摘要
根据1997年～1999年在北部湾进行的渔业资源和生态环境调查数据,利用EwE软件构建北部湾生态系统的营养通道模型,模型由16个功能组构成,包括了哺乳动物和海鸟,每一组都代表在生态系统中具有相似地位的有机体,基本覆盖了北部湾生态系统能量流动的主要过程.模型分析表明,北部湾生态系统的能量流动主要以捕食食物链途径为主,其中无脊椎动物在能量从低级向高层次转换中起关键作用.各功能组的营养级范围为1.00～4.04,哺乳动物占据了最高营养层.生态网络分析表明,系统的能量流动主要有6级,来自初级生产者的能流效率为12.2%,来自碎屑的转换效率为12.3%,平均能量转换效率为12.2%.模型估算的可利用的生物量密度为8.7 t·km^-2,生态系统的生物生产量只占系统净初级生产力的1.81%.当前北部湾海洋生态系统处于不稳定状态.
Based on the investigation of fishery resources and eco-envircnment in the Beibu Gulf of northern South China Sea from October 1997 to May 1999, and with EwE software, a mass-balance ecopath model of Beibu Gulf ecosystem was constructed, which consisted of 16 functional groups （boxes） including marine mammals and seabirds, each representing the organisms with similar roles in the food web, and covered the main trcphie flow in Beibu Gulf ecosystem. The food web in Beibu Gulf ecosystem was dominated by detrital path, and benthic invertebrate played a significant role in transferring energy from detritus to higher trophie levels. Phytoplankton was the primary producer, and the fractional trcphie levels ranged from 1.00 to 4. 04, with marine mammals occupying the highest trophic level. By using network analysis, the system network was mapped into a linear food chain, and six discrete trophie levels were found, with a mean transfer efficiency of 12. 3% from detritus, and 12. 2% from primary producer within the ecosystem. The biomass density of commercially utilized species estimated by the model was 8. 7 t·km^-2, and the bioproduction only accounted for 1.81% of the net primary production, which indicated that the system was still in developing status and instable.
出处
《应用生态学报》
CAS
CSCD
北大核心
2006年第6期1107-1111,共5页
Chinese Journal of Applied Ecology
基金
国家海洋局国家专属经济区和大陆架勘测专项(HY126-02-02-03)
广东省重大科技兴海专项(20050125)
农业部海洋渔业资源可持续利用重点开放实验室开放基金资助项目(2005实开-04).
