Synergistic effects of rock fragment cover and polyacrylamide application on erosion of saline-sodic soils

Tang, Shengqiang; She, Dongli

doi:10.1016/j.catena.2018.06.033

Cited by 22 publications

(5 citation statements)

References 52 publications

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“…Several mechanisms might also explain the positive effects of soil structure after biochar addition, such as the concentric and hierarchical theories, the precipitation of carbonates, phosphates, hydroxides, and oxides that enhance the aggregation, as well as the cations that form connections between organic matter and clay particles (Juriga & Šimanský, 2018). The soil mean weight diameter and the content of macroaggregates increased significantly with increasing PAM amount, and it was in accordance with some studies (Abulaiti et al, 2023; Tang & She, 2018). Over time, the changes in the soil mean weight diameter and the content of macroaggregates were not significant after amendment with biochar and PAM.…”

Section: Discussionsupporting

confidence: 91%

“…The fact that long-term successive seasonal biochar addition improved soil aggregation was also found by He, Zhao, et al (2020) and Zhang et al (2020). Several mechanisms might also explain the positive effects of soil structure after biochar addition, such as the concentric and hierarchical theories, the precipitation of carbonates, phosphates, hydroxides, and oxides that enhance the aggregation, as well as the cations that form connections between organic matter and clay particles PAM amount, and it was in accordance with some studies (Abulaiti et al, 2023;Tang & She, 2018). Over time, the changes in the soil mean weight diameter and the content of macroaggregates were not significant after amendment with biochar and PAM.…”

Section: Water Flow and Salt Transport In Soil Under Different Amendm...supporting

confidence: 88%

“…Biochar can increase the soil organic carbon content and cation exchange capacity, stabilize the soil structure, and exchange sodium in the soil solution with calcium (Bhaduri et al, 2016; He, He, et al, 2020; Saifullah et al, 2018). Another popular soil amendment, the high molecular polymer polyacrylamide (PAM), has gradually attracted attention in relation to improving soil water retention and permeability, and controlling soil erosion (Guo et al, 2022; Tang & She, 2018). The application of PAM to the soil can facilitate the formation of new soil aggregates and stabilize the aggregated soil structure (Abulaiti et al, 2023; Albalasmeh et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Fei,

She,

et al. 2024

Land Degrad Dev

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Increasing scientific knowledge on the improvement of coastal saline soils is critical for spatially expanding coastal development. Biochar and polyacrylamide (PAM) are popular soil amendments, however, it remains unclear how they affect water and salt transport by regulating soil microstructure characteristics. In this study, we conducted a five‐year rice barrel trial and investigated the changes in the aggregates and microstructure of saline soils after adding biochar with three different application rates (B1 = 0%, B2 = 2%, and B3 = 5%, mass ratio) and PAM with three different application rates (P1 = 0%, P2 = 0.4‰, and P3 = 1.0‰, mass ratio), and simulated the water and salt transport. Results showed that at B1 and B2 treatments, soil μ‐CT porosity in 2020 increased by 89.8% and 208.0%, respectively, with respect to that in 2016. The development of soil mesopore structure was promoted at B2 treatments, whereas the P2 and P3 treatments promoted the development of the soil macrostructure. Compared with those of the blank control, soil internal mean water flow rate increased by 22.2% at B2 treatments and 69.2% at P2 treatments, respectively. However, their increases were less pronounced at B3 treatments and the water flow rate decreased by 50.5% at P3 treatments. It might be reasonably attributed to the reason that porous biochar helped the formation of soil pore structure while an excessive amount of biochar blocked soil pores. Furthermore, PAM amendment helped to form soil aggregates while an excessive amount of viscous PAM might block soil pores or form a viscous layer. The time corresponding to the maximum salt concentration was negatively correlated with soil μ‐CT porosity (R2 = 0.27) and pore connectivity density (R2 = 0.29). Our findings indicate that appropriate amounts of biochar and PAM can help improve saline soil structure in coastal areas, improve their hydraulic properties, and alleviate salt stress.

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Section: Discussionsupporting

confidence: 91%

Section: Water Flow and Salt Transport In Soil Under Different Amendm...supporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Fei,

She,

et al. 2024

Land Degrad Dev

View full text Add to dashboard Cite

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“…Previous studies have noted that PAM application improves soil water content, especially at a PAM application rate of 0.04%. The application of PAM can stabilize soil structure with high efficiency and thereby lead to a reduction in water use (Tang and She 2018). The application of PAM improved soil structure by creating small pores in the soil, which allowed more soil components to combine and for more water to enter the soil.…”

Section: Discussionmentioning

confidence: 99%

Effects of ionized brackish water and polyacrylamide application on infiltration characteristics and improving water retention and reducing soil salinity

et al. 2021

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There is an urgent need for brackish groundwater-based irrigation methods to be developed for saline soils that are effective, economically advantageous, and environmentally friendly. The use of both ionized brackish water and polyacrylamide (PAM) might provide such a method. The long-term use of brackish water irrigation can lead to the secondary salinization of soil and, as a consequence, restrict the development of the agricultural economy. Here, we conducted one-dimensional vertical infiltration experiments to examine the effects of ionized brackish water and PAM on soil infiltration characteristics. The result indicated that the water retention of soil first increased and then decreased with the increased in PAM application rates. The maximum water retention of soil was obtained in PAM application of 0.04% for ionized brackish water treatment. Soil water storage for the 0.04% PAM application under ionized brackish water irrigation was the highest and 5.1% higher compared with non-ionized brackish water at a PAM application rate of 0.04%. The ionized brackish water treatment at a PAM application rate of 0.04% improved the desalinization efficiency by 2.3% compared with non-ionized brackish water treatment. Thus, ionized treatment and PAM application are effective for improving the characteristics of soil water and salt transport and permit the safe use of brackish groundwater for irrigation.

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“…Besides, the rocks were just resting on the soil surface (Li et al, 2022) or shallowly embedded (de Figueiredo & Poesen, 1998; Gong et al, 2018) in the topsoil. The metal boxes applied were typically limited in size with lengths of <4 m, mostly 2 m, and depths not exceeding 0.5 m (Omidvar et al, 2019; Tang & She, 2018). Even in the simulation studies that employed larger rocks with a diameter >35 cm and steel tanks of 4–5 m in length (Dai, Peng, Yang, et al, 2017; Dai, Peng, Zhao, et al, 2017; Gan, He, Qin, & Li, 2020), limitations still exist in the simulation of the natural karst slope conditions in the field.…”

Section: Introductionmentioning

confidence: 99%

Effects of rock outcrops on runoff and erosion from karst slopes under simulated rainfall

Zhang,

Ma,

Qihua

et al. 2023

Land Degrad Dev

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Rock outcrops play a crucial role in affecting hydrological and erosion processes on karst hillslopes. However, due to various difficulties in constructing runoff plots on field rocky slopes, previous studies used small metal flumes to simulate outcropped slopes, which greatly differed from the natural rock outcropped slopes. In this study, the effects of rock outcrops on runoff and erosion were studied on karst slopes with natural soil–rock conditions at a larger plot scale (10 m in length × 2.2 m in width, 25° in gradient). Simulated rainfall experiments were conducted on the four runoff plots with different rock outcrop coverages (0%, 5%, 13%, and 42%) under five rainfall intensities (30, 60, 90, 120, and 150 mm·h−1). The study indicated that the rock outcrops complexed the water erosion processes by playing multiple and opposite roles simultaneously. It positively influences water erosion by serving as impermeable surfaces, providing preferential flow paths, and offering flow barriers to hillslopes. Conversely, it can exacerbate erosion by causing increased runoff, concentrating flow paths, and thus intensifying erosion in specific areas. Besides, the effects of these roles varied with the coverage of rock outcrops and rainfall intensity. The main results showed that (i) limited rock outcrop coverage (5% and 13%) increased runoff and erosion, but the opposite was observed on the severe rocky slope (42%). Both “infiltration‐excess” and “saturation‐excess” mechanisms coexisted by turns on karst slopes during rainfall; the break of “saturation balance” tended to occur on the severe rock outcrop slope with abundant soil–rock interface and underground fissures. (ii) Rock outcrops greatly increased the spatial variability and uncertainty of hydrological and erosion processes on karst slopes. The rock outcrops resulted in a larger range of variation in flow velocity and a greater difference among the three slope positions; it also brought more spatial heterogeneity in the development of rill erosion. (iii) Rock outcrops tended to increase flow velocity, and intensify flow turbulence, stream power, and flow energy. The severe rock outcrops significantly reduced the soil erosion induced by the limited soil detachment. This study contributes to a deeper understanding of the mechanisms behind how rock outcrops influence runoff and erosion and provides insights for improving soil erosion prediction in karst regions.

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Synergistic effects of rock fragment cover and polyacrylamide application on erosion of saline-sodic soils

Cited by 22 publications

References 52 publications

Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Effects of ionized brackish water and polyacrylamide application on infiltration characteristics and improving water retention and reducing soil salinity

Effects of rock outcrops on runoff and erosion from karst slopes under simulated rainfall

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