Ecological security assessment for the Huangshui Basin of Gansu based on the PSFR model
To mitigate ecological pressure on the watershed,avoid ecological risks,and establish effective ecological management measures,we employed the Pressure-State-Function-Response(PSFR)assessment model to develop a multi-level evaluation system for the ecological security of the Huangshui Basin in Gansu Province.The comprehensive assessment yielded the following specific conclusions:The PSFR model provides a holistic evaluation of the ecological security of the Huangshui Basin,assessing the indices for pressure(P),state(S),function(F),and response(R)as follows:ESI scores were 50.4,50.7,43.5,and 60.2,respectively.These findings suggest that both the ecological environment and socio-economic development pose a certain degree of threat to the basin's ecological security.Specifically,water quality in the river section is deemed satisfactory,with the drinking water service function(F1)also rated positively;However,the watershed's ecosystem service function is primarily characterized by supply functions.Concerns have arisen regarding the deterioration of vertical connectivity in the river,a decline in benthic fauna diversity,and the water source's limited capacity to assimilate additional nutrients(F2).Furthermore,it is important to note that cultivated land reclamation has led to an increase in the soil erosion index(P2-3),while the discharge of carbon and nitrogen pollutants in the watershed presents potential pressures on the environment.There exists a correlation among the assessment factors across the four indices of P,S,F,and R.Identifying the key factors contributing to ecological security pressures and elucidating the interactions among these factors are essential strategies for enhancing the ecological security of the watershed.
NETL
NSTL
万方数据
