Table 3. Details of the computations used to determine the impact of land use and climate change on the changes in hydrological process in the 1980s in Heihe River Basin (HRB) and its sub-basin in Northwest China.

Variable	M1	M2	M3	M4	Residual
Water Yield (mm)	YM1	YM2	YM3	YM4
Modeling change (mm)		YM2–YM1	YM3–YM1	YM4–YM1	(YM4–YM1) − (YM2–YM1) − (YM3–YM1)
Contribution rate (%)		CRland 80s	CRclimate 80s	100%	CRresidual