摘要
芦苇是世界广布植物。在松嫩平原不同旱地生境,芦苇叶片的净光合速率日变化均为双峰曲线,有明显的光合"午休"现象。在草甸、沙地和碱斑生境,芦苇光合"午休"现象是气孔限制因素所致,低洼生境则由叶肉光合能力下降所致。芦苇叶片的净光合速率以碱斑生境最高,以长期受到林荫影响的沙地生境最低。4个旱地生境芦苇的光响应曲线具有相同的规律性变化,均可用二次方程定量刻画。芦苇的光补偿点和光饱和点与生境土壤条件无关,只与光照条件有关。在长期林荫影响下的沙地生境,芦苇的光补偿点和光饱和点均较低。
Phragmites communis Trin. is a worldwide species. The net photosynthetic rates of the leaves all showed two peaks on the curves of diurnal changes, and all had obviously phenomena in midday depression of photosynthesis in different dry land habitats in the Songnen Plains in China. What leading to the phenomena was stomatal limitation factor in the habitats of the meadow, the sand land and the alkali spots, while was nonstomatal factor but the decrease of photosynthetic capacity of the leaves in the habitat of the lowland. The net photosynthetic rates in the leaves of P. communis were the highest in the habitat of alkali spot, and the lowest in the habitat of the sand land where there was the influence of the shade of woods for long time. In four dry land habitats, the light response curves were same regular change, which could be quantitatively described by quadratic equation. The light compensation point and light saturation point had no relation to the habitual soil factors, but only related to the light illumination. The light compensation point and light saturation point of P. communis in the habitat of sand land, where there was the influence of the shade of woods for long time, were lower than the others.
出处
《草业学报》
CSCD
2003年第3期16-21,共6页
Acta Prataculturae Sinica
基金
国家重点基础研究发展规划项目(G1999043407)
国家自然科学基金项目(30070137)。
关键词
芦苇
旱地生境
净光合速率
光合“午休”
气孔限制
光补偿点
光饱和点
Phragmites communis
dry land habitat
net photosynthetic rate
midday depression of photosynthesis
stomatal limitation
light compensation point
light saturation point
