The study provided ecology security pre-warning and security construction with scientific basis in the Loess Hilly region.【Method】 Based on analysis of ecological security state and impact factors of Zhifanggou valley during 70 years and Press-State-Response(PSR) model,pre-warning index system of agricultural ecology security was established.AHP and Delphi methools were used to determine indicator weight;integrated value of ecology security was calculated by integrated index method;development a...
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