Ecological Security Evaluation of Reservoir Based on DPSIR Model:Case Study of Dongzhen Reservoir in Fujian in 2015 and 2019
As an essential part of China's engineering system,reservoirs have comprehensive functions such as flood control,water supply,electricity storage,irrigation and ecology.Evaluating and studying the ecological security and main obstacles of reservoirs is of great significance for understanding the present ecological security of reservoirs and promoting the protection and sustainable development of ecological environment of reservoirs.Taking Dongzhen Reservoir in 2015 and 2019 as a research object,an ecological security evaluation index system involving 62 indexes was built under a DPSIR model based on 4 factors(social and economic activities,aquatic ecosystem health,ecosystem services and regulatory management).The ecological security index(ESI)of the reservoir was obtained through weighted summation of the four factors respectively.The results indicated that:(1)In 2019,the social and economic activities,ecological services and regulatory management functions of the study area were all improved,especially the regulatory management made a great contribution to the ecological security of the reservoir.However,the aquatic ecosystem health was not ideal and decreased compared with 2015.(2)ESI were respectively 65.55 and 70.72 in 2015 and 2019,which showed that the ecological system was in a state of relatively safe,but there was still a gap to achieve the safe level.Under the condition that the ecosystem services and regulatory management of watershed had reached a higher level,aquatic ecosystem health was the dominant factor affecting the ecological security of Dongzhen Reservoir.The results can provide data support for the ecological security and environmental protection of the reservoir.
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