| In the frame of plotting study area—risk sources analysis—risk suffer analysis—risk exposure analysis—risk imperil analysis—risk integrated analysis,the ecological risk in Zhanang County Lhoka Prefecture in Tibet was appraised,and risk management was carried out by risk tolerance analysis—risk decision making—implementing the measures of reducing risk.The results showed that:①the integrated ecological risk was presented symmetrically along Brahmaputra,and was mitigated from valley farming area to mountain pastoral area;②the hazards of main risk sources to risk suffer in each subregion was differently,drought was the common risk source and imperils farming and stock raising severely;③aimed at enhancing the ability of fighting drought,controlling flood and stabilizing sand engineering measures should be taken steps to prevent those hazards;mountain hazards must be controlled in resident area and along arterial traffic;manual work should be done to void hail in those area where hails attacked heavily;there is need to promulgated risk knowledge to herdsmen for strengthening their risk consciousness and improve the ability of preventing risk and self-help after hazards happened in the pasturing area. |