Effects of soil aggregate preparation methods on the stability and carbon sequestration potential evaluation
ZHENG Nan1,2, SHAO Yang2, LUO Min2, MENG Dan-yang1,2, XU Dian-dou2, LIU Zhi-ming1, MA Ling-ling2
1. State Key Laboratory of Chemical Resources Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Abstract：To investigate the effects of different soil agglomerate preparation methods on the evaluation of agglomerate stability and its carbon sequestration potential, soils were collected from two typical land utilization types-urban road soils and suburban agricultural soils in Beijing. The soil aggregate was prepared by dry sieving and wet sieving methods, respectively, and its composition, organic carbon content and stable carbon isotope were analyzed. The mechanically stable aggregates prepared by the dry sieving method were dominated by the large (>0.25mm) aggregates (urban road soils:69.80%; agricultural soils:71.36%). In contrast, the water-stable aggregates prepared by the wet sieving method were dominated by the micro (<0.25mm) aggregates (urban road soil:57.70%; agricultural soil:52.14%). Infrared spectrum analysis showed that irrespective of the different preparation methods, the relative content of stable organic carbon in micro aggregates was higher than that of active organic carbon for the two types of soils. For the arable soil in the suburbs of Beijing, the relative content of stable aromatic carbon was more, while the relative content of fatty carbon was less. In the case of urban greening soil, the opposite characteristics can be observed, indicating that organic carbon in urban greening soil has higher activity and is easy to be released under certain conditions. Combined with the analysis of stable carbon isotope ratio, it is found that 13C is enriched in the aggregate particle group smaller than 0.053mm prepared by the wet sieve method, which is more fitted the soil aggregate embryo development model, indicating that the wet sieve method has more practical evaluation value than the dry sieve method in the study of soil carbon sequestration potential. This study has reference significance for further evaluating the carbon sequestration potential of urban soils in China.
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