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崇明东滩湿地高等植被演替特征

闫芊1,2;陆健健1;何文珊1   

  1. 1华东师范大学河口海岸学国家重点实验室, 上海 200062;2长江流域水资源保护局上海局, 上海 200120
  • 收稿日期:2006-03-29 修回日期:1900-01-01 出版日期:2007-05-15 发布日期:2007-05-15

Succession character of salt marsh vegetations in Chongming Dongtan etland.

YAN Qian1,2; LU Jian-jian1; HE Wen-shan1   

  1. 1State Key Laboratoty of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;2Shanghai Branch of Yangtze River Water Resource Protection Bureau, Shanghai 200120, China
  • Received:2006-03-29 Revised:1900-01-01 Online:2007-05-15 Published:2007-05-15

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.

关键词: 城市森林, 结构, 绿量, 人为干扰

Abstract: 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 alterniflora 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. mariqueter, and 39.3 t for S. alterniflora.

Key words: Urban forests, Structure, Vegetation quantity, Human disturbance