[Comprehensive evaluation of soil quality of different land use types on the northeastern margin of the Qinghai-Tibet Plateau, China].

Soil quality evaluation is an important prerequisite for the rational soil resource utilization. We collected soil samples from forest (=9), grassland (=18) and cropland (=38) in Tianzhu County, Gansu Province, which is located on the northeastern edge of the Qinghai-Tibet Plateau. Soil quality was evaluated based on thirteen soil physical and chemical indicators, including soil bulk density, field capacity, and organic matter.