Keywords :
Clade-based Approach; Dipterocarpaceae; Dry Deciduous Forest; Minimum Leaf Conductance; Petiole
บทคัดย่อ :
Species composition varies greatly along with water availability gradients. In Northeast Thailand, dry deciduous forest (DDF) and dry evergreen forest (DEF) show contrasting species composition
due to differences in soil structure and moisture. Although plant traits (physiological and morphological characteristics) are known to be involved in species distributions, which traits
underpin these distinct distributions (either dry DDF or less-dry DEF) remain unclear. Here, we examined the differentiation of 21 leaf and stem traits between DDF and DEF, using 12
dipterocarp species. We found that DDF species showed higher water use efficiency and higher water storage capacity in the lamina and petiole, higher leaf nitrogen content, higher stomatal
density, larger leaves, thicker mesophyll layers, and a higher rate of water loss under severe dehydration than DEF species. Leaf osmotic potential at full turgor, wood density, and wood
water content were not significantly different between DDF and DEF. also observed a negative relationship between the potential photosynthetic capacity and the water loss rate during
severe dehydration across species. Our results suggest that the differences in leaf traits related to photosynthesis and dehydration avoidance cause a niche differentiation of the tree species along the soil water availability in tropical Dry Forest
เอกสารอ้างอิง :
Kawai, K., Waengsothorn, S., Leksungnoen, N., & Okada, N. (2021). Functional differentiation among 12 dipterocarp species under contrasting water availabilities in Northeast Thailand. Botany, 99(999), 1-15.
