Physicochemical determinants in stabilizing soil aggregates along a hydrological stress gradient on reservoir riparian habitats: Implications to soil restoration

Ran, Yiguo; Ma, Maohua; Liu, Yan; Zhu, Kai; Yi, Xuemei; Wang, Xiaoxiao; Wu, Shengjun; Huang, Ping

doi:10.1016/j.ecoleng.2019.105664

Cited by 32 publications

(14 citation statements)

References 49 publications

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“…The soils were sieved (<2 mm) to remove crop residues, stones, etc. (Ran et al, 2020), and deposited at À80 C for real-time PCR and Illumina MiSeq sequencing. DNA was amplified using primers 515F/907R and ITS1F/ITS2R for the highly variable regions of bacterial and fungal 16S rRNA V4 regions, respectively.…”

Section: High-throughput Sequencing and Analysismentioning

confidence: 99%

Subsurface organic ameliorant plus polyethylene mulching strengthened soil organic carbon by altering saline soil aggregate structure and regulating the fungal community

et al. 2022

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Subsurface organic ameliorant plus polyethylene mulching is a novel strategy for saline soil improvement and utilization in China. However, little is known about how this strategy impacts soil organic carbon (SOC) both directly (carbon input) and indirectly (soil aggregates protection and microbial regulation). Therefore, a field experiment was arranged and sampled after 3 years, including four treatments, i.e., no ameliorant with and without polyethylene mulching, and subsurface (10–30 cm soil depth) organic ameliorant with and without polyethylene mulching. Subsurface organic ameliorant raised the SOC content in the 0–40 cm by 70% and 90% with and without mulching, respectively. Subsurface organic ameliorant converted the major aggregation size from <0.053 to 0.25–2 mm, indicating that both direct carbon (C) input and indirect soil aggregates protection contributed to the increase in SOC content. In contrast, polyethylene mulching reduced the SOC content by 16% and 6% with and without organic ameliorant respectively. This was due to lower fungal diversity by 9%–14% and supported by the positive effect from fungal diversity to SOC. Further, the subsurface organic ameliorant plus polyethylene mulching increased SOC by 61% through direct C input, indirect soil aggregates protection and microbial regulation. Meanwhile, the contribution of physical protection standardized total effect (STE) = 0.223–0.294] was higher than microbial regulation (STE = 0.040–0.162) according to a structural equation model. Consequently, subsurface organic ameliorant plus polyethylene mulching represents a feasible agricultural practice to increase the SOC content for saline soil amelioration.

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Section: High-throughput Sequencing and Analysismentioning

confidence: 99%

Subsurface organic ameliorant plus polyethylene mulching strengthened soil organic carbon by altering saline soil aggregate structure and regulating the fungal community

et al. 2022

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“…MWD at 2 m is lower than at 0 m and 20 m for the different historical land-use types, suggesting that water impoundment reduces soil-aggregate stability in the waterward location of the reservoir buffer strips [8,59]. This finding may be mainly due to the fact that 2 m is closer to the bank where the soil is frequently in alternating dry-wet cycles caused by groundwater table elevation and surface runoff, which makes the soil at this location more susceptible to disintegration and thus reduces soil-aggregate stability [60,61].…”

Section: Soil Aggregates Stability Characteristics Of Historical Land...mentioning

confidence: 98%

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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“…As a cementitious material, soil clay is combined with humified soil organic matter and polyvalent metal cations [59], which contributes to the stability of soil aggregates. However, clayey particles may mainly combine with particles in micro-aggregates, thus negatively affecting the stability of aggregates [60]. The low correlation between the stability of aggregates and soil water content and soil maximum hygroscopicity might be due to the fact that the dry-wet cycle promoted the formation of aggregates on the one hand [61] and accelerated the decomposition of aggregates on the other hand [62], and these two different effects weakened the influence of soil moisture on aggregates.…”

Section: Effects Of Soil Physical and Chemical Properties On Soil Agg...mentioning

confidence: 99%

The Changes in Soil Microorganisms and Soil Chemical Properties Affect the Heterogeneity and Stability of Soil Aggregates before and after Grassland Conversion

et al. 2022

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The conversion of grasslands to croplands is common in the agro-pastoral ecotone and brings potential risks to soil health and environmental safety. As the forming unit of soil structure, the status of soil aggregates determines soil health and is affected by multiple factors. This study investigated the changes in soil aggregate and main related factors in conversion grasslands with different managed years. Grassland conversion ages were selected as experimental treatments, which included unmanaged grassland, 3 years, 10 years, 30 years, and 50 years since grassland conversion. After grassland conversion, the proportion of large macro-aggregates with a particle size of >2 mm in the 0–10 cm soil layer decreased, small macro-aggregates with a particle size of 2–0.25 mm and micro-aggregates with a particle size of 0.25–0.053 mm increased, while aggregates with a particle size of <0.053 mm had no significant change. Soil chemical properties, most microorganisms and the soil aggregate stability indices MWD and GMD decreased at the early stage (<30 years) of the managed grasslands. After about 50 years of cultivation, soil chemical properties and microorganisms returned to equal or higher levels compared to unmanaged grasslands. However, the stability of aggregates (mean weight diameter (MWD) and geometric mean diameter (GMD)) did not recover to the initial state. MWD and GMD were positively correlated with most bacterial factors (total phospholipid fatty acids (PLFAs), bacteria, Gram-positive bacteria, Gram-negative bacteria, actinomycetes and arbuscular mycorrhizal fungi (AMF)) and some soil chemical properties (carbon, nitrogen and polysaccharides). According to the partial least square structural equation model, soil organic carbon, total nitrogen and phosphorus in the 0–10 cm soil layer explained 33.0% of the variance in MWD by influencing microorganisms. These results indicated that the stability of aggregates was directly driven by microorganisms and indirectly affected by soil organic carbon, total nitrogen and phosphorus.

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Physicochemical determinants in stabilizing soil aggregates along a hydrological stress gradient on reservoir riparian habitats: Implications to soil restoration

Cited by 32 publications

References 49 publications

Subsurface organic ameliorant plus polyethylene mulching strengthened soil organic carbon by altering saline soil aggregate structure and regulating the fungal community

Subsurface organic ameliorant plus polyethylene mulching strengthened soil organic carbon by altering saline soil aggregate structure and regulating the fungal community

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 Changes in Soil Microorganisms and Soil Chemical Properties Affect the Heterogeneity and Stability of Soil Aggregates before and after Grassland Conversion

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