中文摘要：

选择形态和节数一致的芦苇根状茎栽种到装有江沙的试验桶内,调节并控制试验桶水位,模拟研究江滩湿地地下水位变化对芦苇叶片生理特征的影响。结果表明,在0—-40cm地下水位条件下,芦苇叶片生长情况良好,但随着地下水位降低,芦苇叶长、叶宽和叶面积减小,叶绿素含量降低,最大表观光合电子传递速率和最小饱和光照强度降低。试验时间延长,各试验组叶片进一步生长,但试验组间差异减小,地下水位制约作用减弱。各试验组叶片叶绿素含量和快速光响应曲线均呈现先上升再下降的趋势,与芦苇生长发育的季节性变化规律相一致。地下水位-60cm试验组芦苇植株在试验初期存活,进入快速生长期后叶片发黄枯萎,光响应能力减弱,细胞膜脂过氧化加剧,导致芦苇植株相继死亡,说明-60cm地下水位对芦苇生长形成抑制。

英文摘要：

Influence of groundwater table on physiological properties of Phragmites australis leaves was studied in a simulating experiment.In the experiment barrels（diameter of 35.5 cm and depth of 100 cm） were filled with river sands up to 80 cm.Water was introduced directly into the bottom of the barrels to simulate groundwater tables.Water tables were kept at-60,-40,-20 and 0 cm in different barrels,separately.Rhizomes of Phragmites australis,the same in shape and number of blocks,were selected and planted in each barrel.Results show that groundwater table affected significantly leaf shape,chlorophyll content,membrane permeability and rapid light-curves of Phragmites australis leaves.When the groundwater table ranged in 0——40 cm,Phragmites australis grew well.Leaf height,leaf width,leaf area,chlorophyll content,maximal photosynthetic electron transport rate and minimal saturated light intensity of the three treatments were positively related to groundwater table,but membrane permeability was not so;As time went by,leaves of the plants in each treatment further grew,but the difference between treatments narrowed and the effect of groundwater table weakened.Chlorophyll content and rapid light response curves rose first and then declined,which is in conformity with the seasonal variation of the growth of the plant.In Treatment-60 cm,the plants survived at the beginning of the experiment and then their leaves turned yellow and withered at the late fast-growth stage,and ultimately indicating that groundwater table at-60 cm suppressed growth of Phragmites australis.