Water Yield Variation due to Forestry Change in the Head-Water Area of Heihe River Basin, Northwest China

Table 2

Ranges and values of the most sensitive parameters in SWAT model.

Parameters	Descriptions	Ranges	Values
CN2	SCS curve number	−20%~20%	+6.32%
Sol_k	Saturated hydrological conductivity	−20%–20%	+11.56%
Escno	Evaporation compensation factor	0~1.0	0.83
SFTMP	Snowfall temperature	−2.0~2.0°C	0.9°C
Sol_z	Depth from soil surface to bottom of layer	−20%–20%	+3.65%
Sol_Awc	Available soil water content	−20%–20%	−0.35%
GWQMN	Threshold depth of water in the shallow aquifer required for return flow to occur	0–500 mm	306.5
ALPHA_BF	Base flow alpha factor	0.00~1.00	0.07