Contrasting geochemical and fungal controls on decomposition of lignin and soil carbon at continental scale

Huang, Wenjuan; Yu, Wenjuan; Yi, Bo; Raman, Erik; Yang, Joo Young; Hammel, Kenneth E.; Timokhin, Vitaliy I.; Lü, Chaoqun; Howe, Adina; Weintraub, Samantha R.; Hall, Steven J.

doi:10.1038/s41467-023-37862-6

Cited by 20 publications

(10 citation statements)

References 69 publications

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“…This can be related to low moisture as the experiment was started in the dry season. In such conditions soil microbial activity is slothful that ingrowth of microbial biomass and subsequent splintering through penetration into leaf litter require su cient moisture (Paudel et But the mass loss was swift from 3 to 9 months in this study due to higher moisture in this period and higher nutrient concentration (Bradford et al 2016;Huang et al 2023). Then again litter mass loss was showed steady-state from 9 to 12 months (Fig.…”

Section: Litter Decompositionmentioning

confidence: 72%

Litter Production and Decomposition in Agro-ecosystems of Aleta Chuko District of Sidama Region, Ethiopia

Argado,

Wele,

Amdie

2024

Preprint

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Litter fall and decomposition in agro-ecosystems varies by tree species where indigenous and exotic species were mixed. In such diversified species, litter decomposition and nutrient dynamics are not well understood in Aleta Chuko. This study was aimed at measuring litter fall of seven abundant woody species in Coffee-Enset based agroforestry (CEA) and eucalyptus camaldulensis woodlots; determining decomposition rate and nutrient contents of leaf litter. Three replicates for each species which were distributed over three transect lines, were used for litter fall and in situ decomposition experiment for one year by using litter traps and nylon-mesh litter-bag respectively. Mean monthly litter fall ranges from 40.9 for M. indica to 79.7 g m− 2 for O. kenyensis in CEA while it was 54.8 g m− 2 for E. camaldulensis. There was a significant difference in litter production among studied species (P < 0.05). Also, there was a significant difference in decay constant among studied species (P < 0.05). Indigenous species such as C. arabica, C. africana and M. ferruginea showed greater value of decay constant as compared to exotic species such as E.camaldulensis, P.americana and M. indica. C. arabica showed fastest decomposition with decay constant of 2.4 while it was 1.1 for E.camaldulensis. There was a significant loss of initial litter Ca, K and Mg contents within annual decomposition for all studied species. Whereas loss-gain condition of P, Na and N contents vary by woody species. Further research is required on nutrient dynamics of diverse plant species; particularly on factors responsible for increase or decrease in nutrient contents.

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Section: Litter Decompositionmentioning

confidence: 72%

Litter Production and Decomposition in Agro-ecosystems of Aleta Chuko District of Sidama Region, Ethiopia

Argado,

Wele,

Amdie

2024

Preprint

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“…This also implicated that the remaining stable DOM pool for the low-HS regions was more recalcitrant after long-term biological transformation, as DOM from the low-HS regions exhibited lower biodegradation during 45–165 days (Figure c). Because lignin-like molecules were mainly negatively correlated with the BDOC and decomposed much more slowly than many other organic compounds. ,, …”

Section: Resultsmentioning

confidence: 99%

“…As a refractory resource for microbes, terrestrial DOM consists of high proportions of complex and aromatic compounds (e.g., lignin- and polyphenol-like molecules) . Nonetheless, many studies have reported biodegradation of these compounds, albeit at much lower rates than the bulk soil carbon decomposition. − The nature of organic compounds also influences their biological transformation. For example, some small-sized molecules and macromolecules can be consumed by microbes rapidly, , and the hydrophilicity of DOM can increase its biodegradability .…”

Section: Introductionmentioning

confidence: 99%

Divergent Fate and Roles of Dissolved Organic Matter from Spatially Varied Grassland Soils in China During Long-Term Biogeochemical Processes

Zhou,

Tian,

Siddique

et al. 2024

Environ. Sci. Technol.

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Terrestrial dissolved organic matter (DOM) is critical to global carbon and nutrient cycling, climate change, and human health. However, how the spatial and compositional differences of soil DOM affect its dynamics and fate in water during the carbon cycle is largely unclear. Herein, the biodegradation of DOM from 14 spatially distributed grassland soils in China with diverse organic composition was investigated by 165 days of incubation experiments. The results showed that although the high humified fraction (high-HS) regions were featured by high humic-like fractions of 4−25 kDa molecular weight, especially the abundant condensed aromatics and tannins, they unexpectedly displayed greater DOM degradation during 45− 165 days. In contrast, the unique proteinaceous and 25−100 kDa fractions enriched in the low humified fraction (low-HS) regions were drastically depleted and improved the decay of bulk DOM but only during 0−45 days. Together, DOM from the high-HS regions would cause lower CO 2 outgassing to the atmosphere but higher organic loads for drinking water production in the short term than that from the low-HS regions. However, this would be reversed for the two regions during the long-term transformation processes. These findings highlight the importance of spatial and temporal variability of DOM biogeochemistry to mitigate the negative impacts of grassland soil DOM on climate, waters, and humans.

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“…Soil samples spanned a broad range of biogeochemical characteristics (Table S1) and land cover types (forest, grassland/shrubland, and wetland). In the laboratory incubation dataset, the decomposition of C 4 grass litter, 13 C-labeled lignin, and soil C was monitored over time (Figure 2) by measuring the stable C isotope ratio (δ 13 C) values of CO 2 from replicates of each soil that received substrates with different δ 13 C values; these empirical data are described in detail in our published paper (Huang et al, 2023). Three separate treatments were implemented for each soil sample: including (1) incubating the soil alone; (2) the soil amended with C 4 grass (Androgopon gerardi) litter + natural abundance synthetic lignin; and (3) the soil amended with C 4 grass litter + 13 C-labeled lignin at the C β position of the propyl sidechain.…”

Section: Status Of Laboratory Incubation Datamentioning

confidence: 99%

“…How to cite this article: Yi, B., Lu, C., Huang, W., Yu, W., Yang, J., Howe, A., Weintraub-Leff, S. R., & Hall, S. J. (2023).…”

Section: Ack N Owled G M Entsmentioning

confidence: 99%

Resolving the influence of lignin on soil organic matter decomposition with mechanistic models and continental‐scale data

Lü

Huang

et al. 2023

Global Change Biology

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Confidence in model estimates of soil CO2 flux depends on assumptions regarding fundamental mechanisms that control the decomposition of litter and soil organic carbon (SOC). Multiple hypotheses have been proposed to explain the role of lignin, an abundant and complex biopolymer that may limit decomposition. We tested competing mechanisms using data‐model fusion with modified versions of the CN‐SIM model and a 571‐day laboratory incubation dataset where decomposition of litter, lignin, and SOC was measured across 80 soil samples from the National Ecological Observatory Network. We found that lignin decomposition consistently decreased over time in 65 samples, whereas in the other 15 samples, lignin decomposition subsequently increased. These “lagged‐peak” samples can be predicted by low soil pH, high extractable Mn, and fungal community composition as measured by ITS PC2 (the second principal component of an ordination of fungal ITS amplicon sequences). The highest‐performing model incorporated soil biogeochemical factors and daily dynamics of substrate availability (labile bulk litter:lignin) that jointly represented two hypotheses (C substrate limitation and co‐metabolism) previously thought to influence lignin decomposition. In contrast, models representing either hypothesis alone were biased and underestimated cumulative decomposition. Our findings reconcile competing hypotheses of lignin decomposition and suggest the need to precisely represent the role of lignin and consider soil metal and fungal characteristics to accurately estimate decomposition in Earth‐system models.

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Contrasting geochemical and fungal controls on decomposition of lignin and soil carbon at continental scale

Cited by 20 publications

References 69 publications

Litter Production and Decomposition in Agro-ecosystems of Aleta Chuko District of Sidama Region, Ethiopia

Litter Production and Decomposition in Agro-ecosystems of Aleta Chuko District of Sidama Region, Ethiopia

Divergent Fate and Roles of Dissolved Organic Matter from Spatially Varied Grassland Soils in China During Long-Term Biogeochemical Processes

Resolving the influence of lignin on soil organic matter decomposition with mechanistic models and continental‐scale data

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