Abstract: Firstly,the assessment index system for the economical loss brought by the blizzards and frozen to the forest ecosystem in the functional value of ecological environment services were established and the estimating methods for the various index were ascertained,according to the principles and methods of environmental economics.And then put to calculate the value of assessment indicators through the methods of quantitative and semi-quantitative converting,in order to reflect the loss of ecological functions value in the monetary form and achieve the goal of quantitative evaluation.At the same time,evaluated empirically the value loss,taking the disaster-stricken forest in Fujian province as an example,the results show that the indirect economic loss brought by 2008' blizzard and frozen disasters to Fujian provincial forest in water conservation,soil conservation,carbon sequestration release oxygen,purify air,biodiversity conservation,and other ecological functions value were 10.790 6,8.022 8,5.261 7,2.778 2 and 0.072 0 million yuan yearly,a total of the indirect economic loss in the value of ecosystem services reached 26.925 3 billion yuan yearly,and the direct economic loss brought by 2008 blizzard and frozen disasters to Fujian provincial forestry in provision of forest products is 4.597 5 billion yuan.The results indicated that the indirect use value loss of forest in ecological environment services is far greater than the value loss of the direct provision of forest products.

Key words: blizzard and frozen disasters, forest ecosystem, ecological service, value lose, economic analysis