芦苇基外源碳输入对土壤性质及有机碳矿化的影响  

Effects of Reed-based Exogenous Carbon Input on Soil Properties and Organic Carbon Mineralization

作　　者：刘玲[1,2] 苏莹 王洪杰 王雨行 何畅 王尚玮 Liu Ling;Su Ying;Wang Hongjie;Wang Yuhang;He Chang;Wang Shangwei(School of Eco-environment,Hebei University,Baoding,Hebei 071002,China;Hebei Provincial Key Laboratory of Wetland Near-nature Restoration Technology,Hebei University,Baoding,Hebei 071002,China;China South-to-North Water Diversion Eastern Route Co.,Ltd.,Beijing 100070,China)

机构地区：[1]河北大学生态环境系,河北保定071002 [2]河北省湿地近自然修复技术重点实验室,河北大学,河北保定071002 [3]中国南水北调集团东线有限公司,北京100070

出　　处：《水土保持通报》2024年第5期251-261,共11页Bulletin of Soil and Water Conservation

基　　金：河北省重点研发计划项目“白洋淀农村生活污水处理设施提质增效关键技术集成研究与示范”(21373601D);石家庄市科技计划项目“人工湿地组合系统水生植物碳转化关键过程与固碳效应研究”(221240223A);京津冀(雄安新区)生态安全与生态保护教育部工程研究中心开放课题“湿地植物-碳-水-微生物的耦合效应及机制”(2024-06)。

摘　　要：[目的]探究外加芦苇基碳源对土壤理化性质和有机碳稳定性的影响,为芦苇资源化材料在土壤改良中应用提供理论支持。[方法]采用芦苇基好氧堆肥产品(生物炭调理堆肥T_(1);底泥、生物炭调理堆肥T 2)、秸秆(RS)和生物炭(RB)作为外源碳材料进行60 d土壤培养试验,分析不同外源碳及不同添加量(5%,10%,15%)对土壤理化性质、酶活性、土壤有机碳矿化的影响。[结果]不同外源碳影响土壤养分含量,添加外源碳试验组培养初期土壤有机碳较对照组显著提高了28.0%~64.2%(p<0.05);培养末期添加生物炭和堆肥试验组土壤有机碳含量较初始阶段显著降低了15.5%~23.5%,土壤全氮降低了20.0%~69.1%。外源碳添加提高了土壤β-葡萄糖苷酶、脱氢酶含量,生物炭和堆肥影响最显著,土壤β-葡萄糖苷酶、脱氢酶与土壤容重、有机碳、全氮含量表现为极显著的正相关性(p<0.01)。外源碳添加土壤培养试验期间有机碳累积矿化量符合一级动力学模型,添加秸秆、生物炭试验组土壤有机碳矿化量为652.9~758.2 mg/kg,显著高于对照组(532.8 mg/kg)和堆肥T 2试验组(598.3~623.7 mg/kg),且外源碳添加量对土壤有机碳矿化影响显著。[结论]芦苇基外源碳输入有利于改善土壤理化性质,显著提高酶活性;芦苇秸秆对土壤有机碳矿化的激发效应显著高于生物炭和堆肥。[Objective]The impact of reed-based exogenous carbon on soil properties and organic carbon stability was investigated to provide theoretical insights into the application of reed resource materials for soil improvement.[Methods]A 60-day soil culture test was conducted for the application of various exogenous carbon materials,including reed aerobic compost(compost T_(1) conditioned with biochar and compost T 2 conditioned with sediment and biochar),straw(RS),and biochar(RB).The effects of different exogenous carbon sources and amounts(5%,10%,and 15%)were analyzed on the physicochemical properties,enzyme activities,and organic carbon mineralization of the soil.[Results]The application of exogenous carbon influenced the soil nutrient content,with the soil organic carbon content in the experimental group increasing significantly by 28.0%-64.2%compared to that in the control group(p<0.05)at the beginning of the culture.Compared with the initial stage,the organic carbon content of the soil supplemented with biochar and compost at final stage was significantly reduced by 15.5%-23.5%,whereas the total nitrogen content of the soil at final stage decreased by 20.0%-69.1%.The concentrations ofβ-glucosidase and dehydrogenase increased following the addition of exogenous carbon,with the most significant effect observed for biochar and compost.Theβ-glucosidase and dehydrogenase contents in the soil presented highly significant positive correlations with the soil bulk density,carbon source content,and total nitrogen(p<0.01).The cumulative mineralization of organic carbon in the soil following the addition of exogenous carbon during the culture experiment exhibited first-order kinetics,while the soil organic carbon mineralization in the straw and biochar treatment groups was 652.9-758.2 mg/kg,which was significantly higher than that in the control group(532.8 mg/kg)and T2 composting(598.3-623.7 mg/kg)treatments.The amount of exogenous carbon added significantly influenced the soil organic carbon mineralization.[Conclusion]The

关 键 词：芦苇秸秆 生物炭 堆肥 土壤理化性质 土壤酶 有机碳矿化 

分 类 号：X712[环境科学与工程—环境工程]