Nitrogen deposition-induced stimulation of soil heterotrophic respiration is counteracted by biochar in a subtropical forest

Agricultural and Forest Meteorology, Journal Year: 2024, Volume and Issue: 349, P. 109940 - 109940

Published: Feb. 27, 2024

Language: Английский

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Plant disease risk is modified by multiple global change drivers

Current Biology, Journal Year: 2023, Volume and Issue: 33(11), P. R574 - R583

Published: June 1, 2023

Plant diseases are strongly influenced by host biodiversity, spatial structure, and abiotic conditions. All of these undergoing rapid change, as the climate is warming, habitats being lost, nitrogen deposition changing nutrient dynamics ecosystems with ensuing consequences for biodiversity. Here, I review examples plant–pathogen associations to demonstrate how our ability understand, model predict disease becoming increasingly difficult, both plant pathogen populations communities extensive change. The extent this change via direct combined effects global drivers, especially latter still poorly understood. Change at one trophic level expected drive also other, hence feedback loops between plants their pathogens changes in risk through ecological well evolutionary mechanisms. Many discussed here an increase a result ongoing suggesting that unless we successfully mitigate environmental going become heavy burden on societies far-reaching food security functioning ecosystems.

Language: Английский

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Nitrogen deposition affects the productivity of planted and natural forests by modulating forest climate and community functional traits

Forest Ecology and Management, Journal Year: 2024, Volume and Issue: 563, P. 121970 - 121970

Published: May 17, 2024

Language: Английский

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Context dependencies in the responses of plant biomass and surface soil organic carbon content to nitrogen addition and precipitation change within alpine grasslands

Agriculture Ecosystems & Environment, Journal Year: 2025, Volume and Issue: 381, P. 109475 - 109475

Published: Jan. 10, 2025

Language: Английский

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Multiple mechanisms associated with loss of seed bank diversity under nitrogen enrichment

Journal of Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Abstract The soil seed bank is a hidden community below‐ground and crucial component of plant biodiversity. Nitrogen (N) enrichment can reduce species diversity both in above‐ground communities banks. However, the mechanisms by which N affects banks are not clear. We investigated direct indirect an addition experiment alpine meadow on eastern Tibetan Plateau. combined litter data, fungal diversity, surveys rain monitoring, conducted burial to explore viability. found that rate loss was slower than communities. directly affected decreasing viability enhancing germination. Furthermore, small seeds were more prone increased germination under large seeds. At same time, also indirectly decreased richness number altering composition increasing amount diversity. through rain, with negative effects due higher levels enrichment. Synthesis . Our results provide novel insights into multiple lead enrichment, important ramifications maintenance biodiversity, ecosystem resilience restoration N‐enriched systems.

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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Revisiting the bucket model: Long‐term effects of rainfall variability and nitrogen enrichment on net primary production in a desert grassland

Journal of Ecology, Journal Year: 2024, Volume and Issue: 112(3), P. 629 - 641

Published: Jan. 15, 2024

Abstract The predicted intensification of the North American Monsoon is expected to alter growing season rainfall patterns in southwestern United States. These patterns, which have historically been characterized by frequent small rain events, are anticipated shift towards a more extreme precipitation regime consisting fewer, but larger events. Furthermore, human activities contributing increased atmospheric nitrogen deposition throughout this dryland region. Alterations size and frequency, along with changes availability, likely significant consequences for above‐ground net primary production (ANPP) plant community dynamics drylands. conceptual bucket model predicts that events could promote greater rates ANPP these regions maintaining soil moisture availability above drought stress thresholds longer periods during season. However, only few short‐term studies tested hypothesis, none explored interaction between altered enrichment. To address knowledge gap, we conducted 14‐year addition fertilization experiment northern Chihuahuan Desert grassland explore long‐term impacts monsoon chronic enrichment, on (measured as peak biomass) dynamics. Contrary predictions, promoted comparable large infrequent absence It was when limitation alleviated resulted greatest ANPP. found enrichment had impact composition under regime. Synthesis . Our field highlights limitations demonstrating water sequentially limit ecological processes. Specifically, our findings suggest while limiting factor ecosystems, becomes increasingly important not limiting. Moreover, reveal play an underappreciated role driving ecosystem

Language: Английский

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Nitrogen availability in soil controls uptake of different nitrogen forms by plants

New Phytologist, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 11, 2024

Nitrogen (N) uptake by plant roots from soil is the largest flux within terrestrial N cycle. Despite its significance, a comprehensive analysis of for inorganic and organic forms across grasslands lacking. Here we measured in situ 13 dominant species along 3000 km transect spanning temperate alpine grasslands. To generalize our experimental findings, synthesized data on 60 studies encompassing 148 world-wide. Our revealed that had faster NH

Language: Английский

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Herbivory and nutrients shape grassland soil seed banks

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: July 4, 2023

Abstract Anthropogenic nutrient enrichment and shifts in herbivory can lead to dramatic changes the composition diversity of aboveground plant communities. In turn, this alter seed banks soil, which are cryptic reservoirs diversity. Here, we use data from seven Nutrient Network grassland sites on four continents, encompassing a range climatic environmental conditions, test joint effects fertilization mammalian similarity between communities banks. We find that decreases species richness banks, homogenizes bank Fertilization increases abundance especially presence herbivores, while effect is smaller absence herbivores. Our findings highlight weaken maintaining mechanism grasslands, needs be considered when assessing abundance.

Language: Английский

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Long-Term Nitrogen Addition Exerts Minor Effects on Microbial Community but Alters Sensitive Microbial Species in a Subtropical Natural Forest

Forests, Journal Year: 2023, Volume and Issue: 14(5), P. 928 - 928

Published: April 30, 2023

Increasing nitrogen (N) deposition profoundly affects nutrient cycling in soil, thereby influencing forest ecosystem productivity and function. Soil microorganisms are integral driving turnover; the changes microbial communities response to N associated soil availability, especially of limited nutrients, far from clear. To explore bacterial fungal their key environmental drivers under deposition, we conducted a multilevel field addition experiment Castanopsis carlesii natural forest. properties were investigated. There no significant alpha diversities (presented as Chao1 Shannon’s indexes) beta bacteria fungi among three treatments. Consistently, relative abundances dominant phyla (i.e., Proteobacteria, Acidobacteria, Actinobacteria, Chloroflexi, Planctomycetes) Basidiomycota, Ascomycota, Rozellomycota) did not change following addition. These results suggest that alter community diversity structure. In addition, Mantel test showed pH, NO3−-N, dissolved organic (DON), total phosphorus (TP) predominantly influenced structure bacteria, but fungi. Meanwhile, abundance some sensitive genera, such Bryobacter, Bradyrhizobium, Sorangium, Archaeorhizomyces, significantly decreased. indicate decreased ability for fixation P mobilization induced by deposition. Moreover, there relationships between Archaeorhizomyces NO3−-N available (AP), suggesting responses groups likely depend on nutrients or P. Collectively, 6 years had influence communities, with turnover. This finding emphasizes critical roles species meditating climate change.

Language: Английский

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