草地学报

›› 2000, Vol. 8 ›› Issue (3): 155-163.DOI: 10.11733/j.issn.1007-0435.2000.03.001

• 研究报告 •    下一篇

冰草叶片光合速率与生态因子的关系

杜占池, 杨宗贵   

  1. 1. 中国科学院自然资源综合考察委员会, 北京, 100101;
    2. 中国科学院植物研究所, 北京, 100093
  • 收稿日期:1999-03-16 修回日期:1999-11-11 出版日期:2000-08-15 发布日期:2000-08-15
  • 基金资助:
    中国科学院内蒙古草原生态系统定位研究站、国家自然科学基金重大项目(49790020-04);中国科学院“九五”特别支持项目

Studies on the Relations Between Photosynthetic Rate and Ecological Factors in a Leaf of Agropyron cristatum

Du Zhanchi, Yang Zonggui   

  1. 1. Commission for Integrated Survey of Natural Resources, Academia Sinica, Beijing, 100101;
    2. Institute of Botany, Academia Sinica, Beijing, 100093
  • Received:1999-03-16 Revised:1999-11-11 Online:2000-08-15 Published:2000-08-15

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摘要： 冰草属于C3阳性草本植物中光合效率较高,对温度适应性较广的一类。在适宜条件下,光饱和点和光合速率较高,接近一般C3阳性植物的上限,其光补偿点和CO2补偿点较低,在C3阳性植物的下限。最适温度范围较宽,为19-28℃,高温补偿点高达63℃,远远超出C3阳性草本植物的范围。与C3植物羊草比较,冰草的土壤水分补偿点较低,当土壤由湿变干时,光合生态特性指标的变化率较小,表明其耐干旱能力较强。冰草的温度饱和点较低,高温补偿点较高,最适和适宜温度范围较宽,表明对温度的适应性较广。冰草的最大光合速率较高,CO2补偿点较低,表明对CO2的利用能力较强。此外,两种植物的光饱和点和光补偿点差异不明显,说明二者对光的适应性较为一致。

关键词: 冰草, 光合速率, 生态因子

Abstract: A.cristatum is one of C3 sun herb that photosynthetic rate is higher and adaptability on temperature is stronger.Its light saturation point and photosynthetic rate are higher that are near to upper limit of general C3 sun herb;light compensation point and CO2 compensation point are lower that about close to lower limit of common C3 sun herb;range of optimum temperature is wider,19-28℃;compensation point of high temperature is about 63℃ that far go beyond the bounds of C3 herb in the appropriate condition.2.As compared with constructive species in typical steppe zone,C3 herb Leymus chinensis ,compensation point of soil water of A.cristatum is lower,the change ratio of the characteristic index of photosynthetic ecology is smaller when the sufficient soil moisture became deficit,these prove that its ability of drought resistance is stronger,maximum photosynthetic rate of A.cristatum is higher and CO2 compensation point is lower,these mean that use ability of A.cristatum on CO2 is higher.In addition,differences of light saturation point and of light compensation point of two plants are not obvious,these show that adaptability of two plants on light is roughly the same.

Key words: Agropyron cristatum, Photosynthetic rate, Ecological factor

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