A Study of Dynamic Characteristics of Forest Resources in Yucheng District of Ya'an City

By using the data of forest resource planning and design inventory in 1995 and 2015,analysis was made of the dynamic change of forest resources in Yucheng District in recent 20 years.The results showed that the area of forest land increased from 546 000 hm² in 1995 to 769 000 hm² in 2015,increasing by 223 000 hm².Forest coverage rate increased from 43.50% to 62.46%,increasing by 19.46%.Living tree volume increased from 21.87 million m³ in 1995 to 525.06 million m³ in 2015,increasing 306.3 million m³.Forest productivity increased from 36.97 m³·hm^-2 to 67.99 m³·hm^-2,increasing by 31.02 m³·hm^-2.Natural Forest Protection Project and Defarming-and-reafforestation Project increased the area,volume and cover rate of the forest.