关键词: 造林贡献率, 人工林, 森林调查

Abstract: It will be practically significant to evaluate afforestation benefits by means of quantitative analysis. The paper analyzes the data in detail based on 8 forest resource inventories and the forest area planted over the past 60 years in the country. In the period from 1950 to 2008,the accumulative planting area reached 261.3792 million ha.The forest coverage has been increased by 10.44% by artifical afforestation but the rate of prevesed area is 61.55% of artifical adult forest area,and the percentage of forest harvesting and occupantion is 38.45%.The average contribution rate of planting area has reached 38.44% in the past 60 years in China. For recent 15 years,the average contribution rate is 50.20% and afforestation benefits have increased gradually. Although there exist poor site conditions for afforestation, input shortage and large amount of forest harvesting and consumption, the artifical afforestation has made great achievements in China.Artifical forest products have played an important role in wood production,forest-chemical industry, raw materials for medicine, food products,ecological products, ect. In the period from 1950 to 2008, the total forest cutting volume reached 15.452 billion m³.The amount of wood products is 9.271 billion m³.,of which the artifical forest cutting volumn is 1.541 billion m³, 10% of total forest cut volume during the past 60 years and up to 39.44% over the recent years.

Key words: contribution rate of afforestation, artificial forest, forest resource inventory