土壤有机碳和无机碳耦合关系研究进展

干旱、半干旱地区土壤碳库由土壤有机碳(SOC)和无机碳(SIC)组成。由于土壤有机碳和无机碳之间存在耦合关系,有机碳含量变化可能会导致无机碳含量变化,反之亦然。过去农田土地管理和退耕还林等措施增加碳库侧重土壤有机碳,但是由于土壤有机碳和无机碳耦合关系机理尚不清楚,土壤有机碳增加可能对土壤无机碳造成的影响了解不足,不利于精确估算土壤碳汇变化情况。总结土壤有机碳和无机碳耦合关系情况,并从土壤有机碳向无机碳转移、土壤无机碳对土壤有机碳的保护作用等方面探究土壤有机碳和无机碳耦合机理,并提出未来研究需要加强的几个方面。

Research Progress of Relationship between Soil Organic Carbon and Soil Inorganic Carbon

In arid and semi-arid region,soil organic carbon (SOC) pool and soil inorganic carbon (SIC) pool are equally important component of soil carbon pool.Due to the relationship between soil organic carbon and soil inorganic carbon,the variation of SOC may affect the content of SIC,vice versa.In the foretime,land management of farmland,return farmland to forests and grassland usually emphasize to increase SOC content,but limited information was available about SIC result from the change of SOC.In a word,little was known about the relationship between SOC and SIC.It was unfavorable for accurate estimating potential carbon sink.The relationship between SOC and SIC was summarized.According to the transfer SOC to SIC and protective effect of SIC on SOC,the mechanism of the relationship between SOC and SIC was explored,and finally brought forward some suggestions relating the research of the relationship between SOC and SIC.