柳杉光合作用對季節與方位之反應

PHOTOSYNTHETIC RESPONSES OF CRYPTOMERIA JAPONICA TO SEASONS AND ORIENTATION

楊韻平(Yun-Ping Yang) ； 王介鼎(Chieh-Ting Wang) ； 周宏祈(Hong-Chyi Jhou) ； 王亞男(Ya-Nan Wang) ； 陳忠義(Chung-I Chen) ； 陳勇至(Yung-Chih Chen)

《中華林學季刊》 50卷1期 (2017/03) Pp. 1-17

摘要

本研究於臺大實驗林溪頭營林區，量測柳杉(Cryptomeria japonica)之光合作用速率，探討光合作用速率在不同方位及不同時節之差異。光反應曲線結果顯示，柳杉對於人工光源之光合作用潛力在季節轉換中無明顯變化。但實際比較乾濕季中光合作用速率發現，濕季時柳杉之光合作用速率比乾季高，而濕季的主要影響因子為光度，蒸散速率次之，乾季則亦為光度最重要，相對濕度次之。此外在東向與西向柳杉之光合作用速率日變化具有顯著差異，主要因環境光度、柳杉之蒸散速率及葉溫差異所致。總結顯示柳杉光合作用速率會隨季節及方位而變化。

關鍵字

柳杉 ； 光合作用速率 ； 方位 ； 季節

並列摘要

In this study, the photosynthetic rate (A_n) of Cryptomeria japonica was measured to observe the variation of A_n in different orientations and between different seasons in Xitou, the Experimental Forest, National Taiwan University. The light response curves between the dry and wet seasons showed that the photosynthetic capability of C. japonica does not change drastically with season. However, the A_n of C. japonica in the wet season was higher compared with that of the dry season. Radiation was the most influential factor affecting A_n, followed by the evapotranspiration rate in the wet season, and relative humidity in the dry season. Furthermore, the A_n of C. japonica in the east-orientation was significantly different from that of the west-orientation due to radiation, transpiration rate, and leaf temperature. In conclusion, the A_n of C. japonica can vary with seasonal change and orientation.

並列關鍵字

Cryptomeria japonica ； photosynthetic rate ； orientation ； season