Spatial-Temporal Characteristics and Driving Forces of Woodland Resource Change in Hainan Island in the Last 15 years
近15年海南岛林地资源时空动态特征及政策驱动

Hainan Island is the second largest island of China and it is a relatively detached area compared with the mainland.But from the foundation of Hainan province and Hainan special economy zone, the status of woodland resource, especially the forest, have taken great changes.So this article analyzed the spatial-temporal characteristics of woodland resource change in Hainan Island according to dynamic degree model and relative change rate model based on RS and GIS technology.The result showed that during the last 15 years from 1985 to 2000, the woodland resource have taken great changes and have different temporal characteristics: during the period from 1985 to 1995, the woodland area and forest area increased by (44953.1)hm~2 and (113445.68)hm~2 respectively; But During the latest 5 years from 1995 to 2000, the scope and depth of woodland resource changes exceeded that of previous period.Owing to lots of woodland turned into farmland and built-up area, the forest, bush and sparse wood area decreased greatly, especially the woodland area and forest area decreased by 28205.97 ha and 106847.21hm~2 respectively.In terms of spatial pattern, the woodland resource changes in distribution had extensive and unbalanced characteristics.From 1985 to 2000 the change rate in eastern and northeastern coastal plain area, such as Wenchang, Qionghai, Wanning, Lingsgui, Baoting is higher than that of other regions.The relative change rate of bush is higher than that of other woodland types.And the relative change rate of forest is prominent in Haikou, Wanning and Zhanzhou.During the previous period from 1985 to 1995, the highest relative change rate of forest, which equaled to 4.2, located in Zhanzhou county, but during the latest period from 1995 to 2000, the highest relative change rate of forest, which equaled to 6.37, located in Haikou county.According to the analysis on woodland transformation process, the author pointed out that the land-use structure change affected by socio-economic policies during 1985 to 2000 is the primary driving force that leading to the spatial-temporal change of woodland resource.