四川地处长江上游，幅员面积占长江上游流域面积的近５０％，长江上游主要支流嘉陵江、沱江、岷江、雅砻江均发源于四川。因此，四川林业的兴衰、生态环境的优劣，不仅关系到四川社会经济的发展，而且直接影响到三峡工程建设的安危和长江中下游地区工农业生产及人民群众生... Sichuan is located in the upper reaches of the Yangtze River, covering an area of ​​nearly 50% of the upper reaches of the Yangtze River basin. The main tributaries of the upper reaches of the Yangtze River are Jialing River, Tuojiang River, Minjiang River and Yalong River. Therefore, the rise and fall of the forestry in Sichuan and the pros and cons of ecological environment not only relate to the social and economic development in Sichuan, but also directly affect the safety of the Three Gorges Project and the industrial and agricultural production and people’s livelihood in the middle and lower reaches of the Yangtze River.