Effects of biochar application on phreatic water evaporation and water-salt distribution in coastal saline soil

Yang, Rui; Zhou, Cuixiang; Zhu, Jinjin; Pan, Yinghua; Sun, Jingsheng; Zhang, Zhenhua

doi:10.1080/01904167.2019.1605379

Cited by 14 publications

(8 citation statements)

References 24 publications

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“…The groundwater is like a stockroom which continuously exports the soluble salts into soil profiles. In addition, soil salt is finally accumulated and stored in topsoil during the process of soil evaporation and capillary water rise [46,48].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, we took the changes in topsoil organic matter content into account to estimate its impacts on soil hydrodynamics and salt distribution in the soil column experiments. As capillary water rising capacity is related to soil porosity, texture, and structure [48], the changes in topsoil structure induced by organic amendment influence soil evaporation as well as salt accumulation. For example, capillary water rise was prevented in the OA 1.0 treatment and there was no salinization observed in the salt accumulation experiment (Figure 6), which indicates that with the increase in SOM, it became hard for stored salts to move upward to the soil surface.…”

Section: Discussionmentioning

confidence: 99%

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Soil Organic Matter Input Promotes Coastal Topsoil Desalinization by Altering the Salt Distribution in the Soil Profile

Li,

Feng

et al. 2024

Agronomy

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Organic amendment is an effective method to reclaim salt-affected soil. However, in coastal land with shallow saline groundwater, it is limited known about the mechanism of organic amendment on soil desalinization. Thus, to examine the effect of topsoil organic matter content on soil water/salt transport and distribution, two-year field observations in Bohai coastal land, North China, and soil column experiments simulating salt accumulation and salt leaching were conducted, respectively. There were different organic fertilizer amendment rates in 0–20 cm topsoil, 0% (CK), 50% (OA 0.5), and 100% (OA 1.0) (w/w) for soil column experiments. Field observation showed that after organic amendment (OA), the soil’s physical structure was improved, and less of the increase in topsoil salt content was observed, with more salt accumulated in deep soil layers during the dry season. In addition, OA greatly promoted salt leaching during the rainy seasons. The results of the soil column tests further indicated that OA treatments significantly inhibited soil evaporation, with less salt accumulated in the topsoil. Although there was no difference in soil water distribution between the CK and OA 0.5 treatment, the topsoil EC for the OA 0.5 treatment was significantly lower than that for CK. During soil water infiltration, the OA 0.5 and OA 1.0 treatments significantly increased the infiltration rates, enhanced the wetting front, and promoted salt leaching to deeper soil layers, compared with CK. The improvement of soil organic amounts could make the soil more self-resistant to the coastal salinization. The findings of this study provide some insights into soil water/salt regulation in heterogeneous soil masses and on the permanent management of coastal saline farmland.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Soil Organic Matter Input Promotes Coastal Topsoil Desalinization by Altering the Salt Distribution in the Soil Profile

Li,

Feng

et al. 2024

Agronomy

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“…Previous studies have shown that different biochar application amounts and particle size significantly decreased water infiltration (Sun et al, 2019). However, the biochar application rate in most studies was >1.0%, and the particle size was greater than millimetre level (Pu et al, 2019; Yang et al, 2019). The NBC application affected the water infiltration when the application rates differed, and this is similar to biochar.…”

Section: Discussionmentioning

confidence: 99%

Effects of biochar nanoparticles as a soil amendment on the structure and hydraulic characteristics of a sandy loam soil

Chen

Duan

Zhou

et al. 2021

Soil Use and Management

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Biochar as a soil amendment can influence the physical and solute transport properties of soils and, thus, provide a means to improve soil fertility. However, the use of different sized biochar particles down to the nano‐scale has revealed inconsistent results, with the mechanisms poorly understood owing to a lack of experimental data. This study investigated the effects and mechanisms of nano‐sized biochar particles (NBC) applied to a sandy loam soil with regard to impacts on the hydraulic characteristics and soil structure. Column experiments were carried out with NBC application rates of 0.0%, 0.3%, 0.5%, 0.7% and 1.0% (by weight). It was found that the NBC changed the distribution of the soil pore structure and affected the degrees of anisotropy, fractal dimension, soil porosity and stability of soil aggregates. NBC applications also increased the water repellency of the soil and reduced the surface energy of soil particles. Regarding soil hydraulic properties, NBC applications increased the saturated hydraulic conductivity of the soil and decreased soil water retention. Increasing the amount of NBC applied to the mixing‐layer decreased cumulative infiltration values (reduced by 3.75%–13.75%). The above results reveal how NBC affects the soil pore structure and soil hydraulic characteristics, which provides a theoretical basis for the systematic evaluation of soil improvement and environmental effects of nano‐sized biochar.

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“…According to Yin et al [11], ground cover can effectively reduce soil water evaporation while concurrently impeding salt accumulation on the surface. Straw is the most common organic mulch material in almost all climatic zones [12] and, when applied in the field, can improve soil water utilization by reducing soil evaporation and keeping soil temperatures in the right range for crop growth [13]. Carson et al [14] discovered that mulching with crop residues resulted in a 10-20% increase in water use efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effect of Straw Mulching and Deep Burial Mode on Water and Salt Transport Regularity in Saline Soils

Li,

Wang,

Wang

et al. 2023

Water

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To examine the impacts of various straw mulching techniques, this study used the indoor soil column test as the primary research method and the field test as the validation test on the salinity dynamics of saline and alkaline soils. The experiment in this study was designed with five treatments: SC means for straw covered on the soil surface; DB means for straw buried 40 cm below the soil surface; S1D1, S2D1, and S1D2 represent the ratio of soil surface cover to the amount of straw buried 40 cm below the soil surface as 1:1, 2:1, and 1:2, respectively. The results of the indoor soil column test showed that all kinds of straw mulching techniques could effectively reduce soil moisture evaporation, and the straw mulching and deep burial mode was more effective: after 45 days of evaporation, compared with that of CK, the cumulative evaporation of soil moisture were reduced by 29.61%, 27.49%, 37.87%, 65.85%, and 54.58% for SC, DB, S1D1, S2D1, and S1D2, respectively; the straw mulching and deep burial mode could reduce the soil evaporation intensity more effectively than the single-layer straw mulching mode: the mean soil evaporation rates of CK, SC, DB, S1D1, S2D1 and S1D2 after 45 days of evaporation were 1.27 mm/day, 0.90 mm/day, 0.92 mm/day, 0.80 mm/day, 0.43 mm/day, and 0.58 mm/day; various straw mulching techniques could inhibit the accumulation of salts in the surface soil and effectively regulate the distribution of salts in the soil profile, among which the straw mulching and deep burial mode had the best effect of salinity suppression: after 30 days of evaporation, the re-salinization levels of the 0–40 cm soil layer of SC, DB, S1D1, S2D1, and S1D2 were reduced by 66.78%, 43.08%, 33.95%, 92.04% and 45.94% compared with that in the CK, respectively; there was a significant positive correlation between cumulative evaporation of soil moisture and cumulative soil salinity, which implied that cumulative soil salinity increased with the increase in cumulative evaporation of soil moisture. The results of the field experiment justified the results of the indoor soil column test: after four months of evaporation, the field moisture contents of CK, SC, DB, S1D1, S2D1, and S1D2 in the 0–20 cm soil layer were 14.77%, 3.51%, 15.10%, 15.26%, 18.73%, and 2.94%, respectively; during the experimental period, the salt inhibition rate of SC, DB, S1D1, S2D1 and S1D2 in 0–20 cm soil layer were 35.46%, 44.76%, 50.98%, 54.80% and 37.30%, respectively. Therefore, in a comprehensive view, S2D1 treatment had the best effect of salt and vapor suppression on saline soil. This study is of great significance for the resource utilization of straw waste, the improvement of water utilization and efficiency, and the management of soil salinization.

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Effects of biochar application on phreatic water evaporation and water-salt distribution in coastal saline soil

Cited by 14 publications

References 24 publications

Soil Organic Matter Input Promotes Coastal Topsoil Desalinization by Altering the Salt Distribution in the Soil Profile

Soil Organic Matter Input Promotes Coastal Topsoil Desalinization by Altering the Salt Distribution in the Soil Profile

Effects of biochar nanoparticles as a soil amendment on the structure and hydraulic characteristics of a sandy loam soil

Effect of Straw Mulching and Deep Burial Mode on Water and Salt Transport Regularity in Saline Soils

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