From the Fig 3, we can see that vegetation fraction in the center
urban, where performed as the center, was lower than that in
suburb. During the 14years, the vegetation fraction was
highest in 1988 and lowest in 2002.
Table 2 shows the change ofvegetation fraction in the
multi-temporal. From 1988 to 1991, the average vegetation
fraction of the whole region has dropped, but the overall
downward trend is not very clear, only dropped 2.2%. The
vegetation fraction in the center urban decreased significantly
except the Dongxi Lakes. From 1991 to 1996 the vegetation
fraction was lightly increased inthe whole study area, rose
1.6%. From 1996 to 2002 is the period which vegetation
fraction decreased the most sharply in this period, dropped
7.4%.The average vegetation fraction of the whole area from
1988 to 2002 was decreased from 58.41% to 50.45%,
especially in Jiangxia district and the central district