Contrasting effects of altered precipitation regimes on soil nitrogen cycling at the global scale

Wu, Qiqian; Yue, Kai; Ma, Yahong; Heděnec, Petr; Cai, Yanjiang; Chen, Jian; Zhang, Hui; Shao, Junjiong; Chang, Scott X.; Li, Yan

doi:10.1111/gcb.16392

Cited by 27 publications

(19 citation statements)

References 112 publications

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“…Leaf N content and C:N and N:P ratios were sensitive to medium DPPT (Figure 4b,d,f), providing additional evidence that DPPT primarily influenced the N cycle in plants. In humid areas, leaf N content, and C:N and N:P ratios exhibited high sensitivity to DPPT (Table S1), aligning with previous studies that drought increased plant N uptake in humid areas (Wu et al, 2022). One possible mechanism is that drought reduced N losses through leaching, particularly in humid areas (Austin & Vitousek, 2000; Hao et al, 2017).…”

Section: Discussionsupporting

confidence: 89%

C:N:P stoichiometry of plants, soils, and microorganisms: Response to altered precipitation

Li,

Deng,

Peñuelas

et al. 2023

Global Change Biology

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Precipitation changes modify C, N, and P cycles, which regulate the functions and structure of terrestrial ecosystems. Although altered precipitation affects above‐ and belowground C:N:P stoichiometry, considerable uncertainties remain regarding plant–microbial nutrient allocation strategies under increased (IPPT) and decreased (DPPT) precipitation. We meta‐analyzed 827 observations from 235 field studies to investigate the effects of IPPT and DPPT on the C:N:P stoichiometry of plants, soils, and microorganisms. DPPT reduced leaf C:N ratio, but increased the leaf and root N:P ratios reflecting stronger decrease of P compared with N mobility in soil under drought. IPPT increased microbial biomass C (+13%), N (+15%), P (26%), and the C:N ratio, whereas DPPT decreased microbial biomass N (−12%) and the N:P ratio. The C:N and N:P ratios of plant leaves were more sensitive to medium DPPT than to IPPT because drought increased plant N content, particularly in humid areas. The responses of plant and soil C:N:P stoichiometry to altered precipitation did not fit the double asymmetry model with a positive asymmetry under IPPT and a negative asymmetry under extreme DPPT. Soil microorganisms were more sensitive to IPPT than to DPPT, but they were more sensitive to extreme DPPT than extreme IPPT, consistent with the double asymmetry model. Soil microorganisms maintained stoichiometric homeostasis, whereas N:P ratios of plants follow that of the soils under altered precipitation. In conclusion, specific N allocation strategies of plants and microbial communities as well as N and P availability in soil critically mediate C:N:P stoichiometry by altered precipitation that need to be considered by prediction of ecosystem functions and C cycling under future climate change scenarios.

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Section: Discussionsupporting

confidence: 89%

C:N:P stoichiometry of plants, soils, and microorganisms: Response to altered precipitation

Li,

Deng,

Peñuelas

et al. 2023

Global Change Biology

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“…The NH 4 + -N concentration was higher under 100% soil water content across all freeze-thaw treatments. This result is contrary to the results reported by Wu et al [60], who found that precipitation decreased the soil NH 4 + -N. However, the increase in the NH 4 + -N concentration under 100% soil water content did not happen under CK, but was observed under the LF, SFQT, and QFST treatments, wherein the mean concentration increased approximately twofold as compared to under 30% and 60% soil water content levels. We supposed that a high water content enhances the positive effect of freezing on the NH 4 + -N concentration.…”

Section: The Changes In Soil Nutrients Enzyme Activities and Soil Mic...contrasting

confidence: 97%

Freeze–Thaw Cycles Have More of an Effect on Greenhouse Gas Fluxes than Soil Water Content on the Eastern Edge of the Qinghai–Tibet Plateau

et al. 2023

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The Qinghai-Tibetan Plateau (QTP) is sensitive to global climate change. This is because it is characterized by irregular rainfall and freeze–thaw cycles resulting from its high elevation and low temperature. Greenhouse gases (GHGs) mainly contribute to the warming of the QTP, but few studies have investigated and compared the effects of irregular rainfall and freeze–thaw cycles on GHGs. In this study, we conducted a laboratory experiment under four types of freeze–thaw treatments with three soil water content levels to simulate the irregular freeze–thaw and rainfall conditions. The results showed that both the soil water content and freeze–thaw treatment influenced the soil properties, soil enzyme activities, and the microbial biomass; however, the freeze–thaw treatment had significantly higher influences on GHG fluxes than soil water content. In order to explore other biotic and abiotic factors in an attempt to establish the main factor in determining GHG fluxes, a variation partition analysis was conducted. The results revealed that freeze–thaw treatments were the strongest individual factors in predicting the variance in N2O and CO2 fluxes, and the pH, which was only significantly affected by freeze–thaw treatment, was the strongest individual factor in predicting CH4 flux. Across the water content levels, all the freeze–thaw treatments increased the N2O flux and reduced the CH4 flux as compared to the CK treatment. In addition, long-term freezing reduced the CO2 flux, but the treatment of slowly freezing and quickly thawing increased the CO2 flux. In summary, these results suggest that the freeze–thaw treatments had quite different effects on N2O, CH4, and CO2 fluxes, and their effects on GHG fluxes are more significant than those of soil water content on the eastern edge of the QTP.

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“…In our study, warming reduced soil inorganic N concentrations, which was consistent with some previous studies (Durán et al, 2016; Zhang et al, 2005). This might be due to reduced organic matter decomposition, limited ion mobility in drier soils (Jarvi & Burton, 2018; Joseph et al, 2021), and/or increased N leaching loss under warming (Wu et al, 2022). However, soil N availability is relatively higher in subtropical areas and warming can also increase root N uptake capacity (Cao et al, 2020; Jiang et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

“…accelerate climatic warming, catalyzing a positive feedback loop (Woodwell & Mackenzie, 1995) and reducing the C available for plant biomass production (Jarvi & Burton, 2018). However, if root respiration acclimatizes to increasing temperature, the potential negative effects of warming on net C increases in plants and ecosystems will be greatly reduced (Jarvi & Burton, 2018).…”

mentioning

confidence: 99%

Substrate and adenylate limit subtropical tree fine‐root respiration under soil warming

Jiang

Jia

Chen

et al. 2023

Plant Cell & Environment

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How root respiration acclimates to global warming remains unclear, especially in subtropical forests that play a key role in the global carbon budget. In a large‐scale in situ soil warming experiment, the occurrence of, and mechanisms controlling over, the acclimation of fine‐root respiration of Cunninghamia lanceolata during the fourth year of warming were investigated. Specific respiration rates (at reference temperature of 20°C; SRR20) were measured with exogenous glucose addition, uncoupler addition, or no addition, and root morphological and chemical traits were also measured. Warming decreased SRR20 by 18.4% only during summer, indicating partial thermal acclimation of fine‐root respiration under warming. Warming did not change fine‐root N concentration, showing no possible enzyme limitation on respiration. Warming decreased root soluble sugar/starch ratio in summer, and glucose addition increased respiration only under warming, indicating a warming‐induced substrate limitation on respiration. Uncoupler addition also stimulated respiration only under warming, showing a warming‐induced adenylate limitation on respiration. These findings suggest that thermal acclimation of root respiration in subtropical forests, which is at least partially constrained by substrate and adenylate use, is conducive to reducing ecosystem carbon emissions and mitigating the positive feedback between atmospheric CO2 and climate warming.

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Contrasting effects of altered precipitation regimes on soil nitrogen cycling at the global scale

Cited by 27 publications

References 112 publications

C:N:P stoichiometry of plants, soils, and microorganisms: Response to altered precipitation

C:N:P stoichiometry of plants, soils, and microorganisms: Response to altered precipitation

Freeze–Thaw Cycles Have More of an Effect on Greenhouse Gas Fluxes than Soil Water Content on the Eastern Edge of the Qinghai–Tibet Plateau

Substrate and adenylate limit subtropical tree fine‐root respiration under soil warming

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