【摘要】 为探究附着物去除对低温环境下菹草Potamogeton crispus的胁迫作用及其变化,选择全球分布最广且冬季生长的菹草为研究对象,于2016年1月14—19日通过原位测量的方法,对比某静水池塘沉水植物茎叶表面附着物去除前后菹草叶片叶绿素荧光参数的变化情况。结果表明,与未去除附着物的对照组菹草叶片相比,去除附着物的处理组菹草叶片的最大光量子产量(Fv/Fm)仅在第一天随光合辐射强度的增加呈下降趋势,但相对电子传递速率(rETR)值仅在第一天随光合辐射强度的增加呈下降趋势,从试验第2天开始就逐渐恢复到与对照组相近水平(P>0.05)。研究表明,菹草本身对于附着物去除的适应能力可能非常迅速,而在低温环境下,附着物的遮光作用对低温条件下菹草易发的光抑制现象是一种保护。更多还原

【Abstract】 Changes in chlorophyll fluorescence parameters were in situ measured on surface of leaf and stem in crisp pondweed Potamogeton crispus, as wide distribution and growing in winter submerged macrophyte, exposed to epiphyton and removal of the epiphyton on January 14-19, 2016 to evaluate the impact of epiphyton on photosynthesis of crisp pondweed under low temperature environment. It was found that the maximum photon quantum yield(Fv/Fm) was significantly decreased on the treated leaves after the removal of attachments compared with the untreated leaves(P<0.05). However, the relative electron transfer rate(rETR) was decreased only on the first day with the increase in photosynthetic radiation, and decrease in the value of rETR was observed only on the first day, and gradually recovered from the second day of the experiment to same level in the control group(P>0.05). The findings indicate that crisp pondweed has very rapid adaptability of epiphyton removal, especially the shading effect of periphyton being a kind of protection to the photoinhibition of crisp pondweed in low temperature environment.更多还原