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Stomatal Number and Size of Ornamental Dicotyledons Plant in Pontianak West Kalimantan

Greening in an urban area is a very important role in regulating temperature around. However, not all plants provide the same level of cooling. Cooling environmental temperature can be influenced by transpiration. This study aimed to measure the transpiration rate of dicotyledon plants. The method was a factorial Completely Randomized Design (CRD) with the main factors six dicotyledon species and three plant parts namely the top, middle, and bottom parts of the lowest plant branches with five replications. The data were analyzed using SAS. If the treatments were significant it was followed by the LSD test. The plant species and plant part significantly influenced the transpiration rate; however, the combination of the two did not significantly affect. The highest transpiration rate occurred significantly in Syzygium oleana R.Br (0.013080 gr.cm2.hour) whereas the lowest transpiration rate occurred in Codiaeum variegatum Bl. (0.004147 gr.cm2.hour). The bottom part of the plants (0.009933 gr.cm2.hour) had the highest transpiration rate significantly compared to the middle (0.009633 gr.cm2.hour) and the top (0.007577 gr.cm2.hour). The highest transpiration rate in Syzygium oleana R.Br, as well as the bottom part of the plants, had the potential to reduce its surrounding temperature.