中文摘要：

以天宝岩长苞铁杉林的倒木-土壤系统为研究对象,采用因子分析方法与模糊评价方法,探讨分析倒木接触处土壤及空旷处土壤的肥力质量.结果表明：研究区长苞铁杉林分内倒木的覆盖有利于提高土壤肥力,其肥力指数随海拔降低呈下降趋势,且随腐烂等级的升高,土壤肥力指数升高,其中,第Ⅳ腐烂等级倒木接触处土壤肥力较邻近腐烂等级出现降低趋势;长苞铁杉＋猴头杜鹃林内倒木接触处土壤的肥力显著高于空旷地,长苞铁杉纯林内倒木接触处土壤的肥力指数低于空旷地土壤.研究揭示了倒木存在对森林土壤肥力质量的影响规律,可为后期在长苞铁杉林内开展倒木更新研究时的倒木选择与保留提供科学依据.

英文摘要：

Fuzzy mathematics and factor analysis were selected to study the relationship between fallen woods and soil fertility in the Tsuga longibracteata forest in Tianbaoyan National Nature Reserve, Fujian, China. The results showed that the surface mineral soil under fallen woods had higher soil fertility than forest floor soil, and the soil fertility index decreased with the decrease of elevation and increased with the increase of decay-classes, while the class IV were slightly lower than adjacent classes; soil fertility quality under fallen woods were significantly higher than forest floor soil fertility quality in T. longibracteata ＋ Rhododendron simiarum forest, and lower in T. longibracteata pure forest. This research revealed the influence law of fallen woods on soil fertility, and provided scientific basis for selection and retention of logs in the research processes of fallen woods in regeneration. Fig 2, Tab 5, Ref29