臺灣產薹屬（莎草科）植物功能形質與土壤濕度梯度之間的關係：以鴛鴦湖為例

The relationship between functional traits of Carex (Cyperaceae) species and soil moisture gradient: a case study of Yuanyang Lake

物種與環境間具有交互的關係，物種為適應不同環境類型，衍生之功能形質與此有關，因此一般高歧異度之樓地具多樣性的種類與形態。故本研究以鴛鴦湖湖泊至森林下層之薹屬植物作為研究對象，在鴛鴦湖地區以目標取樣法對薹屬植物進行採樣，並量測環境因子，使用歸群分析及梯度分析對薹屬植物的樣本進行功能形質分群、環境與功能形質的關係探討。結果顯示鴛鴦湖地區的6種薹屬植物各有不同的功能形質趨勢，適應鴛鴦湖多樣的棲地並形成土壤濕度梯度，且功能形質多樣性高，薹屬植物的生長策略也隨濕度梯度變化形成功能形質梯度。另外，鴛鴦湖湖域周圍之單穗薹，可能具有特殊的生長策略以適應鴛鴦湖的水位變化。

There exists an interactive relationship between species and their environment in which different functional traits would evolve for species to adapt to different environments. This in turn results in a significant species and morphological diversity while an obvious environmetal gradient exists. We investigated the relationship between functional traits of Carex (Cyperaceae) species and soil moisture gradient by conducting a case study at Yuanyang Lake. Target sampling method was used to collect understory samples of Carex species and environmental factors were measured at Yuanyang Lake. Cluster analysis of Carex species was conducted for grouping functional traits and gradient analysis was applied to explore the relationship between specific functional traits and environment variables. The result showed that six Carex taxa at Yuanyang Lake had different trends in functional trait and functional diversity. Each Carex taxon not only adapted to specific habitats by its functional traits and formed a soil moisture gradient, but also revealed an evident functional gradient along the soil moisture conditions. Furthermore, our research found Carex capillacea along the lakeshore had growth strategies to suit water level change.