YOU Junjian,XIE Kaixuan,SUN Lei,et al.Influence of Sewage Sludge Biochar Application on Mineralization of Organic Carbon of Sandy Soil in the Yudong Plain[J].Research of Soil and Water Conservation,2019,26(06):12-17.
城市污泥生物质炭对豫东黄泛平原风沙土耕地土壤有机碳矿化影响
- Title:
- Influence of Sewage Sludge Biochar Application on Mineralization of Organic Carbon of Sandy Soil in the Yudong Plain
- 分类号:
- S156.5
- 摘要:
- 为探讨城市污泥生物质炭对风沙土耕地作物产量、土壤有机碳及其矿化的影响，采用田间定位试验，设置5个处理，分别为20（B20），40（B40），60（B60）t/hm2生物质炭、无机肥（NPK）、对照（CK），以一级动力学理论为基础，对5个处理的土壤样品进行了室内培养试验。结果表明：（1）与CK相比，不同施量生物质炭处理较CK产量提高了21.30%，51.88%，41.06%，有机碳含量提高了18.30%，21.84%，29.62%。（2）不同处理土壤有机碳矿化速率随培养时间的动态变化特征呈对数函数关系，培养初期矿化速率先上升，之后迅速下降，最终趋于稳定，培养49 d后，NPK处理土壤有机碳累积矿化量最高，达到645.50 mg/kg，B40，B60次之，为449.53，401.33 mg/kg。（3）风沙土土壤有机碳矿化动态变化可以用一级动力学方程拟合，供试土壤潜在有机碳矿化库（Cp）和矿化速率常数（k）较高，分别为0.26~0.66 g/kg和（0.008 6~0.013 4）/d，与CK处理相比，B40，B60，NPK处理土壤有机碳矿化率提高55.93%~150.37%。上述结果显示豫东黄泛平原风沙土施用生物质炭可以提高土壤有机碳含量，对比NPK处理，减小了土壤有机碳累积矿化量、矿化率，增强土壤固碳能力，以40 t/hm2处理的效果更佳。研究结果可为豫东黄泛平原风沙土土壤碳储量增加、城市污泥的资源化利用提供科学依据。
- Abstract:
- In order to explore the effects of biochar on peanut yield, soil organic carbon and carbon mineralization dynamics, a field experiment was conducted. The experiment included 5 different treatments:biochar rates at 20 t/hm2 (B20), 40 t/hm2 (B40) and 60 t/hm2 (B60), inorganic fertilizers (NPK), the control (CK). The organic carbon mineralization was measured under the laboratory soil incubation experiment on the basis of the theory of soil organic carbon. The results showed that:(1) different application rates of biochar could significantly increase peanut yield and soil organic carbon by 21.30%, 51.88%, 41.06% and 18.30%, 21.84%, 29.62%, respectively; (2) the changes of soil organic carbon mineralization rate of each treatment followed the logarithmic relationship; the mineralization rate of soil organic carbon in each treatment increased first at the initial stage of incubation, then decreased rapidly and stabilized finally; after 49 days of incubation, the highest cumulative CO2 emission occurred in the NPK treatment (645.50 mg/kg), followed by B40 (449.53 mg/kg) and B60 (401.33 mg/kg); (3) the dynamics of SOC mineralization preferably followed the first order kinetics, the values of both Cp and k of all treatments were high, Cp ranged from 0.26 g/kg to 0.66 g/kg, and k ranged from 0.008 6 to 0.013 4 per day; compared with CK treatment, the soil organic carbon mineralization rates of B40, B60 and NPK treatment significantly increased (55.93%~150.37%). The above results indicated that the application of biochar to sandy soil in Yudong Plain could increase soil organic carbon, decrease cumulative CO2 emission and mineralization rate of soil organic carbon, and enhance soil carbon fixation capacity. This study can provide the scientific basis for improving soil carbon pool and the utilization of sewage sludge.
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备注/Memo
收稿日期:2018-12-02;改回日期:2019-03-03。
基金项目:水利部淮河水利委员会"淮河流域黄泛区风力侵蚀定位观测项目"（HWSBC2016037）
作者简介:尤俊坚(1990-),男,江苏南京人,博士研究生,研究方向为生物质炭对风沙土的改良。E-mail:junjian_you@163.com
通讯作者:刘霞(1971-),女,山东菏泽人,博士,教授,博士生导师,主要从事水土保持监测与评价研究。E-mail:liuxia@njfu.edu.cn