Table 3.

The accumulated prediction accuracy of the distribution of Qinghai spruce forests (and non-forest vegetation) by considering the limiting factors.

	Actual spruce forest percentage	Elevation	Slope aspect	Soil thickness	Slope position
Unit number	29.2%	37.7%	65.5%	71.4%	74.6%
Unit area	31.9%	55.8%	71.5%	73.9%	76.2%