摘要
有机碳是土壤中的重要组分,有机碳组分是影响土壤有机碳活性及生态效应的主要内因。为更好的揭示有机碳组分对生态环境演变的响应规律,系统的分级土壤有机碳是研究的重点。该研究为获得土壤有机碳多级浸提方法,在前人研究的基础上选择四种浸提剂,确定浸提时间,并对冀北坝上土壤进行测定。结果表明,浸提方法为:(1)水溶性有机碳,按照土水质量比1:2加入去离子水,振荡浸提12h,获得低分子量活性有机碳,占总有机碳的1.13%～3.35%;(2)热水解有机碳,残渣加入去离子水,在100℃下水浴2h,获得土壤团聚体表面吸附的有机碳等,占总有机碳2.75%～7.14%;(3)酸解有机碳,残渣加入1mol·L^(-1)的盐酸,浸提2h,获得富里酸等大分子有机碳,占总有机碳2.11%～7.15%;(4)碱解有机碳,残渣加入0.2mol·L^(-1)的Na OH,浸提6h,获得胡敏酸等稳定态腐殖质,占总有机碳8.17%～51.07%。浸提方法能较好反映不同溶解性有机碳组分对土地利用方式的响应。
Organic carbon is an important component in soil, and organic carbon components were the main internal factor affecting soil organic carbon activity and ecological effects. The research of the systematic classification of soil organic carbon can be to reveal the response laws of organic carbon components to the evolution of ecological environment. This study had obtained a multi-stage extraction method of soil organic carbon, selected four kinds of extractants based on previous studies to determine the extraction time and determined the soil organic carbon in the Weibei Dam. The results showed that the four extraction methods were followed.(1) To extract water-soluble organic carbon. The deionized water was added to soil according to the mass ratio of soil to water 1:2, and oscillated for 12 h to obtain low molecular weight active organic carbon. It accounted for 1.13%-3.35% of total organic carbon.(2) To obtain thermal hydrolysis of organic carbon. The residue was added to deionized water and heated for 2 h by water bath at 100 °C, and obtained the organic carbon adsorbed on the surface of the soil aggregate. The thermal hydrolysis of organic carbon accounted for 2.75% to 7.14% of the total organic carbon.(3) Fulvic acid and other macromolecular organic carbon (2.11-7.15%) were obtained by acidolysis of organic carbon and adding 1 mol L-1 hydrochloric acid to the residue for 2 h.(4) To obtain alkaliolytic organic carbon. The residue was added with 0.2molL-1 NaOH, and extracted for 6h to obtain stable humus such as humic acid, which accounted for 8.17~51.07% of total organic carbon. The extraction method could better ref lected the response of different dissolved organic carbon components to land use method.
出处
《科技创新导报》
2018年第29期83-87,共5页
Science and Technology Innovation Herald
基金
河北北方学院国家级大学生创新创业项目(项目编号:2017003)
河北北方学院卓越农林项目
河北北方学院博士基金(项目编号:12995543)
河北省科技攻关项目(项目编号:13226402D)
河北省科技支撑重点项目(项目编号:13226402D)
张家口科技支撑项目(项目编号:1611050C)
关键词
土壤
有机碳
溶解性有机碳
连续分级方法
Soil
Organic carbon
Dissolved organic carbon
Continuous grading method
