Carbon sequestration in aggregates from native and cultivated soils as affected by soil stoichiometry

Fan, Ruqin; Du, Jun; Liang, Aizhen; Lou, Jun; Li, Jiangye

doi:10.1007/s00374-020-01489-2

Cited by 26 publications

(21 citation statements)

References 67 publications

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“…One-way ANOVA with the least signi cant difference (LSD) test was conducted to identify the signi cant differences in the SOC and SON concentrations of bulk soils, the proportions of different-sized aggregates, the aggregate-SOC and SON concentrations in bulk soils, soil Ca concentrations, soil Ca/Al ratios, the δ 15 N values of SON in bulk soils and different-sized aggregates, and the EF values at the three stages following post-agricultural restoration, at the signi cance level of P < 0.05. Linear and non-linear regression analyses were used to determine the variations of foliar N concentrations, δ 15 N values, and C/N ratios following post-agricultural restoration. Based on the linear and non-linear regression analyses, the equations of best-t lines were determined, and the coe cients of r and P-value showed the tting degree and validity, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…SOC sequestration mainly depends on the accumulation of the stable SOC which is not easily mineralized in the soil environment (Fan et al 2020). Thus, identifying SOC stabilization mechanism is key to understanding the SOC sequestration potential following post-agricultural restoration (Li et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The three mechanisms of SOC stabilization have been widely proposed (Sollins et al 1996 3) physical stabilization via the protection of soil aggregates. Generally, the primary SOC stabilization approach differs between sites due to the discrepancies in land use management types and soil physicochemical properties (Fan et al 2020). Thus, it is necessary to con rm the main SOC stabilization approach following post-agricultural restoration at a speci c site.…”

Section: Introductionmentioning

confidence: 99%

“…The 15 N stable isotope ratio (δ 15 N) has been widely considered to evaluate N processes and sources, including N fertilizer application (Choi et al 2017) (Hogberg 1997). Thus, the δ 15 N composition of crops is signi cantly affected by the 15 N-abundance of synthetic fertilizer (mean δ 15 N: 0.3 ± 0.2‰, Choi et al 2017) (Six et al 1998(Six et al , 2000(Six et al , 2002. According to these ndings, we hypothesized that soil aggregates and Ca are the major factors determining SOC sequestration during post-agricultural restoration in the karst region (H1…”

Section: Introductionmentioning

confidence: 99%

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Increasing SOC sequestration and closing N cycle during post-agricultural restoration in karst region, Southwest China

Liu

Han

Zhang

2021

Preprint

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Purpose Post-agricultural restoration affects soil organic carbon (SOC) sequestration and ecosystem nitrogen (N) cycle. However, the control mechanism of SOC sequestration and alteration of ecosystem N status following post-agricultural restoration are not well understood in karst regions. Methods Croplands, abandoned croplands, and native vegetation forests were selected to represent three stages following post-agricultural restoration using a space for time substitution approach in a karst critical zone in Guizhou province, Southwest China. The variations of soil aggregate associated SOC and relationships between soil Ca and SOC were analyzed to identify SOC sequestration potential. Foliar δ15N composition and soil to plant 15N enrichment factor (EF = δ15Nlitter − δ15Nsoil) were analyzed to determine ecosystem N status. Results Macro-aggregate proportions and their SOC concentrations significantly increased following post-agricultural restoration. Soil Ca concentrations non-linearly increased with increasing SOC concentrations of bulk soils and aggregates. Foliar δ15N values and EF values significantly decreased following post-agricultural restoration, mainly attributed to the increasing plant uptake of 15N-depleted inorganic N, which was produced from soil organic nitrogen (SON) mineralization and nitrification. During post-agricultural restoration, the increasing plant biomass and slow SON mineralization led to more inorganic N uptake and less N loss, i.e., a more closed N cycle. Conclusion Soil aggregates and Ca play important roles in promoting SOC sequestration, and ecosystem N cycles are towards closed during post-agricultural restoration in the karst ecosystem.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Increasing SOC sequestration and closing N cycle during post-agricultural restoration in karst region, Southwest China

Liu

Han

Zhang

2021

Preprint

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“…Microbial OS mineralisation induced by microbial C demand could add to the existing plant S supply. After heterotrophs absorb the substrate, the N:C and S:C ratios may exceed certain thresholds leading to net N and S mineralisation, and extra N and S can be released as SO 4 2− and NH 4 + to maintain microbial biomass stoichiometry (Fan et al 2020;Manzoni et al 2017;Mooshammer et al 2014;Wei et al 2020). At 6 h and 24 h, 35 S MB increased, and the sulphate released was reutilised by soil microorganisms.…”

Section: Soil Cysteine-derived S N and C Cyclingmentioning

confidence: 99%

Competition for S-containing amino acids between rhizosphere microorganisms and plant roots: the role of cysteine in plant S acquisition

Hill

Chadwick

et al. 2021

Biol Fertil Soils

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Plant S deficiency is common, but the role of S-containing amino acids such as cysteine in plant S uptake is unknown. We applied 14C-, 35S-, 13C-, and 15N-labelled cysteine to wheat and oilseed rape rhizospheres and traced the plants’ elemental uptake. Both plants absorbed 0.37–0.81% of intact cysteine after 6 h with no further increase after 24 h. They absorbed 1.6–11.5% 35S and 12.3–7.6% 15N from cysteine after 24 h and utilised SO42− as their main S source (75.5–86.4%). Added and naturally occurring cysteine-S contributed 5.6 and 1.1% of total S uptake by wheat and oilseed rape, respectively. Cysteine and inorganic S derived from cysteine contributed 24.5 and 13.6% of uptake for wheat and oilseed rape, respectively, after 24 h. Oilseed rape absorbed ~10-fold more S from cysteine and SO42− than did wheat. The highest absorption of free cysteine should be in the organic-rich soil patches. Soil microorganisms rapidly decomposed cysteine (t1/2 = 1.37 h), and roots absorbed mineralised inorganic N and S. After 15 min, 11.7–14.3% of the 35S-cysteine was retained in the microbial biomass, while 30.2–36.7% of the SO42− was released, suggesting that rapid microbial S immobilisation occurs after cysteine addition. Plants acquire N and S from cysteine via unidirectional soil-to-root nutrient flow, and cysteine is an important S source for plants.

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Microbial functional genes within soil aggregates drive organic carbon mineralization under contrasting tillage practices

Wang

Zhang

Nangia³

et al. 2023

Land Degrad Dev

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Soil organic carbon (SOC) transformation is susceptible to tillage practices. Conservation tillage is known to optimize soil structure, improve microbial community diversity and increase SOC storage. However, how soil aggregate distribution and microbial community structure and function within aggregates affect SOC transformation under long‐term conservation tillage remains unclear. In this study, SOC mineralization dynamics were studied in situ and under laboratory conditions to examine the mechanisms by which C functional genes within soil aggregates of different sizes (i.e., mega‐, macro‐, and micro‐aggregates) influence SOC mineralization under long‐term tillage (i.e., zero, chisel, and plow tillage) in a dryland. The results indicated that in the winter wheat and summer maize rotation cropping system, SOC‐derived CO2‐C emissions were 143.99 and 133.29 g CO2‐C m−2 h−1 lower under chisel and zero tillage than that under plow tillage, respectively. Moreover, after 180 days of laboratory incubation, SOC mineralization in micro‐ and macro‐aggregates was 1.98 and 1.63 mg CO2‐C g−1 d−1 higher than that in mega‐aggregates, respectively. The aggregate‐associated differential modules of bacterial co‐occurring networks may be directly governed by bacterial community diversity and composition, which might play critical roles in driving SOC mineralization in response to different tillage intensities. Moreover, aggregate‐associated functional genes involved in labile and recalcitrant C compositions, which were determined by shotgun metagenomic sequencing, were associated with SOC mineralization and were significantly affected by the legacy effect of tillage intensity and aggregate size. Particularly, partial least squares path modeling revealed that genes involved in simple sugar metabolism exerted significantly positive effects on SOC mineralization, except for the effects of tillage intensity and aggregate size. Overall, this study showed that decreased abundances of labile C decomposition‐related functional genes within aggregates and community composition changes, as elucidated by the differences in bacterial network modules, under conservation tillage inhibit SOC mineralization. These findings may help in the development of adaptive soil tillage strategies for reducing carbon emissions in agroecosystems.

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Carbon sequestration in aggregates from native and cultivated soils as affected by soil stoichiometry

Cited by 26 publications

References 67 publications

Increasing SOC sequestration and closing N cycle during post-agricultural restoration in karst region, Southwest China

Increasing SOC sequestration and closing N cycle during post-agricultural restoration in karst region, Southwest China

Competition for S-containing amino acids between rhizosphere microorganisms and plant roots: the role of cysteine in plant S acquisition

Microbial functional genes within soil aggregates drive organic carbon mineralization under contrasting tillage practices

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