Study on Hydraulic Physiology of Five Afforestation Species in Drought - Wet Season in Central Taiwan
| Autor: | Yu Cheng Tsai, 蔡育宸 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 How plnats responding to drought stress has long been discussed by ecophysiologist. The weather pattern in western Taiwan is rainy in summer and dry in winter, which is also an inhibition of plants growth in winter. To identify the physiological state between dry and wet season of Sapindus mukorossii, Fraxinus formosana, Cyclobalanopsis glauca, Bischofia javanica and Melaleuca leucadendra in plain of Yunlin area, we measured the response of trees physiology in different season. The result show that the net photosynthesis rate, stomatal conductance, transpiration rate, leaf water potential obtained in dry season almost reduced with the improvement of water use efficiency and also found there was the defoliation period on Sapindus mukorossii and Bischofia javanica in January and March. Because of the higher precipitation comparing to January and March 2013, except for Sapindus mukorossii which was under defoliation period, the other tree species showed higher photosynthesis and transpiration rate in January 2014. Cyclobalanopsis glauca and Melaleuca leucadendra showed high net photosynthesis rate in January 2013 express a better capacity of environment adaptation to drought. It was found that the photosynthesis rate improvement of Fraxinus formosana after pruning, which suggested a well responses to compensate for the impacts of defoliation. The trees species with high leaf area index also showed high transpiration. In chlorophyll fluorescence we observed, Fv / Fm were not totally lower in dry seanson and higher in rainy season. The degradation of gas exchange in dry season would cause by stomatal limitation and lower temperature-induced activity decreased of enzyme. To synthesize above result, the degradation of gas exchange in dry season of plain area of Yunlin didn’t induce irreversible injury. The tree species we observed could adapt dry season in western Taiwan by stomatal adjustment, defoliation or by deep root. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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