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การเปิดปากใบในรอบวันของพรรณไม้ที่ตอบสนองต่อสภาพอากาศในเขตเมือง บริเวณอุทยาน 100 ปี จุฬาลงกรณ์มหาวิทยาลัย |
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| รหัสดีโอไอ | |
| Creator | ณัตฑิตา พรมจวง |
| Title | การเปิดปากใบในรอบวันของพรรณไม้ที่ตอบสนองต่อสภาพอากาศในเขตเมือง บริเวณอุทยาน 100 ปี จุฬาลงกรณ์มหาวิทยาลัย |
| Contributor | นิสา เหล็กสูงเนิน, พันธนา ตอเงิน |
| Publisher | Thammasat University |
| Publication Year | 2562 |
| Journal Title | Thai Journal of Science and Technology |
| Journal Vol. | 8 |
| Journal No. | 4 |
| Page no. | 386-397 |
| Keyword | Diurnal Stomatal Conductance, Leaf-to-Air Vapor Pressure Deficit, Urban Trees |
| URL Website | https://www.tci-thaijo.org/ |
| Website title | THAIJO |
| ISSN | 2286-7333 |
| Abstract | Urban environments are different from those in native habitats of tree species resulting in the different responses to those conditions. This study focused on characterizing the responses of tree species to urban environments at the Chulalongkorn University Centenary Park by measuring leaf stomatal conductance of five tree species with the most important value index species (IVI) including Dalbergia cochinchinensis, Millingtonia hortensis, Tabebuia rosea, Samanea saman, and Dipterocarpus alatus, respectively. The stomatal conductance was measured every 2 hours from 7:00 A.M. to 5:00 P.M. in the dry season (April-May, 2018) and the rainy season (August-September, 2018), each with three replicates (days). The diurnal patterns of stomatal conductance of all species were similar in both seasons, increasing in the early morning and gradually decreasing in the afternoon. Stomatal conductance in the rainy season was significantly higher than that in the summer season (p <0.0001). In most species, the relationships between the stomatal conductance and leaf-to-air vapor pressure deficit (LAVPD) were inversely linear, indicating stomatal closure at high transpirational gradients. The slope of the linear relationship in each species was significantly different across seasons (p <0.0001). LAVPD value in the summer season was higher than that in the rainy season, resulting in steeper slopes in S. saman, D. cochinchinensis and M. hortensis. However, in the rainy season, the slopes were positive in all species, except D. cochinchinensis which had no relationship between LAVPD and stomatal conductance. |
