In the primary nonresidential expenditure model, income, ethnicity, private or public lands, and forest lands had a significant effect on nonconsumptive wildlife recreation expenditures.
The area above Chashang Section in the Beishi River Valley, a tributary of Fen River, is made up of forested and unforested lands in one and the other.
In the case of the Tarim Basin, the area of Populus euphratica forests has shrunk quickly duo to the artificial factors such as reclamation and cutover forest and etc.
As a whole the variation trend was that the area of cultivated land, forest, town (city) was increased greatly, the water area was enlarged, but the grassland and badland was decreased.