基于Ecopath模型的洈水水库生态系统特征及鲢、鳙生态容量分析

为分析洈水水库生态系统结构和能流特征,探讨鲢、鳙生态容量,根据2020-2021年的渔业资源调查数据,构建了诡水水库Ecopath模型.洈水水库Ecopath模型由15个功能组组成,有效营养级范围为1.000～3.336,关键种为鳜、鲌类,生态位重叠图表明(鱼)条与主要经济物种鲢、鳙生态位重叠度较高.诡水水库循环指数(...

Analysis of ecological system characteristics and ecological capacity of Hypophthalmichthys molitrix and Aristichthys nobilis in the Weishui Reservoir based on Ecopath model

To explore the current status of the Weishui Reservoir ecosystem and the ecological capacity of Hypophthalmichthys molitrix and Aristichthys nobilis, we used data from the fishery resource survey in July 2020 (summer), September 2020 (autumn), and January 2021 (winter) to establish an Ecopath model. The Ecopath model of the Weishui Reservoir consisted of 15 functional groups, and the fractional trophic levels ranged from 1 to 3.336. The keystones were Siniperca chuatsi and Culters, and the results indicated that their two niches, which included Hypophthalmichthys molitrix, Aristichthys nobilis, and Hemiculter leucisculus highly overlapped. The Finn cycling index (FCI), system connectance index (CI), and omnivory index (SOI) of the Weishui Reservoir were 11.35, 0.351, and 0.099, respectively, indicating that the Weishui Reservoir had a higher material recycling ratio than other lake and reservoir ecosystems, and that its functional groups had more closely and complexly connected relationships. The total system throughput (TST) of the ecosystem of the Weishui Reservoir was 44254.860 t/(km²·a), and the ratio of the total primary production to the total respiration (TPP/TR) was 1.394, indicating that the overall scale of the system was appropriate and was approaching a mature development stage. The biomasses of Hypophthalmichthys molitrix and Aristichthys nobilis in the Weishui Reservoir were 2.117 t/(km² ·a) and 16.577 t/(km² ·a), respectively, and their ecological capacities were 30.169 t/(km² ·a) and 236.217 t/(km² ·a), respectively.