Hydrological stress regimes regulate effects of binding agents on soil aggregate stability in the riparian zones

Ran, Yiguo; Ma, Maohua; Liu, Yan; Zhou, Yue; Sun, Xiaoxiang; Wu, Shengjun; Huang, Ping

doi:10.1016/j.catena.2020.104815

Cited by 36 publications

(17 citation statements)

References 58 publications

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“…In this study, without consider 0 m site, we observed that the carbon content in sand particle was significantly lower than that in silt particle of both grassland and woodland; nevertheless, soil particle-size associated carbon distribution at 0 m may be influenced by organic matter carried by overlying water [66]. Although the carbon content in sand particle at W0 and W2 of the abandoned cropland was greater than that of the clay particle, the difference was not statistically significant probably because the carbon content of the soil macro-aggregate increased during previous cultivation [33,67].…”

Section: Particle-size Associated Nutrient Distribution Of Historical...mentioning

confidence: 52%

The Relationship between Soil Particle Size Fractions, Associated Carbon Distribution and Physicochemical Properties of Historical Land-Use Types in Newly Formed Reservoir Buffer Strips

et al. 2022

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Water impoundment reshapes the ecological environment around the bank-line of newly built reservoirs. Therefore, reservoir buffer strips play a disproportionately large role in the maintenance of ecosystem functions and environmental benefits during the early stage of reservoir formation. However, there are gaps in the research on soil particle-size-associated carbon distribution characteristics within different historical land-use types in newly formed reservoir buffer strips. In this study, we focused on soil particle size fractions, aggregate stability, and particle-size-associated carbon distribution characteristics of different historical land-use types of reservoir buffer strips at distance scale (i.e., different distance from the water) after reservoir impoundment in the Chushandian Reservoir, China, and explored the relationship between them. The results showed that the soil texture of abandoned cropland and grassland are classified as silt loam and woodland are classified as sandy loam; different historical land-use types in newly formed reservoir buffer strips showed significant differences in soil aggregate stability after reservoir impoundment; a distance scale was used to measure these differences, which were mainly due to the dry-wet cycles and water submerged condition caused by the buffers’ different distances from water. The newly formed reservoir buffer strips underwent corresponding changes in the particle-size-associated carbon distribution characteristics after reservoir impoundment, mainly due to the turnover property of different soil particles combined with organic carbon. Reservoir impoundment accelerates the turnover of silt particle and associated nutrients in soils of historical land-use types in newly formed reservoir buffer strips; turnover may be mediated mainly by microbial biomass.

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Section: Particle-size Associated Nutrient Distribution Of Historical...mentioning

confidence: 52%

The Relationship between Soil Particle Size Fractions, Associated Carbon Distribution and Physicochemical Properties of Historical Land-Use Types in Newly Formed Reservoir Buffer Strips

et al. 2022

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“…The formation of soil aggregate relies on organic materials, and the organic binding agents were mainly polysaccharides, roots and fungal hyphae, strongly sorbed natural polymers, and so forth. (An et al, 2013; Bronick & Lal, 2005; Ran et al, 2021; SDall & Oades, 1982). The roots and fungal in composition of LFOC could promote the formation of soil aggregate directly (Elliott, 1986; Oades, 1984).…”

Section: Discussionmentioning

confidence: 99%

Response of soil aggregate disintegration to the different content of organic carbon and its fractions during splash erosion

Liu

et al. 2021

Hydrological Processes

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Aggregate disintegration is a critical process in soil splash erosion. However, the effect of soil organic carbon (SOC) and its fractions on soil aggregates disintegration is still not clear. In this study, five soils with similar clay contents and different contents of SOC have been used. The effects of slaking and mechanical striking on splash erosion were distinguished by using deionized water and 95% ethanol as raindrops. The simulated rainfall experiments were carried out in four heights (0.5, 1.0, 1.5 and 2.0 m). The result indicated that the soil aggregate stability increased with the increases of SOC and light fraction organic carbon (LFOC). The relative slaking and the mechanical striking index increased with the decreases of SOC and LFOC. The reduction of macroaggregates in eroded soil gradually decreased with the increase of SOC and LFOC, especially in alcohol test. The amount of macroaggregates (>0.25 mm) in deionized water tests were significantly less than that in alcohol tests under the same rainfall heights. The contribution of slaking to splash erosion increased with the decrease of heavy fractions organic carbon. The contribution of mechanical striking was dominant when the rainfall kinetic energy increased to a range of threshold between 9 J m −2 mm −1 and 12 m −2 mm −1. This study could provide the scientific basis for deeply understanding the mechanism of soil aggregates disintegration and splash erosion.

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“…The mean weight diameter (MWD) of the soil aggregates was determined according to Ran et al (2021) by wet sieving. Soil aggregates were sieved into four fractions of different sizes (8–2, 2–0.25, 0.25–0.053, <0.053 mm), and the MWD was calculated as follows:

MWD goodbreak= \sum_{i = 1}^{n} x_{i} w_{i}

Where: x i is the mean diameter of each size fraction; w i is the proportional weight of the corresponding size fraction.…”

Section: Methodsmentioning

confidence: 99%

Accumulation of SOM fractions to croplands and plantations converted from cropland with black soil

et al. 2022

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Soil organic matter (SOM) decreases after the conversion of native grasslands to croplands and increases after the conversion of croplands to plantations. However, the reasons for loss and/or accumulation of SOM fractions remain unclear. Hence, we investigated SOM fraction quantity and quality of soils from cropland (CL), a plantation (PL) converted from cropland, and native grassland (NG) all converted from the black soil (Mollisols) region of China. Results showed that: (1) across all sites, coarse

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Hydrological stress regimes regulate effects of binding agents on soil aggregate stability in the riparian zones

Cited by 36 publications

References 58 publications

The Relationship between Soil Particle Size Fractions, Associated Carbon Distribution and Physicochemical Properties of Historical Land-Use Types in Newly Formed Reservoir Buffer Strips

The Relationship between Soil Particle Size Fractions, Associated Carbon Distribution and Physicochemical Properties of Historical Land-Use Types in Newly Formed Reservoir Buffer Strips

Response of soil aggregate disintegration to the different content of organic carbon and its fractions during splash erosion

Accumulation of SOM fractions to croplands and plantations converted from cropland with black soil

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