摘要
添加生物质炭至土壤中进行室内培养试验,模拟研究生物质炭在土壤环境中的降解特征。结果表明:生物质炭在土壤环境中有较高的稳定性,其降解的半衰期约为玉米秸秆等普通植物生物质的20多倍,但生物质炭在土壤中的稳定性低于活性炭;生物质炭的稳定性与其本身的化学组成有关,随含碳量的增加而增加;淹水条件比非淹水条件下生物质炭具有更高的稳定性,说明在水田中施用生物质炭更有利用于土壤碳的固定,具更高的增碳效果;由生物质炭引入的黑碳物质在土壤中随培养时间的延长,其颗粒逐渐变小,由轻组分逐渐向重组分转化。
An incubation experiment over three years was conducted to investigate the effects of water regimes （unsaturated and alternating saturated-unsaturated conditions） and differences in black carbon （BC） materials, produced by carbonizing corn residues and bamboo at different temperatures （300, 450, and 600 ＊C ） on biochar-C degradation. Changes of residual biochar materials in the incubated soil under different conditions were characterized. The results showed that the biochar materials in the soil were very stable. The half-life time of the biochar materials was about 20 times higher than that of corn stalk material, but it was lower than that of activated carbon. The stability of the biochar materials in the soil was related to the chemical compositions of the biochar materials, and increased with increasing C contents in the added materials. The stability was higher under the alternating water-saturated- unsaturated conditions than under water-unsaturated condition, which suggested that paddy soil had more benefit condition to fixation of carbon sequestration. As duration of the added biochar in the soil increased, distribution of black carbon from the biochar materials in the soil was gradually transformed from coarse particle into fine one, and from light fractions into heavy ones. These results are of practical value to those considering biochar as a tool for atmospheric C sequestration.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2012年第3期329-335,共7页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金资助项目(40771090
40471064)
浙江大学曹光彪高科技发展基金资助项目(2008RC007)
