|| 要旨トップ | 目次 |||日本生態学会第64回全国大会 (2017年3月、東京) 講演要旨
一般講演（口頭発表） L01-07 （Oral presentation）
Habitat association is a central theme in tropical forest community ecology. Karsts, the jagged limestone hills in Southwestern China, create contrasting availability of edaphic resources across topography. Karst tree species show a strong habitat affinity to a particular topographic position. We examined how non-structural carbohydrate (NSC) concentrations in leaves, branches and roots vary across 13 common tree species specialising in four karst habitats during the dry season, and whether leaf NSC concentrations were related to other leaf traits. Soil moisture contents decreased with increasing elevation. Species in the hilltops had higher concentrations of simple sugars in leaves than those in lower slopes. But, no clear differences in the concentrations of starch in roots and branches were observed among habitat specialization types. Leaf sugar concentrations showed a strong positive correlation with leaf mass per area. High accumulation of leaf sugar and investment on leaf structural mass by hilltop species may affect adaptive strategies for dryer and nutrient poor habitats. Our findings provide some novel insights into niche assembly process and species coexistence in tropical forests at fine scale environmental gradients such as observed in tropical karst forests.