生物炭添加对土壤呼吸和有机碳含量的影响

Effects of biochar application on soil respiration and soil organic carbon

以菜地和果园土壤为研究对象,通过室内培养实验,向土壤中分别添加不同材料制备的生物炭(马尼拉草、阔叶和竹叶),热解温度为350℃,研究不同材料制备生物炭添加对土壤呼吸和有机碳含量的影响。结果表明:不同生物炭施入土壤后,土壤CO2释放速率总的趋势是前期分解速率快,后期缓慢。在整个培养过程中(28 d),随着培养时间的延长,土壤CO2释放速率下降趋势逐渐降低。在不同土壤培养条件下,均是添加阔叶生物炭后土壤CO2-C累计释放增多,果园和菜地土壤CO2-C累计分别达到482.57和424.72 mg·kg-1。添加不同的生物炭均能提高土壤有机碳含量,但只有添加阔叶生物炭之后,差异才会达到显著(P<0.05)。研究结果为正确利用生物炭和评价其在土壤碳库作用提供科学依据。

In order to study the effects of different biochar materials on soil respiration and soil organic carbon （SOC）, we selected different biochar materials,which were produced by charring the grass,broad leaf and bamboo leaf under the temperature of 350 ℃.Biochar was mixed with two soils （garden soil and orchard soil）separately,and incubated for 28 d at 25 ℃.The results indicated that the soil CO2 emission rate in different treatments was quicker at the early stage of incubation,and became slower in the later phase.Under the same temperature condition,the accumulation a-mounts of soil CO2-C were increased by biochar application.The accumulation amounts of soil CO2-C were increased to 482.57 mg·kg-1 and 424.72 mg·kg-1 in orchard soil and garden soil.SOC and pH were also increased due to bio-char application.However,a significant difference was only found with broad leaf biochar application.These findings would be helpful to understand the role of biochar in soil carbon cycle.