Abstract:
Based on remote sensing data, meteorological data and statistical data of Yinchuan basin in 1993, 2000, 2007 and 2014, the correlation coefficient method were used to analyze the spatial and temporal distribution of land-use and land-cover change(LUCC) and ecological service. The study showed that the area of forest land and construction land were increased respectively by 19.92% and 58.81% during 1993—2014, while the area of grassland, water, farmland and other land decreased accordingly. The average annual growth rate of net primary productivity(NPP) was 2.1%. The average annual growth rate of the amount of water-retaining capacity was 1.95%, and it increased firstly and then decreased. The annual average value of the amount of wind-break and sand-fixing decreased steadily with the average annual growth rate of -2.09% and would decline in the further. Thanks to the increasing of unit production, the average annual growth rate of grain yield (GP) was 7.4%. NPP and the amount of water-retaining capacity present high value in the middle, but show low around.The amount of wind-break and sand-fixing increased gradually from south to north and from the southeast to the northwest.The regions with the high grain yield are mainly distributed in Pingluo county, Yongning county and Helan county, other regions have the relatively low value. NPP, wind-break and sand-fixing and water-retaining capacity showed cooperative relations.The wind-break and sand-fixing and water-retaining capacity show the tradeoff with GP,while NPP and GP show a cooperative relationship.
