Long term impact of different tillage systems on carbon pools and stocks, soil bulk density, aggregation and nutrients: A field meta-analysis

Țopa, Denis; Cara, Irina Gabriela; Jităreanu, G.

doi:10.1016/j.catena.2020.105102

Cited by 87 publications

(36 citation statements)

References 49 publications

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“…Responses of nine indicators (soil properties and crop yield) to NT, along with their relationships to soil pH, were assessed in the metaanalysis presented herein (Figures 6-8; Table S3). As reported by previous studies of meta-analysis, NT significantly enhances the concentration of SOC, TN, and soil nutrients (N, P, K), especially in the topsoil layer (Topa et al, 2021;Zhao et al, 2017). Similar results are observed in the meta-analysis presented herein.…”

Section: Mechanism Of Changing Soil Ph and Influences Under No-tillsupporting

confidence: 92%

Responses of soil pH to no‐till and the factors affecting it: A global meta‐analysis

Zhao

Liu

et al. 2021

Global Change Biology

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Section: Mechanism Of Changing Soil Ph and Influences Under No-tillsupporting

confidence: 92%

Responses of soil pH to no‐till and the factors affecting it: A global meta‐analysis

Zhao

Liu

et al. 2021

Global Change Biology

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“…This discrepancy was most likely due to the lower proportion of large/small macro‐aggregates, as tillage tended to disturb macro‐aggregates and form more microaggregates in sorghum and paddy soils. The SOC associated with macroaggregates was more labile and easily decomposed by microorganisms than those associated with microaggregates (Topa et al, 2021). Therefore, the results indicated that a fast aggregate turnover rate as affected by tillage in sorghum and paddy field soils could increase the slow and passive C‐pool, which was important for improving SOC sequestration in saline‐sodic soils in the long run.…”

Section: Discussionmentioning

confidence: 99%

Aggregate stability and organic carbon stock under different land uses integrally regulated by binding agents and chemical properties in saline‐sodic soils

et al. 2021

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Aggregate stability and soil organic carbon (SOC) are critical for maintaining soil structure and preserving soil productivity. Land use substantially affects the process of soil aggregate stabilization and SOC sequestration, yet the detailed mechanisms have not been well studied in degraded soil ecosystems (e.g., saline-sodic soils).Therefore, to interpret the effects of land-use changes on soil aggregate stability and SOC stocks in saline-sodic soils, soils were sampled from four major land-use areas (degraded meadow, artificial forest, sorghum field, and paddy field) in Northeast China. The results showed that artificial forest soils exhibited the greatest proportion of water-stable aggregate (>250 μm) in 0-10 and 10-20 cm layers than sorghum and paddy field, which was mainly due to the absence of tillage disturbance. The highest SOC stock (59.79 Mg ha À1 ) was observed in paddy soils, indicating its greater SOC sequestration potential than those of other land uses. The variance partition analysis (VPA) revealed that soil parameters resulted in 85.1% variation regarding soil aggregate stability, in which the chemical characteristics (i.e., pH, EC, exchangeable Na + , and exchangeable sodium percentage) contributed 23.1%, binding agents (SOC, exchangeable Ca 2+ , and poorly crystalline Fe/Al oxides) contributed 20.6%, and their interactions contributed 39.5%. Binding agents directly participated in soil aggregation processes by forming clay-polyvalent metal complexes, while the chemical characteristics indirectly promoted soil aggregation via increasing various binding agents.Understanding the interactions between binding agents and clay are important for promoting soil aggregate stabilization in saline-sodic soil.

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“…SOC is primarily derived from plant litter debris through partial degradation or preservation [4]. Mounting evidence has shown that litter input has complex effects on the dynamic balance of SOC [5][6][7]. For example, short-term increases in litter inputs could enhance SOC stocks and C fluxes [8,9].…”

Section: Introductionmentioning

confidence: 99%

Decreased Soil Organic Carbon under Litter Input in Three Subalpine Forests

Chen

Shen

Tan

et al. 2021

Forests

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Soil organic carbon (SOC) is the largest terrestrial organic carbon pool. Plant litter is an important source of SOC, but the knowledge gap between SOC fractions and plant litter input remains inconsistent. Here, a litter input control experiment was conducted at three subalpine forest types (coniferous forest, mixed forest, and broadleaved forest). We assessed the variations of total organic C, active organic C (easily oxidizable C, labile organic C), recalcitrant organic C, and microbial biomass C under litter input or removal. The results showed that soil total organic C decreased greatly under litter input. It was mainly caused by the change of easily oxidizable C and labile C, while the influence of recalcitrant C was small. At the same time, this effect varied among different forest types. Among them, the effect of litter input on SOC was weak and slow in the coniferous forest with low-quality litter input, while a quick effect was observed in the mixed and broadleaved forests with high-quality litter input. Microbial biomass C declined under litter input in most cases, and its variation was strongly controlled by soil temperature and freeze-thaw events. Overall, our results provide new evidence that forest type would strongly control SOC dynamics, in concert with litter quality shifts, with potential consequences for long-term C sequestration. We highlighted that litter input could reduce microbial biomass carbon which might limit the native SOC decomposition, but the loss of active C ultimately changed the SOC in the subalpine forests. It suggested that the interaction of multiple mechanisms should be considered in the study of SOC in this region.

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Long term impact of different tillage systems on carbon pools and stocks, soil bulk density, aggregation and nutrients: A field meta-analysis

Cited by 87 publications

References 49 publications

Responses of soil pH to no‐till and the factors affecting it: A global meta‐analysis

Responses of soil pH to no‐till and the factors affecting it: A global meta‐analysis

Aggregate stability and organic carbon stock under different land uses integrally regulated by binding agents and chemical properties in saline‐sodic soils

Decreased Soil Organic Carbon under Litter Input in Three Subalpine Forests

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