Phosphorus supply suppressed microbial necromass but stimulated plant lignin phenols accumulation in soils of alpine grassland on the Tibetan Plateau

Geoderma, Journal Year: 2023, Volume and Issue: 431, P. 116376 - 116376

Published: Feb. 8, 2023

Increased nitrogen (N) and phosphorus (P) inputs have fundamental effects on the soil organic carbon (SOC) composition dynamics. However, responses of plant- microbial-derived SOC components to N P addition in alpine grasslands are poorly understood. Based a 10-year experiment conducted grassland Tibetan Plateau, we used amino sugars lignin phenols as tracers for microbial necromass plant components, respectively, explored their accumulation with P. We found that + (P supply) decreased necromass, whereas did not significant effect. In comparison, supply increased topsoil, but them subsoil. Among these factors, total played non-negligible role controlling soils. addition, ratios fungi-to-bacteria were observed supply. This implies although change significantly, it may eventually loss potential. Collectively, attempted elucidate underlying mechanisms long-term sequestration, which has important implications microbial-mediated processes context increasing inputs.

Language: Английский

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Optimal nitrogen management to achieve high wheat grain yield, grain protein content, and water productivity: A meta-analysis

Agricultural Water Management, Journal Year: 2023, Volume and Issue: 290, P. 108587 - 108587

Published: Nov. 14, 2023

Nitrogen (N) addition is commonly employed to enhance wheat production, and the effectiveness strongly influenced by site-specific factors encompassing environmental conditions crop management practices. However, current understanding fails adequately account for intricate variable interactions among these factors. Consequently, we conducted a global meta-analysis quantify combined contributions of yield, grain protein content (GPC), water productivity (WP) provide recommendations optimizing N management. The results revealed significant improvement in yield (14.85%), GPC (6.62%), WP (10.79%) following application N. Moreover, higher rates, utilization coated fertilizer, post-anthesis fertilization, multiple applications exhibited enhanced outcomes terms GPC, systems. It was observed that applying 100–200 kg/ha optimal rate maximizing WP. Medium soil texture humid climate showed more pronounced increase response addition. Additionally, demonstrated stronger benefits when annual temperature below 14 °C, while with temperatures exceeding °C. Furthermore, adopting common fertilization practices alongside irrigation implementing pre-anthesis medium also contributed achieving performance. finding this study serves as guideline support on-site practice offer reference policy design across specific site conditions.

Language: Английский

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Nitrate nitrogen enhances the efficiency of photoprotection in Leymus chinensis under drought stress

Frontiers in Plant Science, Journal Year: 2024, Volume and Issue: 15

Published: Feb. 14, 2024

Introduction Global climate change exerts a significant impact on the nitrogen supply and photosynthesis ability in land-based plants. The photosynthetic capacity of dominant grassland species is important if we are to understand carbon cycling under change. Drought stress one major factors limiting plant photosynthesis, (N) an essential nutrient involved activity leaves. regulatory mechanisms responsible for effects ammonium (NH 4 + ) nitrate (NO 3 - drought-induced photoinhibition photosystem II (PSII) plants have yet be fully elucidated. Therefore, there need gain better understanding role electron transport PSII. Methods In present study, conducted experiments with normal watering (LD), severe drought (MD), extreme (HD) treatments, along no (N0), ), mixed NO treatments. We analyzed pigment accumulation, reactive oxygen (ROS) enzyme activity, transport, O-J-I-P kinetics. Results Analysis showed that increased application significantly leaf chlorophyll content per unit area (Chl (N (p< 0.05). Under HD treatment, ROS levels were lower -treated than N0 plants, was difference between treated NH . stress, maximum photochemical efficiency PSII (Fv/Fm), rate (ETR), effective quantum yield (φPSII) higher Importantly, K-band G-band Discussion These results suggest hindered formation NADPH ATP L. chinensis thus damaging donor side oxygen-evolving complex (OEC). After applying nitrate, antioxidant not only protected from photodamage but also reduced damage during growth stress.

Language: Английский

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Hotter drought and trade‐off between fast and slow growth strategies as major drivers of tree‐ring growth variability of global conifers

Journal of Ecology, Journal Year: 2024, Volume and Issue: 112(5), P. 1123 - 1139

Published: March 18, 2024

Abstract Temporal growth variability is an important indicator of ecosystem function under climate change. However, we still lack a unified understanding how conditions, change (trends and variability), nitrogen (N) deposition, functional traits stand factors together affect radial variability. Using global conifer tree‐ring records (123 species from 1780 sites) during 1970–2010 to calculate variability, assessed abiotic directly indirectly via with boosted regression tree structural equation models, examined the differences among continents (North America, Asia Europe). We found: (a) was mainly affected by warm‐induced drought increased at lower latitudes. Climate warming in winter could decrease but this effect far not enough offset threat hotter drought; (b) there existed trade‐off between fast‐ slow‐growing (drought tolerance) strategies for species, traits. Contrary common conjecture, higher tolerance revealed due their occupation more xeric sites, may also because investment leads less remaining growth; (c) older trees conservative strategy, while large scales, taller showed occupying productive sites; (d) moderate N deposition reduce leading conifers adopt fast‐growing strategy (e.g. Asia), long‐term excessive led North America Synthesis . Our results suggest that coniferous forests water‐limited regions should be vulnerable drought, ‘fast–slow’ key regulating effects various on stability. Moreover, future will severely threaten growth, especially old

Language: Английский

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Environmental versus phylogenetic controls on leaf nitrogen and phosphorous concentrations in vascular plants

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: June 24, 2024

Abstract Global patterns of leaf nitrogen (N) and phosphorus (P) stoichiometry have been interpreted as reflecting phenotypic plasticity in response to the environment, or an overriding effect distribution species growing their biogeochemical niches. Here, we balance these contrasting views. We compile a global dataset 36,413 paired observations N P concentrations, taxonomy 45 environmental covariates, covering 7,549 sites 3,700 species, investigate how identity variables control variations mass-based N:P ratio. find within-species variation contributes around half total variation, with 29%, 31%, 22% N, P, respectively, explained by variables. Within-species along gradients varies across is highest for lowest N. identified effects on using random forest models, whereas were largely missed widely used linear mixed-effect models. Our analysis demonstrates substantial influence environment driving plastic responses within which challenges reports fixed niche importance distributions shaping P.

Language: Английский

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Dynamics of nonstructural carbohydrates during drought and subsequent recovery: A global meta-analysis

Agricultural and Forest Meteorology, Journal Year: 2025, Volume and Issue: 363, P. 110429 - 110429

Published: Feb. 1, 2025

Language: Английский

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Nutrient Interaction in the Soil-Plant System and Tree Physiological Functional Traits in an Urban Green Infrastructure

Journal of soil science and plant nutrition, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

Language: Английский

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Nonlinear responses of ecosystem carbon fluxes to nitrogen deposition in an old‐growth boreal forest

Ecology Letters, Journal Year: 2021, Volume and Issue: 25(1), P. 77 - 88

Published: Oct. 25, 2021

Nitrogen (N) deposition is known to increase carbon (C) sequestration in N-limited boreal forests. However, the long-term effects of N on ecosystem fluxes have been rarely investigated old-growth Here we show that decade-long experimental additions significantly stimulated net primary production (NPP) but effect decreased with increasing loads. The soil heterotrophic respiration (Rh) shifted from a stimulation at low-level an inhibition higher levels additions. Consequently, resulted neutral productivity (NEP), due comparable stimulating NPP and Rh, while NEP was increased by high-level Moreover, found nonlinear temporal responses NPP, Rh Our findings imply actual forests likely exerts minor contribution their C storage.

Language: Английский

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Effects of nitrogen addition on vegetation and soil and its linkages to plant diversity and productivity in a semi-arid steppe

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 778, P. 146299 - 146299

Published: March 9, 2021

Language: Английский

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Leaf nitrogen from the perspective of optimal plant function

Journal of Ecology, Journal Year: 2022, Volume and Issue: 110(11), P. 2585 - 2602

Published: July 18, 2022

Leaf dry mass per unit area (LMA), carboxylation capacity (

Language: Английский

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