施加生物炭对植被混凝土理化性质及狗牙根生物量的影响  

Influence of BiocharAddition Amount on Physicochemical Properties of Vegetation Concrete and Biomass of Cynodon dactylon

作　　者：刘大翔[1,2] 高贤 许亚坤 杨悦舒[1] 陈剑刚[2] 丁瑜[3,4] 夏栋[3,4] 肖海 许文年[3,4] LIU Daxiang;GAO Xian;XU Yakun;YANG Yueshu;CHEN Jiangang;DING Yu;XIA Dong;XIAO Hai;XU Wennian(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University),Ministry of Education,Yichang 443002,China;Key Laboratory of Mountain Hazards and Surface Processes,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;Engineering Research Center of Eco-environment in Three Gorges Reservoir Region(China Three Gorges University),Ministry of Education,Yichang 443002,China;Key Laboratory of Disaster Prevention and Mitigation(China Three Gorges University),Hubei Province,Yichang 443002,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室(三峡大学),湖北宜昌443002 [2]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [3]三峡库区生态环境教育部工程研究中心(三峡大学),湖北宜昌443002 [4]防灾减灾湖北省重点实验室(三峡大学),湖北宜昌443002

出　　处：《应用基础与工程科学学报》2021年第1期1-14,共14页Journal of Basic Science and Engineering

基　　金：国家重点研发计划项目(2017YFC0504902-02);国家自然科学基金项目(51708333,51678348);湖北省技术创新专项重大项目(2017ACA189);三峡库区地质灾害教育部重点实验室开放研究基金项目(2018KDZ11);防灾减灾湖北省重点实验室开放研究基金项目(2016KJZ13)。

摘　　要：以常见的苹果树枝生物炭为对象,采用室外盆栽试验探究不同炭土质量比(0%、2%、4%、6%、8%)对植被混凝土理化性质及狗牙根生物量的影响.结果表明:通过孔隙填充与颗粒置换效应,生物炭可以有效增加植被混凝土孔隙率和渗透系数,并降低干密度.随着生物炭掺量增加,植被混凝土内摩擦角无显著变化规律,黏聚力则由34.3k Pa快速降至24.5k Pa左右,但掺量对降幅影响不显著.植被混凝土p H值、硝态氮、铵态氮含量、狗牙根地上、地下生物量均与生物炭掺量正相关,硝态氮与铵态氮淋溶流失率则与生物炭掺量负相关.综合现行行业标准和已有工程实践经验对上述研究指标的规定与建议,认为当掺量为4%~6%时,既可使苹果树枝生物炭正面效应充分发挥,又能使负面效应处于可接受范围内.Outdoor pot experiment was adopted to explore influence of apple tree biochar with different addition amount( 0%,2%,4%,6%,8%) on physicochemical properties of vegetation concrete and biomass of Cynodon dactylon. The results indicated that increasing addition amount of biochar tended to effectively increase porosity and permeability and had a clear decreasing effect on dry density of vegetation concrete due to the pore filling and particle replacement effects. There was no obvious variation rule among the internal friction angles of all samples. Instead,the cohesive forces rapidly decreased from 34.3 kPa to 24.5 kPa once biochar was added,although the addition amount had no significant effect on decrease magnitude.Furthermore,it should be noted that biochar addition amount had significantly positive correlations with the pH value,nitrate nitrogen content,ammonium nitrogen content of vegetation concrete and the aboveground and underground biomass of Cynodon dactylon,while relations of the leaching loss rates of nitrate nitrogen and ammonium nitrogen to biochar addition amount were negative. According to the study results and current China energy industry standard about vegetation concrete eco-restoration technology,the recommended addition amount of biochar is between 4% and 6%,for which could bring positive effect of biochar into full play and ensure negative effect within acceptable range.

关 键 词：生态护坡 植被修复 植被混凝土 生物炭 填充与置换效应 理化性质 狗牙根 

分 类 号：S156.99[农业科学—土壤学]