Zones of influence for soil organic matter dynamics: A conceptual framework for data and models

Cagnarini, Claudia; Blyth, Eleanor; Emmett, Bridget; Evans, C. D.; Griffiths, Robert I.; Keith, Aidan M.; Jones, Laurence; Lebron, Inma; McNamara, Niall P.; Puissant, Jérémy; Reinsch, Sabine; Robinson, David A.; Rowe, E.C.; Thomas, Amy; Smart, Simon M.; Whitaker, Jeanette; Cosby, B. J.

doi:10.1111/gcb.14787

Cited by 20 publications

(18 citation statements)

References 115 publications

(127 reference statements)

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“…Under low-to-moderate vegetation biomass cover (<5 kg m −2 vegetation water content), the L-band (1.4 GHz) Tb observations are especially sensitive to the dielectric properties, including moisture levels, within the surface soil layer (Entekhabi et al, 2010), which is congruent with the 0-to 5-cm surface soil layer depth of the SMAP L4SM product. This is also consistent with the L4C calibration against flux tower observations, as the surface soil layer generally encompasses more recent and labile SOC, which generally contributes the largest component of the soil RH flux (Bond-Lamberty et al, 2004) and is more sensitive to seasonal and interannual climate variability (Cagnarini et al, 2019;Chen et al, 2013) relative to deeper soil layers. The accuracy of L4SM soil moisture estimates is lower in areas of dense vegetation and areas where precipitation gauge measurements are sparse , due to uncertainty in the Tb assimilation and the Catchment land model, respectively.…”

Section: Data Sources 211 Smap L4c Surface Socsupporting

confidence: 85%

“…The role of microbial biomass in the stabilization and transformation of SOC is the most conspicuous missing piece of these models (Wieder et al, 2013), and, despite increasing global data availability (Crowther et al, 2019), it is perhaps the most difficult to parameterize for operational, global models. The emerging view of SOC dynamics emphasizes not just microbial functions but also substrate availability (Lehmann & Kleber, 2015; Luo et al, 2017) and the dynamic protection of mineral SOC that is partially dependent on soil texture and composition (Cagnarini et al, 2019). The quality and type of litter inputs as a function of the vegetation community is another missing piece (Hu et al, 2018) that affects the microbial influence on SOC dynamics but may be parameterized more easily than microbial functions in future models.…”

Section: Discussionmentioning

confidence: 99%

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Satellite Monitoring of Global Surface Soil Organic Carbon Dynamics Using the SMAP Level 4 Carbon Product

et al. 2020

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Soil organic carbon (SOC) is an important metric of soil health and the terrestrial carbon balance. Short‐term climate variations affect SOC through changes in temperature and moisture, which control vegetation growth and soil decomposition. We evaluated a satellite data‐driven carbon model, operating under the NASA Soil Moisture Active‐Passive (SMAP) mission, as a means of monitoring global surface SOC dynamics. The SMAP Level 4 Carbon (L4C) product estimates a daily global carbon budget including surface (0‐ to 5‐cm depth) SOC. We found that the L4C mean latitudinal SOC distribution is generally consistent with alternative assessments from static soil inventory records and dynamic global vegetation models (r ≥ 0.89). Within forest systems, based on inventory data, L4C SOC is most similar in magnitude to litterfall but is correlated with coarse woody debris ( r=0.86) and total SOC ( r=0.81). L4C SOC is sensitive to seasonal and annual climate variability, with mean residence times that range from 1.5 years in the wet tropics to 17 years in the cold tundra. Incorporating soil moisture retrievals from the SMAP L‐band (1.4 GHz) microwave radiometer within the L4C algorithm provides enhanced soil moisture sensitivity under low‐to‐moderate vegetation cover (<5 kg m−2 vegetation water content). The L‐band soil moisture had the greatest impact on the L4C carbon budget in semiarid regions, which span almost 60% of the globe and account for substantial variability in the terrestrial carbon sink. The L4C operational product enables prognostic investigations into effects of recent climate trends and anomalies (e.g., droughts and pluvials) on shallow soil carbon dynamics.

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Section: Data Sources 211 Smap L4c Surface Socsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Satellite Monitoring of Global Surface Soil Organic Carbon Dynamics Using the SMAP Level 4 Carbon Product

et al. 2020

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“…New hypotheses based on these findings posit that rapid cycling can still result in long-term SOM persistence, with mineral interactions temporarily slowing the flow of SOM rather than conferring permanent protection (Cagnarini et al, 2019). Empirical support for this hypothesis comes from recent high-resolution mass spectrometry work demonstrating that as dissolved organic C moves downward through the soil profile, its composition shifts toward mid-weight, saturated molecules with a high degradation index (Roth et al, 2019).…”

Section: Toward Dynamic Stabilitymentioning

confidence: 99%

Dynamic Stability of Soil Carbon: Reassessing the “Permanence” of Soil Carbon Sequestration

Dynarski

Bossio²,

Scow

2020

Front. Environ. Sci.

126

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“…Among these, topography is one of the five major soil surface formation factors (Jenny, 1994). Topography affects soil erosion and thus affects SOC's spatial distribution either directly or indirectly (Sun et al, 2010;Rodrigo-Comino et al, 2016Cagnarini et al, 2019;Cerdà and Rodrigo-Comino, 2020). Several studies have demonstrated the effects of topography and soil erosion on SOC's distribution (Beguería et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Vegetation Restoration Alleviated the Soil Surface Organic Carbon Redistribution in the Hillslope Scale on the Loess Plateau, China

Liang

Zha

et al. 2021

Front. Environ. Sci.

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The redistribution of soil organic carbon (SOC) in response to soil erosion along the loess slope, China, plays an important role in understanding the mechanisms that underlie SOC’s spatial distribution and turnover. Consequently, SOC redistribution is key to understanding the global carbon cycle. Vegetation restoration has been identified as an effective method to alleviate soil erosion on the Loess Plateau; however, little research has addressed vegetation restoration’s effect on the SOC redistribution processes, particularly SOC’s spatial distribution and stability. This study quantified the SOC stock and pool distribution on slopes along geomorphic gradients in naturally regenerating forests (NF) and an artificial black locust plantation (BP) and used a corn field as a control (CK). The following results were obtained: 1) vegetation restoration, particularly NF, slowed the migration of SOC and reduced the heterogeneity of its distribution effectively. The topsoil SOC ratios of the sedimentary area to the stable area were 109%, 143%, and 210% for NF, BP, and CK, respectively; 2) during migration, vegetation restoration decreased the loss of labile organic carbon by alleviating the loss of dissolved organic carbon (DOC) and easily oxidized organic carbon (EOC). The DOC/SOC in the BP and NF increased significantly and was 13.14 and 17.57 times higher, respectively, than that in the CK (p < 0.05), while the EOC/SOC in the BP and NF was slightly higher than that in the CK. A relevant schematic diagram of SOC cycle patterns and redistribution along the loess slope was drawn under vegetation restoration. The results suggest that vegetation restoration in the loess slope, NF in particular, is an effective means to alleviate the redistribution and spatial heterogeneity of SOC and reduce soil erosion.

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Zones of influence for soil organic matter dynamics: A conceptual framework for data and models

Cited by 20 publications

References 115 publications

Satellite Monitoring of Global Surface Soil Organic Carbon Dynamics Using the SMAP Level 4 Carbon Product

Satellite Monitoring of Global Surface Soil Organic Carbon Dynamics Using the SMAP Level 4 Carbon Product

Dynamic Stability of Soil Carbon: Reassessing the “Permanence” of Soil Carbon Sequestration

Vegetation Restoration Alleviated the Soil Surface Organic Carbon Redistribution in the Hillslope Scale on the Loess Plateau, China

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