[目的] 研究甘蔗种植模式(新植、宿根)与植被覆盖度的空间分布对流域水文连通性的影响，为流域水文连通性研究及水土流失治理提供科学参考。 [方法] 以IC指数(index of connectivity)为水文连通性指标，基于ArcGIS以及无人机高分辨率影像数据，分析那辣小流域水文连通性随甘蔗生长期变化的特征，并利用主成分分析法探究水文连通性的关键影响因素。 [结果] ①那辣小流域IC均值随甘蔗生长期变化在-2.07~-2.87，苗期IC均值显著大于(p＜0.05)分蘖期、伸长期和成熟期，各子流域IC值随甘蔗生长期表现为先减小后增大和持续减小两种不同趋势，且在空间上越接近道路网或河道IC值就越高。 ②新植甘蔗IC值在苗期与分蘖期显著大于宿根甘蔗(p＜0.05)，在成熟期显著小于宿根甘蔗(p＜0.05)，但在伸长期无显著差异。 ③苗期、分蘖期和成熟期水文连通性影响因素主要为种植模式、植被覆盖度和坡度，且新植面积所占比例对水文连通性影响大于宿根面积所占比例。 ④新植甘蔗面积比例在苗期、分蘖期和成熟期显著影响了植被覆盖度，且随着生长期推移，其影响逐渐降低。甘蔗种植模式会通过影响植被覆盖度进而影响水文连通性。 [结论] 那辣小流域水文连通性随甘蔗生长期有显著变化，且受到种植模式和植被覆盖度的显著影响，其中种植模式可以通过影响植被覆盖度进而影响水文连通性。
[Objective] The effects of the spatial distribution of sugarcane planting patterns (newly planted and perennial) and vegetation coverage on the hydrological connectivity of a watershed were determined in order to provide a scientific reference for hydrological connectivity research and soil erosion management of watersheds. [Methods] Using the index of connectivity (IC), the variation characteristics of hydrological connectivity with sugarcane growing period were analyzed based on ArcGIS and UAV high-resolution image data. Principal component analysis was used to explore the key influencing factors of hydrological connectivity. [Results] ① The mean IC in the Nala watershed changed from -2.07 to -2.87 with increasing sugarcane growth stage, and the mean IC in the seedling stage was significantly greater than in tillering, elongation stage, and ripening stages (p＜0.05). The IC value of each sub-watershed showed two different trends: initially decreasing and then increasing, and continuously decreasing during the growth period of sugarcane. Places that were closer to the road network or river channel had higher IC values. ② The IC value of newly planted sugarcane was significantly greater than that of perennial sugarcane at the seedling and tillering stages (p＜0.05), and significantly lower than that of perennial sugarcane at the ripening stage (p＜0.05), but there was no significant difference at the elongation stage. ③ The main influencing factors of hydrological connectivity at the seedling, tillering, and ripening stages were planting mode, vegetation coverage, and slope, and the ratio of new planting area to hydrological connectivity was greater than that of perennial root area. ④ The area ratio of newly planted sugarcane significantly affected the vegetation coverage at the seedling, tillering, and ripening stages, and the effect gradually decreased with the passage of time. Sugarcane planting patterns affected hydrological connectivity by influencing vegetation coverage. [Conclusion] The hydrological connectivity of the Nala watershed changed significantly with sugarcane growth stage, and was significantly affected by planting patterns and vegetation coverage. Planting patterns can affect hydrological connectivity by influencing vegetation coverage.