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(Phragm ites 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.
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.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第5期1097-1101,共5页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目(2002CB412406)
国家自然科学基金青年科学基金项目(40306015)
上海市科技攻关资助项目(04DZ12049).
关键词
潮滩湿地
演替
生态特征
含氮量
生物量
tidal beach wetland
succession
ecological character
nitrogen content
biomass.
