Experiment on Introduced Cool-Season Forage Species in the Hilly Areas of Sichuan Province(A Brief Research Report) Impact of the Snow Disaster Occurred in 2008 in South China to the Clump Bamboo in South Sichuan Pr imary Study on theWood Ana tom ica l and Physica l-Mechan ica lProperties of Introduced D a lbe rgia s issoo Study on Ana tom ica l Structure Var ia tion and Chem ica l Propertiesof Introduced D a lbe rgia sissoo Roxb.