Structural Features of Humic Substances as Biogeochemical Proxies for Soil Carbon Stabilization and Ecosystem Functions

摘要：

　　Recent literature on the long-term accumulation of soil organic matter (SOM) has overemphasized the importance of preservation factors.Often such research has neglected the role of the peculiar composition of humic substances (HS) in SOM resilience.In the present communication,we intended to justify and underline the importance of HS structure as a source ofbiogeochemical proxies for C stabilization,and its causal connection with C residence time in the soil ecosystem.Three important empiric and experimental issues were considered:i)molecular-level analysis of SOM evidencing its biogeochemical stability in connection to its chaotic three-dimensional structure not readily amenable to enzymatic degradation,ii) structural laboratory transformations of model HS exerting a measurable effect on their biodegradability,and iii) empirical approaches based on multivariate data treatments taking advantage from the natural variability of the SOM,betraying significant local patterns of structural humic resilience proxies.

关键词： Humic substances Soil carbon sequestration Selective preservation Molecular complexity Humification processes

作者: F.J.González-Vila G.Almendros J.A.González-Pérez Z.Hernández H.Knicker A.Piedra-Buena J.M.de la Rosa

作者单位: IRNAS-CSIC.Avda.Reina Mercedes,10,41012 Seville,Spain MNCN-CSIC.Serrano 115B E-28006 Madrid,Spain Department of Analytical Chemistry,University of La Laguna,38206 La Laguna,Spain

会议类型: 国际会议

会议名称: the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))

会议地点: 杭州

会议语种:英文

页码: 218-220

在线出版日期: 2012-09-09（万方平台首次上网日期，不代表论文的发表时间）