文章摘要
改性煤矸石对砂姜黑土物理结构、有机碳组分的影响
Effect of acid and alkali modified gangue addition on physicochemical properties of sand ginger black soil
投稿时间:2024-03-30  修订日期:2024-05-16
DOI:
中文关键词: 改性煤矸石  砂姜黑土  物理结构  活性有机碳组分
英文关键词: modified gangue  sand ginger black soil  physical structure  active organic carbon fraction
基金项目:国家重点研发计划项目(2020YFC1908601);淮北矿业集团科技研发项目(No.2023-209)Project supported:National Key Research and Development Program (NKRDP) projects(2020YFC1908601);Huaibei Mining Group Science and Technology R D Program(No.2023-209)
作者单位邮编
殷奥杰 安徽理工大学地球与环境学院 232001
张世文* 安徽理工大学地球与环境学院 232001
周思雨 安徽理工大学地球与环境学院 
胡睿鑫 安徽理工大学地球与环境学院 
陈方可 安徽理工大学地球与环境学院 
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中文摘要:
      为了探究改性煤矸石对砂姜黑土胀缩性、有机碳及其组分的影响,将煤矸石破碎为三种水平(0~2、2~5、5~8 mm),选择3%氢氧化钠和5%盐酸溶液分别在75℃和70℃下浸泡保温两小时获得碱改性煤矸石和酸改性煤矸石,对煤矸石改性前后结构进行表征。以砂姜黑土为研究对象,通过室内培养试验分析改性煤矸石对土壤容重、总孔隙度、微观孔隙参数、收缩特征及有机碳组分变化规律。结果表明:(1)碱改性、酸改性煤矸石添加土壤容重(ρb)较对照显著降低25.60%~38.69%、26.19%~35.71%,较煤矸石处理降低1.57%~5.50%、0.85%~2.36%;总孔隙度(φ)较对照分别提高44.34%~67.02%、45.38%~61.88%,较煤矸石处理分别提高1.34%~3.84%、0.65%~2.19%;土壤微观孔隙体积均有一定程度下降,微观孔隙平均直径略微增大;土壤线性伸展系数(COLE)整体趋势为:对照>5~8 mm煤矸石>2~5 mm煤矸石>5~8 mm酸改性煤矸石>5~8 mm碱改性煤矸石>2~5 mm煤矸石≈2~5 mm酸改性煤矸石>2~5 mm碱改性煤矸石>0~2 mm酸改性煤矸石>0~2 mm碱改性煤矸石,收缩率(Shrinkage)整体趋势与COLE一致。(2)土壤有机碳(SOC)、溶解性有机碳(DOC)、易氧化有机碳(ROC)、微生物量碳含量(MBC)均显著增加了103.19%~328.88%、98.23%~470.50%、100.00%~279.90%、85.88%~347.53%。(3)随煤矸石粒径增大,土壤容重与碳组分均呈下降趋势,COLE与Shrinkage呈上升趋势。(4)相关性分析表明,ρb与φ呈负相关;COLE与Shrinkage呈正相关;COLE与Shrinkage与SOC、ROC、MBC均呈负相关;各碳组分之间呈正相关关系。综上酸碱改性煤矸石添加均能降低土壤容重、改善土壤孔隙结构及胀缩性,增加有机碳含量。碱改性改良效果总体优于酸改性,小粒径优于大粒径,综合得出结论:比较科学合理的改良措施是添加0~2 mm碱改性煤矸石,研究成果可为淮北地区砂姜黑土物理结构改善、有机质含量提升提供理论依据。
英文摘要:
      In order to investigate the effect of modified gangue on the expansion and contraction of sand ginger black soil, organic carbon and its components, the gangue was crushed into three levels (0-2 mm, 2-5 mm, 5-8 mm), and 3% sodium hydroxide and 5% hydrochloric acid solution were chosen to obtain alkali-modified gangue and acid-modified gangue by immersing and holding for two hours at 75℃ and 70℃, respectively, and the structure of the gangue before and after modification was characterized. Taking the sand ginger black soil as the research object, we analyzed the change rule of modified gangue on soil capacity, total porosity, microscopic pore parameter, shrinkage characteristics, and organic carbon fraction through an indoor cultivation test. The results showed that: (1) alkali-modified and acid-modified gangue added soil bulk weight (ρb) was significantly reduced by 25.60%~38.69% and 26.19%~35.71% compared with the control, and reduced by 1.57%~5.50% and 0.85%~2.36% compared with the gangue treatment; the total porosity (φ) was increased by 44.34%~67.02%, 45.38%~ 61.88%, compared with the gangue treatment increased by 1.34%~3.84%, 0.65%~2.19%, respectively; soil microscopic pore volume have a certain degree of decline, the average diameter of the microscopic pores slightly increased; the overall trend of soil coefficient of linear extension (COLE) is: control>5~8 mm gangue>2~5 mm gangue>5~8 mm acid-modified gangue>5~8 mm alkali modified gangue>2~5 mm gangue≈2~5 mm acid-modified gangue>2~5 mm alkali-modified gangue>0~2 mm acid-modified gangue>0~2 mm alkali-modified gangue, and the overall trend of Shrinkage is consistent with COLE. (2) Soil organic carbon (SOC), dissolved organic carbon (DOC), readily oxidizable organic carbon (ROC), and microbial mass carbon content (MBC) increased significantly by 120.57%~220.57%, 165.70%~347.57%, 91.82%~196.82%, and 32.92%~130.90%. (3) With the increase of gangue particle size, ρb, SOC, DOC, and ROC showed a decreasing trend, and COLE and MBC showed an increasing trend. (4) ρb is negatively correlated with φ; COLE is positively correlated with Shrinkage; COLE and Shrinkage are negatively correlated with SOC, DOC, and ROC. In summary, acid, and alkali-modified gangue addition can reduce soil bulk weight, improve soil pore structure and expansion and contraction, and increase organic carbon content. The effect of alkali modification is better than acid modification in general, small particle size is better than large particle size, and it is concluded that the more scientific and reasonable improvement measure is to add 0~2 mm alkali modified gangue, and the results of the research can provide theoretical basis for the improvement of the physical structure of the sandy ginger and black soil and the enhancement of the content of organic matter in Huaibei area.
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