摘要
为探讨杉木生物炭输入到土壤中后对土壤碳、氮矿化的影响和机制,通过室内培养实验,研究了单独施用生物炭、凋落物及其配合施用下土壤碳、氮矿化的特征以及可溶性有机碳(DOC)和微生物生物量的变化。结果表明,生物炭单独施用或与凋落物同时添加到土壤中,均增加了土壤有机碳含量且抑制了土壤有机碳和/或凋落物的矿化。生物炭对DOC的吸附效应导致土壤可利用态碳显著降低,且单独添加生物炭后,土壤微生物生物量碳含量在培养初期显著降低,故这种吸附效应可能是生物炭抑制土壤有机碳矿化的重要原因之一。生物炭单独添加到土壤中在培养结束后(90 d)并未改变土壤氮的矿化量,但在培养过程中,却降低了土壤氮的矿化;然而,无论是否存在生物炭,添加凋落物均显著降低了土壤氮的矿化并增加了微生物生物量氮。这说明,无凋落物存在的情况下,生物炭的固氮效应呈现出短期效应。
To explore the effects of biochar on mineralization of soil organic carbon and nitrogen, alaboratory incubation pot experiment was conducted. Overall four treatments viz a viz（a）soil,（b）soil ＋biochar,（c）soil＋biochar＋ litter,（d）soil＋litter were provided to study the characteristics of the release of carbon dioxide and soil mineral N; as well as the changes in microbial biomass and dissolve organic carbon.The results showed that compared with control soil, the addition of biochar to soil with or without litter suppressed the mineralization of native soil organic carbon and/or litter-C. The adsorption of DOC by biochar significantly reduced the available carbon for soil microbial biomass carbon. Biochar alone added to the soil at the end of the incubation did not changed the soil N mineralization but reduced soil N mineralization in the process of incubation.However, addition of litter to soil with or without biochar significantly reduced soil N mineralization and increased the microbial biomass nitrogen. It was concluded that biochar have short term effect for nitrogen conservation of soil in the presence of litter.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2017年第2期314-321,共8页
Journal of Agro-Environment Science
基金
国家科技支撑计划项目(2015BAD09B010102)
国家自然科学基金项目(31400465)
福建农林大学科技发展基金项目(KF2015036)~~
关键词
杉木
生物炭
凋落物
人工林土壤
矿化
碳氮
Chinese fir
biochar
litter
plantation soil
mineralization
carbon nitrogen
作者简介
李莹（1986-），女，博士研究生，主要从事生物炭对土壤碳循环方面的研究。E-mail：407541808@qq．com
通信作者：马祥庆E-mail：lxymxq@126．com
