Soil aggregates and pore changes under raindrop splash

2021 ◽  
Author(s):  
Guanglu Li ◽  
Yangyang Ren ◽  
Gangan Ma ◽  
Mingxi Yang ◽  
Yu Fu ◽  
...  
Keyword(s):  
Soil Aggregates ◽  
Raindrop Splash

Fragmentation of soil aggregates induced by secondary raindrop splash erosion

CATENA ◽  
2020 ◽  
Vol 185 ◽  
pp. 104342
Author(s):  
Yu Fu ◽  
Guanglu Li ◽  
Tenghui Zheng ◽  
Yingsong Zhao ◽  
Mingxi Yang
Keyword(s):  
Soil Aggregates ◽  
Splash Erosion ◽  
Raindrop Splash

scholarly journals Influence of litter source on soil splash rates and organic carbon loss in different soil horizons

Water SA ◽  
2019 ◽  
Vol 45 (1 January) ◽  
Author(s):  
Cosmas Parwada ◽  
Johan Van Tol
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Litter Quality ◽  
Rainfall Intensity ◽  
Soil Aggregates ◽  
Soil Horizon ◽  
Soil Horizons ◽  
Carbon Loss ◽  
Fresh Litter ◽  
Raindrop Splash

Organic litter stabilizes soil particles against the raindrop splash effect. To date, limited research has critically examined the effects of litter quality on soil aggregate detachment and soil organic carbon loss by raindrop splash impact. A study was conducted to determine the effects of different litter sources on quantity of splashed sediments and soil organic carbon (SOC) loss under simulated rainstorm patterns. Soils from seven sieved (< 0.25 mm) horizons mixed with either high-quality Vachellia karroo leaf (C/N = 23.8) and/or low-quality Zea mays stover litter (C/N = 37.4) were incubated in a laboratory for 30 weeks. Splashed sediments and SOC were measured at 1, 3, 8, 14, 23 and 30 weeks of incubation for each soil at 360 mm/h simulated rainfall intensity applied as either single 8-min rainstorm (SR) or 4 × 2-min intermittent rainstorms (IR) separated by a 72-h drying period. Organic litter significantly (P < 0.05) reduced the splashed sediments up to 8 and 14 weeks under IR and SR storms, respectively, and thereafter gradually lost its stabilizing effect on soil aggregates. In order to maintain low quantities of splashed sediments, fresh litter has to be re-applied after this stage. Generally, 13% and 25% more sediments were splashed under IR than SR at 1, 3 and 30, and 8, 14 and 23 weeks after incubation, respectively. Litter quality effect on splash sediments varied across soil horizons but were the same within a soil horizon. Soil horizons with more clay than sand particles had lower quantities of sediments. The SOC loss was influenced by the initial SOC content and primary particle size distribution. Rainstorm pattern and initial SOC content were the main factors that influenced SOC loss. However, more rainstorm patterns should be investigated for these soils.

The origin and loss of fractal scaling in simulated soil aggregates

1997 ◽  
Vol 48 (4) ◽  
pp. 643-650 ◽  
Author(s):  
J. W. CRAWFORD ◽  
S. VERRALL ◽  
I. M. YOUNG
Keyword(s):  
Soil Aggregates ◽  
Fractal Scaling

Modeling the Effects of Diffusion Limitations on Nitrogen-15 Isotope Dilution Experiments with Soil Aggregates

2003 ◽  
Vol 67 (2) ◽  
pp. 677-677
Author(s):  
John B. Cliff ◽  
Peter J. Bottomley ◽  
Roy Haggerty ◽  
David D. Myrold
Keyword(s):  
Isotope Dilution ◽  
Soil Aggregates ◽  
Diffusion Limitations ◽  
Dilution Experiments

Afforestation impacts microbial biomass and its natural 13C and 15N abundance in soil aggregates in central China

2016 ◽  
Vol 568 ◽  
pp. 52-56 ◽  
Author(s):  
Junjun Wu ◽  
Qian Zhang ◽  
Fan Yang ◽  
Yao lei ◽  
Quanfa Zhang ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Soil Aggregates ◽  
Central China ◽  
15N Abundance

Keystone species determine the “selection mechanism” of multispecies biofilms for bacteria from soil aggregates

2021 ◽  
Vol 773 ◽  
pp. 145069
Author(s):  
Xiang Xiong ◽  
Yanfang Xing ◽  
Jinzhi He ◽  
Li Wang ◽  
Zhenzhen Shen ◽  
...  
Keyword(s):  
Soil Aggregates ◽  
Keystone Species ◽  
Selection Mechanism ◽  
Multispecies Biofilms

scholarly journals Dynamics of Soil Organic Carbon and Labile Carbon Fractions in Soil Aggregates Affected by Different Tillage Managements

2021 ◽  
Vol 13 (3) ◽  
pp. 1541
Author(s):  
Xiaolin Shen ◽  
Lili Wang ◽  
Qichen Yang ◽  
Weiming Xiu ◽  
Gang Li ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Aggregates ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
No Tillage ◽  
Labile Carbon ◽  
Carbon Fractions ◽  
Soil Aggregate Stability ◽  
Positive Effects

Our study aimed to provide a scientific basis for an appropriate tillage management of wheat-maize rotation system, which is beneficial to the sustainable development of agriculture in the fluvo-aquic soil areas in China. Four tillage treatments were investigated after maize harvest, including rotary tillage with straw returning (RT), deep ploughing with straw returning (DP), subsoiling with straw returning (SS), and no tillage with straw mulching (NT). We evaluated soil organic carbon (SOC), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), microbial biomass carbon (MBC), and particulate organic carbon (POC) in bulk soil and soil aggregates with five particle sizes (>5 mm, 5–2 mm, 2–1 mm, 1–0.25 mm, and <0.25 mm) under different tillage managements. Results showed that compared with RT treatment, NT treatment not only increased soil aggregate stability, but also enhanced SOC, DOC, and POC contents, especially those in large size macroaggregates. DP treatment also showed positive effects on soil aggregate stability and labile carbon fractions (DOC and POXC). Consequently, we suggest that no tillage or deep ploughing, rather than rotary tillage, could be better tillage management considering carbon storage. Meanwhile, we implied that mass fractal dimension (Dm) and POXC could be effective indicators of soil quality, as affected by tillage managements.

scholarly journals Nutrient and Stoichiometric Characteristics of Aggregates in a Sloping Farmland Area under Different Tillage Practices

2021 ◽  
Vol 13 (2) ◽  
pp. 890
Author(s):  
Jie Zhang ◽  
Yaojun Liu ◽  
Taihui Zheng ◽  
Xiaomin Zhao ◽  
Hongguang Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Size Distribution ◽  
Soil Aggregates ◽  
Soil Aggregate ◽  
Elemental Content ◽  
Stoichiometric Ratio ◽  
Longitudinal Ridge ◽  
Stoichiometric Ratios ◽  
Sloping Farmland ◽  
Ridge Tillage

Sloping farmland is prevalent in hilly red soil areas of South China. Improper tillage patterns induce decreased soil organic matter, soil aggregate breakdown, and nutrient imbalance, thereby restricting crop production. However, the stoichiometric characteristics could reflect the nutrient availability which was mostly studied on bulk soil. The stoichiometric characteristics of soil aggregates with multiple functions in farmlands has rarely been studied. The study was to reveal the impact of tillage patterns on the size distribution, nutrient levels, and stoichiometric ratios of soil aggregates after 20 years’ cultivation. Soil samples of 0–20 cm and 20–40 cm from five tillage patterns, bare-land control (BL), longitudinal-ridge tillage (LR), conventional tillage + straw mulching (CS), cross-ridge tillage (CR), and longitudinal-ridge tillage + hedgerows (LH) were collected. The elemental content (C, N and P) and soil aggregate size distribution were determined, and the stoichiometric ratios were subsequently calculated. Through our analysis and study, it was found that the nutrient content of >2 mm soil aggregates in all plots was the highest. In the hedgerow plots, >2 mm water-stable soil aggregate content was increased. Therefore, LH plots have the highest content of organic matter and nutrients. After 20 years of cultivation, stoichiometric ratio of each plot showed different changes on soil aggregates at different levels. the C:N, C:P, and N:P ratios are lower than the national average of cultivated land. Among of them, the stoichiometric ratio in the LH plot is closer to the mean and showed better water-stable aggregate enhancement. Therefore, longitudinal-ridge tillage + hedgerows can be recommended as a cultivation measure. This study provides a reference for determining appropriate tillage measures, balancing nutrient ratios, and implementing rational fertilization.

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