The Qinghai-Tibetan Plateau,often referred to as the Third Poleof the world,plays an important role in the Earth's climate system. Chinese pine( Pinus tabulaeformis) forest is one of the most important vegetation types in the subalpine regions of western Sichuan,China,but our knowledge about the response of soil in this forest ecosystem,especially soil total soluble nitrogen to climate change is limited. The effects of elevated temperate( ET, ambient temperature +( 2. 5 ± 0. 5) ℃),CO-_2 concentration doubli...