Microbial assimilation dynamics differs but total mineralization from added root and shoot residues is similar in agricultural Alfisols

Xu, Yingde; Sun, Ling; Lal, Rattan; Bol, Roland; Wang, Yang; Gao, Xiaodan; Ding, Fan; Liang, Siwei; Li, Shuangyi; Wang, Jingkuan

doi:10.1016/j.soilbio.2020.107901

Cited by 33 publications

(11 citation statements)

References 64 publications

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“…The elevated organic substrate and nutrients provided by manure and chemical fertilizers in the fertilization soil eliminate the C and P (the primary limiting nutrient for fungi) limitation, and accelerate the growth of fungi 14 . Besides, large amounts of maize root residues remaining in the fertilization treatment could also contribute to the reproduction of saprophytic populations, because of the predominant role of saprophytic fungi in decomposing cellulose and lignin, the primary components of maize residue 63 . However, it is worthy to mention that, although long-term fertilization increased the F/B ratio, the GluN/MurA ratio did not show significant differences between control and fertilization treatments in bulk soil (Figs.…”

Section: Discussionmentioning

confidence: 99%

Contrasting response of fungal versus bacterial residue accumulation within soil aggregates to long-term fertilization

Sun

Gao

et al. 2022

Sci Rep

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Soil microorganisms are critical for soil carbon (C) cycling. They primarily regulate the turnover of the soil organic C (SOC) by adjusting their community structure, and contributing residues with a considerable amount to the resistant SOC. Nevertheless, how long-term fertilization (e.g., the combination of manure and chemical fertilizer) affects the spatial distribution of both living microbial communities and dead microbial residue within soil aggregate fractions remains largely unclear. In this study, we analyzed changes in microbial community (lipid biomarkers) and microbial residue retention (amino sugar biomarkers), and also calculated the contribution of microbial residue to organic C in bulk soil and different soil aggregates (> 2 mm, 1–2 mm, 0.25–1 mm, and < 0.25 mm) in Alfisols treated with 29 years fertilization or no fertilization (control). Our results showed that long-term fertilization significantly increased the mean weight diameter (MWD) of aggregates and organic C contents in all aggregate fractions. The fertilization treatment increased the contents of PLFAs and microbial residue C, but the relative contribution of microbial residue to SOC was higher in the control (56.8% vs. 49.0%), due to the low SOC background caused by much lower level of non-microbially derived C input. These results suggested that long-term fertilization could increase SOC by accumulating both plant- and microbial-derived C, while the C deficient soil is more dependent on the accumulation of microbial residues. Long-term fertilization promoted the enrichment of bacterial-derived muramic acid in micro aggregates, but increased the proportion of fungal-derived glucosamine in macro aggregates. Meanwhile, the contribution of bacterial residue to organic C in the fertilization treatment was higher in micro aggregates (7.6% for > 2 mm vs. 9.2% for < 0.25 mm aggregate), while the contribution of fungal residue was higher in macro aggregate fractions (40.9% for > 2 mm vs. 35.7% for < 0.25 mm aggregate). The above results indicated that long-term fertilization could drive the differentiation of heterogeneous microbial residue accumulation patterns that significantly alter the contribution of fungal- versus bacterial-derived C to organic C within soil aggregate fractions.

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Section: Discussionmentioning

confidence: 99%

Contrasting response of fungal versus bacterial residue accumulation within soil aggregates to long-term fertilization

Sun

Gao

et al. 2022

Sci Rep

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“…However, the duration of the effect of DOC addition on microbial biomass was different from other carbon sources. For example, the addition of glucose may cause an increase in microbial biomass in 1-2 days (20,21), while with the addition of litter, microbial biomass usually reaches its maximum after a few months (22,23). The observed duration and magnitude of the increase of microbial biomass probably depend on the quality and quantity of added C. Previous studies found that if the quantity of addition active carbon was less than native soil microbial biomass C, it only increased microbial activity but did not cause the increase of microbial biomass (55).…”

Section: Discussionmentioning

confidence: 99%

“…As a key natural component of forest carbon cycle, plant-derived DOC is more complex than simple organic substances and includes a rapidly decomposable fraction and a slowly decomposable fraction (17,18), and the addition of litter-derived DOC might affect the microbial biomass and extracellular enzyme activity as well as causing a possible shift in the microbial community composition (19). Previous studies proved that glucose addition caused an increase in microbial biomass in 1-2 days (20,21), while litter addition caused the maximum increase of microbial biomass in a few months (22,23). Recent research showed that the proportion of added litter-derived C entering soil microbial groups nearly disappeared after 18 months (1-2 years), indicating little long-term utilization of litter-derived C by soil microorganisms (16).…”

Section: Introductionmentioning

confidence: 99%

Effect of Litter-Derived Dissolved Organic Carbon Addition on Forest Soil Microbial Community Composition

Wang

Tian²,

Liao³

et al. 2021

Front. Soil Sci.

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The input of dissolved organic carbon (DOC) into soil affects soil organic carbon mineralization and microbial community composition by changing carbon availability. However, up to now, there is little knowledge about the microbial groups that utilize the added DOC and how the incorporation process may vary over time. In this study, we added 13C-labeled litter-derived DOC (treatment) or pure water (control) to a forest soil from different layers to investigate the effects of DOC addition on soil microbial biomass and community composition in a 180-d laboratory incubation experiment. Soil microbial phospholipid fatty acid (PLFA) were measured to assess changes in the microbial community composition. The 13C incorporation into microbial biomass and PLFAs was analyzed to trace the microbial utilization of litter-derived DOC. Our results indicated that DOC addition increased the biomass of gram-negative bacteria, gram-positive bacteria, fungi, and actinomycetes, but the microbial community composition manifested a similar trend for both treatment and control soils at the end of incubation. Proportions of added DOC in different depths of soil microbial PLFAs had no significant difference. Moreover, 17:0 cy and 15:0 PLFAs which are described as the bacterial biomarkers had a greater amount of 13C incorporation than other PLFAs for the topsoil, which indicated that 13C-labeled litter-derived DOC was more easily assimilated by some specific bacterial community. Soil microbial biomass and the incorporation of 13C into PLFA reached its maximum around 30 days after DOC addition and then rapidly reduced to the level comparable to control. Overall, this study demonstrated that the incorporation of 13C-labeled litter-derived DOC into PLFA in different depth soil had no significant difference, and the incorporation of 13C by bacteria was higher than other microbial groups.

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“…Fertile soil conditions are directly evident from the abundance of earthworms. High nutrient availability is also indicated by the increased population and activity of soil microbes in the decomposition process of soil organic matter [10]. Therefore, adding biological indicators in the modified method is hoped to ensure a better soil fertility evaluation closer to reality.…”

Section: Introductionmentioning

confidence: 99%

A Modified Soil Fertility Assessment Method Using Earthworm Density and Microbial Biomass C at Various Land Uses in Wonogiri, Indonesia

Dewi¹,

Puspaningrum²,

Tinuntun³

et al. 2022

IJDNE

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Soil fertility is the integrative effect of chemical, physical, and biological soil properties. A modified soil fertility assessment method that adds biological indicators is essential since this indicator is sensitive to dynamic environmental changes and can better represent the reality of soil fertility compared to the conventional method, which only considers chemical soil properties. The research aims to compare the modified and conventional methods in assessing the soil fertility index at various land uses, namely gardens, paddy fields, and moorland, in the Girimarto district, Wonogiri, Indonesia. The collection of soil samples used purposive sampling with three repetitions on 12 land mapping units (LMUs) obtained from an overlay of land use maps, soil type maps, slope gradient maps, and rainfall maps. Soil fertility index (SFI) assessment is based on the Minimum Soil Fertility Indicators (MSFI), which are selected from Pearson correlation, PCA, weight, and score and followed by stepwise regression analysis. The research showed that the modified method represents the soil fertility level better than the conventional one. The soil fertility index on three land uses using the modified method is lower than the conventional method, i.e., between 0.33 to 0.40 and 0.55 to 0.72, respectively. The modified method is more sensitive to dynamic environmental changes due to the contribution of soil biological indicators to the SFI value. Therefore, the biological indicators can represent soil fertility levels closer to reality. Future research needs to validate the modified method in different soil types, land uses, and areas.

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Microbial assimilation dynamics differs but total mineralization from added root and shoot residues is similar in agricultural Alfisols

Cited by 33 publications

References 64 publications

Contrasting response of fungal versus bacterial residue accumulation within soil aggregates to long-term fertilization

Contrasting response of fungal versus bacterial residue accumulation within soil aggregates to long-term fertilization

Effect of Litter-Derived Dissolved Organic Carbon Addition on Forest Soil Microbial Community Composition

A Modified Soil Fertility Assessment Method Using Earthworm Density and Microbial Biomass C at Various Land Uses in Wonogiri, Indonesia

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