Hydraulic mechanisms of the uneven enrichment of soil organic carbon in sediments during rain-induced overland flow

Liu, Lin; Li, Zhongwu; Jiao, Panpan

doi:10.1371/journal.pone.0262865

Cited by 2 publications

(1 citation statement)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For different time scales, the considered factors for SOC prediction are also different. On short rainfall time scales, soil erosion eliminates the physical protection of OCs and enriches the OCs protected by chemical combinations in sediments, thereby allowing them to be deposited at the deposition location; these are all decided by rain‐induced runoff hydraulic factors (Liu et al, 2022; Zhang et al, 2020). At long time scales, changes in soil texture and material composition caused by soil erosion should be considered in related SOC models (Percival et al, 2000; Torn et al, 1997).…”

Section: Soc Prediction Under Water Erosionmentioning

confidence: 99%

Is soil an organic carbon sink or source upon erosion, transport and deposition?

Liu

2023

European J Soil Science

Self Cite

View full text Add to dashboard Cite

Soil may be a carbon source or sink under the effect of sediment and soil organic carbon (SOC) erosion, transport and deposition. Partial SOC processes to determine whether soil subjected to water erosion is a carbon sink or source have not been clarified but are essential for increasing and predicting SOC storage. In this review, the associations between SOC mineralization, stability and stock at erosion sites, in transported sediments and at deposition sites are clarified. An overview is given for possible determination standards that define soil carbon sinks and sources. Methods for enhancing SOC sequestration and suggestions for improving SOC prediction are also presented. Particle transport is an important intermediate process that determines the material base for SOC stability and sequestration in each erosion and deposition element. When subject to water erosion, a high probability of SOC physical stabilization and a thick soil layer are essential for soil to function as a SOC sink. Sediment transport weakens SOC physical protection in eroded areas but can promote aggregation factors at deposition sites in some cases while increasing the depth of SOC in the soil. In this circumstance, a good soil environment for plant growth facilitates the occurrence of carbon sinks. A concept for critical erosion intensity is proposed to understand SOC sink determination; the concept is presented as the volume of soil erosion per square kilometre (m3 km−2) for which the maximum reduction in vegetation cover or plant biomass still permits plants to provide enough organic matter to compensate for erosion‐induced SOC loss. If erosion intensity is higher than critical erosion intensity at the erosion site, soil degradation is obvious, and soil is presented as an OC source, and vice versa. Finally, the SOC burial method for increasing the soil carbon storage amounts in regions with thick soil layers is presented to explore the SOC sequestration potential in deep soil. The factors considered for SOC prediction should vary with research scale. We hope our review will have direct implications for the modelling of SOC dynamics under water erosion on both slopes and at large scales. Highlights Changes in soil texture and soil thickness greatly affect the amount of SOC storage at erosion and deposition sites. Selective transport of soil materials or chemical elements promotes soil aggregation. Possible standards that define soil carbon sinks and sources and suggestions for improving SOC prediction are presented. SOC burial may be a good method for increasing C storage amounts in regions with thick layers of fine soil.

show abstract

Section: Soc Prediction Under Water Erosionmentioning

confidence: 99%

Is soil an organic carbon sink or source upon erosion, transport and deposition?

Liu

2023

European J Soil Science

Self Cite

View full text Add to dashboard Cite

show abstract

Effects of Rainfall Variability and Land Cover Type on Soil Organic Carbon Loss in a Hilly Red Soil Region of Southern China

Chang,

Xiao,

Liao

et al. 2024

Agronomy

View full text Add to dashboard Cite

Rainfall intensity (RI) and land cover type are two important factors that affect soil erosion and thus the transfer and loss of soil organic carbon (SOC). However, the in situ quantitative monitoring of SOC loss under natural rainfall and various land cover types restored on eroded lands has not been thoroughly examined. In order to further study the effects of rainfall changes and vegetation types on SOC loss in the red soil region of Southern China, the Jiangxi Eco-Science Park of Soil and Water Conservation in De’an County, Jiangxi Province, was taken as the research object. Considering natural rainfall and based on the long-term field in situ monitoring of rainfall and runoff and sediment data, we studied the effects of three land cover types (bare land, orchards, and grass cover) on surface runoff, sediment production, and SOC loss in relation to 1 hour of RI during natural rainfall in the red soil region of Southern China during rainy seasons of 2020 and 2021 (March to August). Compared with bare land plots, the orchard and grass cover plots had surface runoff reductions of 67% and 98%, respectively, and sediment reductions of 79% and 99% over the two rainy seasons, respectively. With an increasing RI over 1 hour, total SOC loss increased for each of the three land cover types. More SOC loss was associated with sediments, and the enrichment ratio of SOC in the sediments (ERoc) decreased significantly. The ERoc values decreased in the following order: bare land (1.23) > orchard (1.08) > grass cover (0.81). Bare land exhibited the highest proportion of SOC associated with sediment in the total SOC loss (Ps), at 68.69%, followed by the orchard plots, at 55.02%, and then the grass cover plots at 49.24%. With the transfer of land cover type from bare land to orchard and to grass cover (decreased soil loss intensity, SLI), more SOC was lost associated with runoff in the form of dissolved organic carbon (DOC); the values of ERoc and organic carbon loss intensity (CLI) also decreased significantly. These findings are crucial to improving our understanding of the regulatory mechanisms of rainfall changes and land cover types on SOC loss during soil erosion.

show abstract

Hydraulic mechanisms of the uneven enrichment of soil organic carbon in sediments during rain-induced overland flow

Cited by 2 publications

References 52 publications

Is soil an organic carbon sink or source upon erosion, transport and deposition?

Is soil an organic carbon sink or source upon erosion, transport and deposition?

Effects of Rainfall Variability and Land Cover Type on Soil Organic Carbon Loss in a Hilly Red Soil Region of Southern China

Contact Info

Product

Resources

About