欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
以不同生育期的外来入侵植物黄顶菊及其4种伴生杂草为材料，在实验网室条件下测定比较了它们的基本光合和叶绿素荧光特性，从而探讨黄顶菊具有高生物量及较强入侵性的原因，为其防控提供理论依据。结果表明：（1）5种植物的净光合速率日变化均呈单峰曲线，黄顶菊净光合速率以现蕾期最高，且大于其他4种伴生杂草；（2）3个生长时期的黄顶菊水分利用效率低于棒头草，高于齿果酸模和曼陀罗，而与反枝苋相当，显示较高的抗旱性；（3）影响5种植物光合速率主要因子为非气孔因素，影响黄顶菊以及棒头草、反枝苋等的主要生态因子是光合有效辐射，显示出其较强的喜光特性；（4）5种植物在午间较强的光照条件下均发生了不同程度光抑制，处于现蕾期和开花期的黄顶菊以及其余3种植物午间的Fv／Fm有轻微下降，其PSⅡ实际光化学效率维持在较高的水平。可见，黄顶菊具有较强的光合能力，更适应于在夏季高温干旱的环境下生长，从而表现出较强的入侵性。
英文摘要：
The photosynthetic and chlorophyll fluorescence characteristics of Flaveria bidentis, a new exotic invasive weed species, and its 4 companion species were comparatively studied. The results were as follows： （1）The diurnal variation of net photosynthetic rate （Pn） in leaves of five plants presented a single-peak curve pattern,and Flaveria bidentis plants in budding stage have the highest Pn value,compared to ones in other growing stages and 4 companion species; （2）Comparing to other weedy species,the Flaveria bidentis plants in three growing stages showed superior water utility efficiency （WUE）,showing higher drought adaptability;（3） The diurnal variation of Pn was mainly determined by non-stomatal limitation. Grey correlation analysis showed the main factors in summer affecting the Pn of the species with high photosynthetic efficiency, namely Flaveria bidentis , Pol ypogon f ugax , Amaranthus retro flezus were PAR ; （4） Chlorophyll fluorescence showed that photoinhibition was observed with all species in mid-day,but with different degree. Most of all,Flaveria bidentis plants in budding and flowering stage only got slight photosynthetic depression （Fv/Fm）,and higher PSⅡ photochemistry efficiency was retained at all periods of the day. The result obtained in this article will contribute to our interpretation for higher biomass and invasiveness of Flaveria bidentis, and this information is also expected helpful to the effective control of this exotic weeds.
同期刊论文项目
同项目期刊论文
期刊信息
位置：