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which increase the number of landslides during downpours, were generated on hill
slopes during the Chi-Chi earthquake (Lin et al., 2006b). Statistical results illustrate
that the effects of disturbances on the watershed landscape in the study areas were
cumulative, but were not always evident in space and time over the entire landscape
(Lin et al., 2006b). The effects of the Chi-Chi earthquake on the landscapes of the
study areas gradually declined; this finding was also obtained by Chang et al. (2007).
However, in the Chenyulan watershed, as the landslide ratio increased with successive
rainstorms and strong earthquakes, the NDVI values decreased (Lin et al., 2008b).
Hence, subsequent rainstorms cause divergent destruction of vegetation; this destruc-
tion may be influenced by the precipitation distribution and typhoon path (Lin et al.,
2008b) (Table 1).
Figure 2.
NDVI images of area A on (a) 1996/11/08, (b) 1999/03/06, (c) 1999/10/31, (d) 2000/11/27,
(e) 2001/11/20, (f) 2003/12/17, and (g) 2004/11/19.
