New Approach for Evaluation of a Watershed Ecosystem Service for Avoiding Reservoir Sedimentation and Its Economic Value: A Case Study from Ertan Reservoir in Yalong River, China

Table 2

The average soil erosion, exporting sediment and sediment retention of different types of land cover in 2005.

Land cover types	Area (km^2)	Area percent (%)	Average actual soil erosion in a unit area [×10^2 t/(km^2⋅a)]	Average exporting sediment to reservoir in a unit area [t/(km^2⋅a)]	Average sediment retention in a unit area [t/(km^2⋅a)]
Farmland	7610.7	6.0	187.5	3475.4	6525.0
Forestland	48307.5	37.8	3.8	45.8	1705.7
Grassland	62238.5	48.7	8.9	138.3	940.2
Build-up	177.5	0.1	19.5	772.5	4499.5
Wasteland	9499.1	7.4	17.7	86.5	259.1