基于Ecopath的黔东南稻—渔共养生态系统结构与功能研究OA

To quantitatively evaluate the impacts of the rice fish co-culture model on ecosystem structure and energy flow characteristics,a field experiment was conducted in 2025 at the Guizhou University of Finance and Economics Science and Technology Courtyard in Shidong Town,Taijiang County,Qiandongnan Prefecture,Guizhou Province.A rice fish co-culture system and a rice monoculture system(control)were established.The Ecopath with Ecosim(EWE)model was applied to construct trophic pathway models for both systems,and comparative analyses were conducted on trophic structure,food web characteristics,and energy transfer efficiency.The results showed that the highest trophic level of the rice fish co-culture system was 3.09,lower than that of the control system(3.90).The food web consist-ed of both grazing and detrital chains,including 19 functional groups.Compared with the control system,additional fish functional groups such as grass carp,common carp,silver carp,and bighead carp were incorporated,leading to in-creased food web complexity.Energy transfer efficiencies between trophic levels(II IV)in the rice fish system were significantly higher than those in the control system(12.28%,7.11%,and 6.91%vs.10.17%,6.38%,and 2.78%,re-spectively).The total system energy transfer efficiency reached 2.8%,exceeding that of the control(1.9%).The connectance index(0.21)and omnivory index(0.27)were higher than those of the control system(0.16).Finn's Cycling Index was also higher(0.27 vs.0.21),while the mean path length was shorter(3.43 vs.4.23).Overall,the rice fish co-culture system demonstrated higher energy utilization efficiency and structural complexity.However,it remains in a developmental stage,and further optimization of fish community structure is required to en-hance system stability.This study provides a theoretical basis for evaluating the ecological benefits and sustainable de-velopment of rice fish co-culture systems.