青藏高原东缘高寒草甸优势植物光合作用日变化的比较研究
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摘要
本文通过对青藏高原东缘高寒草甸优势植物窄叶鲜卑花、高山绣线菊、木里苔草和四川嵩草的光合作用的日变化进行了比较研究。结果表明:窄叶鲜卑花、高山绣线菊和木里苔草的光合速率日动态,都表现出典型的双峰曲线,并且都出现光抑制现象,窄叶鲜卑花的第一、第二峰值分别为22.0和19.3μmol.m-2.s-1;但高山绣线菊峰值相对较低,分别是17.8和13.5μmol.m-2.s-1;而木里苔草峰值相对更低,分别为10.9和10.3μmol.m-2.s-1。但是四川嵩草的光合速率日动态表现出典型的单峰曲线,在11:00左右达到峰值,其峰值为13.6μmol.m-2.s-1。窄叶鲜卑花和四川嵩草蒸腾速率的日动态表现为单峰曲线,而高山绣线菊和木里苔草蒸腾速率的日动态表现为双峰曲线。窄叶鲜卑花、高山绣线菊、木里苔草和四川嵩草的Fv/Fm和ΦⅡPSⅡ的日变化趋势相似,黎明时Fv/Fm和ΦⅡPS最高,之后随着日间光强的升高而逐渐降低,都是在13:00左右时降至最低,表明发生了光抑制现象。
The article comparatively studies on diurnal course of photosynthetic of dominant plants Sibiraea angustata, Spiraea alpine, Carex muliiensis, Kobresia setchwanensis of Alpine Meadow at Eastern Qinghai-Tibetan Plateau. The result shows that diurnal course of Photosynthetic rate of Sibiraea angustata, Spiraea alpine, Carex muliiensis both appears typical double-peak curves, and presents photoinhibition, the first and second peak value of Sibiraea angustata is 22.0 and 19.3μmol.m-2.s-1respectively, but that of Spiraea alpine is relatively low, which is 17.8 and 13.5μmol.m-2.s-1, Carex muliiensis is lower, which is 10.9 and 10.3μmol.m-2.s-1. Diurnal course of transpiration rate of Sibiraea angustata and Kobresia setchwanensis appear typical single-peak curves, but Spiraea alpine and Carex muliiensis appear typical double-peak curves. Diurnal course of Fv/Fm andΦⅡPSⅡof Sibiraea angustata, Spiraea alpine, Carex muliiensis and Kobresia setchwanensis are similar, Fv/Fm andΦⅡPSⅡare highest in dawn, and then decrease with increaseing photosynthetic active radiation, reach the lowest about 13: 00, which presents photoinhibition.
The article comparatively studies on diurnal course of photosynthetic of dominant plants Sibiraea angustata, Spiraea alpine, Carex muliiensis, Kobresia setchwanensis of Alpine Meadow at Eastern Qinghai-Tibetan Plateau. The result shows that diurnal course of Photosynthetic rate of Sibiraea angustata, Spiraea alpine, Carex muliiensis both appears typical double-peak curves, and presents photoinhibition, the first and second peak value of Sibiraea angustata is 22.0 and 19.3μmol.m-2.s-1respectively, but that of Spiraea alpine is relatively low, which is 17.8 and 13.5μmol.m-2.s-1, Carex muliiensis is lower, which is 10.9 and 10.3μmol.m-2.s-1. Diurnal course of transpiration rate of Sibiraea angustata and Kobresia setchwanensis appear typical single-peak curves, but Spiraea alpine and Carex muliiensis appear typical double-peak curves. Diurnal course of Fv/Fm andΦⅡPSⅡof Sibiraea angustata, Spiraea alpine, Carex muliiensis and Kobresia setchwanensis are similar, Fv/Fm andΦⅡPSⅡare highest in dawn, and then decrease with increaseing photosynthetic active radiation, reach the lowest about 13: 00, which presents photoinhibition.
引文
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