The formation of large macroaggregates induces soil organic carbon sequestration in short-term cropland restoration in a typical karst area

Xiao, Lumei; Zhang, Wei; Hu, Peilei; Xiao, Dan; Yang, Rong; Ye, Yingying; Wang, Kelin

doi:10.1016/j.scitotenv.2021.149588

Cited by 59 publications

(39 citation statements)

References 88 publications

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“…In our study, soil aggregate stability and SOC stocks in CST and CSG were significantly higher than those in CST (Figure 5). The contribution of the mass proportion of aggregates and aggregate-associated SOC content to SOC stocks was significantly different (Figure 6), which was consistent with previous researches (Xiao et al, 2021). We observed that SOC stock associated with small macro-aggregates contributed the most to SOC stocks, and its increase was mainly due to the increase of SOC content in small macro-aggregates, which was consistent with previous studies (Liao et al, 2016).…”

Section: Linkages Between Soc Stocks and The Mass Proportions And Sta...supporting

confidence: 92%

“…The change of SOC stocks associated with each particle size aggregate was jointly determined by the change of related SOC content in each particle size aggregate (F1) and changes in mass proportion of aggregate (F2). The formula for calculating the contributions of F1 and F2 to SOC stock was as follows (Xiao et al, 2021): the mass proportions of LM and SM in CSG were higher, while those of MI and SC were lower. Additionally, compared with CSN, the MWD and GMD of both CST and CSG were significantly improved, but still far less than that of NS (p < 0.05) (Figure 2b, Figure 2c).…”

Section: Discussionmentioning

confidence: 99%

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The formation of small macro‐aggregates induces soil organic carbon stocks in the restoration process used on cut slopes in alpine regions of China

et al. 2022

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Road construction in mountainous areas of China has formed bare slopes on a large scale, which has aggravated soil erosion and carbon loss, and the restoration processes have changed soil structure and fertility. However, there are few reports regarding the differences of soil aggregate dynamics and SOC sequestration under different restoration process for cut slopes. In this study, three types of cut slopes [cut slope restored naturally (CSN); cut slope restored with three‐dimensional mesh (CST); cut slope restored with galvanized wire mesh (CSG)] and natural slope (NS) in alpine regions were selected as the research objects. SOC stocks and their key driving factors were then analyzed. The results showed that CSG was more beneficial to the formation of macro‐aggregates than CSN and CST. There were significant differences in wet‐sieved aggregate stability under different restoration process, where the sort by strength of stability was NS > CSG > CST > CSN. Aggregate size was a more important factor for SOC stocks than restoration process. The increase of SOC stocks was mainly due to that within small macro‐aggregates. RandomForest analysis revealed that the mass proportion of micro‐aggregates was the most important factor affected SOC stocks, while SOC stocks within large macro‐aggregates and small macro‐aggregates and porosity significantly affected SOC stocks. Partial least squares path modelling analysis found the particle size and stability of aggregates had negative total effects on SOC stocks, and SOC content had positive total effect on that. Overall, for the ecological restoration of cut slope in alpine regions, CSG was most beneficial to increase soil aggregate stability and SOC stocks.

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Section: Linkages Between Soc Stocks and The Mass Proportions And Sta...supporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

The formation of small macro‐aggregates induces soil organic carbon stocks in the restoration process used on cut slopes in alpine regions of China

et al. 2022

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“…As a consequence, afforestation is important to mitigate climate change ( Deng et al, 2014 ), regulate ecosystem restoration ( Deng and Shangguan, 2017 ), and prevent land degradation ( Lan, 2020 ) in terrestrial ecosystems. Numerous studies have explored the effects of afforestation on changes in SOC and its fractions ( Pang et al, 2019 ; Lan, 2020 ; Zhang et al, 2020 ) as well as their interaction with soil aggregate fractions and stability ( Wei et al, 2012 ; Qiu et al, 2015 ; Liu et al, 2020a ; Xiao et al, 2021 ). However, the strength and magnitude of the effects of afforestation on SOC fractions, OC content in aggregates, and soil aggregate stability are still conflicting and have considerable uncertainties.…”

Section: Introductionmentioning

confidence: 99%

“…Afforestation is an effective strategy for SOC stocks in the karst region. Numerous studies have focused on the effects of land-use change/vegetation restoration/afforestation on aggregate formation and SOC sequestration ( Hu and Lan, 2019 ; Lan, 2020 ; Liu et al, 2020a ; Xiao et al, 2021 ; Lan et al, 2022 ), soil aggregate stability ( Lan, 2021 ), and microbial community ( Xue et al, 2017 ; Qiu et al, 2019 ; Zhao et al, 2019 ; Wang et al, 2021 ; Li et al, 2021b ). However, these studies have not investigated the changes in SOC fractions, OC content in aggregates, and soil aggregate stability that are associated with soil bacterial communities.…”

Section: Introductionmentioning

confidence: 99%

The Shift of Soil Bacterial Community After Afforestation Influence Soil Organic Carbon and Aggregate Stability in Karst Region

Lan

Wang

et al. 2022

Front. Microbiol.

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Soil microbes regulate the carbon cycle and affect the formation and stabilization of soil aggregates. However, the interactions between the soil microbial community and soil organic carbon (SOC) fractions, organic carbon (OC) content in aggregates, and soil aggregate stability after afforestation are remain poorly understood. In our study, we investigated SOC fractions in bulk soil, aggregate-associated OC content, soil aggregate stability, and soil bacterial community with high-throughput 16S rRNA sequencing at sites representing natural secondary forest (NF) and managed forest (MF), with cropland (CL) as reference in a degraded karst region of Southwest China. Our results showed that afforestation remarkably increased the SOC fraction and OC content in aggregates, the mean weight diameter (MWD), and the mean geometric diameter (GMD). The most dominant bacterial phyla detected were Acidobacteriota, Actinobacteriota, Proteobacteria, and Chloroflexi across all soils. Afforestation remarkably altered the relative abundances of most of the dominant soil bacteria at the phylum, class, and order levels. Interestingly, such changes in the abundance of soil bacteria taxa had significantly effects on SOC fraction, aggregate-associated OC content, MWD, and MGD. The abundance of dominant bacterial taxa such as Methylomirabilota, Latescibacterota, Methylomirabilia, MB-A2-108, norank_Latescibacterota; Dehalococcoidia, Rokubacteriales, Gaiellales, Microtrichales, norank_c__MB-A2-108, norank_c__norank_p__Latescibacterota, Rhizobiales, and S085 not only remarkably increased but also had significant positive effects on SOC fractions and aggregate-associated OC content after afforestation. Moreover, MWD and MGD were positively correlated with the relative abundance of Methylomirabilota, Methylomirabilia, Rokubacteriales, Latescibacterota, and Rhizobiales. Results indicated the importance of certain soil bacteria for regulating SOC storage and soil aggregate stability. We concluded that afforestation on cropland could alter the abundance of soil bacteria, and these changes modulate the stability of soil aggregates and SOC fractions.

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“…Through the aggregation process, SOC is protected [31,32], and thus different C pools with variable degrees of stabilization are established [33,34]. Indeed, aggregate formation and breakdown and the SOC distribution in the different soil aggregate fractions play a key role in understanding C sequestration and stabilization processes [35,36]. Moreover, the diverse aggregates composition of different sizes class is influenced by human impacts, among which land use modification and management plays a vital role in altering the soil aggregates composition [37].…”

Section: Introductionmentioning

confidence: 99%

Crop Diversification Effects on Soil Aggregation and Aggregate-Associated Carbon and Nitrogen in Short-Term Rainfed Olive Groves under Semiarid Mediterranean Conditions

et al. 2022

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Soil particle aggregation and their associated carbon (C) and nitrogen (N) content can provide valuable diagnostic indicators of changes in soil properties in response to the implementation of different agricultural management practices. In this sense, there is limited knowledge regarding the impact of intercropping on soil organic carbon (SOC) and total nitrogen (TN) pools in aggregates. This study aimed to evaluate the short-term effect (4 years) of three crop diversifications in rainfed olive orchards on soil aggregation, SOC and TN concentration and SOC stocks (SOC-S) under semi-arid Mediterranean conditions. Olive orchards were diversified with Crocus sativus (D-S), Vicia sativa and Avena sativa in rotation (D-O) and Lavandula x intermedia (D-L) and compared with monocropping system (CT). Soil samples were collected at two depths (0–10 and 10–30 cm) and analysed for soil aggregate mass, SOC and TN content in aggregate-size fractions obtained by the wet-sieving method. Changes caused by crop diversifications on SOC-S were also determined. Overall, after 4 years, a reduction in aggregation values was observed. However, D-S increased the macroaggregates (>250 μm) percentage, Mean Weigh Diameter values, and Geometric Mean Value in the 0–10 cm. Across treatments, aggregate-associated C in 0–10 cm was higher in the D-S treatment, while in the 10–30 cm soil layer, the greatest values were found in CT. Regarding the SOC-S, after 4 years, significant losses were recorded under CT management in 0–10 cm (−1.21 Mg ha−1) and 10–30 cm (−0.84 Mg ha−1), while D-O and D-L showed similar values to those obtained at the beginning of the study. The highest increases in SOC-S were found in D-S, with an increase of 5.88% in the 0–10 cm and 14.47% in the 10–30 cm. Our results showed the high potential of the diversified cropping system to increase soil stability and SOC sequestration.

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The formation of large macroaggregates induces soil organic carbon sequestration in short-term cropland restoration in a typical karst area

Cited by 59 publications

References 88 publications

The formation of small macro‐aggregates induces soil organic carbon stocks in the restoration process used on cut slopes in alpine regions of China

The formation of small macro‐aggregates induces soil organic carbon stocks in the restoration process used on cut slopes in alpine regions of China

The Shift of Soil Bacterial Community After Afforestation Influence Soil Organic Carbon and Aggregate Stability in Karst Region

Crop Diversification Effects on Soil Aggregation and Aggregate-Associated Carbon and Nitrogen in Short-Term Rainfed Olive Groves under Semiarid Mediterranean Conditions

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