蔗渣生物炭对岩溶峰丛洼地石灰土土-水特征曲线的影响  

Effect of Bagasse Biochar on Soil-water Characteristic Curve of Lime Soil in Karst Peak Cluster Depression

作　　者：王创业 李科[1] 郏金晨 徐煜 徐勤学[2,3] WANG Chuangye;LI Ke;JIA Jinchen;XU Yu;XU Qinxue(Guangxi Key Laboratory of Geotechnical Mechanics and Engineering,Guilin University of Technology,Guilin Guangxi 541004,China;Guangxi Key Laboratory of Theory and Technology of Environmental Pollution Control,Guilin University of Technology,Guilin Guangxi 541004,China;Collaborative Innovation Center of Water Pollution Control and Water Safety in Karst Region,Guilin University of Technology,Guilin Guangxi 541004,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学广西环境污染控制理论与技术重点实验室科教结合科技创新基地,广西桂林541004 [3]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004

出　　处：《佳木斯大学学报（自然科学版）》2024年第4期102-107,共6页Journal of Jiamusi University：Natural Science Edition

基　　金：国家重点研发计划(2022YFF1300702)。

摘　　要：岩溶地区岩石裸露、土壤浅薄且持水能力较低,其土壤水分保持和运动状况是其水土漏失治理的重要因素。生物炭拥有多孔结构和高比表面积,能改变土壤持水能力,但其种类、粒径、添加量和土壤类型等因素对土壤持水能力产生正面或负面作用,为了研究添加不同比例蔗渣生物炭对岩溶峰丛洼地石灰土持水特性的影响,选取位于广西河池地区岩溶峰丛洼地的石灰土壤作为试验样本,分别添加不同比例生物炭(0%,2%,4%,6%),利用滤纸法测定生物炭-石灰土混合土在0~40MPa吸附能力下土水特性曲线,并使用扫描电子显微镜(SEM)和核磁共振波谱法(NMR),观察生物炭-石灰土混合土的微观孔隙结构。研究结果表明:当土壤含水量超过30%时,不同比例生物炭掺入量的持水能力相似,土壤的持水性并不会随着生物炭掺入量的增加而持续提升。在添加生物炭0%,2%,4%时混合土的持水能力是在逐渐提高的,添加4%和6%时混合土的持水能力基本一致,这表明添加生物炭存在一个最优值和适用范围。建议岩溶峰丛地区石灰土含水率在30%以下时,施加4%~6%的蔗渣生物炭,可提高土壤的持水能力。The soil water retention and movement in karst areas are crucial for controlling soil and water loss,especially in areas with bare rock,shallow soil,and low water holding capacity.Biochar,known for its high specific surface area and pore structure,can potentially alter soil water holding capacity.However,the effects of biochar on soil water holding capacity can vary depending on its type,particle size,addition amount,and soil type.Therefore,this study aims to investigate the impact of adding bagasse biochar in different proportions on the water holding characteristics of calcareous soil in karst peak cluster depression.The experimental sample for this study was the lime soil found in the karst peak cluster depression in the Hechi area of Guangxi.Different proportions of biochar(0%,2%,4%,6%)were added to the soil,and the soil-water properties of the blended soil were assessed employing the filter paper technique at an adsorption capacity ranging from 0 to 40MPa.To observe the microscopic pore structure of the biochar-lime soil mixture,scanning electron microscopy(SEM)and nuclear magnetic resonance spectroscopy(NMR)techniques were employed.The results of the study indicated that the water holding capacity of different ratios of biochar was similar when the soil water content exceeded 30%.However,the water holding capacity of the soil did not continue to increase with the increase of biochar incorporation beyond this threshold.Through careful observation,it was determined that the inclusion of biochar at incremental amounts of 0%,2%,and 4%resulted in a progressive enhancement in the soil's ability to retain water.However,no notable disparity in water holding capacity was observed when biochar was incorporated at both 4%and 6%.This suggests that there is an optimal range for the addition of biochar.To improve the water holding capacity of lime soil in the karst peak cluster area,it is recommended to apply 4%to 6%bagasse biochar when the water content is below 30%.This application rate is well-suited for enhancing soi

关 键 词：岩溶峰丛洼地土壤 生物炭 滤纸法 土-水特征曲线 核磁共振波谱法 

分 类 号：S278[农业科学—农业水土工程]