The Phenological Research on Reproductive Growth of Taiwania cryptomerioides Hay.
| Autor: | Hsin-wu, Hsu, 徐新武 |
|---|---|
| Rok vydání: | 1999 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 87 The Phenological Research on Reproductive Growth of Taiwania cryptomerioides Hay. Abstract The objective of this study was to investigate the phenology on reproductive growth of a tree in a clonal orchard of Taiwania cryptomerioides Hay. which was set in 1966. The phenological model was tried to monitor the microweather changes with setting sensors of light quantum, relative humidity, and thermocouple on various positions around the crown and observe morphological and anatomic changes of reproductive buds of corresponding positions from September 1st, 1998 to May 1st, 1999. The results show that the changes of temperature around the crown was different from the time, weathers and seasons. The estimation of temperature by spatial statistics software (GS+) was influence by the weather conditions. The estimation at night was better than in day, cloudy day was better than rainy day, and low light intensity was better than high light intensity. All the length, diameter, dry weight, amount and the timing of scale open of male and female strobili located at different aspects of crown were different significantly, and may be related to the accumulation of radiation and temperature. The length/diameter ratio of male strobilus in different developmental stages was 1.2, and that of female strobilus was 2 which could be an ideal index for identifying these two. The large ratio of male strobilus dropped in early March, 1999, maybe relate to the high air humidity. The female strobilus differentiated in the end of August, lay dormancy in the initial of November, recovered growth in early April, and opened scales to accept pollens then closed. The male strobilus differentiated before the middle of August, and elongated the axis fast in the end of March, but no pollen was produced. Dormancy of male strobilus didn’t appear with 2-week internal observation. The growth equation of male strobilus was Y=0.0000011296X+0.009324, where Y was the dry weight, and X was the heat sum from October 31, 1998 to date of scale open. The predicated threshold temperature of chilling of female strobilus was below 14℃. After satisfying chilling requirement in early February, heat (degree-hr) was accumulated to open scales until early April. |
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