为探明不同耕作措施对滨海盐渍土耕层土壤有机碳含量和团聚体特征的影响，本研究在江苏省东台市滨海滩涂农田区开展田间试验，选择玉米-大麦的旱-旱轮作方式，采用传统翻耕、深翻、少耕和免耕4种耕作方式，分别对耕层土壤的有机碳含量、土壤体积质量(容重)、水稳性团聚体含量和稳定性进行测定。结果表明：与传统翻耕相比，免耕措施利于促进土壤有机碳的积累，免耕能使土壤有机碳含量增加18% ~ 32%；少、免耕措施能使0 ~ 10 cm土层>0.25 mm团聚体增加10% ~ 31%，并且能显著增加0 ~ 20 cm土层土壤平均重量直径和几何平均直径值；团聚体中有机碳含量表现为，除0.25 ~ 0.5 mm团聚体外，在>5 mm至0.5 ~ 1 mm粒径之间，粒径愈小，有机碳含量愈高。

TTo disclose the effects of different tillage systems on the contents of soil organic carbon and aggregate properties, a field experiment was conducted in the costal saline soil region, Dongtai City of Jiangsu Province. Four tillage systems were adopted: conventional tillage (CT), deep tillage (DT), minimum tillage (MT) and no tillage (NT), soil organic carbon, bulk density and water-stable aggregates were measured. The results showed that compared with CT, NT treatment had significant effects on SOC content, the range was 18% – 32%. Water-state macro-aggregate contents of MT and NT were higher than other treatments by 10% – 31%, the MWD and GMD values of soil aggregates at 0 – 20 cm layer of MT and NT were significantly improved. Distribution of the soil organic carbon in aggregates was found to be that in aggregates varying from 0.5–1 mm to > 5 mm in particle size, the smaller the aggregates, the higher the soil organic carbon content therein.

S153.6; S152.4

国家自然科学基金项目(41171181、51109204)、江苏省产学研前瞻性联合研究项目(BY2013062)和江苏省自然科学基金项目(BK2011425)资助