黑碳添加对土壤碳矿化及有效养分的影响

Effects of Black Carbon Addition on the Soil Carbon Mineralization and Available Nutrients

为了研究不同热解温度制备的黑碳对土壤有机碳矿化及土壤养分的影响,以杉木凋落物为生物质在300-700℃下制备黑碳,分别将不同温度制备的黑碳添加到人工杉木林土壤中,进行为期28 d的室内培养。结果表明：土壤CO2的释放速率呈现前期（0-3 d）快和后期（3-28 d）慢的变化趋势。不同处理的土壤CO2-C累积量基本随着制备温度的升高而增加。培养结束时,同未施黑碳的对照土壤相比,黑碳添加处理的土壤有机碳、速效磷、速效钾以及p H均显著提高,而土壤碱解氮含量则有所下降,但统计上未达显著水平。本研究可为今后更好地利用黑碳减少森林土壤碳排放以及提高土壤肥力提供科学依据。

The aim of this study was to investigate the effects of black carbon（ BC） addition on soil organic carbon（ SOC） mineralization and soil nutrients. BC was produced by pyrolysis of Cunninghamia lanceolata litter in the laboratory at nine temperatures（ 300- 700℃）. Soil was mixed with BC material and incubated for 28 days. The results indicated that the soil CO2 emission rate was higher at the earlier stage of incubation（ 0- 3 d）,and became slower in the later phase（ 3- 28 d）. The accumulation amounts of soil CO2-C were increased with temperature increase.Compared to control soil,there was a significant increase in soil organic carbon,available P,available K and soil p H with BC additions treatment,but a small decrease in soil available N. This paper can provide the scientific information for BC application in reducing forest soil carbon emission and increasing soil fertility.