Land Use Zoning for Conserving Ecosystem Services under the Impact of Climate Change: A Case Study in the Middle Reaches of the Heihe River Basin

Table 3

Land use changes during 1988–2008 (unit: km²).

Land use type	1988	1995	2000	2008	Change rate during 1988–2008 (%)
Cultivated land	4650	4290	4814	5194	11.70
Forestry	3509	3575	3538	3505	−0.11
Grassland	13382	13642	13186	13269	−0.84
Water area	739	1075	750	701	−5.14
Built-up area	390	365	419	466	19.49
Unused land	17718	17446	17686	17239	−2.70

Note: change rate during () 1988–2008 is calculated based on the following formula: ; represents the area of each type of land in 1988 and represents the area of each type of land in 2008.