对广西桂林晚泥盆世弗拉期-法门期(Frasnian-Famennian,简称F-F)之交杨堤剖面的碳酸盐岩碳同位素、生物成因Ba、Al、Si和氧化还原指标的综合分析,表明该地区F-F之交生产力较低,且两次Kellwasser事件具有不同特点:下Kellwasser(LKW)事件时期并未出现明显缺氧环境,生态系统中初级生产力和最终生产力均相对较高,δ13 C小幅度正偏是由生产力上升引起;上Kellwasser(UKW)事件时期海平面上升,陆源输入物极少,氧含量急剧下降,初级生产力有所增加,最终生产力锐减,此时的δ13 C大幅正偏是由于缺氧条件下有机碳缓慢积累埋藏保存所致. A comprehensive analysis of carbonate carbon isotopes, biogenic Ba, Al, Si and redox indices of the Yangdi section at the Frasnian-Famennian (FF) section of the Late Devonian in Guilin, Guangxi Province indicates that The productivity of FF was low in this area, and the two events of Kellwasser had different characteristics. The obvious hypoxic environment did not appear during the event of Kellwasser (LKW), the primary and final productivity of ecosystem were relatively high, Positive bias is caused by an increase in productivity; during the events of Kellwasser (UKW), sea level rise, ground-level inputs were minimal, oxygen content dropped sharply, primary productivity increased, and final productivity dropped sharply. Due to the slow accumulation of organic carbon under hypoxic conditions, due to the preservation of the buried.