[Effects of Different Modified Corn Straw Biochar on Soil Hydraulic Properties in Hilly Loess Areas].

Q2 Environmental Science
Fang-Ling Chang, Pei-Zhen Zhang, Zong-Lu Yao, Juan Luo, Li-Xin Zhao, Li-Li Huo, Fen-Wu Liu
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引用次数: 0

Abstract

In order to investigate the influence of modified corn straw biochar on the hydraulic properties of water infiltration, evaporation, and water holding, corn straw biochar was prepared by pyrolysis at 500 ℃ for 2 hours in an N2 environment. Three solvents (H3PO4, NaOH, and NH4Cl) were selected, and different modified corn straw biochars were obtained by immersion modification at two concentrations (1 mol·L-1 and 3 mol·L-1). The physical and chemical properties of all biochars, such as elemental composition, pore structure, functional groups, and surface morphology, were systematically characterized. Each type of corn straw biochar was selected to perform soil hydraulic properties tests under three different additions (1%, 2%, and 3%). The influence of different corn straw biochar on the soil saturated hydraulic conductivity, water accumulation evaporation, and volume water content were analyzed by constant head method, soil evaporation test, and soil moisture characteristic curve. The results showed that the addition of modified corn straw biochar can significantly reduce the soil saturated hydraulic conductivity by 5.74%-46.69%, improve the soil volume water content by 0.74%-37.33%, and promote the soil water evaporation, while reduce the soil water accumulation evaporation by 0.63%-8.46% before the modification. With the increase in biochar addition, the saturated hydraulic conductivity of the soil decreased significantly, the cumulative evaporation gradually increased, and the volume water content showed a trend of first increasing and then decreasing. There was no correlation between the modified solution concentration and the soil saturated hydraulic conductivity, accumulated evaporation, and volume water content. This study can provide theoretical basis and technical support for improving the water retention performance of soil in the loess arid region of Shaanxi and Gansu.

[不同改性玉米秸秆生物炭对黄土丘陵区土壤水力学特性的影响]。
为研究改性玉米秸秆生物炭对水分入渗、蒸发和持水水力性能的影响,在N2环境下,500℃热解2小时制备玉米秸秆生物炭。选择3种溶剂(H3PO4、NaOH和NH4Cl),在2种浓度(1 mol·L-1和3 mol·L-1)下浸泡改性,得到不同的改性玉米秸秆生物炭。系统表征了各种生物炭的理化性质,如元素组成、孔结构、官能团和表面形貌等。选择每种玉米秸秆生物炭在三种不同添加量(1%、2%和3%)下进行土壤水力特性试验。通过恒水头法、土壤蒸发试验和土壤水分特征曲线分析不同玉米秸秆生物炭对土壤饱和导水率、水分积累蒸发和体积含水量的影响。结果表明,添加改性玉米秸秆生物炭可显著降低土壤饱和导水率5.74% ~ 46.69%,提高土壤体积含水量0.74% ~ 37.33%,促进土壤水分蒸发,而改性前土壤水分积累蒸发量降低0.63% ~ 8.46%。随着生物炭添加量的增加,土壤饱和水导率显著降低,累积蒸发量逐渐增加,体积含水量呈现先增加后减少的趋势。改性溶液浓度与土壤饱和导水率、累积蒸发量、体积含水量均无相关性。本研究可为提高陕甘黄土干旱区土壤的保水性能提供理论依据和技术支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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