Taking the 250 hm2 natural spruce forest ecosystem in the middle Tianshan mountains as study object,with the method of combining watershed test and water balance,the water quantity were analyzed synthetically to determine the effects of different ecosystem components.The results showed that:(1)The 80.39% of the rainfall distribution was completed in the soil layer during the water transformation process;The canopy interception rate was 17.92% of the rainfall.And the influence of forest interception on water...