中国草地学报2025，Vol.47Issue(2)：48-55,8.DOI:10.16742/j.zgcdxb.20240147
放牧干扰下荒漠草原建群种短花针茅种子扩散与种子库形成影响因素研究
Factors Influencing Seed Dispersal and Seed Bank Formation of Stipa breviflora in Desert Steppe under Grazing Disturbance
摘要
Abstract
This study investigated the effects of grazing on the seed dispersal and soil seed bank dynam-ics of Stipa breviflora,a constructive species in desert grasslands.The experiment employed a grazing gra-dient(including a grazing prohibition control)and measured several key variables within sample plots:veg-etation cover,surface litter biomass,reproductive branch height of Stipa breviflora,and seed dispersal.Simulated rainfall experiments were conducted to assess the influence of precipitation on seed burial rate.The experimental design aimed to identify key factors influencing seed dispersal and incorporation into the soil seed bank under grazing disturbances.The results showed as follows:(1)Grazing intensity negatively affects seed quantity,increasing grazing intensity resulted in a decrease in seed number.(2)Seed dispersal was characterized by small-scale,localized dispersal.A significant positive correlation was observed between Stipa breviflora seed dispersal and reproductive branch height(P<0.05).(3)Soil moisture con-tent influenced the seed burial rate of Stipa breviflora,particularly within the 0-5 cm soil layer.A signifi-cant regression relationship was found between soil moisture in this layer and burial rate(P<0.05).关键词
放牧强度/短花针茅种子/扩散/种子埋藏率Key words
Grazing intensity/Stipa breviflora seeds/Dispersal/Seed burial rate分类
农业科技引用本文复制引用
陈奕霏,镡建国,庄玲,唐佳明,杨佳川,吴水欣,孙世贤,郭月峰..放牧干扰下荒漠草原建群种短花针茅种子扩散与种子库形成影响因素研究[J].中国草地学报,2025,47(2):48-55,8.基金项目
国家自然科学基金青年科学基金项目(32101449) （32101449）
内蒙古自治区技术攻关项目(2021GG0056) （2021GG0056）
内蒙古自治区揭榜挂帅项目(2024JBGS0011) （2024JBGS0011）
