Spatiotemporal variation of enhanced vegetation index in the Amazon Basin and its response to climate change

Physics and Chemistry of the Earth Parts A/B/C, Journal Year: 2021, Volume and Issue: 123, P. 103024 - 103024

Published: April 28, 2021

Language: Английский

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Shrub encroachment impaired the structure and functioning of alpine meadow communities on the Qinghai–Tibetan Plateau

Land Degradation and Development, Journal Year: 2022, Volume and Issue: 33(14), P. 2454 - 2463

Published: May 3, 2022

Abstract Shrub encroachment has been rapidly occurring due to climate change, with profound ecological consequences for the alpine meadows of Qinghai–Tibetan Plateau. Here, we conducted field surveys along a shrub coverage gradient examine effects on structure and functioning meadows' plant communities. Our results showed that overall coverage, density, aboveground biomass, species richness, diversity meadow community gradually declined increasing levels encroachment, especially when exceeded 60%. Aboveground ecosystem multifunctionality also decreased gradient. With 90% relative importance value forbs functional group significantly increased while Cyperaceae opposite trend: originally dominant sedges Carex moorcroftii Kobresia myosuroides were replaced by Androsace umbellate Polygonum sparsipilosum . Additionally, had strong effect nonrandom herb extinction colonization. At coverages higher than 60%, there 9 absent 18 new colonizing—7 which only observed in coverage. Rare those lower stature more likely go extinct, taller shade‐tolerant tended colonize areas Overall, our indicate negatively affects herbaceous functioning, important implications management Plateau under ongoing change.

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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Plant functional traits and biodiversity can reveal the response of ecosystem functions to grazing

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 899, P. 165636 - 165636

Published: July 22, 2023

Language: Английский

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Impacts of Extreme Drought Events at Different Phenophases on the Aboveground Net Primary Productivity (Anpp) and its Photosynthetic Physiological Regulatory Process of Artemisia Ordosica

Published: Jan. 1, 2025

Climate change has intensified the frequency of extreme drought events in desert ecosystems, accompanied by uneven distribution annual precipitation. Whether precipitation at different phenophases have equivalent impacts on plants is an unverified topic, yet it crucial for understanding mechanisms vegetation adaptation to changes This study focuses typical plant Artemisia ordosica and employs situ control experiments using rain shelters simulate (30 consecutive days removal) three phenophases: sprouting stage, vegetative growth flowering fruiting stage. Against this backdrop, phenological differences leaf photosynthetic physiological regulatory that affect accumulation Aboveground Net Primary Productivity (ANPP) A. under were explored, including parameters such as gas exchange, chlorophyll fluorescence, antioxidant enzymes. The findings reveal that: (1) Extreme markedly reduced photosynthesis leaves, subsequently leading significantly reduction ANPP (p<0.05). With impact degree ordered follows: stage > stage; (2) During events, experiences a decrease exchange capacity enhancement water use efficiency, which are stomatal responses. Additionally, there increase thermal dissipation, decline photochemical activity (such potential PSII, initial light energy conversion actual quantum yield, quenching), augmentation enzyme system, non-stomatal responses; (3) phenophases, dominant factor rate leaves regulation. However, sensitivity regulation during more sensitive compared other phenophases. Non-stomatal most with heightened modulation fluorescence. reveals response offering innovative perspective ecological ecosystems face climate change.

Language: Английский

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Spatiotemporal Variation in Carbon and Water Use Efficiency and Their Influencing Variables Based on Remote Sensing Data in the Nanling Mountains Region

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(4), P. 648 - 648

Published: Feb. 14, 2025

A comprehensive evaluation of the variations in carbon use efficiency (CUE) and water (WUE) Nanling Mountains Region (NMR) is crucial for gaining insights into intricate relationships between climate change ecosystem processes. This study evaluates spatiotemporal rates dynamics CUE, WUE, gross primary productivity (GPP), net (NPP), evapotranspiration (ET) over period from 2001 to 2023, using remote sensing data linear regression analysis. Trend analysis, Hurst exponent stability analysis were applied examine long-term patterns CUE while partial correlation was employed explore spatial these efficiencies climatic factors. The main findings are as follows: (1) WUE NMR decreased geographically both showed a significant declining trend (p < 0.05) with decreasing at rate 0.0014/a (a: year) falling 0.0022/a. (2) average values 2023 0.47 0.82 g C·m−2·mm−1, respectively, clear geographical difference. (3) widespread degradation trends some localized improvements, yet sustainability indicates likely continued decline across most areas, particularly forests, grasslands exhibit greatest resilience. (4) Precipitation had significantly stronger impact on temperature appeared exert more substantial effect vegetation types responding differently; notably, shrubland displayed direct association temperature. In summary, multi-source comprehensively analyze past 23 years. We also examined features their responses global warming, offering valuable theoretical within terrestrial ecosystems NMR.

Language: Английский

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Nitrogen enrichment exacerbates drought impacts on desert shrub steppe plant community

Agriculture Ecosystems & Environment, Journal Year: 2025, Volume and Issue: 388, P. 109667 - 109667

Published: April 6, 2025

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C:N:P stoichiometry in plant, soil and microbe in Sophora moorcroftiana shrubs across three sandy dune types in the middle reaches of the Yarlung Zangbo River

Frontiers in Plant Science, Journal Year: 2023, Volume and Issue: 13

Published: Jan. 11, 2023

The alpine sandy dune ecosystem is highly vulnerable to global climate change. Ecological stoichiometry in plants and soils plays a crucial role biogeochemical cycles, energy flow functioning ecosystems. However, the stoichiometric changes correlations of among different types dunes have not been fully explored. Three (moving dune, MD; semifixed SFD; fixed FD) Sophora moorcroftiana shrub middle reaches Yarlung Zangbo River were used as subjects current study. Plant community characteristics, soil physicochemical properties, carbon (C), nitrogen (N), phosphorus (P) contents leaves, understorey herbs, litter, microbes evaluated explore C:N:P its driving factors. Sandy type significant affected on soils. High N:P ratio was observed FD high plant C:P ratios SFD MD. C:N decreased with sand stabilization compared other resources. Leaf S. higher than those herb biomass, because low P concentrations leaves. C, N litter microbe significantly correlated stoichiometry, correlation for ratio. mainly limiting factor growth population study area demand became increasingly critical increase age. variation modulated by moisture, pH, available dissolved organic C. These findings provide key information nutrient patterns, element distribution utilization strategies well scrubland restoration management valley

Language: Английский

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Variation of vegetation fractional coverage and its relationship with climate in a desert steppe: optimization of farmland layout in a farming–pastoral ecotone using the ecological suitability index

Ecological Engineering, Journal Year: 2020, Volume and Issue: 150, P. 105834 - 105834

Published: April 22, 2020

Language: Английский

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Seasonal community stability increased with water addition and shrub removal but reduced with nitrogen addition in semi‐arid grassland

Functional Ecology, Journal Year: 2023, Volume and Issue: 37(3), P. 690 - 702

Published: Jan. 8, 2023

Abstract Stability is a useful indicator of the functioning and sustainability an ecosystem, much studies have explored effects anthropogenic disturbance on inter‐annual stability plant community. However, multiple stressors seasonal community not been clearly elucidated, especially for vulnerable semi‐arid grasslands. During growing season in 5th year experiment, we determined how nitrogen (N) addition, water addition shrub removal altered grassland dominated by Caragana microphylla Mongolian Plateau. We found that removal, N had different functional groups (PFGs). Shrub increased mostly via increases perennial forbs C 4 plants, did alter or PFG stability. decreased decreases rhizome grasses plants. Water annuals biennials, forbs, grasses, dominant species Species asynchrony but richness soil abiotic biotic variables helped to maintain under addition. Our findings indicate future scenarios deposition encroachment will strongly reduce drylands, precipitation together with might help this other dryland ecosystems. Read free Plain Language Summary article Journal blog.

Language: Английский

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