Coherent responses of terrestrial C:N stoichiometry to drought across plants, soil, and microorganisms in forests and grasslands

Sun, Yuan; Liao, Jiahui; Zou, Xiaoming; Xu, Xuan; Yang, Jinyan; Chen, Han Y. H.; Ruan, Honghua

doi:10.1016/j.agrformet.2020.108104

Cited by 33 publications

(23 citation statements)

References 46 publications

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“…As anticipated, our analysis revealed that the effects of altered precipitation on C:N:P stoichiometry tended to increase with precipitation intensity and experimental duration (Figures 4 and 5). The pronounced changes in the C:N:P stoichiometry of plants, soils and microorganisms under higher precipitation intensities and longer precipitation duration were expected, as terrestrial C:N:P stoichiometry is greatly influenced by soil moisture, which was altered severely by precipitation of higher magnitudes (Sun, Liao, et al., 2020; Yuan & Chen, 2015). Cumulatively, our study demonstrated that the lack of effects of altered precipitation on C:N:P stoichiometry in certain ecosystem compartments of some studies is attributable to lower precipitation intensities and shorter experimental durations (Chen et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…We observed the negative impacts of R− and positive impacts of R+ in the C:N ratios of plants and soils (Figure 2). The positive relationship between the plant C:N ratio and water availability is likely due to expedited plant growth under higher water availability, which requires more C relative to N (Sun, Liao, et al., 2020). Additionally, the soil C:N ratio responded positively to R+, whereas it responded negatively to R−.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, ecosystems were classified as forests (including tropical forests, temperate grasslands and boreal forests) or grasslands (encompassing shrublands, grasslands and meadows) (Figure 1). To better quantify the effects of precipitation treatments, we calculated the absolute precipitation intensity as: [(soil moisture after precipitation treatment – soil moisture under control groups)/(soil moisture under control groups)] (Sun, Liao, et al., 2020; Sun et al., 2020b). Experimental duration referred to the number of days between the initiation of the experiment and the measurements.…”

Section: Methodsmentioning

confidence: 99%

“…The responses of plants, soils, and microbial biomass C:N:P stoichiometry to precipitation change may be more pronounced with increasing precipitation intensity and experimental duration because plants and soils may adapt to environmental stresses at low magnitudes (Sardans et al., 2012; Yue et al., 2017). Additionally, the effects of precipitation change may differ with ecosystems due to variations in the plant community, vegetation physiology, soil types and associated climates (Deng et al., 2021; Sun, Liao, et al., 2020). However, to what extent the effects of precipitation change on terrestrial C:N:P stoichiometry vary by precipitation intensity, experimental duration, ecosystems, and climates remain uncertain.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric responses of terrestrial C:N:P stoichiometry to precipitation change

Sun

Wang

Chen

et al. 2021

Global Ecol. Biogeogr.

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Aim The aim was to test whether the responses of C:N:P stoichiometry in plant–soil–microorganism systems to precipitation changes support the prediction of the double asymmetry model, which predicts ecological processes (i.e. aboveground productivity, soil microbial community, and soil respiration) are more sensitive to increased precipitation (R+) than decreased precipitation (R−) under normal precipitation changes, whereas more sensitive to R− than R+ under extreme precipitation changes. Location Global. Time period 1999–2020. Major taxa studied Plants, soils, and soil microorganisms. Methods We performed a global meta‐analysis of 848 observations (587 R− and 261 R+ manipulations) from 160 studies, which tested the effects of precipitation changes on C:N:P across plants, soils, and soil microorganisms. The data encompassed broad variations in ecosystems, climate, precipitation intensity, and experimental duration. Results We revealed that the C:N and C:P ratios of different ecosystem compartments were more sensitive to moderate R+ rather than moderate R−, whereas they exhibited a higher response to extreme R− rather than extreme R+, which supported the prediction of the double asymmetry model. Moreover, such responses were more pronounced under higher precipitation intensities and longer experimental duration. The effects of precipitation changes on the C:N:P stoichiometry of plants, soils, and soil microorganisms were consistent across ecosystem types (i.e. forests and grasslands) and associated background climates (i.e. mean annual temperature and precipitation). Main conclusions Our findings provide the first evidence of the asymmetric responses of C:N:P stoichiometry in above‐ and belowground systems to precipitation change. These results extend the double asymmetric model and improve our understanding of C and N cycling, as well as facilitate the prediction of ecosystem responses to precipitation changes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Asymmetric responses of terrestrial C:N:P stoichiometry to precipitation change

Sun

Wang

Chen

et al. 2021

Global Ecol. Biogeogr.

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“…Current soil C models are primarily developed using the soil C decomposition process (Todd‐Brown et al., 2013), and rarely integrate microbial mechanisms to predict soil C dynamics (Buchkowski et al., 2015). Soil microbial attributes, such as microbial community compositions and biomass, are very sensitive to climate changes (Li et al., 2020; Sun, Liao, et al., 2020). With mounting data on microbial biomass (Xu et al., 2013), it is urgent to incorporate soil microbial mechanisms into the global C cycling model (Wieder et al., 2015).…”

Section: Discussionmentioning

confidence: 99%

Elevated CO₂ shifts soil microbial communities from K‐ to r‐strategists

Sun

Wang

Yang

et al. 2021

Global Ecol. Biogeogr.

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Aims Soil microbes are key to myriad processes in terrestrial ecosystems. Elevated CO2 represents a dominant driver of global climate change; however, it remains unclear to what extent elevated CO2 impacts soil microbial communities at ecosystem and global scales. Here, we sought to address the following questions: (a) Do the compositions of microbial communities shift from K‐ to r‐strategists under elevated CO2? (b) What is the extent of the compositional shifts of microbial communities affected by elevated CO2 concentrations, experimental duration, ecosystem types and/or background climates? (c) Are the responses of microbial communities to elevated CO2 associated with changes in soil pH and carbon and nitrogen availabilities? Location Global. Time period 1998–2020. Major taxa studied Soil microbes. Methods We performed a global meta‐analysis of 965 observations from 122 studies, which tested the effects of elevated CO2 on microbial communities. The data covered broad variations in ecosystems, climate, CO2 concentrations, experimental duration, and soil factors. Results We revealed that elevated CO2 decreased the K‐ to r‐strategist ratios with decreasing fungi : bacteria, Gram+ : Gram– bacteria, and Acidobacteria : Proteobacteria ratios, and increased bacterial biomass, microbial biomass carbon, Gram– bacteria, and Acidobacteria abundance. Moreover, the shifts from K‐ to r‐strategists were more pronounced under higher CO2 concentrations and longer experimental durations. The responses of microbial attributes to elevated CO2 did not differ significantly among croplands, forests and grasslands. Furthermore, the response of microbial biomass to elevated CO2 was negatively correlated with the response of soil pH, while those of bacterial biomass and fungi : bacteria ratios were positively correlated with those of soil organic carbon and soil carbon : nitrogen ratios, respectively. Main conclusions Our results suggest that elevated CO2 shifts soil microbial communities from K‐ to r‐strategists, and provide supportive evidence for understanding responses of soil microbial processes to elevated CO2.

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Drought is threatening plant growth and soil nutrients of grassland ecosystems: A meta‐analysis

Liu

Siri

et al. 2023

Ecology and Evolution

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As a widespread direct effect of global warming, drought is currently wreaking havoc on terrestrial ecosystems' structure and function, however, the synthesized analysis is lacked to explore the general rules between drought changes and main functional factors of grassland ecosystems. In this work, meta‐analysis was used to examine the impacts of drought on grassland ecosystems in recent decades. According to the results, drought greatly reduced aboveground biomass (AGB), aboveground net primary production (ANPP), height, belowground biomass (BGB), belowground net primary production (BNPP), microbial biomass nitrogen (MBN), microbial biomass carbon (MBC) and soil respiration (SR), and increased dissolved organic carbon (DOC), total nitrogen (TN), total phosphorus (TP), nitrate nitrogen (NO3−‐N), and the ratio of microbial biomass carbon and nitrogen (MBC/MBN). The drought‐related environmental factor mean annual temperature (MAT) was negatively correlated with AGB, height, ANPP, BNPP, MBC, and MBN, however, mean annual precipitation (MAP) had positive effect on these variables. These findings indicate that drought is threatening the biotic environment of grassland ecosystem, and the positive steps should be taken to address the negative effects of drought on grassland ecosystems due to climate change.

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Coherent responses of terrestrial C:N stoichiometry to drought across plants, soil, and microorganisms in forests and grasslands

Cited by 33 publications

References 46 publications

Asymmetric responses of terrestrial C:N:P stoichiometry to precipitation change

Asymmetric responses of terrestrial C:N:P stoichiometry to precipitation change

Elevated CO₂ shifts soil microbial communities from K‐ to r‐strategists

Drought is threatening plant growth and soil nutrients of grassland ecosystems: A meta‐analysis

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Coherent responses of terrestrial C:N stoichiometry to drought across plants, soil, and microorganisms in forests and grasslands

Cited by 33 publications

References 46 publications

Asymmetric responses of terrestrial C:N:P stoichiometry to precipitation change

Asymmetric responses of terrestrial C:N:P stoichiometry to precipitation change

Elevated CO2 shifts soil microbial communities from K‐ to r‐strategists

Drought is threatening plant growth and soil nutrients of grassland ecosystems: A meta‐analysis

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Elevated CO₂ shifts soil microbial communities from K‐ to r‐strategists