Differential effects of pH on temperature sensitivity of organic carbon and nitrogen decay

Min, Kweon Sik; Lehmeier, C.; Ballantyne, Ford; Tatarko, Anna R.; Billings, Sharon A.

doi:10.1016/j.soilbio.2014.05.021

Cited by 67 publications

(75 citation statements)

References 46 publications

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“…5). Changes in soil pH may have indirect effects on BG activity either by influencing its temperature sensitivity or by influencing the C:N flow ratio (from decomposing organic substrate) which becomes available for microbial assimilation (Min et al 2014). In our study it is possible that increases in root C:N ratios associated with liming (under the N-only fertilization treatment) may have contributed to increases in C availability thus promoting declines in microbial C use efficiency which ultimately reduced soil C gain efficiency per unit of N added to limed plots.…”

Section: Discussionmentioning

confidence: 99%

Chronic nitrogen fertilization and carbon sequestration in grassland soils: evidence of a microbial enzyme link

et al. 2015

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Chronic nitrogen (N) fertilization can greatly affect soil carbon (C) sequestration by altering biochemical interactions between plant detritus and soil microbes. In lignin-rich forest soils, chronic N additions tend to increase soil C content partly by decreasing the activity of lignin-degrading enzymes. In cellulose-rich grassland soils it is not clear whether cellulose-degrading enzymes are also inhibited by N additions and what consequences this might have on changes in soil C content. Here we address whether chronic N fertilization has affected (1) the C content of light versus heavier soil fractions, and (2) the activity of four extracellular enzymes including the C-acquiring enzyme b-1,4-glucosidase (BG; necessary for cellulose hydrolysis). We found that 19 years of chronic N-only addition to permanent grassland have significantly increased soil C sequestration in heavy but not in light soil density fractions, and this C accrual was associated with a significant increase (and not decrease) of BG activity. Chronic N fertilization may increase BG activity because greater N availability reduces root C:N ratios thus increasing microbial demand for C, which is met by C inputs from enhanced root C pools in N-only fertilized soils. However, BG activity and total root mass strongly decreased in high pH soils under the application of lime (i.e. CaCO 3 ), which reduced the ability of these organo-mineral soils to gain more C per units of N added. Our study is the first to show a potential 'enzyme link' between (1) long-term additions of inorganic N to grassland soils, and (2) the greater C content of organo-mineral soil fractions. Our new hypothesis is that the 'enzyme link' occurs because (a) BG activity is stimulated by increased microbial C demand relative to N under chronic fertilization, and (b) increased BG activity causes more C from roots and from microbial Responsible Editor: Sharon A. Billings. Electronic supplementary materialThe online version of this article

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Section: Discussionmentioning

confidence: 99%

Chronic nitrogen fertilization and carbon sequestration in grassland soils: evidence of a microbial enzyme link

et al. 2015

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“…All exoenzymes assayed are commonly used by soil microbes to decompose soil organic matter prior to substrate uptake and mineralization to CO 2 : β-1,4-glucosidase (BGase), β-1-4-N-acetylglucosaminidase (NAGase), phosphatemonoester phosphohydrolase (APase), and phenol oxidase (POase). These methods are described in detail elsewhere (DeForest, 2009;Lehmeier et al, 2013;Min et al, 2014). Extracellular enzyme activities are reported as pmol g -1 dry soil h -1 .…”

Section: Ex Situ Biogeochemical Fluxesmentioning

confidence: 99%

Loss of deep roots limits biogenic agents of soil development that are only partially restored by decades of forest regeneration

Billings

Hirmas

Sullivan

et al. 2018

Elementa: Science of the Anthropocene

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“…Soil pH affects soil enzymatic activity through the structure of soil microbial community, which in turn indirectly influences Q 10 (Craine et al, 2010b;Min et al, 2014). Soil base saturation increases with decreasing pH, which leads to the increased heterogeneity of microbes and increased enzyme activity.…”

Section: Soil Microbial Properties Control the Responses Of Q 10mentioning

confidence: 99%

“…Soil base saturation increases with decreasing pH, which leads to the increased heterogeneity of microbes and increased enzyme activity. Consequently, a positive feedback loop is formed for soil heterotrophic respiration (Sinsabaugh et al, 2008;Min et al, 2014). In this way, the pH might indirectly reflect variation in Q 10 .…”

Section: Soil Microbial Properties Control the Responses Of Q 10mentioning

confidence: 99%

“…Some studies have shown that the adaptation of soil microbes changes differently when temperature increases or decreases (Fenner et al, 2005;Bradford et al, 2008). Moreover, abiotic soil properties, such as oxidation-reduction potential (ORP), pH (Min et al, 2014), and the substrate used for microbial metabolism (Blagodatskaya et al, 2014), might influence R S , because these soil properties regulate microbial activity directly or indirectly. Microbial adaptation when the temperature rises or decreases might generate a hysteresis phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric responses of soil heterotrophic respiration to rising and decreasing temperatures

et al. 2017

Soil Biology and Biochemistry

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Differential effects of pH on temperature sensitivity of organic carbon and nitrogen decay

Cited by 67 publications

References 46 publications

Chronic nitrogen fertilization and carbon sequestration in grassland soils: evidence of a microbial enzyme link

Chronic nitrogen fertilization and carbon sequestration in grassland soils: evidence of a microbial enzyme link

Loss of deep roots limits biogenic agents of soil development that are only partially restored by decades of forest regeneration

Asymmetric responses of soil heterotrophic respiration to rising and decreasing temperatures

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