Biotic community shifts explain the contrasting responses of microbial and root respiration to experimental soil acidification

Chen, Dima; Wang, Yang; Lan, Zhichun; Li, Jianjun; Xing, Wen; Hu, Shuijin; Bai, Yongfei

doi:10.1016/j.soilbio.2015.08.009

Cited by 47 publications

(24 citation statements)

References 51 publications

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“…treatment control rate was more than 5 kmol ha −1 yr −1 , which indicates a threshold level of acid deposition driving acidification (Liao and Jiang (2002) In line with our expectation, soil acidification caused a significant reduction in fine root biomass, which is mainly due to the following reasons. First, acid deposition accelerated the leaching of soil base cations (Mg 2+ , Ca 2+ ), further reducing their availability (Vanhala et al 1996, Pennanen et al 1998, Chen et al 2013, Chen et al 2015. This may directly reduce plant uptake for these essential elements, resulting in plant nutrient deficiency and then limiting primary productivity (Kochian 1995, Van Den Berg et al 2005, Vanguelova et al 2007, Chen et al 2013.…”

Section: Discussionmentioning

confidence: 99%

Global soil acidification impacts on belowground processes

Meng

Tian

Zeng

et al. 2019

Environ. Res. Lett.

162

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With continuous nitrogen (N) enrichment and sulfur (S) deposition, soil acidification has accelerated and become a global environmental issue. However, a full understanding of the general pattern of ecosystem belowground processes in response to soil acidification due to the impacting factors remains elusive. We conducted a meta-analysis of soil acidification impacts on belowground functions using 304 observations from 49 independent studies, mainly including soil cations, soil nutrient, respiration, root and microbial biomass. Our results show that acid addition significantly reduced soil pH by 0.24 on average, with less pH decrease in forest than non-forest ecosystems. The response ratio of soil pH was positively correlated with site precipitation and temperature, but negatively with initial soil pH. Soil base cations (Ca 2+ , Mg 2+ , Na + ) decreased while non-base cations (Al 3+ , Fe 3+ ) increased with soil acidification. Soil respiration, fine root biomass, microbial biomass carbon and nitrogen were significantly reduced by 14.7%, 19.1%, 9.6% and 12.1%, respectively, under acid addition. These indicate that soil carbon processes are sensitive to soil acidification. Overall, our meta-analysis suggests a strong negative impact of soil acidification on belowground functions, with the potential to suppress soil carbon emission. It also arouses our attention to the toxic effects of soil ions on terrestrial ecosystems.

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Section: Discussionmentioning

confidence: 99%

Global soil acidification impacts on belowground processes

Meng

Tian

Zeng

et al. 2019

Environ. Res. Lett.

162

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“…Nitrogen enrichment induced changes in R s rates are jointly controlled by changes in an array of factors (both abiotic and biotic), especially changes in the microclimate, plant community composition and aboveground productivity, fine root biomass and productivity, and soil microbial biomass [51]. Overall, N deposition had two effects on the forest's ecosystem: a nutrient effect [19] and an acidification effect [23,36], which are contradictory. The ultimate effect of N addition on R s is determined by which is more advantageous: nutrition or acidification.…”

Section: Soil Respiration Response To N Additionmentioning

confidence: 99%

“…The responses of R s to simulated atmospheric N deposition have been well documented but are inconsistent and controversial among different terrestrial ecosystems. These responses mainly include promotion [17][18][19][20][21][22], inhibition [23][24][25][26], and no significant effect [14,[27][28][29][30] due to the differences in vegetation types, soil conditions (especially the initial soil N levels), and the amount and time of N application that is regulated [18,31,32]. The effects of simulated acid deposition on Rs mainly manifest in two ways.…”

Section: Introductionmentioning

confidence: 99%

Effects of One-Year Simulated Nitrogen and Acid Deposition on Soil Respiration in a Subtropical Plantation in China

Xiao

Wang

Tang

et al. 2020

Forests

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Atmospheric nitrogen (N) and acid deposition have become global environmental issues and are likely to alter soil respiration (Rs); the largest CO2 source is from soil to the atmosphere. However, to date, much less attention has been focused on the interactive effects and underlying mechanisms of N and acid deposition on Rs, especially for ecosystems that are simultaneously subjected to elevated levels of deposition of both N and acid. Here, to examine the effects of N addition, acid addition, and their interactions with Rs, we conducted a two-way factorial N addition (control, CK; 60 kg N ha−1 a−1, LN; 120 kg N ha−1 a−1, HN) and acid addition (control, CK; pH 4.5, LA; pH 2.5, HA) field experiment in a subtropical plantation in China. Our results showed the following: (1) During the one-year observation period, the seasonal dynamics of Rs presented a single peak curve model, which was closely related to the surface soil temperature. (2) The simulated N deposition and acid deposition significantly decreased the Rs in the subtropical plantation. Compared to the CK plots, the LN and HN treatments reduced the annual mean values of Rs by 41% and 56%, and the annual mean values of Rs were inhibited by 26% and 31% in the LA and HA plots. The inhibition of N application on Rs was stronger than that of the simulated acid deposition. (3) Significant interactions between N addition and acid addition on Rs were detected, and Rs was significantly inhibited under four co-addition treatments. (4) The underlying mechanism and main reason for the responses of Rs to simulated N and acid deposition in this study might be the inhibition of soil microbial biomass and soil enzyme activity due to soil acidification under increased N and acid input.

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“…Herein, we tested the impact of short-versus long-term rice-vegetable rotations on the composition pattern of cation pool in paddy soil. Figure 1 showed that soil exchangeable cation pool was dominated by acid cations (H + , Al 3+ ) with pH dropped to 4.82 ( Given that these declines in soil pH may alter microbial biodiversity, and are intimately to soil functioning and in turn agroecosystems integrity [16,17], we argue that changes of microbial biodiversity should be taken into account when assessing the impact of agricultural intensification on soil acidification. We revealed that base-enriched (V0) and acid-enriched (V10 and V20) soils recruited distinct microbiomes (Fig.…”

Section: Discussionmentioning

confidence: 98%

“…Soil acidification is often accompanied by the changes in soil microbial composition, abundance and functions [16,17]. Models for microbial distribution explains acidification development as result of the enrichment of aciduric microbiotas in response to long-term acidic stressors [18,19].…”

mentioning

confidence: 99%

The exacerbation of soil acidification correlates with structural and functional evolution of the soil microbiome upon long-term agricultural intensification

Shen¹,

Luo²,

Li³

et al. 2020

Preprint

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Background: Agricultural intensification induces prolonged impacts on soil acidification (SA), whereas linking the mechanisms therein to structural and functional evolution of soil microbiota remain unclear, especially over longer time scales. Methods: To investigate the short- and long-term effects of agricultural intensification on soil microbiome and its association with SA severity, we performed metagenomic sequencing of soil samples from typical rice-vegetable rotations for 0 (control, V0), 10 (V10), 20 (V20) years. The objectives were to clarify biomarkers that indicative of SA and its putative functions of acid production. Results: Rice-vegetable rotations for 0, 10, 20 years yielded three well-defined soil clusters with differential acid saturation (V0: 4.5%; V10: 11.8%; V20: 40.7%). Soil pH declined significantly (p < 0.05) from the 6.38 (V0) to 4.82 (V20). Acid cations (H + , Al 3+ ) dominating V20’s exchangeable cation pool, suggesting that soils in V20 were highly acidic and acid-sensitive, which recruited distinct microbiomes. The increased acid cations and NO 3 - -N concentrations are driving forces that lead to a higher abundance of Rhodanobacter , Gemmatirosa , Sphingomonas and Streptomyces in V20 samples, which acting as aciduric biomarkers that significantly and positively correlated with soil acidity. Furthermore, functional modules of microbial genes revealed V20 samples contained more genes associated with“oxidative phosphorylation” and “two-component system”, particularly enriched multiple pathways of cytoplasmic pH homeostasis. More specifically, we found increased genetic abundances of active efflux of protons and cytoplasmic proton consumption in V20 samples over than in V0, which are both involved in the microbial dehydrogenation and acid production, and favoured the growth of Rhodanbacter , Gemmatirosa , Sphingomonas , Streptomyces . Conclusions: Collectively, the identified aciduric biomarkers was closely associated with SA severity in intensive agroecosystems. An overall increase with the ongoing of intensive cropping history in the abundance of indicative genes associated with dehydrogenation and acid production pathways. The differential community compositions provide new clues to elucidate the interaction between the soil microbiome and SA severity, and varying dehydrogenation and acid production pathways provide novel insights into the exacerbation of SA. Keywords: Agricultural intensification, Soil acidification, Metagenomics, Soil microbiome, pH homeostasis

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Biotic community shifts explain the contrasting responses of microbial and root respiration to experimental soil acidification

Cited by 47 publications

References 51 publications

Global soil acidification impacts on belowground processes

Global soil acidification impacts on belowground processes

Effects of One-Year Simulated Nitrogen and Acid Deposition on Soil Respiration in a Subtropical Plantation in China

The exacerbation of soil acidification correlates with structural and functional evolution of the soil microbiome upon long-term agricultural intensification

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