【摘要】 对云南北部的泥石流多发干旱河谷区不同干扰状况下的土壤种子库特征进行了研究。结果表明不同形式的干扰对土壤种子库特征产生不同形式的影响。人工种植合欢 (L eucaena glauca)并屏除人和家养动物的影响使土壤种子库的种子密度增大 ,同时种子组成也由原来的耐旱型为主变为耐荫型为主 ;马桑 (Coriaria sinica)种植并实行年度砍伐降低了种子密度并减少了种子种类 ,但主成分的性质未发生改变 ;滑坡与水土流失将很多种子带入其坡积物中 ,从而降低土壤种子库密度与组成种类 ;泥石流是破坏地表土壤层和土壤种子库的最主要因素。更多还原

【Abstract】 Soil seed banks of different ecosystems subject to different disturbances were studied in a dry valley prone to debris flow in Northern Yunnan. It was found that variation in the type of disturbance had a strong effect on the density and composition of the soil seed bank. Restoration with a Leucaena glauca plantation(with over 6 years free of disturbance from humans or domestic animals) increased the seed bank density and the dominant species changed from aridity-tolerant to shade-tolerant species. Seed bank density and the variety of species was reduced in an annually cut Coriaria sinica plantation, though the composition of the seed bank remained constant. Landslides and soil erosion had a negative effect on seed bank density and species types as many seeds were removed from the soil. Debris flow created the greatest disturbance as it destroying both the soil surface and seed bank.更多还原