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  1. AU="Quesada, Carlos Alberto"
  2. AU="Narges Rasouli"
  3. AU=McCaughan Dorothy
  4. AU="Hasnaoui, Nawal"
  5. AU="Yu, Bingwei"
  6. AU="Alisarli, Mustafa"
  7. AU="Kaufman, Dan"
  8. AU=Weigelin Bettina
  9. AU="Arun Kumar S"
  10. AU="Dahlsjö, Cecilia A L"
  11. AU="Gavigan, Patrick"
  12. AU="Liu, Ye"
  13. AU="Changyang Xing"
  14. AU="Sarovich, Derek S"
  15. AU="Joseph P. Zackular"
  16. AU="Maes, Evelyn"
  17. AU="Haixiang Zhou"
  18. AU="Choi, Jinyong"
  19. AU="González-Mansilla, Ana"
  20. AU="Cho Kilwon"
  21. AU="Rachide Onadja, Palamanga Abdoul"
  22. AU="Bertacca, Sofia"
  23. AU="Bansal, Ayush"
  24. AU="Liao, Naikai"
  25. AU="Gomes, Lux Attiê Santos"
  26. AU="İdil Su Canıtez"
  27. AU="Baptiste Duceau"
  28. AU="Pedro Seoane-Zonjic"
  29. AU="Guthridge, Carla J"
  30. AU=Meena Netra P.
  31. AU="Boustany, Tara"

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  1. Artikel ; Online: Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest

    Schaap, Karst J. / Fuchslueger, Lucia / Quesada, Carlos Alberto / Hofhansl, Florian / Valverde-Barrantes, Oscar / Camargo, Plínio B. / Hoosbeek, Marcel R.

    Biogeochemistry. 2023 Mar., v. 163, no. 1 p.1-15

    2023  

    Abstract: Extracellular enzymes (EE) play a vital role in soil nutrient cycling and thus affect terrestrial ecosystem functioning. Yet the drivers that regulate microbial activity, and therefore EE activity, remain under debate. In this study we investigate the ... ...

    Abstract Extracellular enzymes (EE) play a vital role in soil nutrient cycling and thus affect terrestrial ecosystem functioning. Yet the drivers that regulate microbial activity, and therefore EE activity, remain under debate. In this study we investigate the temporal variation of soil EE in a tropical terra-firme forest. We found that EE activity peaked during the drier season in association with increased leaf litterfall, which was also reflected in negative relationships between EE activities and precipitation. Soil nutrients were weakly related to EE activities, although extractable N was related to EE activities in the top 5 cm of the soil. These results suggest that soil EE activity is synchronized with precipitation-driven substrate inputs and depends on the availability of N. Our results further indicate high investments in P acquisition, with a higher microbial N demand in the month before the onset of the drier season, shifting to higher P demand towards the end of the drier season. These seasonal fluctuations in the potential acquisition of essential resources imply dynamic shifts in microbial activity in coordination with climate seasonality and resource limitation of central-eastern Amazon forests.
    Schlagwörter biogeochemistry ; climate ; extracellular enzymes ; forests ; leaves ; microbial activity ; plant litter ; soil nutrients ; temporal variation ; terrestrial ecosystems
    Sprache Englisch
    Erscheinungsverlauf 2023-03
    Umfang p. 1-15.
    Erscheinungsort Springer International Publishing
    Dokumenttyp Artikel ; Online
    ZDB-ID 1478541-9
    ISSN 1573-515X ; 0168-2563
    ISSN (online) 1573-515X
    ISSN 0168-2563
    DOI 10.1007/s10533-022-01009-4
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  2. Artikel: Wood Nutrient-Water-Density Linkages Are Influenced by Both Species and Environment.

    Lira-Martins, Demetrius / Quesada, Carlos Alberto / Strekopytov, Stanislav / Humphreys-Williams, Emma / Herault, Bruno / Lloyd, Jon

    Frontiers in plant science

    2022  Band 13, Seite(n) 778403

    Abstract: Tropical trees store a large amount of nutrients in their woody tissues, thus triggering the question of what the functional association of these elements with other wood traits is. Given the osmotic activity of mineral elements such as potassium, sodium, ...

    Abstract Tropical trees store a large amount of nutrients in their woody tissues, thus triggering the question of what the functional association of these elements with other wood traits is. Given the osmotic activity of mineral elements such as potassium, sodium, and calcium, these elements should be strong candidates in mediating the water storing capacity in tropical trees. We investigated the role of wood nutrients in facilitating wood water storage in trees by using branch samples from 48 tropical tree species in South America and examined their associations with wood density (ρ). Wood density varied from 316 kg/m
    Sprache Englisch
    Erscheinungsdatum 2022-04-04
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2022.778403
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  3. Artikel ; Online: Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest

    Schaap, Karst J. / Fuchslueger, Lucia / Quesada, Carlos Alberto / Hofhansl, Florian / Valverde-Barrantes, Oscar / Camargo, Plínio B. / Hoosbeek, Marcel R.

    Biogeochemistry

    2023  Band 163, Heft 1

    Abstract: Extracellular enzymes (EE) play a vital role in soil nutrient cycling and thus affect terrestrial ecosystem functioning. Yet the drivers that regulate microbial activity, and therefore EE activity, remain under debate. In this study we investigate the ... ...

    Abstract Extracellular enzymes (EE) play a vital role in soil nutrient cycling and thus affect terrestrial ecosystem functioning. Yet the drivers that regulate microbial activity, and therefore EE activity, remain under debate. In this study we investigate the temporal variation of soil EE in a tropical terra-firme forest. We found that EE activity peaked during the drier season in association with increased leaf litterfall, which was also reflected in negative relationships between EE activities and precipitation. Soil nutrients were weakly related to EE activities, although extractable N was related to EE activities in the top 5 cm of the soil. These results suggest that soil EE activity is synchronized with precipitation-driven substrate inputs and depends on the availability of N. Our results further indicate high investments in P acquisition, with a higher microbial N demand in the month before the onset of the drier season, shifting to higher P demand towards the end of the drier season. These seasonal fluctuations in the potential acquisition of essential resources imply dynamic shifts in microbial activity in coordination with climate seasonality and resource limitation of central-eastern Amazon forests.
    Schlagwörter Enzyme activity vectors ; Extracellular enzymes ; Leaf litter ; Nutrient stoichiometry ; Soil nutrients ; Tropical forest soil
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Erscheinungsland nl
    Dokumenttyp Artikel ; Online
    ZDB-ID 1478541-9
    ISSN 1573-515X ; 0168-2563
    ISSN (online) 1573-515X
    ISSN 0168-2563
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Buch ; Online: Reference maps of soil phosphorus for the pan-Amazon region

    Darela-Filho, João Paulo / Rammig, Anja / Fleischer, Katrin / Reichert, Tatiana / Lugli, Laynara Figueiredo / Quesada, Carlos Alberto / Hurtarte, Luis Carlos Colocho / Paula, Mateus Dantas / Lapola, David M.

    eISSN: 1866-3516

    2024  

    Abstract: Phosphorus (P) is recognized as an important driver of terrestrial primary productivity across biomes. Several recent developments in process-based vegetation models aim at the concomitant representation of the carbon (C), nitrogen (N), and P cycles in ... ...

    Abstract Phosphorus (P) is recognized as an important driver of terrestrial primary productivity across biomes. Several recent developments in process-based vegetation models aim at the concomitant representation of the carbon (C), nitrogen (N), and P cycles in terrestrial ecosystems, building upon the ecological stoichiometry and the processes that govern nutrient availability in soils. Thus, understanding the spatial distribution of P forms in soil is fundamental to initializing and/or evaluating process-based models that include the biogeochemical cycle of P. One of the major constraints for the large-scale application of these models is the lack of data related to the spatial patterns of the various forms of P present in soils, given the sparse nature of in situ observations. We applied a model selection approach based on random forest regression models trained and tested for the prediction of different P forms (total, available, organic, inorganic, and occluded P) – obtained by the Hedley sequential extraction method. As input for the models, reference soil group and textural properties, geolocation, N and C contents, terrain elevation and slope, soil pH, and mean annual precipitation and temperature from 108 sites of the RAINFOR network were used. The selected models were then applied to predict the target P forms using several spatially explicit datasets containing contiguous estimated values across the area of interest. Here, we present a set of maps depicting the distribution of total, available, organic, inorganic, and occluded P forms in the topsoil profile (0–30 cm) of the pan-Amazon region in the spatial resolution of 5 arcmin. The random forest regression models presented a good level of mean accuracy for the total, available, organic, inorganic, and occluded P forms (77.37 %, 76,86 %, 75.14 %, 68.23 %, and 64.62% respectively). Our results confirm that the mapped area generally has very low total P concentration status, with a clear gradient of soil development and nutrient content. Total N was the most ...
    Thema/Rubrik (Code) 910
    Sprache Englisch
    Erscheinungsdatum 2024-01-31
    Erscheinungsland de
    Dokumenttyp Buch ; Online
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  5. Artikel: Litter inputs and phosphatase activity affect the temporal variability of organic phosphorus in a tropical forest soil in the Central Amazon

    Schaap, Karst J. / Fuchslueger, Lucia / Hoosbeek, Marcel R. / Hofhansl, Florian / Martins, Nathielly Pires / Valverde-Barrantes, Oscar J. / Hartley, Iain P. / Lugli, Laynara F. / Quesada, Carlos Alberto

    Plant and soil. 2021 Dec., v. 469, no. 1-2

    2021  

    Abstract: PURPOSE: The tropical phosphorus cycle and its relation to soil phosphorus (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant and microbial communities depend on ... ...

    Abstract PURPOSE: The tropical phosphorus cycle and its relation to soil phosphorus (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant and microbial communities depend on abiotic and biotic processes to acquire P. We explored the seasonality and relative importance of drivers controlling the fluctuation of common P pools via processes such as litter production and decomposition, and soil phosphatase activity. METHODS: We analyzed intra-annual variation of tropical soil phosphorus pools using a modified Hedley sequential fractionation scheme. In addition, we measured litterfall, the mobilization of P from litter and soil extracellular phosphatase enzyme activity and tested their relation to fluctuations in P- fractions. RESULTS: Our results showed clear patterns of seasonal variability of soil P fractions during the year. We found that modeled P released during litter decomposition was positively related to change in organic P fractions, while net change in organic P fractions was negatively related to phosphatase activities in the top 5 cm. CONCLUSION: We conclude that input of P by litter decomposition and potential soil extracellular phosphatase activity are the two main factors related to seasonal soil P fluctuations, and therefore the P economy in P impoverished soils. Organic soil P followed a clear seasonal pattern, indicating tight cycling of the nutrient, while reinforcing the importance of studying soil P as an integrated dynamic system in a tropical forest context.
    Schlagwörter enzyme activity ; forest soils ; fractionation ; plant litter ; seasonal variation ; soil organic phosphorus ; tropical forests ; tropical soils ; uncertainty ; Amazonia
    Sprache Englisch
    Erscheinungsverlauf 2021-12
    Umfang p. 423-441.
    Erscheinungsort Springer International Publishing
    Dokumenttyp Artikel
    ZDB-ID 208908-7
    ISSN 1573-5036 ; 0032-079X
    ISSN (online) 1573-5036
    ISSN 0032-079X
    DOI 10.1007/s11104-021-05146-x
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  6. Buch ; Online: Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations

    Quesada, Carlos Alberto / Paz, Claudia / Oblitas Mendoza, Erick / Phillips, Oliver Lawrence / Saiz, Gustavo / Lloyd, Jon

    eISSN: 2199-398X

    2020  

    Abstract: We investigate the edaphic, mineralogical and climatic controls of soil organic carbon (SOC) concentration utilising data from 147 primary forest soils (0–30 cm depth) sampled in eight different countries across the Amazon Basin. Sampled across 14 ... ...

    Abstract We investigate the edaphic, mineralogical and climatic controls of soil organic carbon (SOC) concentration utilising data from 147 primary forest soils (0–30 cm depth) sampled in eight different countries across the Amazon Basin. Sampled across 14 different World Reference Base soil groups, our data suggest that stabilisation mechanism varies with pedogenetic level. Specifically, although SOC concentrations in Ferralsols and Acrisols were best explained by simple variations in clay content – this presumably being due to their relatively uniform kaolinitic mineralogy – this was not the case for less weathered soils such as Alisols, Cambisols and Plinthosols for which interactions between Al species, soil pH and litter quality are argued to be much more important. Although for more strongly weathered soils the majority of SOC is located within the aggregate fraction, for the less weathered soils most of the SOC is located within the silt and clay fractions. It thus seems that for highly weathered soils SOC storage is mostly influenced by surface area variations arising from clay content, with physical protection inside aggregates rendering an additional level of protection against decomposition. On the other hand, most of the SOC in less weathered soils is associated with the precipitation of aluminium–carbon complexes within the fine soil fraction, with this mechanism enhanced by the presence of high levels of aromatic, carboxyl-rich organic matter compounds. Also examined as part of this study were a relatively small number of arenic soils (viz. Arenosols and Podzols) for which there was a small but significant influence of clay and silt content variations on SOM storage, with fractionation studies showing that particulate organic matter may account for up to 0.60 of arenic soil SOC. In contrast to what were in all cases strong influences of soil and/or litter quality properties, after accounting for these effects neither wood productivity, above-ground biomass nor precipitation/temperature variations were found to exert any significant influence on SOC stocks. These results have important implications for our understanding of how Amazon forest soils are likely to respond to ongoing and future climate changes.
    Thema/Rubrik (Code) 910
    Sprache Englisch
    Erscheinungsdatum 2020-02-11
    Erscheinungsland de
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel: Sedimental Journey: Soil Fertility of Fluvial Islands Increases with Proximity to An Amazonian White-Water River

    de Souza Ferreira Neto, Gilson / Baccaro, Fabricio Beggiato / Quesada, Carlos Alberto Nobre / Figueiredo, Axa Simões / Oliveira, Regison / Gomes, Erison / Spironello, Wilson Roberto / Barnett, Adrian A.

    Wetlands. 2021 Dec., v. 41, no. 8

    2021  

    Abstract: The nutrient content of soils is considered a key productivity factor. Sediment input from Amazonian rivers is one of the natural sources of soil fertility for fluvial islands and riverbank flooded forests. Despite the importance of soil factors for ... ...

    Abstract The nutrient content of soils is considered a key productivity factor. Sediment input from Amazonian rivers is one of the natural sources of soil fertility for fluvial islands and riverbank flooded forests. Despite the importance of soil factors for ecosystems, few edaphic studies along fluvial islands sediment-gradients have been undertaken in tropical areas. The current study provides a step forward by describing a mixed water (sediment-poor black water with the input of sediment-rich white water) fluvial archipelago with an emphasis on soil characteristics of seasonally inundated forests. To investigate how geographic distance from a white-water river mouth affects island soil properties, soil chemical and physical attributes, we sampled 61 sites on 35 islands at Jaú and Anavilhanas archipelago. The studied Central Amazon fluvial islands showed high variability in hydromorphic soils properties. In general, the fluvial island soils were acid and with low fertility. Islands from Jaú and other sites closer to the sediment source (Branco River) had higher soil fertility than the Anavilhanas Archipelago islands, which are further away from the sediment source. Our results show that sediment inputs from the Branco River can play an important role in soil properties in a relatively nutrient-poor area, and shed light on the role of biogeochemical processes in the largest freshwater archipelago in the world. Given that soil fertility is often correlated with forest productivity, the results reported here may serve as a baseline to support conservation politics with scientific data for Central Amazonian fluvial island environments.
    Schlagwörter forests ; freshwater ; nutrient content ; politics ; riparian areas ; rivers ; sediments ; soil fertility ; Amazonia
    Sprache Englisch
    Erscheinungsverlauf 2021-12
    Umfang p. 104.
    Erscheinungsort Springer Netherlands
    Dokumenttyp Artikel
    ZDB-ID 1097341-2
    ISSN 1943-6246 ; 0277-5212
    ISSN (online) 1943-6246
    ISSN 0277-5212
    DOI 10.1007/s13157-021-01506-6
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  8. Artikel: Soil fertility and anthropogenic disturbances drive mammal species richness and assemblage composition on tropical fluvial islands

    Ferreira Neto, Gilson de Souza / Baccaro, Fabricio Beggiato / Spironello, Wilson Roberto / Benchimol, Maíra / Fleischer, Katrin / Quesada, Carlos Alberto / Sousa Gonçalves, André Luis / Pequeno, Pedro Aurélio Lima / Barnett, Adrian Paul Ashton

    Austral ecology. 2021 Aug., v. 46, no. 5

    2021  

    Abstract: Floodplain areas comprise some 30% of the area in the Amazon, but are currently under severe anthropogenic threat. Across the Amazon Basin, forest‐dwelling non‐volant mammals play crucial roles in maintaining the integrity of forest functionality, yet ... ...

    Abstract Floodplain areas comprise some 30% of the area in the Amazon, but are currently under severe anthropogenic threat. Across the Amazon Basin, forest‐dwelling non‐volant mammals play crucial roles in maintaining the integrity of forest functionality, yet have been poorly studied in fluvial island forests. Mammal assemblages may be affected by edaphic characteristics that operate indirectly via food nutritional quality, by patch attributes, and/or can be modulated by anthropogenic disturbances. Here, we conducted systematic and quantitative mammal surveys across fluvial islands of an Amazonian archipelago, to assess the influence of edaphic factors (soil fertility), island attributes (island area and degree of isolation) and anthropogenic characteristics (distance from human settlement and logging) on the patterns of mammal species composition and richness. On 28 islands, we conducted spoor surveys and deployed 49 camera traps (total effort of 2940 camera trap‐days). Subsequently, we performed multiple regression analysis to investigate the influence of environmental and anthropogenic predictors on mammal species richness, while dbRDA (distance‐based redundancy analysis) was used for species composition. We found that mammal species richness was positively correlated with soil fertility, and in combination with anthropogenic characteristics, both variables affected the species assemblage composition. In particular, smaller species were found across a variety of levels of soil fertility and anthropogenic disturbances, while larger mammals were mostly recorded at sites with higher soil fertility and low levels of anthropogenic disturbances. Understanding the contribution of environmental and anthropogenic characteristics to the observed mammalian species richness and assemblage composition patterns will help optimise management and conservation efforts on Amazonian fluvial islands. In particular, we suggest enforcing hunting and logging restrictions within fluvial islands through surveillance activities, especially in more fertile islands.
    Schlagwörter basins ; cameras ; floodplains ; forests ; human settlements ; mammals ; monitoring ; nutritive value ; regression analysis ; soil fertility ; species richness
    Sprache Englisch
    Erscheinungsverlauf 2021-08
    Umfang p. 792-801.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 2019899-1
    ISSN 1442-9993 ; 1442-9985
    ISSN (online) 1442-9993
    ISSN 1442-9985
    DOI 10.1111/aec.13023
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  9. Artikel: Tropical Tree Branch-Leaf Nutrient Scaling Relationships Vary With Sampling Location.

    Lira-Martins, Demetrius / Humphreys-Williams, Emma / Strekopytov, Stanislav / Ishida, Francoise Yoko / Quesada, Carlos Alberto / Lloyd, Jon

    Frontiers in plant science

    2019  Band 10, Seite(n) 877

    Abstract: Bivariate relationships between plant tissue nutrient concentration have largely been studied across broad environmental scales regardless of their covariation with soil and climate. Comparing leaf and branch wood concentrations of C, Ca, K, Mg, N, Na, ... ...

    Abstract Bivariate relationships between plant tissue nutrient concentration have largely been studied across broad environmental scales regardless of their covariation with soil and climate. Comparing leaf and branch wood concentrations of C, Ca, K, Mg, N, Na, and P for trees growing in tropical forests in Amazonia and Australia we found that the concentrations of most elements varied with sampling location, but with foliar and branch woody tissues varying from site to site in different ways. Using a Mixed Effect Model (MEM) approach it was further found that relationships between branch and leaf concentrations within individual plots differed in terms of both slope and/or significance to the ordinary least squares (OLS) estimates for most elements. Specifically, using MEM we found that within plots only K and Mg were correlated across organs, but with the K cross-organ intercept estimates varying significantly between sites. MEM analyses further showed that within-plot wood density variations were also negatively related to wood K and Na, suggesting a potentially important role for these cations in water transport and/or storage in woody tissues. The OLS method could not detect significant correlations in any of the above cases. By contrast, although Ca, N, and P leaf and wood tissue concentrations showed similar patterns when individual elements were compared across sites, MEM analyses suggested no consistent association within sites. Thus, for all these three elements, strong within-tree scaling relationships were inferred when data were analyzed across sites using OLS, even though there was no relationship within individual sites. Thus (as for Ca, N, and P) not only can a pooling of data across sites result in trait (co)variations attributable to the environment potentially being incorrectly attributed solely to the species and/or individual (the so-called "ecological fallacy"), but in some cases (as was found here for K and Na) the opposite can also sometimes occur with significant within-site covariations being obscured by large site-site variations. We refer to the latter phenomenon as "environmental obfuscation."
    Sprache Englisch
    Erscheinungsdatum 2019-07-05
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2019.00877
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  10. Artikel ; Online: In situ short-term responses of Amazonian understory plants to elevated CO

    Damasceno, Amanda Rayane / Garcia, Sabrina / Aleixo, Izabela Fonseca / Menezes, Juliane Cristina Gomes / Pereira, Iokanam Sales / De Kauwe, Martin G / Ferrer, Vanessa Rodrigues / Fleischer, Katrin / Grams, Thorsten E E / Guedes, Alacimar V / Hartley, Iain Paul / Kruijt, Bart / Lugli, Laynara Figueiredo / Martins, Nathielly Pires / Norby, Richard J / Pires-Santos, Julyane Stephanie / Portela, Bruno Takeshi Tanaka / Rammig, Anja / de Oliveira, Leonardo Ramos /
    Santana, Flávia Delgado / Santos, Yago Rodrigues / de Souza, Crisvaldo Cássio Silva / Ushida, Gabriela / Lapola, David Montenegro / Quesada, Carlos Alberto Nobre / Domingues, Tomas Ferreira

    Plant, cell & environment

    2024  Band 47, Heft 5, Seite(n) 1865–1876

    Abstract: The response of plants to increasing atmospheric ... ...

    Abstract The response of plants to increasing atmospheric CO
    Mesh-Begriff(e) Photosynthesis/physiology ; Carbon Dioxide ; Forests ; Electron Transport ; Plant Leaves
    Chemische Substanzen Carbon Dioxide (142M471B3J)
    Sprache Englisch
    Erscheinungsdatum 2024-02-09
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 391893-2
    ISSN 1365-3040 ; 0140-7791
    ISSN (online) 1365-3040
    ISSN 0140-7791
    DOI 10.1111/pce.14842
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