GAP Analysis Of Biodiversity Conservation In Limestone Area Of Southwestern Guangxi

By using TM images of year 2001 and 2006 as the main data source, with the supporting of 3S techniques, the research analysised the landscape pattern of limestone area of southwestern guangxi, predicted the forest changes by CA model, applied the GAP analysis to identify the Gaps of the current reserve. Based on these analysis and combined with field survey and NDVI index, this paper ensured the high conservation value forests. Then,it discussed the reserve planning and biodiversity conservation of the research area. Subsquently, by analicizing these data, we draw several reliable and extremely meaningful conclusions and interesting findings as the following:(1)Overall, the forest area and patch numbers were still reducing. Therefore, the species habitat area was also shrinking. Compared to 2001, the landscape shape index of the forest in 2006 decreased, but its value was relatively large, and the shape was loose. Although the cohesion of forest was remain at a high level, but the fragmentation degree was relatively high. Seen from landscape diversity, the forest was still shrinking and divided, tended to decentralization and fragmentation. Indicated that the external interference was strong, seriously affected the ecological balance of species habitat.(2)Predicted the potential distribution of forest using cellular automata model, and identified the Gaps of current reserve; determined the high conservation value forests needed to be protected of research area by the NDVI index, the potential distribution of forests and the distribution of rare species. The results showed that the security level of the current pattern of protection is low.(3)Based on the current reserve, the construction of reserve selects the high conservation value forests for priority conservation, as far as possible expands the current reserve, selectively establishes the new reserve. Meanwhile, for the protection of biological diversity, should increase the investment, strengthens the training for reserve managers; Popularization the knowledge of biological diversity;Strengthens the poverty alleviation support of reserve and surrounding areas,to decrease the demand of fuelfood.