Abstract: [Objective] In order to provide the basic data for the rosin industry development in China, the dynamic changes of pine resin resources and its development tendency in recent years were investigated, at the same time, the causes of changes and its existing problems were also analyzed.[Method] Based on the published data of national forest resource continuous inventory in 2002 and 2012, the "diameter class method" was used for calculating and analyzing the China's pine resin resources and rosin storage.[Result] The results showed that the large-scale resin-obtained pine trees were Pinus massoniana, P. yunnanensis, P. kesiya and P. elliottii. The area and wood accumulation of those four forest stands were 985.5×10⁴ hm² and 58 212×10⁴ m³, 447.8×10⁴ hm² and 49 475×10⁴ m³, 55.8×10⁴ hm² and 5 982×10⁴ m³, and 10.5×10⁴ hm² and 515×10⁴ m³, respectively. The total area of pine forest resources available for resin collection in China was 1 499.6×10⁴ hm², which decreased 33.2% compared with that of 2002. The total amount of pine resin storage was 562.1×10⁴ t·a^-1, which increased 118.4% compared with that of 2002. The stand volume and the amount of pine resin storage per unit forest area were 76.1 m³·hm^-2 and 1 090.5 kg·hm^-2a^-1, respectively, which increased 57.56% and 89.1% compared with those of 2002, respectively. The near-mature, mature and over-mature forest area accounted for 35.1% and increased by 13.0%, the stocking volume was 57.0% of the total and increased by 12.8%. The young and middle age forest area accounted for 64.9% and reduced by 13.0%, the stocking volume was 43% of the total and reduced by 12.8%. The total area of forest mainly used for resin collection and fuelwood was 889.7×10⁴ hm², accounting for 59.3% of the total amount and increased by 4.8%, with a decrease of 38.2% compared to that of 2002. The stand volume per unit area was 67.6 m³·hm^-2 with an increase of 52.2% compared to that of 2002. The pine resin storage was 404.7×10⁴ t·a^-1, accounting for 72.0% of the total and dropped by 8.9% with increase of 150.3% compared with that of 2002.[Conclusion] The quality of China's pine forest resources available for resin collection was improved, the total amount of resin resources and resin storage per unit area were both increased, the subsequent mining pine resin resources in young forest decreased largely, the number of P. massoniana declined sharply. The proportion of pine resin resources in the pine tree was increased significantly, the area increased from 22.1% to 35.1%, and the accumulation increased from 44.2% to 57.0%, young and middle age forest decreased significantly. The distribution of scale mining resin pine resources was observed in 17 provinces, municipalities or autonomous regions, and the resources amount and pine resin storage quantity were the most in Yunnan Province. The trend that pine resin resources were transferred from the past mainly in the coastal to landlocked southwestern area exhibited significantly.

Key words: pine resin resources, dynamic change, pine forest available for resin collection, storage amount of pine resin