Impacts of residue quality and N input on aggregate turnover using the combined 13C natural abundance and rare earth oxides as tracers

Rahman, Mohammad Ziaur; Liu, S.; Guo, Zhiguang; Zhang, Z.B.; Peng, Xinhua

doi:10.1016/j.still.2019.01.005

Cited by 38 publications

(15 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The higher proportion of >2‐mm aggregates under the simulated tillage treatment agreed with the mechanism of aggregation proposed by Six et al. (1999): because of the aggregate disruption by cultivation or slaking in the field, the macroaggregates go through a shorter cycle, which then leads to a faster macroaggregate C turnover (Peng et al., 2017; Rahman et al., 2019). This will result in a greater proportion of macroaggregates in conventional tillage than other less intense tillage systems.…”

Section: Discussionsupporting

confidence: 84%

Dynamics of soil aggregate‐associated carbon as influenced by simulated tillage and runoff

Wang

Cao

et al. 2022

Soil Science Soc of Amer J

View full text Add to dashboard Cite

Tillage practices and water erosion are the most important anthropogenic and natural processes, respectively, driving soil organic C turnover in agricultural land. The aim of this study was to explore the responses of soil organic C (SOC) turnover to tillage and runoff by comparing the variation of soil aggregate-associated organic C (AOC) and intra-aggregate particulate organic C (iPOC) under simulated tillage and runoff conditions. Soil samples were collected from a native vegetation land with no cultivation history in the Mollisol region of Northeast China. After a series of simulated tillage (ST) and simulated runoff (SR) treatments, the samples were incubated for 30 d and then separated through 2-, 1-, 0.25-, and 0.053-mm sieves by wet-sieving to obtain different aggregate size fractions. Each aggregate fraction was subsequently shaken for 18 h in 0.5% hexametaphosphate to get different intra-aggregate particle size fractions. The proportion of the fractions and their AOC and iPOC were determined. The ST treatment promoted the reaggregation of macroaggregates (>2 mm) by accelerating the turnover of their coarse iPOC (0.25-2 mm), leading to a lower concentration of AOC. Runoff transformed larger aggregates (>0.25 mm) to smaller particles (<0.25 mm) without catalyzing C turnover. Fine iPOC (0.053-0.25 mm) could serve as an indicator for AOC (>1 mm) dynamics, especially associated with tillage operations. Our findings highlight the different influences of tillage and runoff, and the negative effect of tillage on SOC dynamics.

show abstract

Section: Discussionsupporting

confidence: 84%

Dynamics of soil aggregate‐associated carbon as influenced by simulated tillage and runoff

Wang

Cao

et al. 2022

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…The understanding of aggregate turnover pathways, including both formation and breakdown rates, is still limited primarily due to methodological difficulties (De Gryze et al, 2006;Peng et al, 2017;Morris et al, 2019;Rahman et al, 2019). Using REO labeling, dry and wet sieving aggregate fractions were found to exhibit different turnover pathways, which are consistent with the trends reported by a few empirical studies (Peng et al, 2017;Wang et al, 2020).…”

Section: Aggregate Turnover Pathways 350supporting

confidence: 74%

Effect of rare earth oxide labeling and sieving methods on aggregate turnover and carbon dynamics

Wang

Asano

Jiang

et al. 2022

Preprint

View full text Add to dashboard Cite

Abstract. Rare earth element oxides (REOs) are effective tracers to investigate soil aggregate dynamics and are also useful to quantify the interaction between C and aggregate dynamics. Although the effect of the REO labeling process on soil aggregates has been considerably investigated, its effect on soil organic carbon remains unknown. The objectives of this study were to (1) determine the effect of the labeling process on soil organic matter, (2) verify the feasibility of using REOs as tracers for investigating Andisols dry and wet sieving aggregate turnover, and (3) analyze the relationship between organic matter and aggregate dynamics during 28 days of incubation. The results showed that the soil organic carbon pool was interfered with by the labeling process, particularly with dissolved organic carbon (DOC), microbial biomass carbon (MBC), and free particulate organic matter (fPOM). Furthermore, the degree of interference was related to the soil sieving method, with the wet sieving process exerting a more significant effect on MBC and fPOM, and the dry sieving process biasing toward DOC. The close 1:1 relationship between measured aggregates and model predictions revealed that REOs are effective tracers for investigating both dry and wet sieving aggregate dynamics in Andisols. Regarding the relationship between organic matter and aggregate dynamics, dry sieving macroaggregate breakdown and restabilization were the largest, shortly appearing in the first incubation week and slowing down thereafter. This trend was also applicable for each dry sieving fraction turnover rate, which correlated significantly with fPOM (0.97, 0.99, and 0.997, P < 0.05). The turnover of wet sieving aggregates also occurred primarily in the first 7 days, but no significant relationship was observed between wet sieving aggregates and soil organic matter dynamics (P > 0.05), which was attributed to numerous wet–dry cycles during the labeling process. The results of the current study indicate that dry sieving aggregates fit better with the quantification of the relationship between aggregates and organic matter dynamics when soil organic matter dynamics were quantified using soil organic carbon pools.

show abstract

“…Each treatment was triplicate. The amount of 1% on dry weight has been applied in a set of previous investigations (Rahman et al, 2019;Liu et al, 2021;Halder et al 2022), hence these three types of residues were incorporated into REO-labelled soils at the same amount. Straw was homogeneously mixed with REO-labelled soil in a plastic packaging bag to avoid aggregate breakdown.…”

Section: Experimental Designmentioning

confidence: 99%

“…Utilizing the rare earth oxides (REOs) labelling method makes it possible to separate soil aggregate formation and breakdown processes (Peng et al, 2017). Based on it, Peng et al (2017) and Rahman et al (2019) revealed that new C accumulated more notably but decomposed faster in macroaggregates than in microaggregates, and they also observed a significant positive relationship between the 13 C concentration in aggregates and the aggregate turnover rate. However, the dynamics of C sequestration coupled with soil aggregate turnover remain unclear because of the limited data available.…”

Section: Introductionmentioning

confidence: 99%

“…Clay particles favour increasingly stronger organic C-clay interactions due to their larger specific surface areas (von Lützow et al, 2006), hence, a high correlation between the clay content and aggregate stability or SOC content has been widely reported (Adhikari and Bhattacharyya, 2015;Blanco-Moure et al, 2016). In addition, residue decomposition processes, which are essential to soil aggregate formation and microbial biomass carbon (MBC), have caused great concerns (Rahman et al, 2017, Rahman et al, 2019. The chemical compositions of added residues control the microbial community response and further mediate the decomposition and incorporation of C in stable aggregates (Almagro et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integrated aggregate turnover and soil organic carbon sequestration using rare earth oxides and 13C isotope as dual tracers

et al. 2023

Self Cite

View full text Add to dashboard Cite

Impacts of residue quality and N input on aggregate turnover using the combined 13C natural abundance and rare earth oxides as tracers

Cited by 38 publications

References 34 publications

Dynamics of soil aggregate‐associated carbon as influenced by simulated tillage and runoff

Dynamics of soil aggregate‐associated carbon as influenced by simulated tillage and runoff

Effect of rare earth oxide labeling and sieving methods on aggregate turnover and carbon dynamics

Integrated aggregate turnover and soil organic carbon sequestration using rare earth oxides and 13C isotope as dual tracers

Contact Info

Product

Resources

About