岩溶峰丛山区苦丁茶的生理特性分析

Physiological Characters of Kuding Tea in Karst Mountain Area

用美国产Li-6400便携式光舍测定系统对峰丛山区不同地貌部位的苦丁茶的净光舍速率、蒸腾速率、气孔导度等生理指标进行测定，结果表明生长于洼地和山腰不同地貌部位的苦丁茶具有不同的生理生态特性：山腰的苦丁茶的净光舍速率和水分利用效率大于生长于洼地的，而蒸腾速率和气孔导度小于生长于洼地的．在一定的光强范围内，山腰的苦丁茶的净光舍速率和蒸腾速率随有效光辐射强度及叶片气孔导度的增强而加快；在一定的温度范围内，蒸腾速率随叶温的升高而升高，但当叶温达到一定值（36．8℃）时，蒸腾速率则开始下降．

This paper analyzed the physiological characters of photosynthesis rate, transpiration rate, water use efficiency and stoma conductivity of Kuding tea in different places of Karst mountain area, using Li-6400 system made in USA. The results showed that the photosysthesis rate and water use efficiency of Kuding tea growing on hillside are higher than that of the tea in depression, but transpiration rate and stoma conductivity are lower. The photosythesis rate and transpiration rate rise respectively with the rise of light intensity and stoma conductivity of the leaf, and the transpiration rate also rises with the rise of leaf, temperature, but when leaf tenperature reaches 36.8℃, it begins to descend