U.S. hardwood lumber, logs and veneer exports are among the products impacted in a new round of tariffs announced last Friday by the Chinese government. The tariffs will be implemented in two phases, beginning Sept.1 and Dec. 15.   New and additional tariffs of 5% and 10% on being levied. According to information provided by the American Hardwood Export Council and the National Hardwood Lumber Association, products impacted include:  Annex 1 (Sept. 1) - An additional 10% will be tacked on to: pine lumber (was at 20%); other coniferous lumber (was at 20%);  softwood chips or ...