农业环境科学学报2017，Vol.36Issue(9)：1820-1828,9.DOI:10.11654/jaes.2017-0124
生物炭对北京郊区砂土持水力和氮淋溶特性影响的土柱模拟研究
Effects of biochar on water holding capacity and nitrogen leaching of sandy soil column from a Beijing suburb
摘要
Abstract
A soil column experiment was conducted to examine the effects of biochar application on leachate volume and leaching of N. Sandy soil(0～90 cm in depth)was collected in a Beijing suburb via stratified sampling. And then, the sandy soil was filled in Plexiglas pipes based on the in situ soil bulk density and moisture content of each soil layer. Biochar was homogenized into the topsoil(0～20 cm)at rates (W/W)of 0％, 0.5％, 1％, 2％, and 4％. A conventional dose of N fertilizer(0.56 t N·hm-2)was also added into the topsoil of each soil col-umn. Deionized water was dropped into the soil columns, and the irrigation amount was based on the average annual rainfall of Beijing (616.6 mm). The results showed that, with increasing biochar concentration, the cumulative leachate volume and leaching of total N de-creased by up to 41.3％and 22.7％, respectively, compared with the nil biochar addition treatment, after nine leaching events. The total N concentration of the topsoil increased significantly(P<0.05), by up to 158％, after biochar addition. The amount of inorganic N retained in the soil column after the total leaching was 19.5％～91.9％ more for the biochar addition treatment than for the control. In addition, biochar addition decreased cumulative leaching of dissolved organic carbon, by up to 22.8％. The pH value and electrical conductivity of the leachates increased with increasing biochar concentration, and the topsoil retained higher moisture content following addition of greater biochar amount during the 9 times leaching. Correlation analysis indicated that cumulative leaching of total N positively correlated to leachate volume(r=0.978, P<0.01), but not to total N concentration of the leachate. Biochar addition could improve the water holding ca-pacity of the sandy soil Beijing suburb and retard the down migration of water and nitrogen, thereby reducing leaching loss of water and ni-trogen, improving their use efficiency, and mitigating the risk of nitrogen contamination of groundwater.关键词
生物炭/沙化/砂土/氮淋溶/持水量Key words
biochar/land desertification/sandy soil/nitrogen leaching/water holding capacity分类
资源环境引用本文复制引用
王燕,庞卓,贾月,王庆海,刘文菊,谢祖彬,郑瑞伦..生物炭对北京郊区砂土持水力和氮淋溶特性影响的土柱模拟研究[J].农业环境科学学报,2017,36(9):1820-1828,9.基金项目
国家自然科学基金青年科学基金项目(41501336) （41501336）
北京市优秀人才培养资助项目(2015000020060G141) （2015000020060G141）
公益性行业(农业)科研专项(201503106) （农业）
北京市科技计划课题(D151100005915002) The Young Scientists Fund of the National Natural Science Foundation of China(41501336) （D151100005915002）
Beijing Outstanding Talent Training Project (2015000020060G141) （2015000020060G141）
The Special Scientific Research Fund of Agricultural Public Welfare Profession of China(201503106) （201503106）
Beijing Science and Technology Planning Project(D151100005915002) （D151100005915002）
