Response of surface soil nutrients and organic carbon fractions to tillage erosion vs. water erosion in an agricultural landscape

Zhao, Pengzhi; Li, Lu; Lin, Lin; Zhai, Guoqing; Cruse, Richard M.; Wang, Enheng

doi:10.1002/saj2.20461

Cited by 9 publications

(4 citation statements)

References 81 publications

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“…Rocci et al (2021) did not find clear effects on the partition of SOC among fractions with an increase in precipitation, although they found a negative tendency for POC and a positive tendency on MAOC. The effect of wind erosion on SOC loss will depend on particle size distribution and soil cover, with vulnerable soils losing 3.6 Mg C ha -erosion depending on hillsope position (Zhao et al, 2022). SOC desestabilization and stabilization processes vary along the hillslope with changes in particle size distribution, degree of weathering, and abundance of secondary minerals (Doetterl et al, 2015a).…”

Section: Vulnerability Of Soc Fractions To Climate Changementioning

confidence: 99%

Mapping soil organic carbon fractions for Australia, their stocks and uncertainty

Dobarco

Wadoux

Malone

et al. 2022

Preprint

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Abstract. Soil organic carbon (SOC) is the largest terrestrial carbon pool. SOC is composed of a continuum set of compounds with different chemical composition, origin and susceptibilities to decomposition, that are commonly separated into pools characterised by different responses to anthropogenic and environmental disturbance. Here we map the contribution of three SOC fractions to the total SOC content of Australia’s soils. The three SOC fractions: mineral-associated organic carbon (MAOC), particulate organic carbon (POC) and pyrogenic organic carbon (PyOC), represent SOC composition with distinct turnover rates, chemistry, and pathway formation. Data for MAOC, POC, and PyOC were obtained with near- and mid-infrared spectral models calibrated with measured SOC fractions. We transformed the data using an isometric log-ratio transformation (ilr) to account for the closed compositional nature of SOC fractions. The resulting, back-transformed ilr components were mapped across Australia. SOC fraction stocks for the 0–30 cm were derived with maps of total organic carbon concentration, bulk density, coarse fragments and soil thickness. Mapping was done by quantile regression forest fitted with the ilr transformed data and a large set of environmental variables as predictors. The resulting maps along with the quantified uncertainty show the unique spatial pattern of SOC fractions in Australia. MAOC dominated the total SOC with an average of 59 % ± 17.5 %, whereas 28 % ± 17.5 % was PyOC and 13 % ± 11.1 % was POC. The allocation of TOC into the MAOC fractions increased with depth. SOC vulnerability (i.e., POC/[MAOC + PyOC]) was greater in areas with Mediterranean and temperate climate. TOC and the distribution among fractions were the most influential variables on SOC fraction uncertainty. Further, the diversity of climatic and pedological conditions suggests that different mechanisms will control SOC stabilisation and dynamics across the continent, as shown by the model covariates importance metric. We estimated the total SOC stocks (0–30 cm) to be 12.7 Pg MAOC, 2 Pg POC and 5.1 Pg PyOC, which is consistent with previous estimates. The maps of SOC fractions and their stocks can be used for modelling SOC dynamics and forecasting changes in SOC stocks as response to land use change, management, and climate change.

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Section: Vulnerability Of Soc Fractions To Climate Changementioning

confidence: 99%

Mapping soil organic carbon fractions for Australia, their stocks and uncertainty

Dobarco

Wadoux

Malone

et al. 2022

Preprint

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“…As the largest and most active carbon pool in the terrestrial ecosystem, soil organic carbon (SOC) plays an important role in maintaining soil fertility and serves as an important factor in judging soil quality, accompanied by an important function in maintaining ecosystem productivity and stability [5]. Studies have shown that SOC usually exists in a combined state of coarse organic matter, fine granular organic matter, and soil minerals, and most of the coarse granular organic matter is concentrated in the soil surface layer and taken away relatively easily by runoffs [6]. As the basic unit of soil structure, soil aggregates are formed by the aggregation, flocculation, and cementation of soil particles [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydraulic Erosion on the Spatial Redistribution Characteristics of Soil Aggregates and SOC on Pisha Sandstone Slope

Zhang,

Li,

Wang

et al. 2023

Sustainability

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Under the long-term effects of hydraulic erosion, soil particles and nutrients are continuously lost and enriched in the process of runoff and sediment movement, leading to a change in soil organic carbon (SOC) in different spatial positions on the slope, which is closely related to the carbon balance of the ecosystem. Therefore, the changes in slope erosion intensity and the spatial redistribution characteristics of soil aggregates and SOC under water erosion conditions were quantitatively analyzed by combining field runoff plots with three-dimensional (3D) laser scanning technology. The results showed that: (1) After rainfall, the slope erosion intensity successively declined from the upper to the lower parts of the slope, and the content of soil aggregates in each soil layer changed obviously. The loss of 1–2 mm soil aggregates was the largest in the sedimentary area of the 2–4 cm soil layer, at 0.38 g/kg. The concentration of 0.5–1 mm soil aggregates was the largest in the micro-erosion area of the 2–4 cm soil layer, at 0.36 g/kg. (2) After rainfall, the overall SOC on the slope showed a loss state in the 0–2 cm soil layer and an enrichment state in the 2–4 cm soil layer. Among them, the loss of SOC in the medium erosion area of the 0–1 cm soil layer was the largest, and its content decreased by 57.58%. The enrichment in the 2–4 cm soil layer was the maximum in the micro-eroded area, with a content increase of 79.23%. (3) Before and after rainfall, the SOC of each soil layer was positively correlated with small aggregates, and the correlation gradually tended to be negative with the increase in the particle size of soil aggregates, and the SOC showed a negative correlation with large aggregates (>2 mm).

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“…This facilitates oxidation and hydration of the previously protected SOC, enhancing its mineralization (Six et al, 2008; Wang, Cammeraat, et al, 2014). In addition, erosion can preferentially transport finer soil particles together with clay minerals and reactive mineral oxides to colluvial environments (Berhe et al, 2012; Doetterl, Cornelis, et al, 2015; Zhao et al, 2022), providing colluvial soils with increased potential to physico–chemically protect SOC against mineralization. Topography also exerts a control on soil hydrologic conditions via water flow and therefore interacts with mineral weathering and net primary productivity (NPP) (e.g., Metzen et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Factors controlling SOC stability in colluvial soils under contrasting climate and soil weathering conditions

Zhao

Doetterl

Wang

et al. 2022

European J Soil Science

Self Cite

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Although agricultural colluvial soils are important storage for soil organic carbon (SOC), the mechanisms underlying colluvial (cumulative soils) SOC stability have received little attention so far. In this study, we aim to understand to what extent the main controls on colluvial SOC stability differ from those observed in non-colluvial soils. Paired soil profiles (non-colluvial versus colluvial) were collected from five sites which differ in climate, soil geochemical background and cultivation history. Topsoil (0-10 cm) and subsoil (30-50 cm) were analysed for SOC fractions, mineral composition, potential soil respiration and radiocarbon content. Our analysis showed that for non-colluvial soils, climate, cultivation history and weathering degree have significant effects on potential soil respiration.In contrast, for colluvial soils, the most influential factor for potential soil respiration was the rate of accretion and this was independent of climatic and geochemical context. Furthermore, accretion rates indirectly affected potential soil respiration by interacting with the degree of weathering of deposited soil. This changed the mineral matrix of colluvial soil settings and thereby may enhance soil mineral-related SOC stabilisation mechanisms. Together, these results suggest that the dominant controls on SOC stability in colluvial soils differ from those in non-colluvial soils, and the soil accretion rate is the most important control on colluvial SOC stability in agricultural systems. Highlights• The dominant controls on SOC stability in colluvial and non-colluvial soils were compared.

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Response of surface soil nutrients and organic carbon fractions to tillage erosion vs. water erosion in an agricultural landscape

Cited by 9 publications

References 81 publications

Mapping soil organic carbon fractions for Australia, their stocks and uncertainty

Mapping soil organic carbon fractions for Australia, their stocks and uncertainty

Effects of Hydraulic Erosion on the Spatial Redistribution Characteristics of Soil Aggregates and SOC on Pisha Sandstone Slope

Factors controlling SOC stability in colluvial soils under contrasting climate and soil weathering conditions

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