The Ecological Security Pattern's Response to the Change of Woodland Landscape Patterns in Chengdu City

As an important part of the forest resources,the woodland is the basic carrier of forests,a key component of natural landscape and principal ecological land. With urban expansion,a large number of woodlands and wetlands have been exploited for other purposes,thus resulting in constant change of spatial distribution of the woodland landscape; this change has further caused great impact on the regional ecological security pattern and macro-ecological environment. The study of ecological security pattern's response to the change of woodland landscape patterns has shown that the woodland area was declining during 1985-2006 in Chengdu city; the entire forest landscapes tended to fragmentation and its shape became simpler. The analysis of woodland pattern changes in different ecological security levels has indicated that the woodland area in high security zone during each period is much larger,but the fragmentation level is low. The woodland area in low security zone is the smallest and the number of patches is the minimum. The changes of woodland area and patch number has a positive correlation with the ecological security situation. However,the shape complexity of woodland patch has no obvious correlation with the location in security zone.