Temperature and moisture alter organic matter composition across soil fractions

Cates, Anna M.; Jilling, Andrea; Tfaily, Malak M.; Jackson, Randall D.

doi:10.1016/j.geoderma.2021.115628

Cited by 19 publications

(13 citation statements)

References 93 publications

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“…These results differ from others who report that labile C pools are impacted by temperature and moisture, and stable C pools are affected by only moisture (21,23,75). Our results may differ from others simply because precipitation swings during the 2021 growing season may have overwhelmed temperature effects (23,75). That being said, within season fluctuations in soil C pools may have also been impacted by short-term management perturbations and not just weather events.…”

Section: Short-term Weather Alters Soil C Pools and Stability Over A ...contrasting

confidence: 99%

“…Temperature may have affected POXC and GLU as increased temperature has been found to enhance microbial activity and the decomposition of complex C (73,74). These results differ from others who report that labile C pools are impacted by temperature and moisture, and stable C pools are affected by only moisture (21,23,75). Our results may differ from others simply because precipitation swings during the 2021 growing season may have overwhelmed temperature effects (23,75).…”

Section: Short-term Weather Alters Soil C Pools and Stability Over A ...contrasting

confidence: 92%

“…Our results indicated that measures of the labile C pool were sensitive to precipitation but not temperature, whereas measures of C decay and processed pools of C were impacted by both precipitation and temperature. Given that moisture and a minimum temperature is essential for aggregate formation, it is not surprising that both precipitation and temperature would affect processed C pools, as increased aggregation can lead to the protection of processed C pools (23,(68)(69)(70). Precipitation has been found to alter labile C pools, reduced precipitation shrinks soil water films and increases the soils ionic strength to C, which results in a decrease of labile C (71,72).…”

Section: Short-term Weather Alters Soil C Pools and Stability Over A ...mentioning

confidence: 99%

“…For instance, Cates etal. (23) found that low molecular weight C storage was impacted by temperature and moisture, while more protected pools of C were solely altered by moisture. Similarly, Benbi and Khosa (21) found that labile C pools were more sensitive to temperature relative to mineral associated organic matter.…”

Section: Introductionmentioning

confidence: 96%

“…Soil health indictors that reflect functionally different pools have been measured across a wide range of managed and unmanaged systems (15,19,20), yet we have a limited understanding of how Min C, POXC, and GLU respond to short-term changes in temperature and precipitation at the field scale. Previous laboratory-based experiments have widely demonstrated that labile and protected pools of C respond differently to changes in moisture and temperature (21)(22)(23). For instance, Cates etal.…”

Section: Introductionmentioning

confidence: 99%

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Sensitive Measures of Soil Health Reveal Carbon Stability Across a Management Intensity and Plant Biodiversity Gradient

Martin

Sprunger

2022

Front. Soil Sci.

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Soil carbon (C) is a major driver of soil health, yet little is known regarding how sensitive measures of soil C shift temporally within a single growing season in response to short-term weather perturbations. Our study aimed to i) Examine how long-term management impacts soil C cycling and stability across a management intensity and plant biodiversity gradient and ii) Assess how sensitive soil health indicators change temporally over the course of a single growing season in response to recent weather patterns. Here we quantify a variety of sensitive soil C measures at four time points across the 2021 growing season at the W.K. Kellogg Biological Station’s Long Term Ecological Research Trial (LTER) located in southwest Michigan, USA. The eight systems sampled included four annual soybean (Glycine max) systems that ranged in management intensity (conventional, no-till, reduced input, and biologically-based), two perennial biofuel cropping systems (switchgrass (Panicum virgatum) and hybrid poplars (Populus nigra x P.maximowiczii)), and two unmanaged systems (early successional system and a mown but never tilled grassland). We found that unmanaged systems with increased perenniality enhanced mineralizable C (Min C) and permanganate oxidizable C (POXC) values. Additionally, all soil health indicators were found to be sensitive to changes in short-term weather perturbations over the course of the growing season. The implications of this study are threefold. First, this study assess indicators of labile and stable C pools over the course of the growing season and reflects the stability of soil C in different systems. Second, POXC, Min C, and ß-glucosidase (GLU) activity are sensitive soil health indicators that fluctuate temporally, which means that these soil health indicators could help elucidate the impact that weather patterns have on soil C dynamics. Lastly, for effective monitoring of soil C, sampling time and frequency should be considered for a comprehensive understanding of soil C cycling within a system.

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Section: Short-term Weather Alters Soil C Pools and Stability Over A ...contrasting

confidence: 99%

Section: Short-term Weather Alters Soil C Pools and Stability Over A ...contrasting

confidence: 92%

Section: Short-term Weather Alters Soil C Pools and Stability Over A ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Sensitive Measures of Soil Health Reveal Carbon Stability Across a Management Intensity and Plant Biodiversity Gradient

Martin

Sprunger

2022

Front. Soil Sci.

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Effect of alkali residue and humic acid on aggregate structure of saline‐alkali soil

Liu,

Shang,

Han

et al. 2024

Soil Science Soc of Amer J

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Humic acid (HA) and alkali residue (AR) exert an essential impact on soil aggregate structure, but how HA and AR promote the formation of macroaggregates jointly is not clear. The aim of this research was to explore influence of alkali residue and humic acid (AHA) on the structure and stability of soil aggregates, with saline‐alkali soil in North China as an example. The morphology and structure of the soil with AHA added were detected by a scanning electron microscope, Fourier transform infrared spectroscopy, and X‐ray diffraction. Soil aggregate structure was analyzed by mean weight diameter (MWD), geometric mean diameter (GMD), and fractal dimension (D), and the trend of soil colloid forming macroaggregates was evaluated by zeta potential and surface charge. The results showed that under dry and wet sieves, MWD and GMD both surged initially and then decreased with the rise of AHA content, while D had the opposite trend. With the addition of 3%, AHA, MWD, and GMD reached their peak which proves that the proportion of soil macroaggregates was the highest. In the meantime, absolute value of zeta potential was low, which illustrates that the soil colloid system was in an unstable state of condensation and microaggregates tend to transform into macroaggregates. A large number of ions such as Ca2+ and Mg2+ in AHA promoted variable charge of saline‐alkali soil, and the binding frequency of Ca2+ with negatively charged humus and soil colloid particles was increased. AHA holds great promise for improving the aggregate structure of saline‐alkali soil.

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Experimental flooding shifts carbon, nitrogen, and phosphorus pool distribution and microbial activity

et al. 2023

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Flooding transforms the soil environment, impacting small-scale controls on mineral associated carbon (C), nitrogen (N) and phosphorus (P) stabilization and mobilization. Yet during ood events, mineral associated C, N, and P may not respond in the same way, such that soluble C, N, and P concentrations and stoichiometry may change with unknown consequences for microbial activity. Using a laboratory incubation approach, we investigated how ooding impacts C, N, and P pool distribution and microbial activity across a 1-week ood event and after drying. We found that all three mineral associated pools responded dynamically to ooding, increasing and decreasing throughout the ood with a net increase of 5.9% in mineral associated C and 32.5% decrease in residual P. However, mineral associated C, N, and P each shifted at different temporal points, indicating that they are likely responding to separate destabilization mechanisms working at different temporal scales. The soluble C and N responses to ooding contrasted the mineral associated pool's response, increasing by 57% and decreasing by 72% respectively at the beginning of the ood which remained post-ood. However, soluble P behaved more similarly to the mineral associated pool. The microbial community maintained and even increased their exo-cellular activity throughout the ood period, responding most strongly to changes in available P. Our research demonstrates that the mineral associated pool is sensitive to short-term ooding altering the composition and quantity of water extracted compounds and microbial activity.

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Temperature and moisture alter organic matter composition across soil fractions

Cited by 19 publications

References 93 publications

Sensitive Measures of Soil Health Reveal Carbon Stability Across a Management Intensity and Plant Biodiversity Gradient

Sensitive Measures of Soil Health Reveal Carbon Stability Across a Management Intensity and Plant Biodiversity Gradient

Effect of alkali residue and humic acid on aggregate structure of saline‐alkali soil

Experimental flooding shifts carbon, nitrogen, and phosphorus pool distribution and microbial activity

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