Table 2 Geographical and climatic environment of the pastoral Naqu county and the agricultural Chanang county
|  | Population | Area (km2) | Altitude (m) | Annual mean temperature (℃) | Annual mean precipitation (mm) |
|---|---|---|---|---|---|
Naqu | 90,000 | 16,195 | 4,450 | -2.2 | 400 |
Chanang | 83,000 | 2,163 | 3,620 | 8.2 | 420 |