8 documents found, page 1 of 1
Basin-wide variations in Amazon forest structure and function are mediated by b...
Quesada, Carlos Alberto; Phillips, Oliver L.; Schwarz, Michael; Czimczik, Claudia I.; Baker, Timothy R.; Patiño, Sandra; Fyllas, Nikolaos M.Forest structure and dynamics vary across the Amazon Basin in an east-west gradient coincident with variations in soil fertility and geology. This has resulted in the hypothesis that soil fertility may play an important role in explaining Basin-wide variations in forest biomass, growth and stem turnover rates. Soil samples were collected in a total of 59 different forest plots across the Amazon Basin and analys...
Structural, physiognomic and above-ground biomass variation in savanna-forest t...
Veenendaal, Elmar M.; Torello-Raventos, Mireia; Feldpausch, Ted R.; null, Tomas; Gerard, France F.; Schrodt, Franziska; Saiz, GustavoThrough interpretations of remote-sensing data and/or theoretical propositions, the idea that forest and savanna represent "alternative stable states" is gaining increasing acceptance. Filling an observational gap, we present detailed stratified floristic and structural analyses for forest and savanna stands located mostly within zones of transition (where both vegetation types occur in close proximity) in Afri...
Drought-mortality relationships for tropical forests
Phillips, Oliver L.; Van Der Heijden, Geertje M.F.; Lewis, Simon L.; Lopez-Gonzalez, Gabriela; Aragao, L. E.O.C.; Lloyd, Jon; Malhi, Yadvinder SinghThe rich ecology of tropical forests is intimately tied to their moisture status. Multi-site syntheses can provide a macro-scale view of these linkages and their susceptibility to changing climates. Here, we report pan-tropical and regional-scale analyses of tree vulnerability to drought. We assembled available data on tropical forest tree stem mortality before, during, and after recent drought events, from 119...
Tree height integrated into pantropical forest biomass estimates
Feldpausch, Ted R.; Lloyd, Jon; Lewis, Simon L.; Brienen, Roel J.W.; Gloor, Manuel E.; Monteagudo-Mendoza, Abel; Lopez-Gonzalez, GabrielaAboveground tropical tree biomass and carbon storage estimates commonly ignore tree height (H). We estimate the effect of incorporating H on tropics-wide forest biomass estimates in 327 plots across four continents using 42 656 H and diameter measurements and harvested trees from 20 sites to answer the following questions: ; 1. What is the best H-model form and geographic unit to include in biomass models to mi...
Basin-wide variations in foliar properties of Amazonian forest: Phylogeny, soil...
Fyllas, Nikolaos M.; Patiño, Sandra; Baker, Timothy R.; Nardoto, G. B.; Martinelli, Luiz Antônio; Quesada, Carlos Alberto; Paiva, Romilda Q.We analysed 1040 individual trees, located in 62 plots across the Amazon Basin for leaf mass per unit area (MA), foliar carbon isotopic composition (δ13C) and leaf level concentrations of C, N, P, Ca, Mg, K and Al. All trees were identified to the species level with the dataset containing 58 families, 236 genera and 508 species, distributed across a wide range of soil types and precipitation regimes. Some folia...
Foliar trait contrasts between African forest and savanna trees: Genetic versus...
Schrodt, Franziska; null, Tomas; Feldpausch, Ted R.; Saiz, Gustavo; Quesada, Carlos Alberto; Schwarz, Michael; Ishida, Francoise Yoko; Compaoré, HalidouVariations in leaf mass per unit area (Ma) and foliar concentrations of N, P, C, K, Mg and Ca were determined for 365 trees growing in 23 plots along a West African precipitation gradient ranging from 0.29 to 1.62m a-1. Contrary to previous studies, no marked increase in Ma with declining precipitation was observed, but savanna tree foliar [N] tended to be higher at the drier sites (mass basis). Generally, Ma w...
Edaphic, structural and physiological contrasts across Amazon Basin forest-sava...
Lloyd, Jon; null, Tomas; Schrodt, Franziska; Ishida, Francoise Yoko; Feldpausch, Ted R.; Saiz, Gustavo; Quesada, Carlos Alberto; Schwarz, MichaelSampling along a precipitation gradient in tropical South America extending from ca. 0.8 to 2.0 m ag-1, savanna soils had consistently lower exchangeable cation concentrations and higher C/N ratios than nearby forest plots. These soil differences were also reflected in canopy averaged leaf traits with savanna trees typically having higher leaf mass per unit area but lower mass-based nitrogen (Nm) and potassium ...
The influence of C3 and C4 vegetation on soil organic matter dynamics in contra...
Saiz, Gustavo; Bird, Michael I.; Wurster, Christopher M.; Quesada, Carlos Alberto; Ascough, Philippa L.; null, Tomas; Schrodt, FranziskaVariations in the carbon isotopic composition of soil organic matter (SOM) in bulk and fractionated samples were used to assess the influence of C3 and C4 vegetation on SOM dynamics in semi-natural tropical ecosystems sampled along a precipitation gradient in West Africa. Differential patterns in SOM dynamics in C3/C4 mixed ecosystems occurred at various spatial scales. Relative changes in C / N ratios between ...