Aggregate stability and size distribution regulate rainsplash erosion: Evidence from a humid tropical soil under different land-use regimes

Zhu, Xiai; Liu, Wenjie; Xia, Yuan; Chen, Chunfeng; Zhu, Kai; Zhang, Wanjun; Yang, Bin

doi:10.1016/j.geoderma.2022.115880

Cited by 24 publications

(3 citation statements)

References 73 publications

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“…It was observed that the presence of bedrock fragments by long-term tillage has a significant promoting effect on surface runoff and sediment yield on slopes. This is partly because bedrock fragments in the soil primarily contribute to enhancing the overall soil erosion resistance, thereby reducing soil loss and lowering erosion rates [10,33], and partly because bedrock fragments, in this case, lead to significant changes in soil physical properties and affect soil structure and infiltration rates [34,35]. However, whether this impact increases or decreases runoff volume and sediment yield depends largely on the distribution of bedrock fragments within the soil.…”

Section: Discussionmentioning

confidence: 99%

Bedrock Fragment Induced by Intensive Tillage Effect on Hydrological Properties and Erosion Processes under Different Rainfall Patterns

Wang,

He,

Zhang

et al. 2023

Agronomy

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To investigate the influence of bedrock fragmentation by intensive tillage on the hydrological characteristics and soil erosion processes on slopes, two experimental treatments (soil–bedrock mixtures, WB, and pure soil, CK) in steel tanks were subjected to simulated rainfall under five rainfall patterns (constant, increasing, decreasing, decreasing–increasing, and increasing–decreasing) with the same total rainfall of 90 mm. For each rainfall event, runoff and sediment concentration were sampled at regular intervals. The flow velocity (v), effective/critical shear stress (τ/τc), Darcy–Weisbach resistance coefficient (f), unit stream power (p), and soil erodibility factor (Kr) were calculated to analyze the differences in hydrodynamic characteristics between the WB and CK. Our experimental findings show that significant differences in runoff volume and sediment yield were observed among different rainfall patterns and stages. Bedrock fragmenting significantly promoted runoff and sediment production under different rainfall patterns, with runoff volume and sediment yield increasing by averages of 59.29% and 71.62%, respectively. An increasing trend in average contribution rate of bedrock to runoff volume and sediment yield was observed across three distinct intensities: 6.37% and 4.61% for 30 mm h−1, 12.53% and 7.53% for 90 mm h−1, as well as 14.79% and 36.98% for 150 mm h−1, respectively. The v and p values under various rainfall patterns exhibited an increasing trend from the upper to the bottom slope positions, whereas the f and τ values showed an opposite trend, regardless of the WB and CK. Compared with the CK, the v, f, and p values for the WB increased by 23.34% to 48.94%, 1.59% to 53.16%, and 3.86% to 27.86%, respectively, whereas the τ value decreased by 1.52% to 22.19% for varying-intensity rainfall patterns. Among the variable rainfall patterns, the WB significantly increased sediment yield and also had a promoting effect on runoff generation. However, the WB displayed better erosion resistance compared to the CK under constant rainfall patterns. Therefore, varied-intensity patterns had a profound impact on bedrock-induced runoff and sediment transport processes.

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Section: Discussionmentioning

confidence: 99%

Bedrock Fragment Induced by Intensive Tillage Effect on Hydrological Properties and Erosion Processes under Different Rainfall Patterns

Wang,

He,

Zhang

et al. 2023

Agronomy

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“…The positive correlation between clay, OM, and CEC reflect a typical soil dynamic in which clay and OM interact to form aggregates. In the aggregate structure, clay and OM are less exposed to water erosion (Zhu et al, 2022), and OM is less susceptible to rapid mineralization (Liu et al, 2022). This is particularly relevant in the Amazon, which experiences intense rainfall and high temperatures.…”

mentioning

confidence: 99%

“…These results reinforce the importance of considering the natural characteristics of these soils, which may be more fragile depending on the management conditions to which they are exposed. For example, low-clay soils (sandy soils) are more likely to suffer the greatest losses of soil carbon because of the absence of conservationist practices because the soil texture is related to the formation of aggregates, which directly influences its ability to retain OM (Zhu et al, 2022).…”

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confidence: 99%

Fertility and carbon stock in pasture and forest environments in the Southern Amazon

Silva,

S. Oliveira-Júnior

et al. 2024

Rev. bras. eng. agríc. ambient.

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Inadequate management of pasture soils in the Amazon has resulted in a predominance of degraded pastures. Considering the natural characteristics of this region can favor more appropriate strategies for sustainability, the objective of this study was to evaluate the differences in the chemical and physical attributes of pasture and forest soils in the Southern Amazon and to identify the most sensitive attributes of their fertility. Additionally, this study suggests appropriate management practices for sustainable pastures. Soil samples from the 0 to 0.20 m layer were analyzed to determine pH, exchangeable bases (calcium, magnesium, and potassium), exchangeable aluminum, potential acidity, phosphorus, organic carbon, bulk density, and texture. Pasture soils had a higher pH, calcium content, and bulk density than forest soils. However, the pasture soils had lower phosphorus and organic matter content. The soil organic carbon stocks were also lower in pasture soils, with levels 0.8 to 12 Mg ha-1 lower than in forest soils. The fertility attributes most sensitive to soil management in these pastures were phosphorus, pH, organic carbon, and bulk density. The lack of nutrients and soil and water conservation practices have contributed to the degradation of these pastures. Therefore, the recommended management for these pastures should aim to improve the organic matter content, reduce compaction, and replenish and cycle nutrients.

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Meta-analysis unveils differential effects of agroforestry on soil properties in different zonobiomes

Ngaba,

Mgelwa,

Gurmesa

et al. 2023

Plant Soil

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Aims Current comprehensive meta-analysis study aims to explore how agroforestry practices influence soil quality across different climate zones. Since numerous studies proposed agroforestry as the promising agroecological farming systems over conventional monoculture systems to maintain soil quality and to regenerate disturbed soil to counteract the negative consequences of global extensive agricultural approaches. Methods By employing the comprehensive meta-analysis technique on data from 125 studies conducted in tropical, temperate, and Mediterranean environments, we quantitatively assessed the effects of agroforestry on physical, chemical, and biological soil quality indicators. Results Rates of soil erosion, the most important indication of land degradation, were improved in agroforestry systems compared to monocultures, especially in temperate (-138%) and Mediterranean soils (-40%), due to agroforestry-induced improved soil texture, aggregate stability, and soil water regulation. Soil acidification was decreased in tropical (-128%) and Mediterranean soils (-96%), but increased in temperate soils (+ 104%) due to agroforestry practices. Low temperate soil pH suggests high Ca2+ leaching losses as evidenced by decreased Ca2+ (-68%) and increased Fe2+ (+ 129%) and Al3+ (+ 235%) contents. Agroforestry systems increased organic matter accumulation in temperate (+ 86%) and Mediterranean soils (+ 65%), carbon sequestration in all climatic zones (+ 48%: 33–73%), and respiration rates in temperate (+ 119%) and tropical soils (+ 105%). Soil microbial communities, enzyme activities as well as nutrient cycling and availability were generally enhanced in agroforestry systems compared to monocultures. Conclusions Our results provide compelling evidence that agroforestry practices can contribute substantially to sustainable improvement of global soil quality.

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Aggregate stability and size distribution regulate rainsplash erosion: Evidence from a humid tropical soil under different land-use regimes

Cited by 24 publications

References 73 publications

Bedrock Fragment Induced by Intensive Tillage Effect on Hydrological Properties and Erosion Processes under Different Rainfall Patterns

Bedrock Fragment Induced by Intensive Tillage Effect on Hydrological Properties and Erosion Processes under Different Rainfall Patterns

Fertility and carbon stock in pasture and forest environments in the Southern Amazon

Meta-analysis unveils differential effects of agroforestry on soil properties in different zonobiomes

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