[1] Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Qinghai, Peoples R China
[2] Qinghai Univ, Coll Agr & Anim Husb, Xining 810016, Qinghai, Peoples R China
[3] Forest Seedling Stn Qinghai Prov, Xining 810000, Qinghai, Peoples R China
[4] Forestry & Grassland Bur Qinghai Prov, Xining 810000, Qinghai, Peoples R China
[5] Makehe Forestry Bur Qinghai Prov, Guoluo 814000, Qinghai, Peoples R China