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1. Soil properties as key predictors of global grassland production: Have we overlooked micronutrients?

Author

Thrall, P, Radujkovic, D, Verbruggen, E, Seabloom, EW, Bahn, M, Biederman, LA, Borer, ET, Boughton, EH, Catford, JA, Campioli, M, Donohue, I, Ebeling, A, Eskelinen, A, Fay, PA, Hansart, A, Knops, JMH, MacDougall, AS, Ohlert, T, Venterink, HO, Raynaud, X, Risch, AC, Roscher, C, Schuetz, M, Silveira, ML, Stevens, CJ, Van Sundert, K, Virtanen, R, Wardle, GM, Wragg, PD, Vicca, S, Thrall, P, Radujkovic, D, Verbruggen, E, Seabloom, EW, Bahn, M, Biederman, LA, Borer, ET, Boughton, EH, Catford, JA, Campioli, M, Donohue, I, Ebeling, A, Eskelinen, A, Fay, PA, Hansart, A, Knops, JMH, MacDougall, AS, Ohlert, T, Venterink, HO, Raynaud, X, Risch, AC, Roscher, C, Schuetz, M, Silveira, ML, Stevens, CJ, Van Sundert, K, Virtanen, R, Wardle, GM, Wragg, PD, and Vicca, S

Abstract

Fertilisation experiments have demonstrated that nutrient availability is a key determinant of biomass production and carbon sequestration in grasslands. However, the influence of nutrients in explaining spatial variation in grassland biomass production has rarely been assessed. Using a global dataset comprising 72 sites on six continents, we investigated which of 16 soil factors that shape nutrient availability associate most strongly with variation in grassland aboveground biomass. Climate and N deposition were also considered. Based on theory-driven structural equation modelling, we found that soil micronutrients (particularly Zn and Fe) were important predictors of biomass and, together with soil physicochemical properties and C:N, they explained more unique variation (32%) than climate and N deposition (24%). However, the association between micronutrients and biomass was absent in grasslands limited by NP. These results highlight soil properties as key predictors of global grassland biomass production and point to serial co-limitation by NP and micronutrients.

Published
2021

2. Plant species' origin predicts dominance and response to nutrient enrichment and herbivores in global grasslands

Author

Seabloom, EW, Borer, ET, Buckley, YM, Cleland, EE, Davies, KF, Firn, J, Harpole, WS, Hautier, Y, Lind, EM, MacDougall, AS, Orrock, JL, Prober, SM, Adler, PB, Anderson, TM, Bakker, JD, Biederman, LA, Blumenthal, DM, Brown, CS, Brudvig, LA, Cadotte, M, Chu, C, Cottingham, KL, Crawley, MJ, Damschen, EI, Dantonio, CM, DeCrappeo, NM, Du, G, Fay, PA, Frater, P, Gruner, DS, Hagenah, N, Hector, A, Hillebrand, H, Hofmockel, KS, Humphries, HC, Jin, VL, Kay, A, Kirkman, KP, Klein, JA, Knops, JMH, La Pierre, KJ, Ladwig, L, Lambrinos, JG, Li, Q, Li, W, Marushia, R, McCulley, RL, Melbourne, BA, Mitchell, CE, Moore, JL, Morgan, J, Mortensen, B, O'Halloran, LR, Pyke, DA, Risch, AC, Sankaran, M, Schuetz, M, Simonsen, A, Smith, MD, Stevens, CJ, Sullivan, L, Wolkovich, E, Wragg, PD, Wright, J, Yang, L, Seabloom, EW, Borer, ET, Buckley, YM, Cleland, EE, Davies, KF, Firn, J, Harpole, WS, Hautier, Y, Lind, EM, MacDougall, AS, Orrock, JL, Prober, SM, Adler, PB, Anderson, TM, Bakker, JD, Biederman, LA, Blumenthal, DM, Brown, CS, Brudvig, LA, Cadotte, M, Chu, C, Cottingham, KL, Crawley, MJ, Damschen, EI, Dantonio, CM, DeCrappeo, NM, Du, G, Fay, PA, Frater, P, Gruner, DS, Hagenah, N, Hector, A, Hillebrand, H, Hofmockel, KS, Humphries, HC, Jin, VL, Kay, A, Kirkman, KP, Klein, JA, Knops, JMH, La Pierre, KJ, Ladwig, L, Lambrinos, JG, Li, Q, Li, W, Marushia, R, McCulley, RL, Melbourne, BA, Mitchell, CE, Moore, JL, Morgan, J, Mortensen, B, O'Halloran, LR, Pyke, DA, Risch, AC, Sankaran, M, Schuetz, M, Simonsen, A, Smith, MD, Stevens, CJ, Sullivan, L, Wolkovich, E, Wragg, PD, Wright, J, and Yang, L

Abstract

Exotic species dominate many communities; however the functional significance of species' biogeographic origin remains highly contentious. This debate is fuelled in part by the lack of globally replicated, systematic data assessing the relationship between species provenance, function and response to perturbations. We examined the abundance of native and exotic plant species at 64 grasslands in 13 countries, and at a subset of the sites we experimentally tested native and exotic species responses to two fundamental drivers of invasion, mineral nutrient supplies and vertebrate herbivory. Exotic species are six times more likely to dominate communities than native species. Furthermore, while experimental nutrient addition increases the cover and richness of exotic species, nutrients decrease native diversity and cover. Native and exotic species also differ in their response to vertebrate consumer exclusion. These results suggest that species origin has functional significance, and that eutrophication will lead to increased exotic dominance in grasslands.

Published
2015

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