Soil burial reduces decomposition and offsets erosion‐induced soil carbon losses in the Indian Himalaya

Sankar, M.; Hartley, Iain P.; Cressey, Elizabeth L.; Dungait, Jennifer A. J.; Quine, Timothy A.

doi:10.1111/gcb.15987

Cited by 21 publications

(2 citation statements)

References 82 publications

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“…In addition, we found that accretion rate is negatively correlated with SPR (Figure 3), indicating that the colluvial SOC with higher rate of accretion is more stable. This is in line with the notion that the decomposition rate of colluvial SOC can be reduced by a combination of biochemical (recalcitrance of OC constituents), physical (e.g., protected with burial, aggregation) and chemical (e.g., organo-mineral associations) processes (Berhe et al, 2007;Mariappan et al, 2022). On the one hand, the deposited labile SOC in colluvial settings can be rapidly mineralized in-situ (Van Oost et al, 2012;Wang, Van Oost, et al, 2014), resulting in more recalcitrant, remaining SOC fraction becoming eventually buried.…”

Section: Discussionsupporting

confidence: 85%

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

Zhao

Doetterl

Wang

et al. 2022

European J Soil Science

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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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Section: Discussionsupporting

confidence: 85%

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

Zhao

Doetterl

Wang

et al. 2022

European J Soil Science

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“…Consequently, this also diminishes soil microbial activities, soil enzyme activities, and soil respiration (Shen et al 2015), disintegrating soil organic carbon (SOC). On the other hand, the decrease of soil moisture and the aggravation of soil erosion resulting from grazing activities (Kosmalla et al 2022; Mariappan et al 2022) would further restrain soil microbial diversity and activity, which also leads to the loss of grassland soil C pools (Hu et al 2021;Traoré et al 2021). Nonetheless, the detrimental impact is subject to modi cation by precipitation and exhibits variability across distinct climatic regions (arid, semi-arid, and humid regions) (Phukubye et al 2022).…”

Section: Introductionmentioning

confidence: 99%

The SOC of steppe grasslands is more sensitive to grazing than desert-steppe grasslands and is regulated by precipitation outside the growing season in the Mongolian Plateau

Quan,

Tsubo,

Shinoda

et al. 2023

Preprint

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Purpose Soil organic carbon (SOC) predominates organic carbon pools in grassland. To address global climate change, it is essential to explore the soil organic carbon influencing factors and mechanisms. Method s We investigated the soil organic carbon (SOC) in 109 plots along the Mongolian Plateau grassland, which covers the desert-steppe and steppe. Specifically, we analyzed the SOC in the top 10 cm soil layer and its relationships with grazing intensity, climatic factors, soil properties, and vegetation diversity index. Results The average SOC of the desert-steppe (0.3%) was lower than that of the steppe (1.5%). In the desert-steppe, SOC did not vary with grazing intensity. In the steppe, SOC varied significantly with grazing pressure. Significant negative relationships were found between the SOC and growing season temperature (GST) and growing season aridity index (GSR) in the two regions. The responses of SOC to mean annual precipitation (MAP), growing season precipitation (GSP), and outside growing season precipitation (OGSP) in two types of grasslands were different. GST and soil EC were respectively identified as the major positive and negative factors influencing the SOC in the desert-steppe; the OGSP and soil PH were the major positive factors influencing the SOC in the steppe. Conclusion Out results proposed that soils of steppe grasslands have a large carbon sink potential but are more susceptible to grazing. These findings enhance our understanding of the different mechanisms of SOC in different grasslands along the Mongolian Plateau, which are crucial for predicting the effects and consequences of environmental change on carbon sequestration.

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Global Warming Impacts on the Environment in the Last Century

et al. 2022

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Soil burial reduces decomposition and offsets erosion‐induced soil carbon losses in the Indian Himalaya

Cited by 21 publications

References 82 publications

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

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

The SOC of steppe grasslands is more sensitive to grazing than desert-steppe grasslands and is regulated by precipitation outside the growing season in the Mongolian Plateau

Global Warming Impacts on the Environment in the Last Century

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