中文摘要：

在直径35．5cm、深100cm的试验桶内装填厚度80cm的江沙，选择形态和节数一致的菖蒲根状茎栽种到桶内江沙中．调节并控制试验桶水位埋深，模拟研究湿地水位埋深变化对菖蒲萌发和幼苗生长的影响，为湿地生态系统保育和受损区域植被恢复提供理论依据．试验结果表明：（1）水位埋深对菖蒲萌发和幼苗生长有不同程度的影响，水位埋深为-60cm至-20cm条件下菖蒲皆能萌发，且随着水位埋深减小，萌发率降低．试验70d，-20cm试验组菖蒲萌发率达到90％，分别为-50cm和-60cm试验组的2．25和3倍．而0cm水位埋深条件下，菖蒲不萌发；（2）菖蒲幼苗叶长、叶宽和叶面积随水位埋深减小而减小，各试验组间差异极显著（P〈001），叶片数量也随水位埋深减小而减小，-20cm和-40cm试验组极显著高于-50cm和-60cm试验组（P〈0．01），且-60cm水位埋深严重影响菖蒲幼苗的存活，试验70d后菖蒲幼苗相继死亡；（3）随水位埋深减小，菖蒲幼苗叶片Chl．a和Chl．b含量下降，Chl．a／b升高，类胡萝卜素（Car）含量升高，植物通过形态调节和减少色素含量来减少叶片对光能的捕获；（4）水位埋深过小导致的低土壤水分含量还使菖蒲幼苗叶片细胞膜脂过氧化加剧，细胞质膜透性迅速增大；（5）水位埋深影响菖蒲幼苗叶片快速光响应曲线，水位埋深越小，ETRmax和最小饱和光照强度越低，光响应能力越弱．

英文摘要：

Effects of groundwater depth on germination and seedling growth of Acorus calamus were studied by simulating experiment. The experimental barrels （diameter of 35.5cm and depth of 100cm） were filled with fluvial sands of 80cm depth. The water was introduced directly into the bottom of the barrels to build the groundwater depths in -60cm, -50cm, -40cm, -20cm and 0cm in different five barrels respectively. The same rhizomes of A. calamus were selected and planted in each barrel. The results were as follows： （1） Groundwater depth has significant effects on germination and seedling growth of A. calamus. The plant can germinate in the groundwater depth from -60cm to -20cm, when groundwater depth decreased germination ratio reduced. On the 70th day, germination ratio of the -20cm treatment reached 90%, which were 2.25 and 3 times of those in the -50cm and -60cm treatments. Plant of 0cm treatment can not germinate. （2） Leaf length, width and area were positively correlated with groundwater depths and the significant correlations are able to be accepted （P 〈 0.01）. With decreasing of groundwater depth, the number of the laminae reduces. The number of the laminae in -20cm and -40cm treatments were very significantly higher than those in -50cm and -60cm treatments （P 〈 0.01）. Groundwater depth of-60cm was greatly affected on survival of plant seedling since plant seedling of-60cm treatment began to die after the 70th day. （3） With decreasing of groundwater depth, Chl.a, Chl.b and Car reduced but Chl.a/b increased. Plant leaves captured the light reducibly by the way of morphological adjustment and chlorophyll content reduction. （4） The laminae MDA and membrane permeability increased, which is led by low soil water content caused by low groundwater depth. （5） Groundwater depth has great effects on the rapid responded light-curves of A. calamus. As groundwater depth decreases, the maximal photosynthetic electron transport rate （ETRmax） and the minimal saturated light intensity reduce,