一、成过熟林资源的消长: 我局的天然用材成过熟林在一九七三年森林资源复查后面积为289758公顷,蓄积量为5269万立方米,占活立木总蓄积量的80％平均每公顷蓄积量为183立方米。一九八二年末资源统计时面积为191941公顷,蓄积量为3148万立方米,占活立木总蓄积的67.4％,平均每公顷蓄积量为164立方米,同一九七三年 First, the growth and decline of over-mature forest resources: Bureau of natural timber into over-mature forest forest resources in 1973 after an area of ​​289758 hectares, the volume of 52.69 million cubic meters, accounting for the total stock volume of standing trees 80 The average volume per hectare is 183 cubic meters. At the end of 1982, the resource statistics area was 191,941 hectares with an accumulated volume of 31.48 million cubic meters, accounting for 67.4% of the total volume of live stumpage. The average stock volume per hectare was 164 cubic meters, the same in 1973