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通过对沈阳市郊玉米连作土壤的有机质、结构情况以及二者相互关系研究表明,土壤中有机质大致范围在16.31gkg-1～23.72gkg-1,腐殖质大致范围在15.17gkg-1～21.49gkg-1,非腐殖质大致范围在1.14gkg-1～2.59gkg-1;在腐殖质各组分中,胡敏素的含量最高,约占腐殖质总量的58.93%～66.34%,胡敏酸约占16.26%～22.87%,富里酸约占16.82%～18.20%,胡富比约在0.95～1.32之间;干筛处理后>0.25mm的土壤团聚体占到80%以上,其中以>2mm团聚体为主,湿筛处理后>0.25mm的土壤团聚体仅占20%左右,其中0.25～0.5mm团聚体为主,水稳性系数在17.33%～35.67%。对有机质及其各组分与土壤各级团聚体做的相关分析结果表明,有机质与0.25～5mm粒径组的团聚体呈显著相关,与>5mm团聚体不相关,且胡敏酸主要影响1～5mm大团聚体的形成。
The results showed that soil organic matter generally ranged from 16.31gkg-1 to 23.72gkg-1, humus ranged from 15.17gkg-1 to 21.49gkg-1, and soil organic matter, The content of humic substance was in the range of 1.14gkg-1 ~ 2.59gkg-1. Among the humus constituents, the content of humin was the highest, accounting for 58.93% ~ 66.34% of the total humus and 16.26% ~ 22.87% Fulvic acid accounted for about 16.82% ~ 18.20%, Hu Fu ratio of about 0.95 to 1.32; dry sieve treatment> 0.25mm soil aggregates accounted for more than 80%, of which> 2mm aggregates mainly wet sieve treatment After> 0.25mm soil aggregates accounted for only about 20%, of which 0.25 ~ 0.5mm aggregates dominated, water stability coefficient of 17.33% ~ 35.67%. The results of correlation analysis between organic matter and its aggregates and soil aggregates at all levels showed that there was a significant correlation between organic matter and aggregates in 0.25-5 mm size group and not associated with> 5mm aggregates, with humic acid mainly affecting 1 ~ 5mm formation of large aggregates.