不同培养条件下生物炭对磷吸附解吸能力的影响

将350℃和600℃2种不同裂解温度下的芦苇秸秆生物炭作洗涤和未洗涤处理后,与巢湖十五里河河口湿地土壤进行网隔培养,培养的水分处理分为:淹水、干湿交替和75%田间持水量,共得到12个样品。对培养后生物炭进行磷素吸附-解吸实验,采用Langmuir和Freundlich吸附模型分析处理3种水分培养后的生物质炭对磷的吸附-解吸差异。结果表明:吸附量均随磷平衡浓度的增加而增大,且淹水的吸附量远远大于75%田间持水量。Langmuir和Freundich方程均能很好地描述12种不同处理的生物质炭对磷的等温吸附过程。淹水的各个拟合参数均高于干湿交替和75%田间持水量。解吸量均随添加磷浓度的增大而增大,解吸率随添加磷浓度的增加而减少。淹水的解吸量和解吸率均高于干湿交替和75%田间持水量。

Effects of Biochar on Ability of Adsorption and Desorption of Phosphorus under Different Culture Conditions

the reed stalk bio carbon under two different pyrolysis temperatures at the temperature of 350℃ and 600℃ was used for treatment of washing and unwashed, then carried on an net isolated culture with the wetland soil of Chaohu 15 Mile Estuarine, it obtained 12 samples by water treatment of culture such aswaterlogging, dry wet alternation and 75% field water capacity. The experiments were carried out to study the difference in adsorption and desorption of phosphorus in 3 kinds of water cultured biomass by Langmuir and Freundlich adsorption model. The results showed that the adsorption capacity increased with the increase of phosphorus concentration, and the adsorption capacity of waterlogging was much larger than75% field water capacity. Both Langmuir and Freundich equation can well describe the isothermal adsorption process of phosphorus by 12 different treatments of biomass carbon.The fitting parameters of waterlogging were higher than those of dry wet alternation and 75% field water capacity. The desorption amount increased with increased of phosphorus concentration, the desorption rate decreased with the increased of phosphorus concentration. Desorption and desorption rate of waterlogging were higher than 75% field water capacity and dry wet alternation.