The present study aims to explore the spatial distribution and trends in rainfall, its seasonality and erosivity between 1971 and 2015 over the Suketi river catchment of lower Himachal Himalayas in India. Daily rainfall recorded at three stations in the catchment have been used for the computation of rainfall seasonality and erosivity by employing non-parametric indices say seasonality index, precipitation concentration index and modified Fournier index. The distribution maps have been prepared by applying the kriging technique of geographic information system. The results have indicated remarkable spatial and temporal variability in rainfall as well as in its seasonality and erosivity. Largely, the pattern of rainfall has been found unimodal (single wet season) and more than 95% area of the catchment have witnessed a marked seasonality and prevalence of very severe rainfall erosivity. However, the long-term annual rainfall erosivity has revealed a statistically non-significant decreasing trend. The highest values of rainfall erosivity have been observed in the month of July followed by August, June and September with lower reaches being the most vulnerable one. We have witnessed an absolute relationship between annual rainfall and modified Fournier index (R² = 0·999; p < 0·001), indicating that the spatial distribution of annual rainfall erosivity is intensely controlled by annual rainfall depth. Finally, it is hoped that the results of this study will assist farmers, agronomists and policy makers in chalking out best management practices for reducing soil erosion vulnerability not only for the Suketi river catchment but also for other identical catchments of the lower Himachal Himalayas.

本研究旨在探讨印度下喜马al尔喜马拉雅山苏克提河集水区在1971年至2015年之间的降雨，季节变化和侵蚀性的空间分布和趋势。流域三个站点记录的每日降雨量已通过采用非参数指数（例如季节性指数，降水集中度指数和修正的Fournier指数）来计算降雨的季节性和侵蚀力。应用地理信息系统的克里金法已经准备了分布图。结果表明，降雨以及季节和侵蚀力具有明显的时空变化。大部分，已经发现降雨模式是单峰的（单个雨季），流域面积的95％以上经历了明显的季节变化，并且普遍存在着严重的降雨侵蚀力。但是，长期的年降雨侵蚀力显示出统计上无明显下降趋势。在7月，随后是8月，6月和9月，观测到最高的降雨侵蚀力值，下游是最脆弱的月份。我们目睹了年降水量与修正的Fournier指数（六月和九月是最脆弱的地区，下游。我们目睹了年降水量与修正的Fournier指数（六月和九月是最脆弱的地区，下游。我们目睹了年降水量与修正的Fournier指数（R ²  = 0·999；p  <0·001），表明年降雨侵蚀力的空间分布受年降雨深度的强烈控制。最后，希望这项研究的结果将有助于农民，农艺师和政策制定者制定最佳管理方法，以减少水土流失的脆弱性，不仅针对苏克提河集水区，而且针对喜马拉雅山下游喜马拉雅山的其他相同集水区。