改性煤矸石对砂姜黑土物理结构及有机碳组分的影响  

Effects of modified coal gangue on the physical structure and organic carbon components of Shajiang black soil YIN Aojie1

作　　者：殷奥杰 张世文[1,2] 周思雨 胡睿鑫 陈方可 YIN Aojie;ZHANG Shiwen;ZHOU Siyu;HU Ruixin;CHEN Fangke(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Anhui Engineering Laboratory of Comprehensive Utilisation of Soil and Water Resources and Ecological Conservation in High Submergence Mining Areas,Huainan 232001,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安徽省高潜水位矿区水土资源综合利用与生态保护工程实验室,安徽淮南232001

出　　处：《农业环境科学学报》2024年第8期1805-1814,共10页Journal of Agro-Environment Science

基　　金：国家重点研发计划项目(2020YFC1908601);淮北矿业集团科技研发项目(2023-209);煤炭安全精准开采国家地方联合工程研究中心开放基金项目(EC2023002)。

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3种水平(0~2、2~5、5~8 mm),并将其分别在3%氢氧化钠溶液(75℃)和5%盐酸溶液(70℃)中浸泡保温2 h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(ρb)、总孔隙度(φ)、微观孔隙参数、收缩特征及有机碳组分变化的影响。结果表明:碱改性、酸改性煤矸石添加后ρb较对照(不添加煤矸石处理)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%;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,微观孔隙平均直径增大;土壤线性伸展系数整体趋势为对照>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>0~2 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,收缩率整体变化趋势与土壤线性伸展系数一致。土壤有机碳、溶解性有机碳、易氧化有机碳、微生物生物量碳含量较对照分别增加了103.19%~328.88%、98.23%~470.50%、100.00%~279.90%、85.88%~347.53%。随煤矸石粒径增大,ρb与碳组分含量整体呈下降趋势,土壤线性伸展系数与收缩率呈上升趋势。结构方程表明,土壤胀缩性是影响土壤有机碳组分含量累积的关键因素。综上,酸、碱改性煤矸石添加均能降低土壤ρb、改善土壤孔隙结构及胀缩性,增加有机碳及其组分含量。碱改性改良效果总体优于酸改性,小粒径优于大粒径,因此得出淮北地区比较科学合理的砂姜黑土改良措施是添加0~2 mm碱改性煤矸石。This study explores the impact of modified coal gangue on the shrinkage characteristics,soil organic carbon(SOC),and its components in Shajiang black soil.Coal gangue was first processed into three particle sizes(0-2,2-5 mm,and 5-8 mm),and subjected to modification by soaking for two hours at 75℃in 3%sodium hydroxide(NaOH)and at 70℃in 5%hydrochloric acid(HCl)solutions,respectively,producing alkali-modified and acid-modified variants.Both the original and modified forms of coal gangue were characterized structurally.Subsequent laboratory incubation experiments with Shajiang black soil assessed alterations in soil bulk density(ρb),total porosity(φ),micro-pore characteristics,shrinkage behavior,and soil organic carbon components.The results showed that:Alkali-modified and acid-modified coal gangue significantly decreasedρb by 25.60%-38.69%and 26.19%-35.71%,respectively,compared to the control,and 1.57%-5.50%and 0.85%-2.36%compared to unmodified coal gangue.φincreased by 44.34%-67.02%and 45.38%-61.88%,respectively,compared to the control,with minor increments of 1.34%-3.84%and 0.65%-2.19%compared to the unmodified treatment,respectively,Moreover,a general decrease in micro-pore volume and an increase in their average diameter were observed.The overall trend for soil coefficient of linear extension was:control>5~8 mm coal gangue>2-5 mm coal gangue>5-8 mm acid-modified coal gangue>5-8 mm alkali modified coal gangue>0-2 mm coal gangue≈2-5 mm acid-modified coal gangue>2-5 mm alkali-modified coal gangue>0-2 mm acid-modified coal gangue>0-2 mm alkali-modified coal gangue,with the shrinkage showing a consistent overall trend with coefficient of linear extension.SOC,dissolved organic carbon(DOC),readily oxidizable organic carbon(ROC),and microbial mass carbon(MBC)content increased by 103.19%-328.88%,98.23%-470.50%,100.00%-279.90%and 85.88%-347.53%,respectively.As the particle size of coal gangue increased,ρb and carbon component content generally showed a decreasing trend,while coefficient of linear extension and

关 键 词：改性煤矸石 砂姜黑土 物理结构 有机碳组分 

分 类 号：S152[农业科学—土壤学] S153.6[农业科学—农业基础科学]