Abstract:The forest area in the southern part of Gansu Province lies in the valley lands of the Minshan Mountains, including the mountainous area of the upper and middle reaches of the Bailongjiang and the Touhe Rivers between 103°10′—104°40′E and 32°30′—34°50′N, namely the greater part or part of the counties of Diebu, Zhougu, Lintan, Zhuoni and Wenxian. The vegetation in this area should be regarded as a part of the deciduous broadleaf forest and Picea-Abies forest province in the valley of the Minshan Mountains, which belong to the zone of cold-temperate mountain coniferous forest subregion of cold-temperate moutain coniferous forest in the southeastern part of the Qing-Zang plateau.