摘要
根据2010年对江苏滆湖渔业资源和生态环境调查数据,采用Ecopath with Ecosim软件构建了滆湖生态系统的物质平衡ecopath模型,以期为在滆湖进行生态修复提供支持和指导。ecopath分析结果表明:2010年滆湖生态系统包含7个营养级,各功能组的有效营养级范围为1～3.691,其营养物质流动主要发生在前4个营养级,占总流量的99.8%。系统总生产量为1 974.82t/km2.a,总流量为8 562.544t/km2.a,联结指数、系统杂食系数、Finn’s循环指数以及Finn’s平均路径长度分别为0.219、0.189、7.99和2.841;生产量/呼吸量、生产量/生物量分别为2.189和3.509;平均捕捞营养级为2.56。食物链以开始于藻类的牧食食物链和开始于碎屑的碎屑食物链为主,系统总能量转换效率为6.4%。与滆湖1986～1989年的ecopath模型相比较,滆湖生态系统的总流量减小,r-对策者在系统中所占比例增加,K-对策者在系统中所占比例减小,根据Odum对成熟生态系统的描述,滆湖目前正处于退化演变过程中。
With the objective of supporting and guiding conservation of Lake Gehu based on the survey data in 2010,a mass balanced model of the Gehu Lake ecosystem was constructed using Ecopath with Ecosim software. The analysis results indicated that there were seven trophic levels （TLs） in the studied ecosys- tem,with the trophic flows primarily occurred in the first four TLs and effective trophic levels of the com- partments varied from 1 to 3. 691. Total system production was 1 974.82 t/km2 ~ year,and the total system throughput was 8 562. 544 t/km2 ~ year. Connectance index （CI） ,system omnivore index （SO1） ,Finn＇s cycled index （FCI） and Finn＇s mean path length （FML） were 0.219,0.189,7.99 and 2.841,respectively. Primary production/respiration, primary production/biomass were 2. 189 and 3. 509, respectively. Mean trophic level of the catch was 2.56. Dominant food chain included the grazing food chain beginning with detritus and the detritivorous food chain beginning with detritus. Compared current model with the model of 1986--1989, system throughput of Lake Gehu shrinked, with r-strategist increasing and K-strategist decreasing in the system. According to Odum＇ s description of mature ecosystem, the Gehu lake ecosystem now is degrading from mature status.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2013年第2期189-197,共9页
Resources and Environment in the Yangtze Basin
基金
国家水专项基金(2012ZX07101-007):"湖荡湿地重建与生态修复技术及工程示范"
