Abstract: In order to explore the effects of tobacco‑rice continuous cropping years on aggregates stability of purple paddy soil，the purple paddy soil from purple hilly areas of Southern China，with no tobacco planted and rice‑rice continuous cropping for at least 5 years，was used as the control（CK），the tobacco planting soils were sampled to explore the effects of tobacco‑rice continuous cropping years（0—5 a，5—10 a，10—15 a，15—20 a，>20 a）on soil aggregates distribution and aggregates stability as well as its key influencing factors，based on the means of spatio‑temporal substitution，correlation analysis and redundancy analysis.The results showed that the content of >5 mm soil aggregates during the 0—5 a and 5—10 a of tobacco‑rice continuous cropping years was decreased by 26.71% and 24.35% respectively；the mean weight diameter（MWD） and geometric mean diameter（GMD） of soil aggregates were significantly decreased by 19.33% and 30.64% respectively after 0—5 years of tobacco‑rice continuous cropping，after 5—10 years of tobacco‑rice continuous cropping MWD and GMD were significantly decreased by 20.17% and 34.04% respectively，the fractal dimension increased significantly，and the stability of soil aggregates decreased.Correlation and redundancy analyses revealed that the contents of soil organic matter，total nitrogen，total phosphorus，gravel sized for 1—2 mm and clay sized for <0.002 mm were the key indexes inducing variation of soil aggregates distribution；the content variation of soil organic matter，total phosphorus，gravel sized for 1—2 mm and clay sized for <0.002 mm，induced the formation or destruction of soil >5 mm aggregates，which resulted in the changes of soil aggregates stability.Therefore，the effects of tobacco‑rice continuous cropping on the distribution and stability of soil aggregates in purple paddy soil are mainly concentrated in the continuous cropping years of 0—5 a and 5—10 a，and more attention should be paid to soil structure cultivation and soil quality conservation of this continuous cropping period.

Key words: Purple paddy soil, Tobacco?rice multiple cropping, Continuous cropping year, Soil aggregate, Redundancy analysis

摘要： 为探究烟稻复种连作年限对紫色水稻土团聚体稳定性的影响，以南方紫色丘陵区未植烟且稻稻连作5 a及以上的紫色水稻土为对照（CK），以研究区烟稻复种连作的紫色水稻土为对象，采用时空替代法、相关及冗余分析等方法，研究了烟稻复种连作年限（0~5 a、5~10 a、10~15 a、15~20 a、>20 a）对紫色水稻土团聚体及其稳定性的影响，并探索其关键影响因素。结果表明，紫色水稻土烟稻复种连作0~5 a和5~10 a，>5 mm的大团聚体含量分别降低26.71%和24.35%；烟稻复种连作0~5 a的土壤团聚体质量平均直径（MWD）和几何平均直径（GMD）分别显著降低19.33% 和30.64%，烟稻复种连作5~10 a的MWD、GMD分别显著降低20.17%和34.04%，分形维数显著升高，土壤团聚体稳定性降低。相关及冗余分析表明，土壤有机质、全氮、全磷、1~2 mm的石砾和<0.002 mm的黏粒含量是影响团聚体分布的关键指标；烟稻复种连作土壤有机质、全磷、1~2 mm石砾及<0.002 mm黏粒含量的变化，引起了>5 mm团聚体的形成或破坏，从而导致土壤团聚体稳定性变化。综上，烟稻复种连作对紫色水稻土团聚体分布及稳定性影响主要集中在复种连作0~5 a和5~10 a土壤上，需重视该烟稻复种连作年限段的土壤结构培育和土壤质量保育。

关键词: 紫色水稻土, 烟稻复种, 连作年限, 土壤团聚体, 冗余分析