarneel JM, Hefting MM, Sandén T, van den Hoogen J, Routh D, Adhikari BS, Alatalo JM, Aleksanyan A, Althuizen IHJ, Alsafran MHSA, Atkins JW, Augusto L, Aurela M, Azarov AV, Barrio IC, Beier C, Bejarano MD, Benham SE, Berg B, Bezler NV, Björnsdóttir K, Bolinder MA, Carbognani M, Cazzolla Gatti R, Chelli S, Chistotin MV, Christiansen CT, Courtois P, Crowther TW, Dechoum MS, Djukic I, Duddigan S, Egerton-Warburton LM, Fanin N, Fantappiè M, Fares S, Fernandes GW, Filippova NV, Fliessbach A, Fuentes D, Godoy R, Grünwald T, Guzmán G, Hawes JE, He Y, Hero JM, Hess LL, Hogendoorn K, Høye TT, Jans WWP, Jónsdóttir IS, Keller S, Kepfer-Rojas S, Kuz'menko NN, Larsen KS, Laudon H, Lembrechts JJ, Li J, Limousin JM, Lukin SM, Marques R, Marín C, McDaniel MD, Meek Q, Merzlaya GE, Michelsen A, Montagnani L, Mueller P, Murugan R, Myers-Smith IH, Nolte S, Ochoa-Hueso R, Okafor BN, Okorkov VV, Onipchenko VG, Orozco MC, Parkhurst T, Peres CA, Petit Bon M, Petraglia A, Pingel M, Rebmann C, Scheffers BR, Schmidt I, Scholes MC, Sheffer E, Shevtsova LK, Smith SW, Sofo A, Stevenson PR, Strouhalová B, Sundsdal A, Sühs RB, Tamene G, Thomas HJD, Tolunay D, Tomaselli M, Tresch S, Tucker DL, Ulyshen MD, Valdecantos A, Vandvik V, Vanguelova EI, Verheyen K, Wang X, Yahdjian L, Yumashev XS, and Keuskamp JA

Subjects
Carbon Cycle, Carbon metabolism, Plant Leaves
Abstract

The breakdown of plant material fuels soil functioning and biodiversity. Currently, process understanding of global decomposition patterns and the drivers of such patterns are hampered by the lack of coherent large-scale datasets. We buried 36,000 individual litterbags (tea bags) worldwide and found an overall negative correlation between initial mass-loss rates and stabilization factors of plant-derived carbon, using the Tea Bag Index (TBI). The stabilization factor quantifies the degree to which easy-to-degrade components accumulate during early-stage decomposition (e.g. by environmental limitations). However, agriculture and an interaction between moisture and temperature led to a decoupling between initial mass-loss rates and stabilization, notably in colder locations. Using TBI improved mass-loss estimates of natural litter compared to models that ignored stabilization. Ignoring the transformation of dead plant material to more recalcitrant substances during early-stage decomposition, and the environmental control of this transformation, could overestimate carbon losses during early decomposition in carbon cycle models., (© 2024 The Authors. Ecology Letters published by John Wiley & Sons Ltd.)

Published
2024
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6. Meta-analysis contrasting freshwater biodiversity in forests and oil palm plantations with and without riparian buffers.

Author

Rojas-Castillo OA, Kepfer Rojas S, Juen L, Montag LFA, Carvalho FG, Mendes TP, Chua KWJ, Wilkinson CL, Amal MNA, Fahmi-Ahmad M, and Jacobsen D

Subjects
Animals, Forests, Agriculture, Fresh Water, Conservation of Natural Resources methods, Biodiversity
Abstract

The expansion of oil palm plantations has led to land-use change and deforestation in the tropics, which has affected biodiversity. Although the impacts of the crop on terrestrial biodiversity have been extensively reviewed, its effects on freshwater biodiversity remain relatively unexplored. We reviewed the research assessing the impacts of forest-to-oil palm conversion on freshwater biota and the mitigating effect of riparian buffers on these impacts. We searched for studies comparing taxa richness, species abundance, and community composition of macroinvertebrates, amphibians, and fish in streams in forests (primary and disturbed) and oil palm plantations with and without riparian buffers. Then, we conducted a meta-analysis to quantify the overall effect of the land-use change on the 3 taxonomic groups. Twenty-nine studies fulfilled the inclusion criteria. On average, plantations lacking buffers hosted 44% and 19% fewer stream taxa than primary and disturbed forests, respectively. Stream taxa on plantations with buffers were 24% lower than in primary forest and did not differ significantly from disturbed forest. In contrast, stream community composition differed between forests and plantations regardless of the presence of riparian buffers. These differences were attributed to agrochemical use and altered environmental conditions in the plantations, including temperature changes, worsened water conditions, microhabitat loss, and food and shelter depletion. On aggregate, abundance did not differ significantly among land uses because increases in generalist species offset the population decline of vulnerable forest specialists in the plantation. Our results reveal significant impacts of forest-to-oil palm conversion on freshwater biota, particularly taxa richness and composition (but not aggregate abundance). Although preserving riparian buffers in the plantations can mitigate the loss of various aquatic species, it cannot conserve primary forest communities. Therefore, safeguarding primary forests from the oil palm expansion is crucial, and further research is needed to address riparian buffers as a promising mitigation strategy in agricultural areas., (© 2023 The Authors. Conservation Biology published by Wiley Periodicals LLC on behalf of Society for Conservation Biology.)

Published
2024
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