Comparative study on the adaptability of Alnus trabeculosa and Phragmites australis in tidal wetland
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摘要: 以林泽工程物种江南桤木和崇西潮滩优势种芦苇为研究对象,进行半日潮的潮汐淹水模拟实验,对比研究不同潮汐淹水时间下两种植物的光合特征、生理指标变化.研究结果表明:随着持续淹水天数的增加,江南桤木和芦苇气孔导度(Gs)、净光合速率(Pn)、蒸腾速率(Tr)变化趋势一致,均呈下降趋势;江南桤木和芦苇的水分利用效率(WUE)随持续淹水天数的增加呈现出先升高后降低的趋势,说明一定程度的淹水促进了两者的水分利用效率,两种植物表现出一定的耐水淹能力.随着日淹水时间的增加,江南桤木的POD活性降低,MDA含量增加,芦苇POD活性先下降后增加,MDA含量无积累;不同日淹水处理下两种植物的叶绿素含量均无明显变化.由此可见,在潮滩湿地周期性淹水条件下,江南桤木具有和芦苇类似的耐水淹能力,是一种适用于林泽湿地工程构建的优良植物物种.Abstract: Self-designed experimental mesocosm for semidiurnal tidal simulation was used to compare the effect of different submergence time on photosynthesis process and physiological characteristics of Alnus trabeculosa and native species (Phragmites australis). The results showed that A. trabeculosa and P. australis have similar decreasing tendency in Stomatal conductance (Gs), Net photosynthetic rate (Pn) and Transpiration rate (Tr) with increasing submergence time; however, the water use efficiency (WUE) of these two species showed the tendency of first increased and then decreased, suggesting that the increasing submergence time promoted the WUE of A. trabeculosa and P. australis in some degree. With daily submergence time increasing, POD activity and MDA content of A. trabeculosa decreased and increased, respectively; POD activity of P. australis first increased and then decreased; however, MDA content of P. australis hasnt significant difference. A. trabeculosa showed the similar tolerance to the periodic inundation of tidal wetland, which suggests that A. trabeculosa can be also used to construct ecological engineering in Chongxi wetland.
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