Atmospheric nitrogen deposition has minor impacts on the abundance and diversity of arbuscular mycorrhizal fungi and their contribution to soil carbon stock in tropical forests

Soil Biology and Biochemistry, Journal Year: 2025, Volume and Issue: unknown, P. 109746 - 109746

Published: Feb. 1, 2025

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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Soil Microorganisms Mediated the Responses of the Plant–Soil Systems of Neotrinia splendens to Nitrogen Addition and Warming in a Desert Ecosystem

Agronomy, Journal Year: 2024, Volume and Issue: 14(1), P. 132 - 132

Published: Jan. 4, 2024

Covering about 30% of the global total land area, desert ecosystems have been influenced by warming and nitrogen deposition. However, it remains unclear how respond to Therefore, we conducted a greenhouse experiment examine impacts N addition on plant–soil system Neotrinia splendens, dominant plant in ecosystem Northern China. Our findings revealed that low-N dose (N1) high-N additions (N2) increased biomass 22.83% 54.23%, respectively; meanwhile, moderate (T2) severe (T3) decreased 39.07% 45.47%, respectively. did not significantly affect C:N:P stoichiometry system. T2 T3 leaf content 17.50% 16.20%, respectively, P 10.61% 45.29%, This resulted C:N ratio, C:P N:P ratio increasing with warming. Furthermore, or only soil microbial diversity, but also inhibited genera associated nutrient cycling, such as Tumebacillus spp., Bacillus Mortierella spp.; additionally important bacterial functions, nitrate reduction ureolysis. Moreover, induced limitation inhibiting microorganisms, spp. which are transformation; this was brought effects N:P. In conclusion, our results showed had significant through mediation led system, regardless they affected biomass. Soil microorganisms could mediate environmental changes may provide valuable insights for adjusting vegetation restoration strategies under changes.

Language: Английский

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Root functional traits are important predictors for plant resource acquisition strategies in subtropical forests

Ecological Applications, Journal Year: 2025, Volume and Issue: 35(1)

Published: Jan. 1, 2025

Abstract Intercorrelated aboveground traits associated with costs and plant growth have been widely used to predict vegetation in response environmental changes. However, whether underground exhibit consistent responses remains unclear, particularly N‐rich subtropical forests. Responses of foliar root morphological physiological tree herb species after 8‐year N, P, combined N P treatments (50 kg ha −1 year ) were examined leguminous Acacia auriculiformis ( AA nonleguminous Eucalyptus urophylla EU forests southern China. addition did not significantly impact all leaf except concentration per length. Root responded more than trees; however, both similarly herbs. Tree deviated from the expected economics spectrum; aligned spectrum. The altered position principal components analysis functional for compared control. these changes reflect a classic shift nutrient acquisition strategy within As experienced greater limitation, ; their understories indicated no significant differences. This study reveals how adapt nutrient‐rich environments. These findings highlight importance incorporating traits, which show specific additions, into Earth system models accurately predicting global change.

Language: Английский

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Plant use of water across soil depths regulates species dominance under nitrogen addition

Plant Diversity, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Soil pH‐dependent nitrogen stimulation of plant biomass: magnesium and calcium as key constraints

New Phytologist, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Summary Anthropogenic nitrogen (N) deposition can alleviate N limitation and stimulate plant growth in many terrestrial ecosystems. While theoretical models often emphasize phosphorus limitations as a constraint on this positive effect, the impact of N‐induced magnesium (Mg) calcium (Ca) deficits due to soil acidification has been largely overlooked. Here, we synthesized data from 243 experiments across diverse ecosystems investigate role Mg Ca biomass responses addition. We found that effect addition aboveground (AGB) shifted neutral low pH (≤ 4.5) medium (4.5–7.5) high (> 7.5) soils. By contrast, belowground (BGB) were independent pH, leading asymmetric increases AGB BGB. These variations accumulation levels primarily explained by changes foliar concentrations, which negatively affected low‐pH soils but remained stable high‐pH Our findings underscore critical modulating fertilization, providing new insights for improving Earth system better predicting climate–biosphere feedback.

Language: Английский

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Trees show higher resilience than herbs under phosphorus deficit induced by 12‐year simulated acid rain

Ecology, Journal Year: 2025, Volume and Issue: 106(4)

Published: April 1, 2025

Abstract Acid rain, with 60% deposition in Asia, may exacerbate plant phosphorus (P) limitation; however, its long‐term effects on different life‐forms remain largely undetermined. Understanding these is essential for predicting ecosystem resilience and promoting forest health under environmental change. Herein, we investigated the P status two tree herb species their rhizosphere soils after 12 years of acid treatment at three pH levels (pH: 4.0, 3.5, 3.0) a tropical Southern China. We found that leaf, litter, root P; leaf N resorption efficiency; ratios remained stable trees; litter declined. addition reduced inorganic soil organic soil. Rhizosphere fractions were more regulated by physicochemical properties less microbial community trees than herbs. Under simulated benefited from depletion, herbs partially met requirements via biological mineralization P. These distinct P‐associated responses acquisition strategies provide insights into safeguarding among plants functional types rain events.

Language: Английский

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Plant morphological and physiological traits are stable in a nitrogen-saturated tropical forest after 18-year nitrogen additions

Plant and Soil, Journal Year: 2025, Volume and Issue: unknown

Published: April 28, 2025

Language: Английский

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Eleven-Year Canopy Nitrogen Addition Enhances the Uptake of Phosphorus by Plants and Accelerates Its Depletion in Soil

Forests, Journal Year: 2024, Volume and Issue: 15(3), P. 416 - 416

Published: Feb. 22, 2024

Soil phosphorus (P) is a critical factor that limits plant productivity. Enhanced nitrogen (N) deposition has the potential to modify P transformation and availability, thereby potentially affecting long-term productivity of forests. Here, we conducted an 11-year-long field experiment simulate N by adding forest canopy in N-limited northern subtropical central China assessed changes soil organic mineralization, fractions, microbial biomass content, phosphatase activity, content under deposition. Our objective was establish theoretical framework for addressing supply sustaining soils with low particularly changing global setting. The results demonstrated substantial reduction levels total, organic, available owing addition N. Furthermore, there marked decrease proportion total pool. However, no were observed inorganic or within across different treatments. Canopy significantly enhanced mineralization rate, suggesting limited primary source derived from P. substantially increased leaves fine roots while concurrently causing considerable N:P ratio. This indicates increases demand plants. Correlation analysis revealed significant negative association among concentrations (p < 0.05). suggests cause reduced fractions uptake following addition. Various studies have induces augmented plants expedites utilization A accessible caused likely exacerbate regional depletion, exerting adverse impacts on ecosystem

Language: Английский

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Different microbial functional traits drive bulk and rhizosphere soil phosphorus mobilization in an alpine meadow after nitrogen input

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 931, P. 172904 - 172904

Published: May 3, 2024

Language: Английский

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