中文摘要：

研究了崇明东滩湿地植被演替过程中生态特征以及重要值、地上部分生物量、植被地上部分氮含量以及氮容量的季节性变化.结果表明：随着高程的升高,演替早期的代表物种海三棱藨草（Scirpus mariqueter）的重要值逐渐减小,互花米草（Spartina alterniflora）和芦苇（Phragmites australis）的重要值增大.演替过程中植物的生物多样性逐渐增加.3种植物地上部分生物量在生长季节内（3-10月）均呈单峰变化,一般在夏季（7、8月）生物量最大.3种植物地上部分氮含量在生长季节内均呈降低趋势,氮容量在生长季节内呈单峰变化.估算每年崇明东滩保护区内芦苇地上部分蓄积的氮为383.4 t,互花米草为39.3 t,海三棱藨草为50.5 t.

英文摘要：

This paper studied the ecological character, importance value, aboveground biomass and its N content of salt marsh vegetations in Chongming Dongtan wetland in the process of succession. The results indicated that with the increase of altitude, the importance value of Scirpus mariqueter, a representative species at early succession stage, decreased gradually, while those of Spartina alterrtiflora and Phragmites australis increased. The biodiversity of the vegetations increased with succession. During growth period （ from March to October）, the aboveground biomass of the three species varied in single hump curve, with the peak in July and August. The N content had a decreasing trend, while the N capacity showed a single-peak curve. The estimated annual N accumulation in aboveground biomass was 383.4 t for P. australis, 50. 5 t for S. rnariqueter, and 39. 3 t for S. alterniflora.