Research Center for Land Use and Ecological Security Governance in Mining Area, School of Public Policy and Management, China University of Mining and Technology, Xuzhou, China.
College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.
Environ Monit Assess. 2023 Oct 6;195(11):1273. doi: 10.1007/s10661-023-11894-3.
The application of flue gas desulfurization gypsum (FGDG) improves the soil structure, reduces soil pH, and accelerates soil salt leaching. Biochar amendment to soil can affect the soil infiltration rate, increase soil porosity, decrease soil bulk density, and enhance the water retention capacity. This study investigated the interactive effect of FGDG and biochar on water infiltration characteristics and physicochemical properties as well as determined the optimal amendment rate as a saline-alkaline soil conditioner. Seven experimental schemes were designed, and the newly reclaimed cultivated soil from Pingtan Comprehensive Experimental Zone in Fujian Province, China, was used in an indoor soil column experiment to simulate soil infiltration. Five models were employed to describe the infiltration process. The power function was used to represent the dynamic process of the wetting front. The conclusions of this study are as follows: (1) there was a reduction in the infiltration capacity of saline-alkaline soil (sandy soil) in each treatment, and the application of FGDG alone had the highest inhibition effect compared to the control (CK). The Kostiakov model provides the best fit for the experimental data of soil cumulative infiltration. (2) All treatments increased the total porosity and water content of saline-alkali soil, with the combined application of FGDG and biochar found to be more effective. (3) The application of FGDG alone or in combination with biochar decreased the pH and increased the electrical conductivity of the saline-alkali soil significantly, with the combined application having the most significant effect. In contrast, soil amended with biochar alone had minimal effect on the pH and EC of the soil. (4) The best improvement ratio was achieved with the F1B2 combination (75 g/kg FGDG + 30 g/kg biochar).
脱硫石膏（FGDG）的应用改善了土壤结构，降低了土壤 pH 值，并加速了土壤盐分淋洗。生物炭的添加可以影响土壤入渗率，增加土壤孔隙度，降低土壤容重，增强土壤持水能力。本研究探讨了 FGDG 和生物炭对水入渗特性和理化性质的交互作用，并确定了作为盐碱土改良剂的最佳添加率。设计了七个实验方案，使用来自中国福建平潭综合实验区的新开垦耕地进行室内土柱实验来模拟土壤入渗。采用了五个模型来描述入渗过程。幂函数被用来表示湿润锋的动态过程。本研究的结论如下：（1）盐碱土（沙土）的入渗能力在各处理中均有所降低，单独添加 FGDG 比对照（CK）的抑制效果最高。柯斯加科夫模型最适合土壤累积入渗的实验数据。（2）所有处理均增加了盐碱土的总孔隙度和含水量，FGDG 与生物炭的联合应用效果更为显著。（3）单独添加 FGDG 或与生物炭联合添加均显著降低了盐碱土的 pH 值和电导率，联合添加的效果最为显著。相比之下，单独添加生物炭对土壤的 pH 值和 EC 值影响最小。（4）F1B2 组合（75 g/kg FGDG + 30 g/kg 生物炭）的改良效果最好。
