Direct evidence for phosphorus limitation on Amazon forest productivity

Nature, Journal Year: 2022, Volume and Issue: 608(7923), P. 558 - 562

Published: Aug. 10, 2022

Language: Английский

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Plant phosphorus‐use and ‐acquisition strategies in Amazonia

New Phytologist, Journal Year: 2022, Volume and Issue: 234(4), P. 1126 - 1143

Published: Jan. 21, 2022

In the tropical rainforest of Amazonia, phosphorus (P) is one main nutrients controlling forest dynamics, but its effects on future biomass carbon (C) storage under elevated atmospheric CO2 concentrations remain uncertain. Soils in vast areas Amazonia are P-impoverished, and little known about variation or plasticity plant P-use -acquisition strategies across space time, hampering accuracy projections vegetation models. Here, we synthesize current knowledge leaf P resorption, fine-root foraging, arbuscular mycorrhizal symbioses, root acid phosphatase organic exudation discuss how these vary with soil response to . We identify gaps suggest ways forward fill those gaps. Additionally, propose a conceptual framework for variations along gradients Amazonia. that soils intermediate high concentrations, at community level, investments primarily directed foraging via roots mycorrhizas, whereas low shift prioritize resorption mining phosphatases acids.

Language: Английский

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Depth‐dependent responses of soil organic carbon under nitrogen deposition

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(3)

Published: March 1, 2024

Abstract Emerging evidence points out that the responses of soil organic carbon (SOC) to nitrogen (N) addition differ along profile, highlighting importance synthesizing results from different layers. Here, using a global meta‐analysis, we found N significantly enhanced topsoil (0–30 cm) SOC by 3.7% (±1.4%) in forests and grasslands. In contrast, subsoil (30–100 initially increased with but decreased over time. The model selection analysis revealed experimental duration vegetation type are among most important predictors across wide range climatic, environmental, edaphic variables. contrasting indicate considering deep layers, particularly for long‐term continuous deposition. Finally, lack depth‐dependent modeling frameworks has likely resulted overestimation changes storage under

Language: Английский

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Root phosphatase activity aligns with the collaboration gradient of the root economics space

New Phytologist, Journal Year: 2021, Volume and Issue: 234(3), P. 837 - 849

Published: Dec. 7, 2021

The adoption of diverse resource acquisition strategies is critical for plant growth and species coexistence. Root phosphatase particular importance in the soil phosphorus (P), yet it often overlooked studies root trait syndromes. Here, we evaluated role activity (RPA) within economics space order-based variation RPA, as well correlations between RPA a suite leaf traits properties over range evergreen tree subtropical forest. exhibited high degree inter-specific variation. We found that there were two leading dimensions multidimensional space, diameter-specific length axis (collaboration gradient) tissue density-root nitrogen concentration (classical gradient), aligned with former. used 'do yourself' strategy P acquisition, was to be inversely correlated mycorrhizal colonization, which suggests trade-off strategies. Compared foliar nutrient status, mattered most large changes RPA. Furthermore, generally decreased from first- third-order roots. Taken together, such P-acquisition are conducive coexistence local forest communities. use easily measurable their tight could feasible promising approach estimating species-specific values, would helpful better understanding cycling.

Language: Английский

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Increasing calcium scarcity along Afrotropical forest succession

Nature Ecology & Evolution, Journal Year: 2022, Volume and Issue: 6(8), P. 1122 - 1131

Published: July 4, 2022

Language: Английский

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Experimental warming altered plant functional traits and their coordination in a permafrost ecosystem

New Phytologist, Journal Year: 2023, Volume and Issue: 240(5), P. 1802 - 1816

Published: July 11, 2023

Knowledge about changes in plant functional traits is valuable for the mechanistic understanding of warming effects on ecosystem functions. However, observations have tended to focus aboveground traits, and there little information belowground or coordination above- under climate warming, particularly permafrost ecosystems. Based a 7-yr field experiment, we measured 26 four dominant species, explored community composition trait networks response experimental Tibetan Plateau. Experimental shifted community-level toward more acquisitive values, with earlier green-up, greater height, larger leaves, higher photosynthetic resource-use efficiency, thinner roots, specific root length nutrient concentrations. had negligible effect terms diversity. In addition, hub which highest centrality network from area leaf area. These results demonstrate that exhibit consistent adaptive strategies, warmer environments. Such could provide an advantage plants environmental change.

Language: Английский

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Toward a coordinated understanding of hydro‐biogeochemical root functions in tropical forests for application in vegetation models

New Phytologist, Journal Year: 2024, Volume and Issue: 242(2), P. 351 - 371

Published: Feb. 28, 2024

Summary Tropical forest root characteristics and resource acquisition strategies are underrepresented in vegetation global models, hampering the prediction of forest–climate feedbacks for these carbon‐rich ecosystems. Lowland tropical forests often have globally unique combinations high taxonomic functional biodiversity, rainfall seasonality, strongly weathered infertile soils, giving rise to distinct patterns traits functions compared with higher latitude We provide a roadmap integrating recent advances our understanding belowground function into focusing on water nutrient acquisition. offer comparisons empirical model that represent important processes forests. focus on: (1) fine‐root soil exploration, (2) coupling trade‐offs vs acquisition, (3) aboveground–belowground linkages plant use. suggest avenues representing extremely diverse communities computationally manageable ecologically meaningful groups models linked hydro‐nutrient functions. undergoing warming, shifting regimes, exacerbation scarcity caused by elevated atmospheric CO 2 . The accurate representation is crucial interactions this biome climate.

Language: Английский

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Enhanced silicate weathering accelerates forest carbon sequestration by stimulating the soil mineral carbon pump

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(8)

Published: Aug. 1, 2024

Abstract Enhanced silicate rock weathering (ERW) is an emerging strategy for carbon dioxide removal (CDR) from the atmosphere to mitigate anthropogenic climate change. ERW aims at promoting soil inorganic sequestration by accelerating geochemical processes. Theoretically, may also impact organic (SOC), largest pool in terrestrial ecosystems, but experimental evidence this largely lacking. Here, we conducted a 2‐year field experiment tropical rubber plantations southeast of China evaluate effects wollastonite powder additions (0, 0.25, and 0.5 kg m −2 ) on both 0–10 cm depth. We found that significantly increased concentration SOC HCO 3 − , increases were four eight times higher than with low‐ high‐level applications. had positive accrual mineral‐associated matter (MAOM) macroaggregate fractions, not particulate matter. Path analysis suggested MAOM mainly increasing release Ca, Si, Fe, lesser extent stimulating root growth microbial‐derived inputs. Our study indicates can promote stable MOAM surface soils through mineral pump microbial pump. These have been larger CDR during our experiment. argue it essential account responses assessments ERW.

Language: Английский

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Fine roots stimulate nutrient release during early stages of leaf litter decomposition in a Central Amazon rainforest

Plant and Soil, Journal Year: 2021, Volume and Issue: 469(1-2), P. 287 - 303

Published: Oct. 2, 2021

Abstract Purpose Large parts of the Amazon rainforest grow on weathered soils depleted in phosphorus and rock-derived cations. We tested hypothesis that this ecosystem, fine roots stimulate decomposition nutrient release from leaf litter biochemically by releasing enzymes, exuding labile carbon stimulating microbial decomposers. Methods monitored a Central tropical rainforest, where were either present or excluded, over 188 days added substrates (glucose citric acid) fully factorial design. tracked mass loss, remaining carbon, nitrogen, cation concentrations, extracellular enzyme activity concentrations. Results Fine root presence did not affect loss but significantly increased cations litter. In roots, acid phosphatase was 43.2% higher, while neither stoichiometry, nor activities targeting carbon- nitrogen-containing compounds changed. Glucose additions when present, enhanced exclusions. Citric reduced biomass nitrogen phosphorus, regardless exclusion. Conclusions conclude plant significant amounts phosphatases into layer mobilize without affecting loss. Our results further indicate inputs ( i.e . glucose) can production decomposers, highlighting potential importance plant-microbial feedbacks forest ecosystems.

Language: Английский

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Eighteen‐year nitrogen addition does not increase plant phosphorus demand in a nitrogen‐saturated tropical forest

Journal of Ecology, Journal Year: 2023, Volume and Issue: 111(7), P. 1545 - 1560

Published: May 25, 2023

Abstract Nitrogen (N) deposition usually increases plant tissue N concentrations and thus phosphorus (P) demand in young and/or N‐limited forests, but the effect on P has rarely been assessed N‐saturated forests. Impacts of 18‐year external additions (Control: 0, Low N: 50, Moderate N:100 High 150 kg ha −1 year ) leaf four life‐forms (tree, shrub, herb liana), fractions bulk rhizosphere soils were examined a mature tropical forest southern China. Leaf N, ratios all remained stable under three additions. Among soil fractions, moderate labile organic increased by 25%–33% across additions; total was 11.76% 8.87% compared with control. The PLS‐PM results showed that path coefficient microbial community to available significantly inorganic decreased than improved availability through microbe‐mediated transformation: taxonomic diversity, higher diversity could enlarge sources nutrient acquisition stimulate decomposition recalcitrant matters; while remaining microorganisms screened N‐rich environments had characteristics resisting addition effects maintained efficient acquisition. Synthesis. Our findings provide novel line evidence long‐term did not increase forest. underlying mechanism is plants uptakes therefore nor (a stoichiometry) an already ecosystem. Different rates regulated transformation via transition. These help improve understanding modelling biogeochemical N–P cycling vegetation productivity ecosystems, particularly considering fact chronic may likely lead richness even saturation many forests future.

Language: Английский

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