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

生物炭 土壤水分 土壤盐分 土壤结构 微观结构 修正案 环境科学 多孔性 土壤改良剂 碱土 土壤科学 农学 化学 生物 热解 政治学 结晶学 有机化学 法学
作者
Yuanhang Fei,Dongli She,Jun Yi,Xiaoqin Sun,Han Xiao,Dongdong Liu,Muxing Liu,Hailin Zhang
出处
期刊:Land Degradation & Development [Wiley]
卷期号:35 (7): 2382-2394 被引量:3
标识
DOI:10.1002/ldr.5066
摘要

Abstract 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 ( R 2 = 0.27) and pore connectivity density ( R 2 = 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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