莫莫格湿地不同盐分梯度对芦苇生理生态的影响

Eco-physiological Responses of Phragmites australis to Different Salinity Conditions in Momoge Wetland

为探讨莫莫格湿地盐碱条件对芦苇生理生态特征的影响,于2010年在芦苇生长旺盛期,对不同盐分样地芦苇主要生理生态特征进行调查测量,包括株高、株数、生物量、盖度、芦苇叶片叶绿素含量和叶绿素荧光特征。结果表明,中等盐度(Na+含量在80.388mg/L)样地芦苇的株高和生物量等指标均高于低盐度(31.894mg/L Na+)或者较高盐度(258.490mg/L Na+)样地芦苇。而Na+含量在258mg/L时,样地芦苇的株高和生物量等明显低于中低盐度样地,说明较高盐度显著抑制芦苇的生长。Na+含量在258mg/L时,样地芦苇叶绿素含量和最大光化学效率(Fv/Fm)最高,表明此含盐量对芦苇叶绿素含量和光化学效率可能具有小幅促进作用,以减少盐碱胁迫对芦苇的伤害,这可能是芦苇长期适应盐碱胁迫的响应机制。

To discuss the influence of saline-alkaline condition in Momoge wetland on the eco-physiological responses of reed（Phragmites australis）,its eco-physiological characteristics were measured in June,July and August 2010,including plant height,the number of plant,biomass,coverage,the chlorophyll content and chlorophyll fluorescence.The results showed that the plant height and biomass of reed under middle salinity condition（80.388 mg/L Na＋） were higher than those under low（31.894 mg/L Na＋） and higher（258.490 mg/L Na＋） salinity condition.The plant height and biomass of reed under the condition with 258.490 mg/L Na＋ were significantly lower than that under the low（31.894 mg/L Na＋） and middle（80.388 mg/L Na＋） salinity condition,suggesting that the higher salinity inhibited the growth of reed.However,the chlorophyll content and the value of Fv/Fm of reed increased under higher salinity condition,which might be the response mechanism of reed to reduce the damage of saline-alkaline stress.