Root cellulose drives soil fulvic acid carbon sequestration in the grassland restoration process

Bai, Xuejuan; Guo, Zehui; Huang, Yanqun; An, Shaoshan

doi:10.1016/j.catena.2020.104575

Cited by 23 publications

(17 citation statements)

References 70 publications

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“…Grass roots are likely to be contributing to the underground biomass and playing a fundamental role in accumulating carbon in these two systems. A recent study evaluating SOM at different pasture restoration times in China determined that larger root networks increase carbon stocks with increasing depth (Bai, Guo, Huang, & An, 2020). Our results corroborating these recent findings indicate that pasture plays an important role in improving and increasing the quantity and quality of carbon in SOM.…”

Section: Discussionsupporting

confidence: 90%

Chemical characteristics of soil organic matter from integrated agricultural systems in southeastern Brazil

Tadini

Martin‐Neto

Goranov

et al. 2021

European J Soil Science

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Soil organic matter (SOM) plays an essential role in agronomic systems and is of great importance to environmental sustainability and carbon sequestration. This study evaluates the accumulation of carbon in soils from integrated agricultural systems (S) that include crop (C), livestock (L), and forest (F) components (in different combinations: CLFS, LFS and CLS) and an undisturbed native forest (NF) as a reference area. The study sites are part of the Embrapa Pecu aria Sudeste research sta-

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Section: Discussionsupporting

confidence: 90%

Chemical characteristics of soil organic matter from integrated agricultural systems in southeastern Brazil

Tadini

Martin‐Neto

Goranov

et al. 2021

European J Soil Science

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“…The higher root/shoot ratio in the MIX system may partially explain the higher C input in this system. Roots are the largest contributor of C in the soil, mainly due to their higher cellulose content (Bai et al., 2020). Roots also promote greater physical protection of C in microaggregates, particularly in systems with higher N input (Kong & Six, 2010), and there is a relationship between cover crop root growth and soil C accumulation in tropical environments (Rosolem et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Increasing organic matter content increases C sequestration in the soil, which can mitigate the negative effects of the greenhouse effect (Cotrufo et al., 2019). Traditional agricultural practices such as conventional tillage with no cover crop and monoculture (Guimarães et al., 2013) and degraded pastures limit C sequestration (Bai et al., 2020), resulting in soil degradation and reduced agricultural production, particularly in tropical climate environments and sandy soils (Gomes et al., 2017). By contrast, soil management conservation systems such as no‐till favor higher C stocks in the soil (Raphael et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Soil organic carbon stock is improved by cover crops in a tropical sandy soil

et al. 2022

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Soil organic matter plays an important role in soil quality. In sandy soils of tropical regions, high biological activity in the soil accelerates mineralization and limits increases in organic matter content. The objective of this study was to evaluate the total organic C stock and the chemical and physical fractions of organic C in a sandy soil in Presidente Bernardes, São Paulo, Brazil, as a function of cover cropping with different combinations of grasses and legumes between 2015 and 2020. The treatments comprised fallow (control), cultivation of a single grass or intercropping of two grasses, one grass and one legume, or a mixture of two grasses and one legume during the offseason (April-September). Intercropping two grasses increased total dry matter production (shoot and root) by 138% and decreased the C/N ratio by 19% compared with the fallow and legume systems. The organic C stock in the soil was 46% higher in the mixed cover crop system (36.5 Mg ha −1 ) than in the fallow system (25 Mg ha −1 ). Humic acid (0.78-0.82 g kg −1 ) and humin (1.68-1.99 g kg −1 ) were lower in the systems with low dry matter production (fallow and grass + legume). Mineral-associated C content was 114% higher in the mixed cover crop system than in the fallow system. These results show that cover crops can increase C content in all fractions of organic matter in tropical sandy soil, even in a short period of time (5 yr), and that a mix of cover crops is the best option.

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“…However, so far as we know, studies have primarily focused on natural restoration (Bai et al, 2020;Yu et al, 2019), while the impacts of artificial restoration have been mostly overlooked (Baoyin & Li, 2009;Yang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Numerous field studies have linked increased SOC storage to higher above‐ and belowground litter C input following vegetation restoration (Huang et al, 2022; Kalinina et al, 2013). However, so far as we know, studies have primarily focused on natural restoration (Bai et al, 2020; Yu et al, 2019), while the impacts of artificial restoration have been mostly overlooked (Baoyin & Li, 2009; Yang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effects of artificial restoration on vertical distribution of soil carbon storage following revegetation in a semiarid grassland of North China

2022

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Artificial restoration is an important strategy to restore plant communities and soil nutrients in degraded grassland ecosystems. Despite that research has been extensive on the impacts of vegetation restoration on soil carbon storage, little work has been tried to examine the impacts of artificial restoration on the vertical distribution of soil organic carbon (SOC) storage following revegetation in grassland ecosystems.In this paper, the responses of plant species diversity, litter biomass (LB), aboveground biomass (AGB), the relative biomass of three dominant plant species, and the belowground biomass (BGB) were quantified under five different restoration regimes (natural recovery, harrowing, harrowing plus fertilization, harrowing plus irrigation, harrowing plus fertilization and irrigation), to explore the direct and indirect effects of artificial restoration, mediated by changes in the plant properties following revegetation, on SOC storage in Leymus chinensis steppe, North China. We found that artificial restoration greatly facilitated the recovery of Leymus chinensis but lowered the plant diversity. Irrigation treatment, particularly harrowing plus irrigation, was associated with both higher BGB and LB, which had positive effects on SOC storage at the 30-60 cm soil layer when compared with natural restoration. In addition, artificial restoration had positive but not significant effects on SOC storage in the surface soil layer (0-10 cm) mediated directly by changes in BGB, while it exerted negative indirect effects on SOC storage at the 10-30 cm soil layer through low level of plant species diversity. The loss of two dominant species (Stipa krylovii and Cleistogenes squarrosa) could greatly impact SOC storage not only due to lowered species diversity but also the reduced quality of litter input into soil. It is therefore proposed that maintaining high levels of plant species diversity could help sustain higher soil carbon storage through producing high-quality root and litter. Our findings from the 9-year restoration experiment suggested that natural restoration is a sustainable grassland restoration regime to conserve both plant diversity and soil nutrients over short timescales in semi-arid grasslands in North China. In the long term, SOC storage can be

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Root cellulose drives soil fulvic acid carbon sequestration in the grassland restoration process

Cited by 23 publications

References 70 publications

Chemical characteristics of soil organic matter from integrated agricultural systems in southeastern Brazil

Chemical characteristics of soil organic matter from integrated agricultural systems in southeastern Brazil

Soil organic carbon stock is improved by cover crops in a tropical sandy soil

Effects of artificial restoration on vertical distribution of soil carbon storage following revegetation in a semiarid grassland of North China

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