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光作为光合作用的能量来源,对植物的光合生产有很大的影响。本文以十种草原植物为研究对象,于1985—1986年在典型草原地带进行了草原植物的光—光合特性的研究。根据叶片净光合速率和光呼吸速率的高低,可确定这十种草原植物都属C_3草本植物范围。由测定结果表明,它们对光能的利用效率有所不同。当植物叶片在晴天最大光强(110千勒)时,山葱和马蔺的总光合和净光和均无光饱和点;均有光饱和点的是冰草、西伯利亚羽茅、大针茅、贝加尔针茅、无芒雀麦和日阴营;总光合无光饱和点,净光合有光饱和点的是羊草和芨芨草。并可认为近光饱和点是植物的适宜光强。
Light as a source of energy for photosynthesis, the photosynthetic production of plants have a great impact. In this paper, ten species of grassland plants were studied, and the photosynthetic characteristics of grassland plants were studied in the typical steppe from 1985 to 1986. According to the leaf net photosynthetic rate and the level of photorespiration, it can be determined that these ten grassland plants belong to the range of C_3 herbaceous plants. From the measurement results show that they use different efficiency of light energy. When the plant leaves in the sunny maximum light intensity (110 kelvin), the total photosynthetic and net light and Iris and Iris no light saturation point; both light saturation point is Agropyron, Siberian feather, , Stipa baicalensis, Bromus inermis and Campanulaceae; the total photosynthetic matting point, the net photosynthetic light saturation point is Leymus chinensis and Achnatherum splendens. And can be considered as the light saturation point is the appropriate plant light intensity.