高原植物的光合作用与生产力

PHOTOSYNTHESIS AND PRODUCTION OF HIGHLAND PLANT

高原植物,随着海拔的升高,净光合速率、光饱和点、光补偿点及叶绿素含量都有增高的趋势;光饱和下表现量子效率有降低的趋势;没有明显的光合午睡现象。高原植物生育期长,截获的太阳辐射能量多,产量高;形成了特有的高原光合生态型及高原生育生态型。在高原地区,只要选用具有优良生态特性的高产品种,采用合理栽培管理措施,完全能够获得比平原地区作物高得多的产量。

The main climatic characteristic of highland area is that the sunshin is longer in summer, the insident solar radiation is more, the temperature is lower and the temperature difference between day and night is higher. Highland plant has spesific highland ecolgical type and highland development type. Their photosynthetic rate is higher, and their light saturation point is higher, too. They haven' t clear photosynthetic noontime sleep, they contains more chlorophyll and their growing period is longer. This may actually means that highland plant can intercept more solar radiation and produce more dry matter and yield. It means that highland crops with better ecological characters and with appled suitable cultivation in the field may produce higher yield than the crops at low land site.